10-K

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 10-K

☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the fiscal year ended December 31, 2021.

OR

☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from __________ to __________.

Commission file number  001-13643

ONEOK, Inc.

(Exact name of registrant as specified in its charter)

Oklahoma	73-1520922
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)

100 West Fifth Street,	Tulsa,	OK	74103
(Address of principal executive offices)			(Zip Code)

Registrant’s telephone number, including area code   (918) 588-7000

Securities registered pursuant to Section 12(b) of the Act:

Title of each class	Trading Symbol(s)	Name of each exchange on which registered
Common stock, par value of $0.01	OKE	New York Stock Exchange

Securities registered pursuant to Section 12(g) of the Act:  None

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act. Yes ☒ No ☐.

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act. Yes ☐  No ☒.

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.  Yes ☒  No ☐

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§ 232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files).  Yes ☒ No ☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, smaller reporting company or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

Large accelerated filer ☒    Accelerated filer ☐    Non-accelerated filer ☐    Smaller reporting company ☐

Emerging growth company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Indicate by check mark whether the registrant has filed a report on and attestation to its management’s assessment of the effectiveness of its internal control over financial reporting under Section 404(b) of the Sarbanes-Oxley Act (15 U.S.C. 7262(b)) by the registered public accounting firm that prepared or issued its audit report. ☒

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Act). Yes ☐ No ☒.

Aggregate market value of registrant’s common stock held by non-affiliates based on the closing trade price on June 30, 2021, was $24.4 billion.

On February 22, 2022, the Company had 446,213,285 shares of common stock outstanding.

DOCUMENTS INCORPORATED BY REFERENCE:

Portions of the definitive proxy statement to be delivered to shareholders in connection with the Annual Meeting of Shareholders to be held May 25, 2022, are incorporated by reference in Part III.

Table of Contents

ONEOK, Inc.

2021 ANNUAL REPORT

Part I.		Page No.
Item 1.	Business	5
Item 1A.	Risk Factors	21
Item 1B.	Unresolved Staff Comments	34
Item 2.	Properties	35
Item 3.	Legal Proceedings	35
Item 4.	Mine Safety Disclosures	35
Part II.
Item 5.	Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities	35
Item 6.	[Reserved]	36
Item 7.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	37
Item 7A.	Quantitative and Qualitative Disclosures about Market Risk	51
Item 8.	Financial Statements and Supplementary Data	54
Item 9.	Changes in and Disagreements with Accountants on Accounting and Financial Disclosure	100
Item 9A.	Controls and Procedures	100
Item 9B.	Other Information	100
Item 9C.	Disclosure Regarding Foreign Jurisdictions that Prevent Inspections	100
Part III.
Item 10.	Directors, Executive Officers and Corporate Governance	101
Item 11.	Executive Compensation	101
Item 12.	Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters	101
Item 13.	Certain Relationships and Related Transactions, and Director Independence	102
Item 14.	Principal Accounting Fees and Services	102
Part IV.
Item 15.	Exhibits, Financial Statement Schedules	103
Item 16.	Form 10-K Summary	110
Signatures		111

As used in this Annual Report, references to “we,” “our,” or “us” refer to ONEOK, Inc., an Oklahoma corporation, and its predecessors and subsidiaries, unless the context indicates otherwise.

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GLOSSARY

The abbreviations, acronyms and industry terminology used in this Annual Report are defined as follows:

$1.5 Billion Term Loan Agreement	The senior unsecured delayed-draw three-year $1.5 billion term loan agreement dated November 19, 2018
$2.5 Billion Credit Agreement	ONEOK’s $2.5 billion revolving credit agreement, as amended
AFUDC	Allowance for funds used during construction
Annual Report	Annual Report on Form 10-K for the year ended December 31, 2021
ASU	Accounting Standards Update
Bbl	Barrels, 1 barrel is equivalent to 42 United States gallons
BBtu/d	Billion British thermal units per day
Bcf	Billion cubic feet
Bcf/d	Billion cubic feet per day
Btu	British thermal unit
CFTC	U.S. Commodity Futures Trading Commission
Clean Air Act	Federal Clean Air Act, as amended
Clean Water Act	Federal Water Pollution Control Act Amendments of 1972, as amended
COVID-19	Coronavirus disease 2019, including variants thereof
DJ	Denver-Julesburg
DOT	United States Department of Transportation
EBITDA	Earnings before interest expense, income taxes, depreciation and amortization
EPA	United States Environmental Protection Agency
EPS	Earnings per share of common stock
ESG	Environmental, social and governance
Exchange Act	Securities Exchange Act of 1934, as amended
FERC	Federal Energy Regulatory Commission
Fitch	Fitch Ratings, Inc.
GAAP	Accounting principles generally accepted in the United States of America
Guardian Pipeline	Guardian Pipeline, L.L.C., a wholly owned subsidiary of ONEOK, Inc.
GHG	Greenhouse gas
Homeland Security	United States Department of Homeland Security
ICE	Intercontinental Exchange
Intermediate Partnership	ONEOK Partners Intermediate Limited Partnership, a wholly owned subsidiary of ONEOK Partners, L.P.
KCC	Kansas Corporation Commission
LIBOR	London Interbank Offered Rate
MBbl/d	Thousand barrels per day
MDth/d	Thousand dekatherms per day
MMBbl	Million barrels
MMBbl/d	Million barrels per day
MMBtu	Million British thermal units
MMcf/d	Million cubic feet per day
Moody’s	Moody’s Investors Service, Inc.
Natural Gas Act	Natural Gas Act of 1938, as amended
Natural Gas Policy Act	Natural Gas Policy Act of 1978, as amended
NGL(s)	Natural gas liquid(s)
NGL products	Marketable natural gas liquid purity products, such as ethane, ethane/propane mix, propane, iso-butane, normal butane and natural gasoline
Northern Border Pipeline	Northern Border Pipeline Company, a 50% owned joint venture
NYMEX	New York Mercantile Exchange
NYSE	New York Stock Exchange
OCC	Oklahoma Corporation Commission
ONEOK	ONEOK, Inc.
ONEOK Partners	ONEOK Partners, L.P., a wholly owned subsidiary of ONEOK, Inc.

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OPIS	Oil Price Information Service
Overland Pass Pipeline	Overland Pass Pipeline Company, LLC, a 50% owned joint venture
PHMSA	United States Department of Transportation Pipeline and Hazardous Materials Safety Administration
POP	Percent of Proceeds
Quarterly Report(s)	Quarterly Report(s) on Form 10-Q
Roadrunner	Roadrunner Gas Transmission, LLC, a 50% owned joint venture
RRC	Railroad Commission of Texas
S&P	S&P Global Ratings
SCOOP	South Central Oklahoma Oil Province, an area in the Anadarko Basin in Oklahoma
SEC	Securities and Exchange Commission
Securities Act	Securities Act of 1933, as amended
Series E Preferred Stock	Series E Non-Voting, Perpetual Preferred Stock, par value $0.01 per share
SOFR	Secured Overnight Financing Rate
STACK	Sooner Trend Anadarko Canadian Kingfisher, an area in the Anadarko Basin in Oklahoma
WTI	West Texas Intermediate
XBRL	eXtensible Business Reporting Language

The statements in this Annual Report that are not historical information, including statements concerning plans and objectives of management for future operations, economic performance or related assumptions, are forward-looking statements. Forward-looking statements may include words such as “anticipate,” “believe,” “continue,” “could,” “estimate,” “expect,” “forecast,” “goal,” “target,” “guidance,” “intend,” “may,” “might,” “outlook,” “plan,” “potential,” “project,” “scheduled,” “should,” “will,” “would” and other words and terms of similar meaning. Although we believe that our expectations regarding future events are based on reasonable assumptions, we can give no assurance that such expectations or assumptions will be achieved. Important factors that could cause actual results to differ materially from those in the forward-looking statements are described under Part I, Item 1A, Risk Factors, and Part II, Item 7, Management’s Discussion and Analysis of Financial Condition and Results of Operations and “Forward-Looking Statements,” in this Annual Report.

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PART I

ITEM 1.    BUSINESS

GENERAL

We are incorporated under the laws of the state of Oklahoma, and our common stock is listed on the NYSE under the trading symbol “OKE.” We are a leading midstream service provider and own one of the nation’s premier NGL systems, connecting NGL supply in the Rocky Mountain, Permian and Mid-Continent regions with key market centers and own an extensive network of natural gas gathering, processing, storage and transportation assets. We apply our core capabilities of gathering, processing, fractionating, transporting, storing and marketing natural gas and NGLs through vertical integration across the midstream value chain to provide our customers with premium services while generating consistent and sustainable earnings growth.

Midstream Value Chain

	Legend
				We are connected to supply in natural gas and NGL producing basins and have significant basin diversification, including the Williston, Permian, Powder River and DJ Basins and the STACK and SCOOP areas. In our Natural Gas Gathering and Processing segment, we have more than 3 million dedicated acres in the Williston Basin and approximately 300,000 dedicated acres in the STACK and SCOOP areas. In our Natural Gas Liquids segment, we are the largest NGL takeaway provider in the Williston and Powder River Basins; Oklahoma, including the STACK and SCOOP areas; Kansas; and the Texas Panhandle. We also have a significant presence in the Permian Basin.
		Natural Gas Gathering & Processing
		Natural Gas Liquids
		Natural Gas Pipelines
Raw natural gas is typically gathered at the wellhead, compressed and transported through pipelines to our processing facilities. Most raw natural gas produced at the wellhead also contains a mixture of NGL components, including ethane, propane, iso-butane, normal butane and natural gasoline.
Gathered wellhead natural gas is directed to our processing plants to remove NGLs, resulting in residue natural gas (primarily methane).				Once processed, residue natural gas is recompressed and delivered to intrastate and interstate natural gas pipelines primarily in our Natural Gas Pipelines segment.
NGLs extracted at processing plants, both third-party and our own, are then gathered by our NGL gathering pipelines.
Gathered NGLs are directed to our downstream fractionators in the Mid-Continent region and Mont Belvieu, Texas, to be separated into purity products.
				Residue natural gas is transported to storage facilities and end users, such as large industrial customers, natural gas and electric utilities serving commercial and residential consumers, and international markets through liquefied natural gas exports and cross-border pipelines.
Purity products are stored or distributed to our customers, such as petrochemical companies, propane distributors, heating fuel users, ethanol producers, refineries and exporters.

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EXECUTIVE SUMMARY

Business Update and Market Conditions - We experienced earnings growth from increased volumes in 2021, compared with 2020, due primarily to increased producer activity and rising gas-to-oil ratios in the Rocky Mountain region, production curtailments in 2020, increased ethane production in the Rocky Mountain region and higher commodity prices, in both our Natural Gas Gathering and Processing and Natural Gas Liquids segments, highlighting both the resiliency of our integrated assets and the economic recovery from the pandemic. We expect volumes to increase in 2022 due to continued increases in producer activity, continued rising gas-to-oil ratios in the Rocky Mountain region, the recent completion of our Bear Creek plant expansion and increased ethane demand from the petrochemical industry.

Although the energy industry has experienced many up and down cycles, we have positioned ourselves to reduce exposure to direct commodity price volatility. Each of our three segments are primarily fee-based, and our consolidated earnings were approximately 90% fee-based in 2021. While our Natural Gas Gathering and Processing segment’s earnings are primarily fee-based, we have direct commodity price exposure related primarily to fee with POP contracts. In our Natural Gas Liquids segment, we are primarily exposed to commodity price risk resulting from the relative values of the various NGL products to each other, the value of NGLs in storage and the relative value of NGLs to natural gas. In addition, our Natural Gas Gathering and Processing and Natural Gas Liquids segments are exposed to volumetric risk as a result of drilling and completion activity, normal volumetric well decline, severe weather disruption, operational outages and crude oil, NGL and natural gas demand. Our Natural Gas Pipelines segment is not exposed to significant volumetric risk due to nearly all of our capacity being subscribed under long-term firm fee-based contracts.

In the first quarter 2021, Winter Storm Uri brought significant challenges to the energy industry and our operating areas. Our employees were proactive in preparing for the severe winter weather, made the necessary adjustments to keep our assets operational and provided exceptional service to meet the needs of our customers during the difficult weather conditions. Increased demand for natural gas, propane and electricity, coupled with supply reductions from producer wellhead freeze-offs and power outages impacting processing plants in the Mid-Continent and Rocky Mountain regions and the Permian Basin and fractionators in the Mid-Continent region, resulted in high commodity prices at certain market hubs, particularly in the Mid-Continent region and in Texas. Commodity prices quickly returned to previous levels as the weather improved and natural gas supply returned.

Winter Storm Uri impacted all three of our operating segments, resulting in a net positive impact to our financial results, primarily in the first quarter 2021, as our ability to meet increased demand for natural gas and to provide services during the period offset the unfavorable volume impacts and higher electricity costs. Our well-positioned natural gas storage assets and market connected pipelines in our Natural Gas Pipelines segment were able to meet critical needs during this period of severe winter weather. The reliability of our interstate and intrastate assets, including storage, enabled us to continue to provide our customers access to transportation services, park-and-loan services and additional natural gas supply, if available, which improved our financial results. However, this was partially offset by producer wellhead freeze-offs, which reduced February volumes in our Natural Gas Gathering and Processing and Natural Gas Liquids segments.

As we continue to monitor the COVID-19 pandemic, we remain committed to managing the impact of the pandemic on our employees. We continue to protect our workforce and, as always, we remain focused on operating our assets safely, reliably and in an environmentally responsible manner. ONEOK is a critical infrastructure business as defined by Homeland Security and, therefore, our workforce has remained fully engaged within federal, state and local government issued guidelines and safety-related ordinances. We began implementing our return to office plan in early 2022, and we will continue to take safety precautions for our employees who work in the field or report to a ONEOK facility. We continue to apply risk-management and cybersecurity measures designed so that our systems remain functional in order to both serve our operational needs and to provide service to our customers.

See Part II, Item 7A, Quantitative and Qualitative Disclosures About Market Risk, in this Annual Report for more information on our exposure to market risk.

Sustainability and Social Responsibility - In 2021 and 2022, we qualified for inclusion in the S&P Global Sustainability Yearbook. In addition, we received a perfect score of 100 in the Human Rights Campaign 2021 Corporate Equality Index, were upgraded from A to AA at MSCI Inc. ESG ratings, were named a Top 100 U.S. Companies Supporting Healthy Communities and Families, were listed as one of America’s Most Responsible Companies for 2022 by Newsweek and were ranked in the top 10% in the Refiners and Pipelines industry group in Sustainalytics ESG Risk Ranking. We continue to look for ways to reduce our environmental impact and utilize more efficient technologies. We have an environmental sustainability team that accelerated our ongoing environmental stewardship efforts and is exploring ways to lower our GHG emissions even further. We are dedicated to the evaluation and development of renewable energy and low-carbon projects and are actively

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researching opportunities that will complement our extensive midstream assets and expertise, strengthening the role we expect to play in the transformation to a lower-carbon economy.

In September 2021, we announced a 30% absolute GHG emissions reduction target, or 2.2 million metric tons, of our combined Scope 1 and Scope 2 emissions by 2030, compared with 2019 base-year levels. Scope 1 and 2 emissions represent our total operational emissions, including direct emissions from sources we operate and indirect emissions from the generation of purchased power. We anticipate several potential pathways toward achieving our emissions reduction target, which could include the electrification of certain natural gas compression assets across our operations, methane mitigation through best management practices and system optimizations. Additionally, we are identifying potential opportunities to collaborate with utilities and power generators to accelerate the availability of lower-carbon power options across our operations. We will maintain a disciplined capital approach and will continue to discuss our total capital expenditures and provide our expected total capital spend annually in the “Liquidity and Capital Resources” section in Part II, Item 7, Management’s Discussion and Analysis of Financial Condition and Results of Operations, in this, and future, Annual Reports.

Natural Gas - In our Natural Gas Gathering and Processing segment, gathered and processed volumes in the Rocky Mountain region increased in 2021, compared with 2020, due primarily to increased producer activity, rising gas-to-oil ratios and the impact of curtailed production in 2020. In November 2021, we announced the completion of our Bear Creek plant expansion, which increased our total processing capacity to approximately 1.7 Bcf/d in the Williston Basin. In addition, as we expect to continue to benefit from increased producer activity and continued rising gas-to-oil ratios in the Rocky Mountain region, we recently announced plans to restart construction on our 200 MMcf/d Demicks Lake III natural gas processing plant. Upon completion of Demicks Lake III, which is expected in the first quarter 2023, our total processing capacity will be approximately 1.9 Bcf/d in the Williston Basin. In the Mid-Continent region, we are experiencing increased producer drilling activity in 2022 in the SCOOP and STACK areas.

In our Natural Gas Pipelines segment, our assets are connected to key supply areas and demand centers, including export markets in Mexico via Roadrunner and supply areas in Canada and the United States via our interstate and intrastate natural gas pipelines and Northern Border Pipeline, which enable us to provide essential natural gas transportation and storage services. Continued demand from local distribution companies, electric-generation facilities and large industrial companies resulted in low-cost expansions that position us well to provide additional services to our customers when needed. Our ability to provide reliable service throughout the extreme weather conditions of Winter Storm Uri highlighted the importance of market-connected pipelines and storage assets and the value of these services. In addition, during the first quarter 2021, we sold natural gas that we owned and held in storage, which benefited our segment’s financial results. We continue to monitor market conditions and sell our natural gas in storage during favorable market conditions. During the extreme winter weather periods, we maximized natural gas storage withdrawals for firm service customers serving critical needs.

NGLs - In our Natural Gas Liquids segment, NGL volumes increased in 2021, compared with 2020, due primarily to increased production in the Rocky Mountain region, Mid-Continent region and Permian Basin, increased ethane production in the Rocky Mountain region and the impact of curtailed production across our system in 2020, offset partially by the impact of Winter Storm Uri in 2021 and lower volumes in the Barnett Shale. In response to increased producer activity and the expected increased demand for ethane as two new petrochemical plants come online in 2022, we recently announced plans to restart construction on our 125 MBbl/d MB-5 fractionator in Mont Belvieu, Texas, which is fully contracted. MB-5 is expected to be completed in the third quarter 2023 and will increase our NGL fractionation capacity to more than 1 MMBbl/d across our entire system.

See Part II, Item 7, Management’s Discussion and Analysis of Financial Condition and Results of Operations, in this Annual Report for more information on our growth projects, results of operations, liquidity and capital resources.

BUSINESS STRATEGY

Our mission is to deliver energy products and services vital to an advancing world. Our vision is to create exceptional value for our stakeholders by providing solutions for a transforming energy future. Our business strategy is focused on:

•Zero incidents - we commit to a zero-incident culture for the well-being of our employees, contractors and communities. Safety and environmental responsibility continue to be a primary focus for us, and our emphasis on personal and process safety has produced improving trends in the key indicators we track.

•Highly engaged workforce - we strive to be an employer of choice and continue to focus on attracting, selecting and retaining talent, advancing an inclusive, diverse and engaged culture and developing individuals and leaders.

•Sustainable business model - we aim to maintain prudent financial strength and flexibility while operating a safe, reliable and resilient asset base. We seek to maintain investment-grade credit ratings and a strong balance sheet. We

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believe our internally generated cash flows will allow us to fund capital-growth projects in our existing operating regions and to provide value-added products and services that contribute to long-term growth, profitability and business diversification. We continue to actively research opportunities that will complement our extensive midstream assets and expertise, strengthening the role we expect to play in the transformation to a lower-carbon economy.

•Maximizing total shareholder return - we plan to grow earnings and sustain our dividend by efficiently allocating capital to investments that produce returns above our cost of capital. Producing consistent and strong returns on invested capital will allow us to not only reward our shareholders, but also provide the means and opportunity to serve our additional stakeholders, including employees, communities and the environment.

NARRATIVE DESCRIPTION OF BUSINESS

We report operations in the following business segments:

•Natural Gas Gathering and Processing;

•Natural Gas Liquids; and

•Natural Gas Pipelines.

Natural Gas Gathering and Processing

Overview - Our Natural Gas Gathering and Processing segment provides midstream services to producers in North Dakota, Montana, Wyoming, Kansas and Oklahoma.

Rocky Mountain region - The Williston Basin is located in portions of North Dakota and Montana and includes the oil-producing, NGL-rich Bakken Shale and Three Forks formations. Our recently completed Bear Creek plant expansion increased our gathering and processing total capacity to approximately 1.7 Bcf/d and will enable us to capture expected natural gas production from new wells.

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The Powder River Basin is primarily located in Wyoming, which includes the NGL-rich Niobrara Shale and Frontier, Turner and Sussex formations where we provide gathering and processing services to customers in the eastern portion of Wyoming.

Mid-Continent region - The Mid-Continent region includes the oil-producing, NGL-rich STACK and SCOOP areas and the Cana-Woodford Shale, Woodford Shale, Springer Shale, Meramec, Granite Wash and Mississippian Lime formations of Oklahoma and Kansas, and the Hugoton Basin.

Property - Our Natural Gas Gathering and Processing segment includes the following assets:

•17,500 miles of natural gas gathering pipelines;

•13 natural gas processing plants with 1.7 Bcf/d of processing capacity in the Rocky Mountain region, and nine natural gas processing plants with 0.9 Bcf/d of processing capacity in the Mid-Continent region, and up to 150 MMcf/d of processing capacity in the Mid-Continent region through a long-term processing services agreement with an unaffiliated third party; and

•14 MBbl/d of NGL fractionation capacity and 26 MBbl/d of de-ethanizer capacity at various natural gas processing plants.

We are in the process of constructing our 200 MMcf/d Demicks Lake III natural gas processing plant in the Williston Basin, which is not included in the assets listed above.

See “Recent Developments” in Part II, Item 7, Management’s Discussion and Analysis of Financial Condition and Results of Operations, in this Annual Report for more information on our growth projects.

Sources of Earnings - Earnings for this segment are derived primarily from the following types of service contracts:

•Fee with POP contracts with no producer take-in-kind rights - We purchase raw natural gas and charge contractual fees for providing midstream services, which include gathering, treating, compressing and processing the producer’s natural gas. After performing these services, we sell the commodities and remit a portion of the commodity sales proceeds to the producer less our contractual fees.

•Fee with POP contracts with producer take-in-kind rights - We purchase a portion of the raw natural gas stream, charge fees for providing the midstream services listed above, return primarily the residue natural gas to the producer, sell the remaining commodities and remit a portion of the commodity sales proceeds to the producer less our contractual fees.

•Fee-only - Under this type of contract, we charge a fee for the midstream services we provide, based on volumes gathered, processed, treated and/or compressed.

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For commodity sales, we contract to deliver residue natural gas, condensate and/or unfractionated NGLs to downstream customers at a specified delivery point. Our sales of NGLs are primarily to our affiliate in the Natural Gas Liquids segment.

Utilization - The utilization rates for our natural gas processing plants were 69% and 66% for 2021 and 2020, respectively, which includes 81% and 70% in the Rocky Mountain region for 2021 and 2020, respectively. Our utilization rates in the Rocky Mountain region increased in 2021 due primarily to increased producer activity, rising gas-to-oil ratios and the impact of curtailed production in 2020. Our 2021 utilization rates include the impact of capacity made available by our Demicks Lake II processing plant and Bear Creek plant expansion. We calculate utilization rates using a weighted-average approach, adjusting for the dates that assets were placed in or removed from service.

Unconsolidated Affiliates - Our unconsolidated affiliates in this segment are not material.

See Note M of the Notes to Consolidated Financial Statements in this Annual Report for additional discussion of our unconsolidated affiliates.

Government Regulation - The FERC traditionally has maintained that a natural gas processing plant is not a facility for the transportation or sale of natural gas in interstate commerce and, therefore, is not subject to jurisdiction under the Natural Gas Act. Although the FERC has made no specific declaration as to the jurisdictional status of our natural gas processing operations or facilities, our natural gas processing plants are primarily involved in extracting NGLs and, therefore, are exempt from FERC jurisdiction. The Natural Gas Act also exempts natural gas gathering facilities from the jurisdiction of the FERC. We believe our natural gas gathering facilities upstream of our natural gas processing plants meet the criteria used by the FERC for nonjurisdictional natural gas gathering facility status. Interstate transmission facilities remain subject to FERC jurisdiction. The FERC has historically distinguished between these two types of facilities, either interstate or intrastate, on a fact-specific basis. We transport residue natural gas from certain of our natural gas processing plants to interstate pipelines in accordance with Section 311(a) of the Natural Gas Policy Act. Oklahoma, Kansas, Wyoming, Montana and North Dakota also have statutes regulating, to varying degrees, the gathering of natural gas in those states. In each state, regulation is applied on a case-by-case basis if a complaint is filed against the gatherer with the appropriate state regulatory agency.

See further discussion in the “Regulatory, Environmental and Safety Matters” section.

Natural Gas Liquids

Overview - Our Natural Gas Liquids segment owns and operates facilities that gather, fractionate, treat and distribute NGLs and store NGL products, primarily in Oklahoma, Kansas, Texas, New Mexico and the Rocky Mountain region, which includes the Williston, Powder River and DJ Basins. We provide midstream services to producers of NGLs and deliver those products to the two primary market centers: one in the Mid-Continent in Conway, Kansas, and the other in the Gulf Coast in Mont Belvieu, Texas. We own or have an ownership interest in FERC-regulated NGL gathering and distribution pipelines in Oklahoma, Kansas, Texas, New Mexico, Montana, North Dakota, Wyoming and Colorado, and terminal and storage facilities in Kansas, Missouri, Nebraska, Iowa and Illinois. We have a 50% ownership interest in Overland Pass Pipeline Company, which operates an interstate NGL pipeline originating in Wyoming and Colorado and terminating in Kansas. The majority of the pipeline-connected natural gas processing plants in the Williston Basin, Oklahoma, Kansas and the Texas Panhandle are connected to our NGL gathering systems. We lease rail cars and own and operate truck- and rail-loading and -unloading facilities connected to our NGL fractionation, storage and pipeline assets. We also own FERC-regulated NGL distribution pipelines in Kansas, Missouri, Nebraska, Iowa, Illinois and Indiana that connect our Mid-Continent assets with Midwest markets, including Chicago, Illinois. A portion of our ONEOK North System transports refined petroleum products, including unleaded gasoline and diesel, from Kansas to Iowa.

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Property - Our Natural Gas Liquids segment includes the following assets:

•9,120 miles of gathering pipelines with operating capacity of 1,790 MBbl/d, including 6,330 miles of FERC-regulated pipelines with operating capacity of 1,490 MBbl/d;

•4,350 miles of distribution pipelines with operating capacity of 1,150 MBbl/d, including 4,180 miles of FERC-regulated pipelines with operating capacity of 1,080 MBbl/d;

•eight NGL fractionators with combined operating capacity of 920 MBbl/d (includes interests in our proportional share of operating capacity), including 520 MBbl/d in the Mid-Continent region and 400 MBbl/d in the Gulf Coast region;

•one isomerization unit with operating capacity of 10 MBbl/d;

•one ethane/propane splitter with operating capacity of 40 MBbl/d;

•six NGL storage facilities with operating storage capacity of 30 MMBbl; and

•eight NGL product terminals.

In addition, we lease 10 MMBbl of annual pipeline capacity near our ONEOK North System and have access to 5 MMBbl of combined NGL storage capacity at facilities in Kansas and Texas and 60 MBbl/d of NGL fractionation capacity in the Gulf Coast through service agreements.

We are in the process of constructing our 125 MBbl/d MB-5 NGL fractionator in Mont Belvieu, Texas, which is not included in the assets listed above.

See “Recent Developments” in Part II, Item 7, Management’s Discussion and Analysis of Financial Condition and Results of Operations, in this Annual Report for more information on our growth projects.

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Sources of Earnings - Earnings for our Natural Gas Liquids segment are derived primarily from commodity sales and purchases and fee-based services. We purchase NGLs and condensate from third parties, as well as from our Natural Gas Gathering and Processing segment. Our business activities are categorized as follows:

•Exchange services - We utilize our assets to gather, transport, treat and fractionate unfractionated NGLs, thereby converting them into marketable NGL products delivered to a market center or customer-designated location. Some of these exchange volumes are under contracts with minimum volume commitments that provide a minimum level of revenues regardless of volumetric throughput. Our exchange services activities are primarily fee-based and include some rate-regulated tariffs; however, we also capture certain product price differentials through the fractionation process.

•Transportation and storage services - We transport NGL products and refined petroleum products, primarily under FERC-regulated tariffs. Tariffs specify the maximum rates we may charge our customers and the general terms and conditions for transportation service on our pipelines. Our storage activities consist primarily of fee-based NGL storage services at our Mid-Continent and Gulf Coast storage facilities.

•Optimization and marketing - We utilize our assets, contract portfolio and market knowledge to capture location, product and seasonal price differentials through the purchase and sale of unfractionated NGLs and NGL products. We primarily transport NGL products between Conway, Kansas, and Mont Belvieu, Texas, to capture the location price differentials between the two market centers. Our marketing activities also include utilizing our NGL storage facilities to capture seasonal price differentials and serving truck and rail markets. Our isomerization activities capture the price differential when normal butane is converted into the more valuable iso-butane at our isomerization unit in Conway, Kansas.

In the majority of our exchange services contracts, we purchase the unfractionated NGLs at the tailgate of the processing plant and deduct contractual fees related to the transportation and fractionation services we must perform before we can sell them as NGL products. To the extent we hold unfractionated NGLs in inventory, the related contractual fees will not be recognized until the unfractionated inventory is fractionated and sold.

Utilization - Increased volumes drove higher utilization rates at our NGL fractionators, which were offset by the full year impact of increased capacity on our NGL gathering pipelines. The utilization rates for 2021 and 2020, respectively, were as follows:

•our NGL gathering pipelines were 61% and 61%;

•our NGL distribution pipelines were 51% and 51%; and

•our NGL fractionators were 91% and 77%.

We calculate utilization rates using a weighted-average approach, adjusting for the dates that assets were placed in service. Our fractionation utilization rate reflects approximate proportional capacity associated with our ownership interests.

Unconsolidated Affiliates - We have a 50% ownership interest in Overland Pass Pipeline Company, which operates an interstate NGL pipeline system extending 760 miles, originating in Wyoming and Colorado and terminating in Kansas. Our other unconsolidated affiliates in this segment are not material.

See Note M of the Notes to Consolidated Financial Statements in this Annual Report for additional discussion of unconsolidated affiliates.

Government Regulation - The operations and revenues of our NGL pipelines are regulated by various state and federal government agencies. Our interstate NGL pipelines are regulated under the Interstate Commerce Act, which gives the FERC jurisdiction to regulate the terms and conditions of service, rates, including depreciation and amortization policies, and initiation of service. In Oklahoma, Kansas and Texas, certain aspects of our intrastate NGL pipelines that provide common carrier service are subject to the jurisdiction of the OCC, KCC and RRC, respectively.

See further discussion in the “Regulatory, Environmental and Safety Matters” section.

Natural Gas Pipelines

Overview - Our Natural Gas Pipelines segment, through its wholly owned assets, provides transportation and storage services to end users. We have 50% ownership interests in Northern Border Pipeline and Roadrunner, which provide transportation services to various end users.

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Interstate Pipelines - Our interstate pipelines are regulated by the FERC and are located in North Dakota, Minnesota, Wisconsin, Illinois, Indiana, Kentucky, Tennessee, Oklahoma, Texas and New Mexico. Our interstate pipeline companies include:

•Midwestern Gas Transmission, which is a bidirectional system that interconnects with Tennessee Gas Transmission Company’s pipeline near Portland, Tennessee, and with several interstate pipelines that have access to both the Utica Shale and the Marcellus Shale at the Chicago Hub near Joliet, Illinois;

•Viking Gas Transmission, which is a bidirectional system that interconnects with a TC Energy Corporation pipeline at the United States border near Emerson, Canada, and ANR Pipeline Company near Marshfield, Wisconsin;

•Guardian Pipeline, which interconnects with several pipelines at the Chicago Hub near Joliet, Illinois, and with local natural gas distribution and electric generation companies in Wisconsin; and

•OkTex Pipeline, which has interconnections with several pipelines in Oklahoma, Texas and New Mexico.

Intrastate Pipelines and Storage - Our intrastate natural gas pipeline assets in Oklahoma transport natural gas throughout the state and have access to the major natural gas production areas in the Mid-Continent region, which include the STACK and SCOOP areas and the Cana-Woodford Shale, Woodford Shale, Springer Shale, Meramec, Granite Wash and Mississippian Lime formations. In Texas, our intrastate natural gas pipelines are connected to the major natural gas producing formations in the Texas Panhandle, including the Granite Wash formation and Delaware and Midland Basins in the Permian Basin. These pipelines are capable of transporting natural gas throughout the western portion of Texas, including the Waha area where other pipelines may be accessed for transportation to western markets, exports to Mexico, the Houston Ship Channel market to the east and the Mid-Continent market to the north. Our intrastate natural gas pipeline assets also have access to the Hugoton and Central Kansas Uplift Basins in Kansas. Our intrastate pipelines are also connected to our storage assets in Oklahoma and Texas.

Property - Our Natural Gas Pipelines segment includes the following assets:

•1,500 miles of FERC-regulated interstate natural gas pipelines with 3.5 Bcf/d of transportation capacity;

•5,100 miles of state-regulated intrastate transmission pipelines with transportation capacity of 4.3 Bcf/d; and

•six underground natural gas storage facilities with 52.2 Bcf of total active working natural gas storage capacity.

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Our storage includes two underground natural gas storage facilities in Oklahoma, two underground natural gas storage facilities in Kansas and two underground natural gas storage facilities in Texas.

We are in the process of expanding the capacity of our Texas natural gas storage facilities by 1.1 Bcf, which is not included in the assets listed above.

Sources of Earnings - Earnings in this segment are derived primarily from transportation and storage services.

Our transportation earnings are primarily fee-based from the following types of services:

•Firm service - Customers reserve a fixed quantity of pipeline capacity for a specified period of time, which obligates the customer to pay regardless of usage. Under this type of contract, the customer pays a monthly fixed fee and incremental fees, known as commodity charges, which are based on the actual volumes of natural gas they transport or store. Under the firm service contract, the customer generally is guaranteed access to the capacity they reserve.

•Interruptible service - Under interruptible service transportation agreements, the customer may utilize available capacity after firm service requests are satisfied. The customer is not guaranteed use of our pipelines unless excess capacity is available.

Our regulated natural gas transportation services contracts are based upon rates stated in the respective tariffs, which have generally been established through shipper specific negotiation, discounts and negotiated settlements. The rates are filed with FERC or the appropriate state jurisdictional agencies. In addition, customers typically are assessed fees, such as a commodity charge, and we may retain a percentage of natural gas in-kind based on the natural gas volumes transported.

Our storage earnings are primarily fee-based from the following types of services:

•Firm service - Customers reserve a specific quantity of storage capacity, including injection and withdrawal rights, and generally pay fixed fees based on the quantity of capacity reserved plus an injection and withdrawal fee. Firm storage contracts typically have terms longer than one year.

•Park-and-loan service - An interruptible storage service offered to customers providing the ability to park (inject) or loan (withdraw) natural gas into or out of our storage, typically for monthly or seasonal terms. Customers reserve the right to park or loan natural gas based on a specified quantity, including injection and withdrawal rights when capacity is available.

Utilization - Our natural gas pipelines were 95% and 96% subscribed in 2021 and 2020, respectively, and our natural gas storage facilities were 70% and 71% subscribed in 2021 and 2020, respectively.

Unconsolidated Affiliates - Our Natural Gas Pipelines segment includes the following unconsolidated affiliates:

•50% ownership interest in Northern Border Pipeline, which owns a FERC-regulated interstate pipeline that transports natural gas from the Montana-Saskatchewan border near Port of Morgan, Montana, and the Williston Basin in North Dakota to a terminus near North Hayden, Indiana.

•50% ownership interest in Roadrunner, a bidirectional pipeline, which has the capacity to transport 570 MMcf/d of natural gas from the Permian Basin in West Texas to the Mexican border near El Paso, Texas, and has capacity to transport approximately 1.0 Bcf/d of natural gas from the Delaware Basin to the Waha area. We are the operator of Roadrunner.

See Note M of the Notes to Consolidated Financial Statements in this Annual Report for additional discussion of unconsolidated affiliates.

Government Regulation - Interstate - Our interstate natural gas pipelines are regulated under the Natural Gas Act, which gives the FERC jurisdiction to regulate virtually all aspects of this business, such as transportation of natural gas, rates and charges for services, construction of new facilities, depreciation and amortization policies, acquisition and disposition of facilities, and the initiation and discontinuation of services.

Intrastate - Our intrastate natural gas pipelines in Oklahoma, Kansas and Texas are regulated by the OCC, KCC and RRC, respectively, and by the FERC under the Natural Gas Policy Act for certain services where we deliver natural gas into FERC regulated natural gas pipelines. While we have flexibility in establishing natural gas transportation rates with customers, there is a maximum rate that we can charge our customers in Oklahoma and Kansas and for the services regulated by the FERC. In Texas and Kansas, natural gas storage may be regulated by the state and by the FERC for certain types of services. In

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Oklahoma, natural gas storage operations are not subject to rate regulation by the state, and we have market-based rate authority from the FERC for certain types of services.

See further discussion in the “Regulatory, Environmental and Safety Matters” section.

Market Conditions and Seasonality

Supply and Demand - Supply for each of our segments depends on crude oil and natural gas drilling and production activities, which are driven by the strength of the economy; natural gas, crude oil and NGL prices; the demand for each of these products from end users; the decline rate of existing production; producer access to capital and investment in the industry; or producer firm commitments to transportation pipelines.

Demand for gathering and processing services is dependent on natural gas production by producers in the regions in which we operate. Producers’ targets to limit natural gas flaring have increased the need for our services to capture, gather and process natural gas. Demand for NGLs and the ability of natural gas processors to successfully and economically sustain their operations affect the volume of unfractionated NGLs produced by natural gas processing plants, thereby affecting the demand for NGL gathering, transportation and fractionation services. Natural gas and NGL products are affected by economic conditions and the demand associated with the various industries that utilize the commodities, such as butanes and natural gasoline used by the refining industry as blending stocks for motor fuel, denaturant for ethanol and diluents for crude oil. Ethane, propane, butanes and natural gasoline are also used by the petrochemical industry to produce chemical components, used for a range of products that improve our daily lives and promote economic growth, including health care products, recyclable food packaging, clothing, technology, building materials, industrial, manufacturing and energy infrastructure, lightweight vehicle components and batteries. Propane is also used to heat homes and businesses.

Commodity Prices - Our earnings are primarily fee-based in all three of our segments, however in our Natural Gas Gathering and Processing segment, we are exposed to commodity price risk as a result of retaining a portion of the commodity sales proceeds associated with our fee with POP contracts. Under certain fee with POP contracts, our contractual fees and POP percentage may increase or decrease if production volumes, delivery pressures or commodity prices change relative to specified thresholds. In certain commodity price environments, our contractual fees on these fee with POP contracts may decrease, which would impact the average fee rate in our Natural Gas Gathering and Processing segment. In our Natural Gas Liquids segment, we are exposed to commodity price risk associated with changes in the price of NGLs; the location differential between the Mid-Continent, Chicago, Illinois, and Gulf Coast regions; and the relative price differential between natural gas, NGLs and individual NGL products, which affect our NGL purchases and sales, our exchange services, transportation and storage services, and optimization and marketing financial results. NGL storage revenue may be affected by price volatility and forward pricing of NGL physical contracts versus the price of NGLs on the spot market. In our Natural Gas Pipelines segment, we are exposed to minimal commodity price risk associated with (i) changes in the price of natural gas, which impact our fuel costs and retained fuel in-kind received for our services; and (ii) the differential between forward pricing of natural gas physical contracts and the price of natural gas on the spot market, which may affect our customer demand for our natural gas storage services.

See additional discussion regarding our commodity price risk and related hedging activities under “Commodity Price Risk” in Part II, Item 7A, Quantitative and Qualitative Disclosures about Market Risk, in this Annual Report.

Seasonality - Cold temperatures usually increase demand for natural gas and certain NGL products, such as propane, which are heating fuels for homes and businesses. Warm temperatures usually increase demand for natural gas used in gas-fired electric generation for residential and commercial cooling, as well as agriculture-related equipment like irrigation pumps and crop dryers. Demand for butanes and natural gasoline, which are primarily used by the refining industry as blending stocks for motor fuel, denaturant for ethanol and diluents for crude oil, are also subject to some variability during seasonal periods when certain government restrictions on motor fuel blending products change. During periods of peak demand for a certain commodity, prices for that product typically increase.

Extreme weather conditions, seasonal temperature changes and the impact of temperature and humidity on the mechanical abilities of the processing equipment impact the volumes of natural gas gathered and processed and NGL volumes gathered, transported and fractionated. Power interruptions and inaccessible well sites as a result of severe storms or freeze-offs, a phenomenon where water produced from natural gas freezes at the wellhead or within the gathering system, may cause a temporary interruption in the flow of natural gas and NGLs.

In our Natural Gas Pipelines segment, natural gas storage is necessary to balance the relatively steady natural gas supply with the seasonal demand of residential, commercial and electric-generation users.

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Competition - We compete for natural gas and NGL supply with other midstream companies, major integrated oil companies and independent exploration and production companies that have gathering and processing assets, fractionators, intrastate and interstate pipelines and storage facilities. The factors that typically affect our ability to compete for natural gas and NGL supply are:

•quality of services provided;

•producer drilling activity;

•proceeds remitted and/or fees charged under our contracts;

•proximity of our assets to natural gas and NGL supply areas and markets;

•proximity of our assets to alternative energy production;

•location of our assets relative to those of our competitors;

•efficiency and reliability of our operations;

•receipt and delivery capabilities for natural gas and NGLs that exist in each pipeline system, plant, fractionator and storage location;

•the petrochemical industry’s level of capacity utilization and feedstock requirements;

•current and forward natural gas and NGL prices; and

•cost of and access to capital.

We have remained competitive by making capital investments to access and connect new supplies with end-user demand; increasing gathering, processing, fractionation and pipeline capacity; increasing storage, withdrawal and injection capabilities; and improving operating efficiency so that we compete effectively. Our and our competitors’ infrastructure projects may affect commodity prices and could displace supply volumes from the Mid-Continent and Rocky Mountain regions and the Permian Basin where our assets are located. We believe our assets are located strategically, connecting diverse supply areas to market centers.

Customers - Our Natural Gas Gathering and Processing and Natural Gas Liquids segments derive services revenue from major and independent crude oil and natural gas producers. Our Natural Gas Liquids segment’s customers also include other NGL and natural gas gathering and processing companies. Our downstream commodity sales customers are primarily petrochemical, refining and marketing companies, utilities, large industrial companies, natural gasoline distributors, propane distributors and municipalities. Our Natural Gas Pipeline segment’s assets primarily serve local natural gas distribution companies, electric-generation facilities, large industrial companies, municipalities, producers, processors and marketing companies. Our utility customers generally require our services regardless of commodity prices. See discussion regarding our customer credit risk under “Counterparty Credit Risk” in Part II, Item 7A, Quantitative and Qualitative Disclosures about Market Risk, in this Annual Report.

Other

Through ONEOK Leasing Company, L.L.C. and ONEOK Parking Company, L.L.C., we own a 17-story office building (ONEOK Plaza) and a parking garage in downtown Tulsa, Oklahoma, where our headquarters are located. ONEOK Leasing Company, L.L.C. leases excess office space to others and operates our headquarters office building. ONEOK Parking Company, L.L.C. owns and operates a parking garage adjacent to our headquarters.

REGULATORY, ENVIRONMENTAL AND SAFETY MATTERS

Environmental Matters - We are subject to a variety of historical preservation and environmental laws and/or regulations that affect many aspects of our present and future operations. Regulated activities include, but are not limited to, those involving air emissions, storm water and wastewater discharges, handling and disposal of solid and hazardous wastes, wetlands and waterways preservation, wildlife conservation, cultural resources protection, hazardous materials transportation, and pipeline and facility construction. These laws and regulations require us to obtain and/or comply with a wide variety of environmental clearances, registrations, licenses, permits and other approvals. Failure to comply with these laws, regulations, licenses and permits may expose us to fines, penalties, reputational harm and/or interruptions in our operations that could be material to our results of operations or financial condition. In addition, emissions controls and/or other regulatory or permitting mandates under the Clean Air Act and other similar federal and state laws could require unexpected capital expenditures at our facilities. We cannot assure that existing environmental statutes and regulations will not be revised or that new regulations will not be adopted or become applicable to us. We also cannot assure that existing permits will not be revised or cancelled, potentially impacting facility construction activities or ongoing operations.

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International, federal, regional and/or state legislative and/or regulatory initiatives may attempt to control or limit GHG emissions, including initiatives directed at issues associated with climate change. Various federal and state legislative proposals have been introduced to regulate the emission of GHGs, particularly carbon dioxide and methane, and the United States Supreme Court has ruled that carbon dioxide is a pollutant subject to regulation by the EPA. In addition, there have been international efforts seeking legally binding reductions in emissions of GHGs.

Recently, the EPA has proposed updating the New Source Performance Standards Subpart OOOO regulations to further reduce methane emissions, which includes increased monitoring frequency and more stringent repair requirements for new and modified oil and gas facilities. In addition, the EPA is proposing new nationwide emission guidelines for states to limit methane emissions from existing facilities.

PHMSA has submitted to the Federal Register an advisory bulletin underscoring to pipeline and pipeline facility operators requirements to minimize methane emissions in the Protecting our Infrastructure of Pipelines and Enhancing Safety (PIPES) Act of 2020. The PIPES Act directs pipeline operators to update their inspection and maintenance plans to address the elimination of hazardous leaks, and to minimize natural gas releases from pipeline facilities. The updated plans must also address the replacement or remediation at facilities that historically have been known to experience leaks.

In September 2021, we announced a 30% absolute GHG emissions reduction target, or 2.2 million metric tons, of our combined Scope 1 and Scope 2 emissions by 2030, compared with 2019 base-year levels. Scope 1 and 2 emissions represent our total operational emissions, including direct emissions from sources we operate and indirect emissions from the generation of purchased power. We anticipate several potential pathways toward achieving our emissions reduction target, which could include the electrification of certain natural gas compression assets across our operations, methane mitigation through best management practices and system optimizations. Additionally, we are identifying potential opportunities to collaborate with utilities and power generators to accelerate the availability of lower-carbon power options across our operations.

We participate in the EPA’s Natural Gas STAR Program and the Our Nation’s Energy (ONE) Future Coalition to voluntarily report methane emission reductions and to calculate our methane intensity. We continue to focus on maintaining low methane gas release rates through expanded implementation of best practices to limit the release of natural gas during pipeline and facility maintenance and operations.

We believe it is likely that future governmental legislation and/or regulation on the federal, state or regional level may require us to limit GHG emissions associated with our operations, pay additional taxes or purchase allowances for certain emissions. However, we cannot predict precisely what form these future regulations will take, the stringency of the regulations, when they will become effective or the impact on our capital expenditures, competitive position and results of operations. In addition to activities on the federal level, state and regional initiatives could also lead to the regulation of GHG emissions sooner than or independent of federal regulation. These regulations could be more stringent than any federal legislation that may be adopted.

For additional information regarding the potential impact of laws and regulations on our operations see Item 1A “Risk Factors.”

Pipeline Safety - We are subject to PHMSA safety regulations, including pipeline asset integrity-management regulations. The Pipeline Safety Improvement Act of 2002 requires pipeline companies operating high-pressure pipelines to perform integrity assessments on pipeline segments that pass through densely populated areas or near specifically designated high-consequence areas (HCAs). The Pipeline Safety, Regulatory Certainty and Job Creation Act of 2011 (the 2011 Pipeline Safety Act) increased maximum penalties for violating federal pipeline safety regulations, directs the DOT and Secretary of Transportation to conduct further review or studies on issues that may or may not be material to us and may result in the imposition of more stringent regulations.

In 2015, PHMSA issued notices of proposed rule-making for hazardous liquid pipeline safety regulations, natural gas transmission and gathering lines and underground natural gas storage facilities. For natural gas and natural gas gathering pipelines, the new proposed regulations became known as “the Mega Rule.” Due to the large number of rules being considered, PHMSA partitioned the new rule-making into three sections. The first section of rules was finalized and published in 2019 in the Federal Register and became effective in July 2020. These final rules mostly address congressional mandates due to former pipeline safety reauthorizations and established criteria for verifying current operating pressures. The second section of the PHMSA Gas Mega Rule, which is still not currently published, focuses on repair requirements for HCAs and non-HCAs. The third section of the Mega Rule established new regulations for certain gas gathering lines, which were formerly unregulated, and was published in November 2021 and will become effective in May 2022.

We do not anticipate the potential capital and operating expenditures related to the first and third sections of the rules to create a material impact to our planned capital or operations and maintenance costs. At this point, we do not fully know the impact of

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the regulations that remain to be finalized. Coupled together, these new rules may provide increased requirements for operating and maintenance, integrity management, public awareness and civil/criminal penalties; however, we do not anticipate a material impact to our planned capital or operations and maintenance costs resulting from compliance with the new or pending regulations.

In 2020, legislation was passed to reauthorize PHMSA through 2024. Certain requirements for operations and maintenance, integrity management, leak detection and public awareness will be subject to future rule-making as a result. The potential capital and operating expenditures related to the new regulations are not fully known, but we do not anticipate a material impact to our planned capital or operations and maintenance costs resulting from compliance with the new regulations.

Air and Water Emissions - The Clean Air Act, the Clean Water Act, analogous state laws and/or regulations impose restrictions and controls regarding the discharge of pollutants into the air and water in the United States. Under the Clean Air Act, a federally enforceable operating permit is required for sources of significant air emissions. We may be required to incur certain capital expenditures for air pollution-control equipment in connection with obtaining or maintaining permits and approvals for sources of air emissions. The Clean Water Act imposes substantial potential liability for pollutants discharged into waters of the United States and requires remediation of waters affected by such discharge.

International, federal, regional and/or state legislative and/or regulatory initiatives may attempt to control or limit GHG emissions, including initiatives directed at issues associated with climate change. We monitor all relevant legislation and regulatory initiatives to assess the potential impact on our operations and otherwise take efforts to limit GHG emissions from our facilities, including methane. The EPA’s Mandatory Greenhouse Gas Reporting Rule requires annual GHG emissions reporting from affected facilities and the carbon dioxide emission equivalents for all NGLs produced by us as if all of these products were combusted, even if they are used otherwise.

Our 2020 total estimated GHG emissions were 66.7 million metric tons of carbon dioxide equivalents, which includes 3.8 million metric tons of Scope 1 emissions and 2.5 million metric tons of Scope 2 emissions. Scope 1 emissions originate from the combustion of fuel in our equipment, such as compressor engines and heaters, as well as fugitive methane emissions, Scope 2 emissions are generated from purchased power sources and Scope 3 emissions reflect the carbon dioxide emissions that would result from the complete combustion or oxidation of the annual quantity of NGL products produced and sold or delivered to others. The additional cost to gather and report this emission data did not have, and we do not expect it to have, a material impact on our results of operations, financial position or cash flows. In addition, Congress has considered, and may consider in the future, legislation to reduce GHG emissions, including carbon dioxide and methane. Likewise, the EPA may institute additional future regulatory rule-making associated with GHG emissions from the oil and natural gas industry. At this time, no rule or legislation has been enacted that assesses any material costs, fees or expenses on any of these emissions.

We monitor proposed and final rule-makings. Generally, EPA rule-makings require expenditures for updated emissions controls, monitoring and recordkeeping requirements at affected facilities. At this time, we do not anticipate a material impact to our planned capital, operations and maintenance costs resulting from compliance with the current or pending regulations and EPA actions. However, the EPA may issue additional regulations, responses, amendments and/or policy guidance, which could alter our present expectations.

Chemical Site Security - Homeland Security released the Chemical Facility Anti-Terrorism Standards in 2007, and the final rule associated with these regulations was issued in December 2014. We provided information regarding our chemicals via Top-Screens submitted to Homeland Security, and our facilities subsequently were assigned one of four risk-based tiers ranging from high (Tier 1) to low (Tier 4) risk, or not tiered at all due to low risk. To date, one of our facilities has been given a Tier 4 rating. Facilities receiving a Tier 4 rating are required to complete Site Security Plans, including possible physical security enhancements. The cost of the Site Security Plans and security enhancements did not have a material impact on our results of operations, financial position or cash flows.

Pipeline Security - Homeland Security’s Transportation Security Administration (TSA) and the DOT have completed a review and inspection of our “critical facilities” and identified no material security issues. Also, the TSA has released new pipeline security guidelines that include broader definitions for the determination of pipeline “critical facilities.” We have reviewed our pipeline facilities according to the new guideline requirements, and there have been no material changes required to date.

The TSA issued two security directives in 2021 in response to ongoing cybersecurity threats to the pipeline industry. The first security directive was issued in May 2021 and requires critical pipeline owners and operators to (1) report confirmed and potential cybersecurity incidents to the Cybersecurity and Infrastructure Security Agency (CISA); (2) designate a cybersecurity coordinator to be available 24 hours a day, seven days a week; (3) review current practices; and, (4) identify any gaps and related remediation measures to address cyber-related risks and report the results to TSA and CISA within 30 days. The second

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security directive was issued in July 2021 and requires owners and operators of TSA-designated critical pipelines to implement specific mitigation measures to protect against ransomware and other known threats to information technology and operational technology systems, develop and implement a cybersecurity contingency and recovery plan, and conduct a cybersecurity architecture design review. While compliance with the security directives is utilizing significant internal and external resources, we do not expect it to have a material impact on our results of operations, financial position or cash flows.

HUMAN CAPITAL

The long-term sustainability of our business is dependent on our continued ability to maintain a highly engaged workforce. To accomplish this, our business strategy includes attracting, selecting and retaining talent, advancing an inclusive, diverse and engaged culture and developing individuals and leaders.

As of December 31, 2021, we had 2,847 employees. Listed below is a summary of our human capital resources, measures and objectives that are collectively important to our success as an organization.

Values - Our success relies on the skills, experience and dedication of our employees. We are committed to cultivating an inclusive and dynamic work environment where talented people can find opportunities to succeed, grow and contribute to the success of the company. Our employees work each day to provide safe and reliable services to a wide range of customers in the states where we operate. Our core values, listed below, guide the way in which our employees conduct our business and operations.

•Safety & Environmental: we commit to a zero-incident culture for the well-being of our employees, contractors and communities and to operate in an environmentally responsible manner.

•Ethics: we act with honesty, integrity and adherence to the highest standards of personal and professional conduct.

•Diversity & Inclusion: we respect the uniqueness and worth of each employee and believe that a diverse, inclusive workforce is essential for a sense of belonging, engagement and performance.

•Excellence: we hold ourselves and others accountable to a standard of excellence through continuous improvement and teamwork.

•Service: we invest our time, effort and resources to serve each other, our customers and communities.

•Innovation: we seek to develop creative solutions by leveraging collaboration through ingenuity and technology.

Diversity and Inclusion - Our diversity and inclusion (D&I) strategy is a cross-functional effort that draws upon contributions from employees at all levels of the organization and is focused on enhancing the workplace to retain and attract talent. The strategy is guided by a D&I Council composed of a diverse group of employees who represent different demographics, work locations, points of view, roles and levels of seniority. We also have a team within our human resources department that is wholly dedicated to supporting our D&I efforts.

In 2021, we provided funding and support for five employee-led business resource groups (BRGs): a Black/African American Resource Group; an Indigenous/Native American Resource Group; a Latinx/Hispanic American Resource Group; a Veterans Resource Group; and a Women’s Resource Group. A new LGBTQ+ (Lesbian, Gay, Bisexual, Transgender, Queer and others) BRG has been approved for 2022. Each BRG’s purpose is to promote the attraction, development, motivation and retention of members of traditionally underrepresented groups in our industry and workplace in an effort to drive positive business outcomes. A key factor in the success of our BRGs is the active participation by officer-level executive sponsors and allies from outside the BRG’s underrepresented populations. All employees are invited to become a supporter of one or more of our BRGs.

We embed D&I concepts into our core leadership development curriculum and sponsor a number of internal programs intended to promote D&I. In addition, we seek to give back to the communities where we operate by partnering on initiatives to support underrepresented community members and local charitable organizations.

Employee Safety - The safety of our employees is critical to our operations and success. By promoting the safety of our employees, monitoring and investing in the integrity of our assets, we are enhancing the long-term sustainability of our businesses. We continuously assess the risks our employees face in their jobs, and we work to mitigate those risks through training, appropriate engineering controls, work procedures and other preventive safety programs. Reducing incidents and improving our personal safety incident rates are important, but we are not focused only on statistics. Low personal safety incident rates alone cannot prevent a large-scale incident, which is why we continue to focus on enhancing our Environmental, Safety and Health management systems and process safety programs, such as key risk/key control identification and knowledge sharing. We endeavor to operate our assets safely, reliably and in an environmentally responsible manner. We maintain mature and robust programs that guide trained staff in the completion of these activities, and we continue to enhance and improve these

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programs and our internal capabilities. With respect to COVID-19, we began implementing our return to office plan in early 2022, and we will continue to take safety precautions for our employees who work in the field or report to a ONEOK facility, such as increased facility access restrictions, workspace modifications, social distancing, face covering protocols and sanitation procedures.

Health and Welfare - We provide a variety of benefits to help promote the health and welfare of our employees and their families. These benefits include medical, dental and vision plans, virtual health visits and engagement of third-party service providers to offer company on-site and near-site clinics in several of our operating areas, which have access to both rapid antigen and polymerase chain reaction COVID-19 testing. In response to COVID-19, we provided temporary benefit adjustments, including waiving charges for COVID-19 diagnostic tests and COVID-19 vaccines. Current resources include a dedicated employee information site that houses regular updates regarding COVID-19 and provides resources for prevention best practices, physical health, mental health and caregiver services. Eligible employees also have access, at no charge, to an employee assistance program, a medical second opinion service and a health care concierge service to assist with finding in-network providers and resolving claims. We offer full pay for maternity, paternity or adoption leave of up to 240 hours per qualifying event. We also provide up to $10,000 for reasonable and necessary expenses of a qualifying adoption and/or surrogacy. Additional benefits provided for the welfare of our employees include, among others, life insurance and long-term disability plans, health and dependent care flexible spending accounts, fertility benefits, disease prevention and management programs and full pay while on bereavement or personal and family care leave.

We also provide the opportunity for our employees to help fellow employees through the ONE Trust Fund by contributing donated vacation hours or monetary donations. The ONE Trust Fund is a nonprofit, charitable organization run entirely by employee volunteers, that serves our employees in times of personal crises due to natural disasters, medical emergencies or other hardships.

Personal and Professional Development - We provide various options to assist with career growth and development. For employees just entering the workforce who desire to advance their career and continue to learn or for the professional who is interested in developing their skills, we provide education and training in a variety of areas, including leadership, functional and industry-specific topics, professional development and skill-building opportunities. Our organizational development and D&I teams provide live in-person and virtual classroom training, computer-based self-study and one-on-one coaching that is available to all employees.

We value education and assist eligible employees with the expense of furthering their education in job-related fields, including up to $5,000 per year in qualifying tuition expenses. We also may reimburse employees for certain job-related professional certification examination fees.

Recruiting - We make it a priority to attract, select, develop, motivate, challenge and retain the talent necessary to support our key business strategies. We use targeted recruitment events, maintain strong relationships with area technical schools, colleges and universities, and we offer compensation benefits and career opportunities that are designed to position us as an employer of choice. In response to COVID-19, we continue to recruit and hire new employees for critical positions primarily through virtual interviews. D&I continues to be a priority in recruiting, and we deploy sourcing strategies designed to access talent from groups that are historically underrepresented in our industry and workplace.

Retirement - We maintain a 401(k) Plan for our employees and match 100% of employee contributions up to 6% of eligible compensation each payroll period, subject to applicable tax limits. We also have a defined benefit pension plan covering certain employees and former employees, which closed to new participants in 2005. Employees that do not participate in our defined benefit pension plan are eligible to receive quarterly and annual profit-sharing contributions under our 401(k) Plan. As of December 31, 2021, 96% of eligible employees were contributing to our 401(k) Plan. For additional information about our retirement benefits, see Note K of the Notes to Consolidated Financial Statements in this Annual Report.

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INFORMATION ABOUT OUR EXECUTIVE OFFICERS

All executive officers are elected annually by our Board of Directors. Our executive officers listed below include the officers who have been designated by our Board of Directors as our Section 16 executive officers.

Name and Position	Age	Business Experience in Past Five Years
John W. Gibson	69	2011 to present	Chairman of the Board, ONEOK
Chairman of the Board		2007 to 2017	Chairman of the Board, ONEOK Partners
Pierce H. Norton II	62	2021 to present	President and Chief Executive Officer, ONEOK
President and Chief Executive Officer		2021 to present	Member of the Board of Directors, ONEOK
		2014 to 2021	President and Chief Executive Officer, ONE Gas, Inc.
		2014 to 2021	Member of the Board of Directors, ONE Gas, Inc.
Robert F. Martinovich	64	2015 to present	Executive Vice President and Chief Administrative Officer, ONEOK
Executive Vice President and Chief Administrative Officer		2015 to 2017	Executive Vice President and Chief Administrative Officer, ONEOK Partners
Walter S. Hulse III	58	2019 to present	Chief Financial Officer, Treasurer and Executive Vice President, Strategy and Corporate Affairs, ONEOK
Chief Financial Officer, Treasurer and Executive Vice President, Strategy and Corporate Affairs		2017 to 2019	Chief Financial Officer and Executive Vice President, Strategic Planning and Corporate Affairs, ONEOK
		2015 to 2017	Executive Vice President, Strategic Planning and Corporate Affairs, ONEOK and ONEOK Partners
Kevin L. Burdick	57	2017 to present	Executive Vice President and Chief Operating Officer, ONEOK
Executive Vice President and Chief Operating Officer		2017	Executive Vice President and Chief Commercial Officer, ONEOK and ONEOK Partners
		2016 to 2017	Senior Vice President, Natural Gas Gathering and Processing, ONEOK Partners
Charles M. Kelley	63	2018 to present	Senior Vice President, Natural Gas, ONEOK
Senior Vice President, Natural Gas		2017 to 2018	Senior Vice President, Natural Gas Gathering & Processing, ONEOK
		2015 to 2017	Senior Vice President, Corporate Planning and Development, ONEOK and ONEOK Partners
Sheridan C. Swords	52	2017 to present	Senior Vice President, Natural Gas Liquids, ONEOK
Senior Vice President, Natural Gas Liquids		2013 to 2017	Senior Vice President, Natural Gas Liquids, ONEOK Partners
Stephen B. Allen	48	2017 to present	Senior Vice President, General Counsel and Assistant Secretary, ONEOK
Senior Vice President, General Counsel and Assistant Secretary		2008 to 2017	Vice President and Associate General Counsel, ONEOK and ONEOK Partners
Mary M. Spears	42	2019 to present	Vice President and Chief Accounting Officer, ONEOK
Vice President and Chief Accounting Officer		2015 to 2019	Director, SEC Reporting, ONEOK
		2015 to 2017	Director, SEC Reporting, ONEOK Partners

No family relationships exist between any of the executive officers, nor is there any arrangement or understanding between any executive officer and any other person pursuant to which the officer was selected.

INFORMATION AVAILABLE ON OUR WEBSITE

We make available, free of charge, on our website (www.oneok.com) copies of our Annual Reports, Quarterly Reports, Current Reports on Form 8-K, amendments to those reports filed or furnished to the SEC pursuant to Section 13(a) or 15(d) of the Exchange Act and reports of holdings of our securities filed by our officers and directors under Section 16 of the Exchange Act as soon as reasonably practicable after filing such material electronically or otherwise furnishing it to the SEC. Copies of our Code of Business Conduct and Ethics, Corporate Governance Guidelines, Director Independence Guidelines, Corporate Sustainability Report, Response to COVID-19 and the written charters of our Board Committees also are available on our website, and we will provide copies of these documents upon request.

In addition to our filings with the SEC and materials posted on our website, we also use social media platforms as additional channels of distribution to reach public investors. Information contained on our website, posted on our social media accounts, and any corresponding applications, are not incorporated by reference into this report.

ITEM 1A.    RISK FACTORS

Our investors should consider the following risks that could affect us and our business. Although we have tried to identify key factors, our investors need to be aware that other risks may prove to be important in the future. New risks may emerge at any time, and we cannot predict such risks or estimate the extent to which they may affect our financial performance. Investors should consider carefully the following discussion of risks and the other information included or incorporated by reference in this Annual Report, including “Forward-Looking Statements,” which are included in Part II, Item 7, Management’s Discussion and Analysis of Financial Condition and Results of Operations.

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RISK FACTORS RELATED TO OUR BUSINESS AND INDUSTRY

The COVID-19 pandemic has affected adversely, and could further affect adversely, our results of operations.

The COVID-19 pandemic led to global and regional economic disruption, volatility in the financial markets and a weakened commodity price environment. The outbreak and government measures taken in response, including extended quarantines, closures and reduced operations of businesses had a significant adverse impact, both direct and indirect, on our business and the economy.

Uncertainty remains regarding the duration of global impacts due to COVID-19. This uncertainty, and the occurrence of these events and measures taken in response, could further affect adversely our results of operations by, among other things, reducing demand for the services we provide, impacting our supply chains and the availability and efficiency of our workforce, creating operational challenges and impacting our ability to access capital markets. The degree to which the pandemic further impacts our business and results of operations will depend on future developments beyond our control, including the success of vaccination efforts and the effectiveness of such vaccines against future mutations of the COVID-19 virus, how quickly and to what extent economic and operating conditions resume to pre-COVID-19 levels, and the severity and duration of reduced global and regional economic activity resulting from the pandemic.

If the level of drilling in the regions in which we operate declines substantially near our assets, our volumes and revenues could decline.

Our gathering and transportation pipeline systems are dependent upon production from natural gas and crude oil wells, which naturally declines over time. As a result, our cash flows associated with these wells will also decline over time. In order to maintain or increase throughput levels on our gathering and transportation pipeline systems and the asset utilization rates at our processing and fractionation facilities, we must continually obtain new supplies. Our ability to maintain or expand our businesses depends largely on the level of drilling and production by third parties in the regions in which we operate. Our natural gas and NGL supply volumes may be impacted if producers curtail or redirect drilling and production activities. Drilling and production are impacted by factors beyond our control, including:

•demand and prices for natural gas, NGLs and crude oil;

•producers’ access to capital;

•producers’ finding and development costs of reserves;

•producers’ desire and ability to obtain necessary permits, drilling rights and surface access in a timely manner and on reasonable terms;

•crude oil and associated natural gas field characteristics and production performance; and

•capacity constraints and/or shut downs on the pipelines that transport crude oil, natural gas and NGLs from producing areas and our facilities.

Commodity prices have experienced significant volatility. Drilling and production activity levels may vary across our geographic areas; however, a prolonged period of low commodity prices may reduce drilling and production activities across all areas. If we are not able to obtain new supplies to replace the natural decline in volumes from existing wells or because of competition, throughput on our gathering and transportation pipeline systems and the utilization rates of our processing and fractionation facilities would decline, which could affect adversely our business, results of operations, financial position and cash flows, and our ability to pay cash dividends.

Our operating results may be affected adversely by unfavorable economic and market conditions.

In addition to impacts from the COVID-19 pandemic, an adverse change in economic conditions worldwide or in the economic regions in which we operate could negatively affect the crude oil and natural gas markets, as well as in the specific segments in which we operate, resulting in reduced demand and increased price competition for our services and products. Our operating results in one or more geographic regions may also be affected by uncertain or changing economic conditions within that region. Volatility in commodity prices may have an impact on many of our suppliers and customers, which, in turn, could have a negative impact on their ability to meet their obligations to us. Periods of severe volatility in equity and credit markets may disrupt our access to such markets, make it difficult to obtain financing necessary to expand facilities or acquire assets, increase financing costs and result in the imposition of restrictive financial covenants. If adverse global or regional economic and market conditions remain uncertain or persist, spread or deteriorate further, we may experience material impacts on our business, results of operations, financial position, cash flows and liquidity.

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The volatility of natural gas, crude oil and NGL prices could affect adversely our earnings and cash flows.

Lower commodity prices could reduce crude oil, natural gas and NGL production which could decrease the demand for our services. Additionally, a significant portion of our revenues are derived from the sale of commodities that are received in conjunction with natural gas gathering and processing services, the transportation and storage of natural gas, and from the purchase and sale of NGLs and NGL products. As commodity prices decline, we could be paid less for our commodities thereby reducing our cash flows. Historically, commodity prices have been volatile and can change quickly. For example, in March 2020, unsuccessful negotiations between the Organization of the Petroleum Exporting Countries (OPEC) and Russia regarding crude oil production cuts resulted in a price war between Saudi Arabia and Russia. As a result, the global supply of crude oil significantly exceeded demand and led to a collapse in crude oil prices. It is likely that commodity prices will continue to be volatile in the future.

The prices we receive for our commodities are subject to wide fluctuations in response to a variety of factors beyond our control, including, but not limited to, the following:

•overall domestic and global economic conditions;

•relatively minor changes in the supply of, and demand for, domestic and foreign energy;

•market uncertainty;

•geopolitical conditions impacting supply and demand for natural gas, NGLs and crude oil;

•production decisions by other countries, such as the failure of countries to abide by recent agreements to reduce production volumes;

•the availability and cost of third-party transportation, natural gas processing and fractionation capacity;

•the level of consumer product demand and storage inventory levels;

•ethane rejection;

•weather conditions;

•domestic and foreign governmental regulations and taxes;

•the price and availability of alternative fuels;

•speculation in the commodity futures markets;

•the effects of imports and exports on the price of natural gas, crude oil, NGL and liquefied natural gas;

•the effect of worldwide energy-conservation measures;

•the impact of new supplies, new pipelines, processing and fractionation facilities on location price differentials; and

•technology and improved efficiency impacting supply and demand for natural gas, NGLs and crude oil.

These external factors and the volatile nature of the energy markets make it difficult to reliably estimate future prices of commodities and the impact commodity price fluctuations have on our customers and their need for our services, which could affect adversely our business, results of operations, financial position and cash flows.

Increasing attention to ESG matters, including climate change, may impact our business.

There are increasing expectations that companies across all industries address ESG matters, including climate change. Changes in regulatory policies, public sentiment or widespread adoption of technologies that aim to address climate change through reducing GHG emissions may result in a reduction in the demand for hydrocarbon products, restrictions on their use or increased use of renewable energy. These changes could reduce the demand for our services, impacting our business, results of operations, financial position and cash flows.

In addition, increasing attention to climate change has resulted in an increased likelihood of governmental regulations, investigations, shareholder activism and private litigation, which could increase our costs or otherwise affect adversely our business. For example, there are plans to propose new climate change disclosure requirements this year. While we do not know what form those requirements may take, we may face increased costs associated with complying with any new climate disclosure requirements.

Certain investors are increasingly focused on ESG matters, including climate change. Further, organizations that provide information to investors on corporate governance and related matters have also increased their focus on ESG matters and have developed ratings processes for evaluating companies on various ESG initiatives. Unfavorable ESG ratings may lead to increased negative investor sentiment toward us. Due to climate change concerns, some investors may choose to either not invest, or to reduce their investment, in companies that gather, process, fractionate, transport, store or market products derived from hydrocarbons. If this negative investor sentiment increases, we may see reduced demand for our securities, which could impact our liquidity or the value of our securities. Additionally, certain large institutional lenders have begun to announce their own policies to meet publicly announced climate commitments, which often involve commitments to shift lending activities in

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the energy sector to meet GHG emissions goals. As a result, certain institutional lenders may impose additional requirements on us, or decide not to lend to us, based on ESG concerns, which could adversely affect our access to capital on reasonable terms or at all and, as a result, our financial condition. To the extent financial markets view climate change and emissions of GHGs as a financial risk, this could also negatively affect our ability to access capital or cause us to receive less favorable terms and conditions in future financings.

In September 2021, we announced a 30% absolute GHG reduction target, or 2.2 million metric tons, of our combined Scope 1 and Scope 2 emissions by 2030, compared with 2019 base-year levels. To the extent that the potential pathways we have identified to achieve this emissions reduction target are not available to us, or to the extent we otherwise are unable to make progress toward other ESG-related targets we may establish, we may face additional costs to meet these targets, or we may fail to meet them entirely, which could negatively impact our business and reputation.

We may be subject to physical and financial risks associated with climate change.

The threat of global climate change may create physical and financial risks to our business. Some of our customers’ energy needs vary with weather conditions, primarily temperature. For residential customers, heating and cooling represent their largest energy use. To the extent weather conditions may be affected by climate change, customers’ energy use could increase or decrease depending on the duration and magnitude of any changes. Increased energy use due to weather changes may require us to invest in more pipelines and other infrastructure to serve increased demand. A decrease in energy use due to weather changes may affect our financial condition, through decreased revenues. Extreme weather conditions in general require more system backup, adding to costs, and can contribute to increased system stresses, including service interruptions. Weather conditions outside of our operating territory could also have an impact on our revenues. Severe weather impacts our operating territories primarily through hurricanes, thunderstorms, tornados, freezing temperatures and snow or ice storms. To the extent the severity or frequency of extreme weather events increases, this could increase our cost of providing services, including the cost of insurance, and decrease the availability of certain insurance coverages. We may not be able to pass on the higher costs to our customers or recover all costs related to mitigating these physical risks.

Our operations are subject to operational hazards and unforeseen interruptions, which could affect adversely our business and for which we may not be adequately insured.

Our operations are subject to all the risks and hazards typically associated with the operation of natural gas and NGL gathering, transportation and distribution pipelines, storage facilities and processing and fractionation facilities, which include, but are not limited to, leaks, pipeline ruptures, the breakdown or failure of equipment or processes and the performance of facilities below expected levels of capacity and efficiency. Other operational hazards and unforeseen interruptions include adverse weather conditions, infectious disease including a pandemic, cybersecurity attacks, geopolitical reactions, accidents, explosions, fires, the collision of equipment with our pipeline facilities (for example, this may occur if a third party were to perform excavation or construction work near our facilities) and catastrophic events such as tornados, hurricanes, earthquakes, floods, and other similar events beyond our control. Extreme cold weather can result in supply reductions from producer wellhead freeze-offs, as well as power curtailments or outages, any of which can negatively impact our business, results of operations, financial position and cash flows. Further, the United States government warned that energy assets, specifically the nation’s pipeline infrastructure, may be targets of terrorist attacks. An act of terrorism could target our facilities, those of our suppliers or customers or those of other pipelines. A casualty occurrence may result in injury or loss of life, extensive property damage or environmental damage. Liabilities incurred and interruptions to the operations of our pipeline or other facilities caused by such an event could reduce our revenues and increase expenses, thereby impairing our ability to meet our obligations.

As a result of market conditions, premiums and deductibles for certain insurance policies can increase substantially, and, in some instances, certain insurance may become unavailable or available only for reduced amounts of coverage. Consequently, we may not be able to renew existing insurance policies or purchase other desirable insurance on commercially reasonable terms, if at all. Insurance proceeds may not be adequate to cover all liabilities or expenses incurred or revenues lost, and we are not fully insured against all risks inherent to our business. If we were to incur a significant liability for which we were not fully insured, it could affect adversely our business, results of operations, financial position and cash flows. Further, the proceeds of any such insurance may not be paid in a timely manner.

Continued development of supply sources outside of our operating regions could impact demand for our services.

Production areas outside of our operating regions may compete with natural gas and NGL supply originating in production areas connected to our systems, which may cause natural gas and NGLs in supply areas connected to our systems to be diverted to markets other than our traditional market areas and may affect capacity utilization adversely on our pipeline systems and our ability to renew or replace existing contracts. In our Natural Gas Gathering and Processing segment, the development of

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reserves could move drilling rigs from our current service areas to other areas, which may reduce demand for our services. In our Natural Gas Pipelines segment, the displacement of natural gas originating in supply areas connected to our pipeline systems by supply sources that are closer to the end-use markets could reduce demand for our services. Either of these possibilities could result in lower revenues, which could affect adversely our business, results of operations, financial position and cash flows.

We do not hedge fully against commodity price risk or interest rate risk, including commodity price changes, seasonal price differentials, product price differentials or location price differentials. This could result in decreased revenues, increased costs and lower margins, affecting adversely our results of operations.

Certain of our businesses are exposed to market risk and the impact of market fluctuations in natural gas, NGLs and crude oil prices. Market risk refers to the risk of loss of future cash flows and earnings arising from adverse changes in commodity prices. Our primary commodity price exposures arise from:

•the value of the commodities sold under fee with POP contracts of which we retain a portion of the sales proceeds;

•the price differentials between the individual NGL products with respect to our NGL transportation and fractionation agreements;

•the location price differentials in the price of natural gas and NGLs;

•the seasonal price differentials in natural gas and NGLs related to our storage operations;

•the price risk related to electric costs to operate our facilities; and

•the fuel costs and the value of the retained fuel in-kind in our natural gas pipelines and storage operations.

To manage the risk from market price fluctuations in natural gas, NGLs, crude oil and electricity prices, we may use derivative instruments such as swaps, futures, forwards and options. However, we do not hedge fully against commodity price changes, and we therefore retain some exposure to market risk. Further, hedging instruments that are used to reduce our exposure to interest-rate fluctuations could expose us to risk of financial loss where we may contract for fixed-rate swap instruments to hedge variable-rate instruments and the fixed rate exceeds the variable rate. Finally, hedging arrangements for forecasted sales and purchases are used to reduce our exposure to commodity price fluctuations and may limit the benefit we would otherwise receive if market prices for natural gas, crude oil and NGLs differ from the stated price in the hedge instrument for these commodities.

A breach of information security, including a cybersecurity attack, or failure of one or more key information technology or operational systems, or those of third parties, may affect adversely our operations, financial results or reputation.

Our businesses are dependent upon our operational systems to process a large amount of data and complex transactions. The various uses of these information technology systems, networks and services include, but are not limited to:

•controlling our plants and pipelines with industrial control systems including Supervisory Control and Data Acquisition;

•collecting and storing customer, employee, investor and other stakeholder information and data;

•processing transactions;

•summarizing and reporting results of operations;

•hosting, processing and sharing confidential and proprietary research, business plans and financial information;

•complying with regulatory, legal, financial or tax requirements;

•providing data security; and

•other processes necessary to manage our business.

If any of our systems are damaged, fail to function properly or otherwise become unavailable, we may incur substantial costs to repair or replace them and may experience loss or corruption of critical data and interruptions or delays in our ability to perform critical functions, which could affect adversely our business and results of operations. Our financial results could also be affected adversely if an individual causes our operational systems to fail, either as a result of inadvertent error or by deliberately tampering with or manipulating our operational systems. In addition, dependence upon automated systems may further increase the risk that operational system flaws, employee tampering or manipulation of those systems will result in losses that are difficult to detect.

Due to increased technology advances and an increase in remote work arrangements due to the COVID-19 pandemic, we have become more reliant on technology to help increase efficiency in our businesses. We use software to help manage and operate our businesses, and this may subject us to increased risks. According to experts, since the beginning of the COVID-19 pandemic there has been a rise in the number and sophistication of cyberattacks on companies’ network and information systems by both state-sponsored and criminal organizations, and as a result, the risks associated with such an event continue to

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increase. A significant failure, compromise, breach or interruption in our systems, or those of our vendors, could result in a disruption of our operations, physical or environmental damages, customer dissatisfaction, damage to our reputation and a loss of customers or revenues. If any such failure, interruption or similar event results in the improper disclosure of information maintained in our information systems and networks or those of our vendors, including personnel, customer and vendor information, we could also be subject to liability under relevant contractual obligations and laws and regulations protecting personal data and privacy. Efforts by us and our vendors to develop, implement and maintain security measures may not be successful in anticipating, detecting or preventing these events from occurring, and any network and information systems-related events could require us to expend significant resources to identify, assess and remedy such events. Cybersecurity, physical security and the continued development and enhancement of our controls, processes and practices designed to protect our enterprise, information systems and data from attack, damage or unauthorized access and to identify and appropriately report cyberattacks, remain a priority for us. Although we believe that we have robust information security procedures and other safeguards in place, including sufficient insurance, as cyberthreats continue to evolve, we may be required to expend additional resources to continue to enhance our information security measures and/or to investigate and remediate information security vulnerabilities.

Cyberattacks against us or others in our industry could result in additional regulations or contractual obligations. Current efforts by the federal government, such as the Improving Critical Infrastructure Cybersecurity executive order, and the TSA security directives issued in May and July 2021, have utilized significant internal and external resources, and any potential future statutes, regulations or orders could lead to further increased regulatory compliance costs, insurance coverage costs or capital expenditures. We cannot predict the potential impact to our business resulting from additional regulations.

Growing our business by constructing new pipelines and facilities or making modifications to our existing facilities subjects us to construction risk and supply risks, should adequate natural gas or NGL supply be unavailable upon completion of the facilities.

To expand our business, we regularly construct new and modify or expand existing pipelines and gathering, processing, storage and fractionation facilities. The construction and modification of these facilities may involve the following risks:

•projects may require significant capital expenditures, which may exceed our estimates, and involve numerous regulatory, environmental, political, legal and weather-related uncertainties;

•projects may increase demand for labor, materials and rights of way, which may, in turn, affect our costs and schedule;

•we may be unable to obtain new rights of way to connect new natural gas or NGL supplies to our existing gathering or transportation pipelines;

•if we undertake these projects, we may not be able to complete them on schedule or at the budgeted cost;

•our revenues may not increase immediately upon the expenditure of funds on a particular project. For instance, if we build a new pipeline, the construction will occur over an extended period of time, and we will not receive any material increases in revenues until after completion of the project;

•we may construct facilities to capture anticipated future growth in production in a region in which anticipated production growth does not materialize;

•opposition from environmental and social groups, landowners, tribal groups, local groups and other advocates could result in organized protests, attempts to block or sabotage our construction activities or operations, intervention in regulatory or administrative proceedings involving our assets, or lawsuits or other actions designed to prevent, disrupt or delay the construction or operation of our assets; and

•we may be required to rely on third parties downstream of our facilities to have available capacity for our delivered natural gas or NGLs, which may not yet be operational.

As a result, new facilities may not be able to attract enough natural gas or NGLs to achieve our expected investment return, which could affect adversely our business, results of operations, financial position and cash flows.

Estimates of hydrocarbon reserves may be inaccurate, which could result in lower than anticipated volumes.

We may not be able to accurately estimate hydrocarbon reserves and production volumes expected to be delivered to us for a variety of reasons, including the unavailability of sufficiently detailed information and unanticipated changes in producers’ expected drilling schedules. Accordingly, we may not have accurate estimates of total reserves committed to our assets, the anticipated life of such reserves or the expected volumes to be produced from those reserves. In such event, if we are unable to secure additional sources, then the volumes that we gather, process, fractionate and transport in the future could be less than anticipated. A decline in such volumes could affect adversely our business, results of operations, financial position and cash flows.

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We do not own all of the land on which our pipelines and facilities are located, and we lease certain facilities and equipment, which could disrupt our operations.

We do not own all of the land on which certain of our pipelines and facilities are located, and we are, therefore, subject to the risk of increased costs to maintain necessary land use. We obtain the rights to construct and operate certain of our pipelines and related facilities on land owned by third parties and governmental agencies for a specific period of time. Our loss of these rights, through our inability to renew right-of-way contracts on acceptable terms or increased costs to renew such rights, could affect adversely our business, results of operations, financial position and cash flows.

Measurement adjustments on our pipeline system may be impacted materially by changes in estimation, type of commodity and other factors.

Natural gas and NGL measurement adjustments occur as part of the normal operating conditions associated with our assets. The quantification and resolution of measurement adjustments are complicated by several factors including: (i) the significant quantities (i.e., thousands) of measurement equipment that we use across our natural gas and NGL systems, primarily around our gathering and processing assets; (ii) varying qualities of natural gas in the streams gathered and processed through our systems and the mixed nature of NGLs gathered and fractionated; and (iii) variances in measurement that are inherent in metering technologies and standards. Each of these factors may contribute to measurement adjustments that may occur on our systems, which could affect adversely our business, results of operations, financial position and cash flows.

In the competition for supply, we may have significant levels of excess capacity on our natural gas and NGL pipelines, processing, fractionation and storage assets.

Our natural gas and NGL pipelines, processing, fractionation and storage assets compete with other pipelines, processing, fractionation and storage assets for natural gas and NGL supply delivered to the markets we serve. As a result of competition, we may have significant levels of uncontracted or discounted capacity on our assets, which could affect adversely our business, results of operations, financial position and cash flows.

Many of our assets have been in service for several decades.

Many of our pipeline and storage assets are designed as long-lived assets. Over time the age of these assets could result in increased maintenance or remediation expenditures and an increased risk of product releases and associated costs and liabilities. Any significant increase in these expenditures, costs or liabilities could affect adversely our business, results of operations, financial position and cash flows, as well as our ability to pay cash dividends.

Our operating cash flows are derived partially from cash distributions we receive from our unconsolidated affiliates.

Our operating cash flows are derived partially from cash distributions we receive from our unconsolidated affiliates, as discussed in Note M of the Notes to Consolidated Financial Statements in this Annual Report. The amount of cash that our unconsolidated affiliates can distribute principally depends upon the amount of cash flows these affiliates generate from their respective operations, which may fluctuate from quarter to quarter. We do not have any direct control over the cash distribution policies of our unconsolidated affiliates. This lack of control may contribute to us not having sufficient available cash each quarter to continue paying dividends at the current levels.

Additionally, the amount of cash that we have available for cash dividends depends primarily upon our cash flows, including working capital borrowings, and is not solely a function of profitability, which will be affected by noncash items such as depreciation, amortization and provisions for asset impairments. As a result, we may be able to pay cash dividends during periods when we record losses and may not be able to pay cash dividends during periods when we record net income.

We may be unable to cause our joint ventures to take or not to take certain actions unless some or all of our joint-venture participants agree.

We participate in several joint ventures. Due to the nature of some of these arrangements, each participant in these joint ventures has made substantial investments in the joint venture and, accordingly, has required that the relevant charter documents contain certain features designed to provide each participant with the opportunity to participate in the management of the joint venture and to protect its investment, as well as any other assets that may be substantially dependent on or otherwise affected by the activities of that joint venture. These participation and protective features customarily include a corporate governance structure that requires at least a majority-in-interest vote to authorize many basic activities and requires a greater voting interest (sometimes up to 100%) to authorize more significant activities. Examples of these more significant activities

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are large expenditures or contractual commitments, the construction or acquisition of assets, borrowing money or otherwise raising capital, transactions with affiliates of a joint-venture participant, litigation and transactions not in the ordinary course of business, among others. Thus, without the concurrence of joint-venture participants with enough voting interests, we may be unable to cause any of our joint ventures to take or not to take certain actions, even though those actions may be in the best interest of us or the particular joint venture.

Moreover, subject to contractual restrictions, any joint-venture owner generally may sell, transfer or otherwise modify its ownership interest in a joint venture, whether in a transaction involving third parties or the other joint-venture owners. Any such transaction could result in us being required to partner with different or additional parties who may have business interests different from ours.

We do not operate all of our joint-venture assets nor do we employ directly all of the persons responsible for providing administrative, operating and management services. This reliance on others to operate joint-venture assets and to provide other services could affect adversely our business and results of operations.

We rely on others to provide administrative, operating and management services for certain of our joint-venture assets. We have a limited ability to control the operations and the associated costs of such operations. The success of these operations depends on a number of factors that are outside our control, including the competence and financial resources of the operator or an outsourced service provider. We may have to contract elsewhere for outsourced services, which may cost more than we are currently paying. In addition, we may not be able to obtain the same level or kind of service or retain or receive the services in a timely manner, which may impact our ability to perform under our contracts and affect adversely our business and results of operations.

RISK FACTORS RELATED TO REGULATION

Increased regulation of exploration and production activities, including hydraulic fracturing, well setbacks and disposal of wastewater, could result in reductions or delays in drilling and completing new crude oil and natural gas wells.

The crude oil and natural gas industry is relying increasingly on supplies from nonconventional sources, such as shale and tight sands. Natural gas extracted from these sources frequently requires hydraulic fracturing, which involves the pressurized injection of water, sand and chemicals into a geologic formation to stimulate crude oil and natural gas production. Legislation or regulations placing restrictions on exploration and production activities, including hydraulic fracturing and disposal of wastewater, could result in operational delays, increased operating costs and additional regulatory burdens on exploration and production operators. Any of these factors could reduce their production of unprocessed natural gas and, in turn, affect adversely our revenues and results of operations by decreasing the volumes of natural gas and NGLs gathered, treated, processed, fractionated and transported on our or our joint ventures’ assets.

Our business is subject to regulatory oversight and potential penalties.

The energy industry historically has been subject to heavy state and federal regulation that extends to many aspects of our businesses and operations, including:

•change to federal, state and local taxation;

•regulatory approval and review of certain of our rates, operating terms and conditions of service;

•the types of services we may offer our counterparties;

•construction and operation of new facilities;

•the integrity, safety and security of facilities and operations;

•acquisition, extension or abandonment of services or facilities;

•reporting and information posting requirements;

•maintenance of accounts and records; and

•relationships with affiliate companies involved in all aspects of the natural gas and energy businesses.

Compliance with these requirements can be costly and burdensome. Future changes to laws, regulations and policies in these areas may impair our ability to compete for business or to recover costs and may increase the cost and burden of our operations. We cannot guarantee that state or federal regulators will not challenge our safety practices or will authorize any projects or acquisitions that we may propose in the future. Moreover, there can be no guarantee that, if granted, any such authorizations will be made in a timely manner or will be free from potentially burdensome conditions.

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Under the Natural Gas Act, which is applicable to our interstate natural gas pipelines, and the Interstate Commerce Act, which is applicable to our NGL pipelines, our interstate transportation rates are regulated by the FERC and many changes to our pipeline tariffs must be approved in a regulatory proceeding. Additionally, shippers, the FERC and/or state regulatory agencies may investigate our tariff rates which could result in, among other things, being ordered to reduce rates or make refunds to shippers.

Failure to comply with all applicable state or federal statutes, rules and regulations and orders could bring substantial penalties and fines.

We may face significant costs to comply with the regulation of GHG emissions.

GHG emissions originate primarily from combustion engine exhaust, heater exhaust and fugitive methane gas emissions. International, federal, regional and/or state legislative and/or regulatory initiatives may attempt to control or limit GHG emissions, including initiatives directed at issues associated with climate change. Various federal and state legislative proposals have been introduced to regulate the emission of GHGs, particularly carbon dioxide and methane, and the United States Supreme Court has ruled that carbon dioxide is a pollutant subject to regulation by the EPA. In addition, there have been international efforts seeking legally binding reductions in emissions of GHGs.

We believe it is likely that future governmental legislation and/or regulation on the federal, state or regional level may require us either to limit GHG emissions associated with our operations, pay additional taxes or to purchase allowances for certain emissions. These legislative and/or regulatory initiatives could make some of our activities uneconomic to maintain or operate. However, we cannot predict precisely what form these future regulations will take, the stringency of the regulations, when they will become effective or the impact on our capital expenditures, competitive position and results of operations. In addition to activities on the federal level, state and regional initiatives could also lead to the regulation of GHG emissions sooner than or independent of federal regulation. These regulations could be more stringent than any federal legislation that may be adopted. Further, we may not be able to pass on the higher costs to our customers or recover all costs related to complying with GHG regulatory requirements. Our future results of operations, financial position or cash flows could be affected adversely if such costs are not recovered or otherwise passed on to our customers.

Our operations are subject to federal and state laws and regulations relating to the protection of the environment, which may expose us to significant costs and liabilities. Increased litigation challenging oil and gas development and changes to laws, regulations and policies could impact adversely our business.

The risk of incurring substantial environmental costs and liabilities is inherent in our business. Our operations are subject to extensive federal, state and local laws and regulations governing the discharge of materials into, or otherwise relating to the protection of, the environment. Examples of these laws include:

•the Clean Air Act and analogous state laws that impose obligations related to air emissions;

•the Clean Water Act and analogous state laws that regulate discharge of wastewater from our facilities into state and federal waters;

•the federal Comprehensive Environmental Response, Compensation and Liability Act (CERCLA) and analogous state laws that regulate the cleanup of hazardous substances that may have been released at properties currently or previously owned or operated by us or locations to which we have sent waste for disposal; and

•the federal Resource Conservation and Recovery Act (RCRA) and analogous state laws that impose requirements for the handling and discharge of solid and hazardous waste from our facilities.

Recently, the EPA has proposed updating the New Source Performance Standards Subpart OOOO regulations to further reduce methane emissions, which includes increased monitoring frequency and more stringent repair requirements for new and modified oil and gas facilities. In addition, the EPA is proposing new nationwide emission guidelines for states to limit methane emissions from existing facilities. We cannot predict the potential impact to our business resulting from these additional regulations and guidelines.

Various federal and state governmental authorities, including the EPA, have the power to enforce compliance with these laws and regulations and the permits issued under them. Violators are subject to administrative, civil and criminal penalties, including civil fines, injunctions or both. Joint and several, strict liability may be incurred without regard to fault under the CERCLA, RCRA and analogous state laws for the remediation of contaminated areas.

There is an inherent risk of incurring environmental costs and liabilities in our business due to our handling of the products we gather, transport, process and store, air emissions related to our operations, past industry operations and waste disposal

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practices, some of which may be material. Private parties, including the owners of properties through which our pipeline systems pass, may have the right to pursue legal actions to enforce compliance as well as to seek damages for noncompliance with environmental laws and regulations or for personal injury or property damage arising from our operations. Some sites we operate are located near current or former third-party hydrocarbon storage and processing operations, and there is a risk that contamination has migrated from those sites to ours. In addition, increasingly strict laws, regulations and enforcement policies could increase significantly our compliance costs and the cost of any remediation that may become necessary, some of which may be material. Additional information is included under Item 1, Business, under “Regulatory, Environmental and Safety Matters” and in Note N of the Notes to Consolidated Financial Statements in this Annual Report.

Increased litigation challenging oil and gas development, changes to laws, regulations and policies, as well as changes in regulators’ interpretation or application of such laws, regulations and policies could impact our business. These actions could, among other things, impact our customers’ activities, our existing permits and our ability to obtain permits for new development projects, which could affect adversely our business, financial position, or results of operations.

Our insurance may not cover all environmental risks and has limits on coverage in the event an environmental claim is made against us. Our business may be affected adversely by increased costs due to stricter pollution-control requirements or liabilities resulting from noncompliance with required operating or other regulatory permits. New or revised environmental regulations might also affect adversely our products and activities, and federal and state agencies could impose additional safety requirements, all of which could affect adversely our profitability.

RISK FACTORS RELATED TO FINANCING OUR BUSINESS

Changes in interest rates could affect adversely our business.

We use both fixed and variable rate debt, and we are exposed to market risk due to the floating interest rates on our short-term borrowings. Our results of operations, cash flows and financial position could be affected adversely by significant fluctuations in interest rates from current levels.

In July 2017, the head of the United Kingdom Financial Conduct Authority announced the desire to phase out the use of LIBOR by the end of 2021. However, in March 2021, the administrator of LIBOR, the ICE Benchmark Administration, announced all U.S. dollar LIBOR tenors will continue to be published through June 2023, with the exception of one-week and two-month tenors, which ceased at the end of 2021. The U.S. Federal Reserve concurrently issued a statement advising banks to stop new LIBOR issuances by the end of 2021. It is impossible to predict whether and to what extent banks will continue to provide LIBOR submissions to the administrator of LIBOR or whether any additional reforms to LIBOR may be enacted in the United Kingdom or elsewhere. Actions by the British Bankers Association, the United Kingdom Financial Conduct Authority or other regulators or law enforcement agencies as a result of these or future events, may result in changes to the manner in which LIBOR is determined. In addition, any further changes or reforms to the determination or supervision of LIBOR may result in a sudden or prolonged increase or decrease in reported LIBOR.

At this time, no consensus exists as to what rate or rates will become accepted alternatives to LIBOR, although on July 29, 2021, the Alternative Reference Rates Committee, a U.S.-based steering committee composed of large US financial institutions convened by the U.S. Federal Reserve Board and the Federal Reserve Bank of New York, formally recommended SOFR Term rates. Given the inherent differences between LIBOR and SOFR, or any other alternative benchmark rate that is established, there are many uncertainties regarding a transition from LIBOR, including how this will impact the cost of our variable rate debt and certain derivative financial instruments, or whether the COVID-19 pandemic will have further effect on LIBOR transition plans. In addition, although financial institutions are increasingly utilizing SOFR in credit facilities, it is unknown whether SOFR or any other alternative reference rate will attain market acceptance as a replacement for LIBOR.

Our $2.5 Billion Credit Agreement includes provisions that grant the administrative agent discretion to establish a replacement rate for LIBOR, if necessary, which could increase our short-term borrowing costs for amounts issued under this facility.

Any reduction in our credit ratings could affect adversely our business, results of operations, financial position and cash flows.

Our long-term debt has been assigned an investment-grade credit rating of “Baa3” by Moody’s and “BBB” by both S&P and Fitch. Our commercial paper program has been assigned an investment-grade credit rating of Prime-3, A-2 and F-2 by Moody’s, S&P and Fitch, respectively. We cannot provide assurance that any of our current ratings will remain in effect for any given period of time or that a rating will not be lowered or withdrawn entirely by these credit rating agencies. If these agencies were to downgrade our long-term debt or our commercial paper rating, particularly below investment grade, our

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borrowing costs could increase, which would affect adversely our financial results, and our potential pool of investors and funding sources could decrease. Ratings from these agencies are not recommendations to buy, sell or hold our securities. Each rating should be evaluated independently of any other rating.

Our indebtedness and guarantee obligations could impair our financial condition and our ability to fulfill our obligations.

As of December 31, 2021, we had total indebtedness of $13.6 billion. Our indebtedness and guarantee obligations could have significant consequences. For example, they could:

•make it more difficult for us to satisfy our obligations with respect to senior notes and other indebtedness due to the increased debt-service obligations, which could, in turn, result in an event of default on such other indebtedness or the senior notes;

•impair our ability to obtain additional financing in the future for working capital, capital expenditures, acquisitions or general business purposes;

•diminish our ability to withstand a downturn in our business or the economy;

•require us to dedicate a substantial portion of our cash flows from operations to debt-service payments, reducing the availability of cash for working capital, capital expenditures, acquisitions, dividends or general corporate purposes;

•limit our flexibility in planning for, or reacting to, changes in our business and the industry in which we operate; and

•place us at a competitive disadvantage compared with our competitors that have proportionately less debt and fewer guarantee obligations.

We are not prohibited under the indentures governing the senior notes from incurring additional indebtedness, but our debt agreements do subject us to certain operational limitations summarized in the next paragraph. If we incur significant additional indebtedness, it could worsen the negative consequences mentioned above and could affect adversely our ability to repay our other indebtedness.

Our $2.5 Billion Credit Agreement contains provisions that restrict our ability to finance future operations or capital needs or to expand or pursue our business activities. For example, our $2.5 Billion Credit Agreement contains provisions that, among other things, limit our ability to make loans or investments, make material changes to the nature of our business, merge, consolidate or engage in asset sales, grant liens or make negative pledges. It also requires us to maintain certain financial ratios, which limit the amount of additional indebtedness we can incur, as described in the “Liquidity and Capital Resources” section of Part II, Item 7, Management’s Discussion and Analysis of Financial Condition and Results of Operations, in this Annual Report. These restrictions could result in higher costs of borrowing and impair our ability to generate additional cash. Future financing agreements we may enter into may contain similar or more restrictive covenants.

If we are unable to meet our debt-service obligations or comply with financial covenants, we could be forced to restructure or refinance our indebtedness, seek additional equity capital or sell assets. We may be unable to obtain financing or sell assets on satisfactory terms, or at all.

An event of default may require us to offer to repurchase certain of our and ONEOK Partners’ senior notes or may impair our ability to access capital.

The indentures governing certain of our and ONEOK Partners’ senior notes include an event of default upon the acceleration of other indebtedness of $15 million or more for certain of our senior notes or $100 million or more for certain of our and ONEOK Partners’ senior notes. Such events of default would entitle the trustee or the holders of 25% in aggregate principal amount of our and ONEOK Partners’ outstanding senior notes to declare those senior notes immediately due and payable in full. We may not have sufficient cash on hand to repurchase and repay any accelerated senior notes, which may cause us to borrow money under our credit facility or seek alternative financing sources to finance the repurchases and repayment. We could also face difficulties accessing capital or our borrowing costs could increase, impacting our ability to obtain financing for acquisitions or capital expenditures, to refinance indebtedness and to fulfill our debt obligations.

The right to receive payments on our outstanding debt securities and subsidiary guarantees is unsecured and will be effectively subordinated to any future secured indebtedness as well as to any existing and future indebtedness of our subsidiaries that do not guarantee the senior notes.

Although ONEOK Partners and the Intermediate Partnership have guaranteed our debt securities, the guarantees are subject to release under certain circumstances, and we have subsidiaries that are not guarantors. In those cases, the debt securities effectively are subordinated to the claims of all creditors, including trade creditors and tort claimants, of our subsidiaries that

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are not guarantors. In the event of the insolvency, bankruptcy, liquidation, reorganization, dissolution or winding up of the business of a subsidiary that is not a guarantor, creditors of that subsidiary would generally have the right to be paid in full before any distribution is made to us or the holders of the debt securities.

A court may use fraudulent conveyance considerations to avoid or subordinate the cross guarantees of our and ONEOK Partners’ indebtedness.

ONEOK, ONEOK Partners and the Intermediate Partnership have cross guarantees in place for our and ONEOK Partners’ indebtedness. A court may use fraudulent conveyance laws to subordinate or avoid the cross guarantees of certain of our and ONEOK Partners’ indebtedness. It is also possible that under certain circumstances, a court could avoid or subordinate the guarantor’s guarantee of our and ONEOK Partners’ indebtedness in favor of the guarantor’s other debts or liabilities to the extent that the court determined either of the following were true at the time the guarantor issued the guarantee:

•the guarantor incurred the guarantee with the intent to hinder, delay or defraud any of its present or future creditors or the guarantor contemplated insolvency with a design to favor one or more creditors to the total or partial exclusion of others; or

•the guarantor did not receive fair consideration or reasonable equivalent value for issuing the guarantee and, at the time it issued the guarantee, the guarantor:

–     was insolvent or rendered insolvent by reason of the issuance of the guarantee;

–     was engaged or about to engage in a business or transaction for which its remaining assets constituted unreasonably small capital; or

–     intended to incur, or believed that it would incur, debts beyond its ability to pay such debts as they matured.

The measure of insolvency for purposes of the foregoing will vary depending upon the law of the relevant jurisdiction. Generally, however, an entity would be considered insolvent for purposes of the foregoing if:

•the sum of its debts, including contingent liabilities, were greater than the fair saleable value of all of its assets at a fair valuation;

•the present fair saleable value of its assets was less than the amount that would be required to pay its probable liability on its existing debts, including contingent liabilities, as they become absolute and mature; or

•it could not pay its debts as they become due.

Among other things, a legal challenge of the cross guarantees of our and ONEOK Partners’ indebtedness on fraudulent conveyance grounds may focus on the benefits, if any, realized by the guarantor as a result of our and ONEOK Partners’ issuance of such debt. To the extent the guarantor’s guarantee of our and ONEOK Partners’ indebtedness is avoided as a result of fraudulent conveyance or held unenforceable for any other reason, the holders of such debt would cease to have any claim in respect of the guarantee.

GENERAL RISK FACTORS

Holders of our common stock may receive dividends that vary from anticipated amounts, or no dividends at all.

We may not have sufficient cash each quarter to pay dividends or maintain current or expected levels of dividends. The actual amount of cash we pay in the form of dividends may fluctuate from quarter to quarter and will depend on various factors, some of which are beyond our control, including our working capital needs, our ability to borrow, the restrictions contained in our indentures and credit facility, our debt service requirements and the cost of acquisitions, if any. A failure either to pay dividends or to pay dividends at expected levels could result in a loss of investor confidence, reputational damage and a decrease in the value of our stock price.

We are exposed to the credit risk of our customers or counterparties, and our credit-risk management may not be adequate to protect against such risk.

We are subject to the risk of loss resulting from nonpayment and/or nonperformance by our customers and counterparties. Our customers or counterparties may experience rapid deterioration of their financial condition as a result of changing market conditions, commodity prices or financial difficulties that could impact their creditworthiness or ability to pay us for our services. We assess the creditworthiness of our customers and counterparties and obtain collateral or contractual terms as we deem appropriate. We cannot, however, predict to what extent our business may be impacted by deteriorating market or financial conditions, including possible declines in our customers’ and counterparties’ creditworthiness. Our customers and counterparties may not perform or adhere to our existing or future contractual arrangements. To the extent our customers and counterparties are in financial distress or commence bankruptcy proceedings, contracts with them may be subject to

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renegotiation or rejection under applicable provisions of the United States Bankruptcy Code. If our risk-management policies and procedures fail to assess adequately the creditworthiness of existing or future customers and counterparties, any material nonpayment or nonperformance by our customers and counterparties due to inability or unwillingness to perform or adhere to contractual arrangements could affect adversely our business, results of operations, financial position, cash flows and ability to pay cash dividends to our shareholders.

We are connected to market areas located in the Mid-Continent, Rocky Mountain, Permian Basin, Midwest markets, including Chicago, Illinois, and Gulf Coast regions of the U.S. Our counterparties are primarily major integrated and independent exploration and production, pipeline, marketing and petrochemical companies and natural gas and electric utilities. Therefore, our counterparties may be similarly affected by changes in economic, regulatory or other factors that may affect our overall credit risk.

A shortage of skilled labor may make it difficult for us to maintain labor productivity and competitive costs.

Our operations require skilled and experienced workers with proficiency in multiple tasks. In recent years, a shortage of workers trained in various skills associated with the midstream energy business has, at times, caused us to conduct certain operations without full staff, thus hiring outside resources, which may decrease productivity and increase costs. This shortage of trained workers is the result of experienced workers reaching retirement age and increased competition for workers in certain areas, combined with the challenges of attracting new, qualified workers to the midstream energy industry. This shortage of skilled labor could continue over an extended period. If the shortage of experienced labor continues or worsens, it could affect adversely our labor productivity and costs and our ability to expand operations in the event there is an increase in the demand for our services and products, which could affect adversely our business, results of operations, financial position and cash flows.

Our employees or directors may engage in misconduct or other improper activities, including noncompliance with regulatory standards and requirements.

As with all companies, we are exposed to the risk of employee fraud or other misconduct. Our Board of Directors has adopted a code of business conduct and ethics that applies to our directors, officers (including our principal executive and financial officers, principal accounting officer, controllers and other persons performing similar functions) and all other employees. We require all directors, officers and employees to adhere to our code of business conduct and ethics in addressing the legal and ethical issues encountered in conducting their work for our company. Our code of business conduct and ethics requires, among other things, that our directors, officers and employees avoid conflicts of interest, comply with all applicable laws and other legal requirements, conduct business in an honest and ethical manner and otherwise act with integrity and in our company’s best interest. All directors, officers and employees are required to report any conduct that they believe to be an actual or apparent violation of our code of business conduct and ethics. However, it is not always possible to identify and deter misconduct, and the precautions we take to detect and prevent this activity may not be effective in controlling unknown or unmanaged risks or losses or in protecting us from governmental investigations or other actions or lawsuits stemming from a failure to comply with such laws or regulations. If any such actions are instituted against us, and we are not successful in defending ourselves or asserting our rights, those actions could affect adversely our reputation, business, results of operations, financial position and cash flows.

An impairment of goodwill, long-lived assets, including intangible assets, and equity-method investments could reduce our earnings.

Goodwill is recorded when the purchase price of a business exceeds the fair market value of the tangible and separately measurable intangible net assets. GAAP requires us to test goodwill for impairment on an annual basis or when events or circumstances occur indicating that goodwill might be impaired. Long-lived assets, including intangible assets with finite useful lives, are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount may not be recoverable. For the investments we account for under the equity method, the impairment test considers whether the fair value of the equity investment as a whole, not the underlying net assets, has declined and whether that decline is other than temporary. For example, if a low commodity price environment persisted for a prolonged period, it could result in lower volumes delivered to our systems and impairments of our assets or equity-method investments. If we determine that an impairment is indicated, we would be required to take an immediate noncash charge to earnings with a correlative effect on equity and balance sheet leverage as measured by consolidated debt to total capitalization.

For further discussion of impairments of goodwill, long-lived assets and equity-method investments, see Notes A, E, D and M, respectively, of the Notes to Consolidated Financial Statements in this Annual Report.

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Acquisitions that appear to be accretive may nevertheless reduce our cash from operations on a per-share basis.

Any acquisition involves potential risks that may include, among other things:

•inaccurate assumptions about volumes, revenues and costs, including potential synergies;

•an inability to integrate successfully the businesses we acquire;

•decrease in our liquidity as a result of our using a significant portion of our available cash or borrowing capacity to finance the acquisition;

•a significant increase in our interest expense and/or financial leverage if we incur additional debt to finance the acquisition;

•the assumption of unknown liabilities for which we are not indemnified, our indemnity is inadequate or our insurance policies may exclude from coverage;

•an inability to hire, train or retain qualified personnel to manage and operate the acquired business and assets;

•limitations on rights to indemnity from the seller;

•inaccurate assumptions about the overall costs of equity or debt;

•the diversion of management’s and employees’ attention from other business concerns;

•unforeseen difficulties operating in new product areas or new geographic areas;

•increased regulatory burdens;

•customer or key employee losses at an acquired business; and

•increased regulatory requirements.

If we consummate any future acquisitions, our capitalization and results of operations may change significantly, and investors will not have the opportunity to evaluate the economic, financial and other relevant information that we will consider in determining the application of our resources to future acquisitions.

The cost of providing pension and postretirement health care benefits to eligible employees and qualified retirees is subject to changes in pension fund values and changing demographics and may increase.

We have a defined benefit pension plan for certain employees and former employees, which closed to new participants in 2005, and postretirement welfare plans that provide postretirement medical and life insurance benefits to certain employees hired prior to 2017 who retire with at least five years of full-time service. The cost of providing these benefits to eligible current and former employees is subject to changes in the market value of our pension and postretirement benefit plan assets, changing demographics, including longer life expectancy of plan participants and their beneficiaries and changes in health care costs. For further discussion of our defined benefit pension plan and postretirement welfare plans, see Note K of the Notes to Consolidated Financial Statements in this Annual Report.

Any sustained declines in equity markets and reductions in bond yields may affect adversely the value of our pension and postretirement benefit plan assets. In these circumstances, additional cash contributions to our pension plans may be required, which could affect adversely our business, financial condition and liquidity.

If we fail to maintain an effective system of internal controls, we may not be able to report accurately our financial results or prevent fraud. As a result, current and potential holders of our equity and debt securities could lose confidence in our financial reporting.

Effective internal controls are necessary for us to provide reliable financial reports, prevent fraud and operate successfully as a public company. We cannot be certain that our efforts to maintain our internal controls will be successful, that we will be able to maintain adequate controls over our financial processes and reporting in the future or that we will be able to continue to comply with our obligations under Section 404 of the Sarbanes-Oxley Act of 2002. Any failure to maintain effective internal controls, or difficulties encountered in implementing or improving our internal controls, could harm our operating results or cause us to fail to meet our reporting obligations. Ineffective internal controls could also cause investors to lose confidence in our reported financial information, which would likely have a negative effect on the trading price of our equity, our access to capital markets and the cost of capital.

ITEM 1B.    UNRESOLVED STAFF COMMENTS

Not applicable.

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ITEM 2.    PROPERTIES

A description of our properties is included in Item 1, Business.

ITEM 3.    LEGAL PROCEEDINGS

Information about our legal proceedings is included in Note N of the Notes to Consolidated Financial Statements in this Annual Report.

ITEM 4.    MINE SAFETY DISCLOSURES

Not applicable.

PART II

ITEM 5.    MARKET FOR REGISTRANT’S COMMON EQUITY, RELATED STOCKHOLDER MATTERS AND ISSUER PURCHASES OF EQUITY SECURITIES

Our common stock is listed on the NYSE under the trading symbol “OKE.” The corporate name ONEOK is used in newspaper stock listings.

At February 22, 2022, there were 13,198 holders of record of our 446,213,285 outstanding shares of common stock.

For information regarding our Employee Stock Award Program and other equity compensation plans, see Note J of the Notes to Consolidated Financial Statements and “Equity Compensation Plan Information” included in Part III, Item 12, Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters, in this Annual Report.

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PERFORMANCE GRAPH

The following performance graph compares the performance of our common stock with the S&P 500 Index, the Alerian Midstream Energy Select Index and a ONEOK Peer Group during the period beginning on December 31, 2016, and ending on December 31, 2021.

Value of a $100 Investment, Assuming Reinvestment of Distributions/Dividends,

at December 31, 2016, and at the End of Every Year Through December 31, 2021.

	Cumulative Total Return
	Years Ended December 31,
	2017		2018		2019		2020		2021
ONEOK, Inc.	$	97.92	$	104.07	$	153.80	$	87.11	$	143.59
S&P 500 Index	$	121.83	$	116.49	$	153.17	$	181.35	$	233.41
ONEOK Peer Group (a)	$	93.45	$	77.86	$	87.11	$	64.37	$	91.97
Alerian Midstream Energy Select Index (b)	$	100.76	$	82.95	$	101.49	$	77.72	$	109.39

(a) - The ONEOK Peer Group is composed of the following companies: DCP Midstream, LP; Energy Transfer LP; EnLink Midstream, LLC; Enterprise Products Partners L.P.; Kinder Morgan, Inc.; Magellan Midstream Partners, L.P.; MPLX LP; NuStar Energy L.P.; Plains All American Pipeline, L.P.; Targa Resources Corp.; and The Williams Companies, Inc.

(b) - The Alerian Midstream Energy Select Index measures the composite performance of approximately 33 North American energy infrastructure companies who are engaged in midstream activities involving energy commodities.

ITEM 6.    [RESERVED]

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ITEM 7.    MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

The following discussion and analysis should be read in conjunction with Part I, Item 1, Business, our audited Consolidated Financial Statements and the Notes to Consolidated Financial Statements in this Annual Report.

RECENT DEVELOPMENTS

Please refer to the “Financial Results and Operating Information” and “Liquidity and Capital Resources” sections of Management’s Discussion and Analysis of Financial Condition and Results of Operations in this Annual Report for additional information.

Market Conditions - We experienced earnings growth from increased volumes in 2021, compared with 2020, due primarily to increased producer activity and rising gas-to-oil ratios in the Rocky Mountain region, production curtailments in 2020, increased ethane production in the Rocky Mountain region and higher commodity prices in both our Natural Gas Gathering and Processing and Natural Gas Liquids segments, highlighting both the resiliency of our integrated assets and the economic recovery from the pandemic.

Ethane Production - Price differentials between ethane and natural gas can cause natural gas processors to extract ethane or leave it in the natural gas stream, known as ethane rejection. As a result of these ethane economics, ethane volumes on our system can fluctuate period to period. Ethane volumes under long-term contracts delivered to our NGL system increased approximately 55 MBbl/d to an average of 430 MBbl/d in 2021, compared with 375 MBbl/d in 2020, due primarily to changes in ethane extraction economics. We estimate that there are more than 225 MBbl/d of discretionary ethane, consisting of more than 125 MBbl/d in the Rocky Mountain region and approximately 100 MBbl/d in the Mid-Continent region, that can be recovered and transported on our system. Ethane recovery opportunities will fluctuate based on regional natural gas pricing and ethane economics.

Growth Projects - We operate an integrated, reliable and diversified network of NGL and natural gas gathering, processing, fractionation, storage and transportation assets connecting supply in the Rocky Mountain, Mid-Continent and Permian regions with key market centers. Our publicly announced capital-growth projects are outlined in the table below:

Project	Scope	Approximate Costs (a)	Completion
Natural Gas Gathering and Processing		(In millions)
Bear Creek plant expansion and related infrastructure	200 MMcf/d processing plant expansion and related gathering infrastructure in the Williston Basin	$405	Completed
	Supported by acreage dedications with long-term primarily fee-based contracts
Demicks Lake III plant	200 MMcf/d processing plant in the core of the Williston Basin	$188 (b)	First Quarter 2023
	Supported by acreage dedications with primarily fee-based contracts
Natural Gas Liquids
Arbuckle II pipeline expansion	Increased mainline capacity with additional pump facilities	$60	Completed
	Increased capacity to 500 MBbl/d
MB-5 fractionator	125 MBbl/d NGL fractionator in Mont Belvieu, Texas	$750 (c)	Third Quarter 2023

(a) - Excludes capitalized interest/AFUDC.

(b) - In November 2021, we announced that we restarted construction of the Demicks Lake III natural gas processing plant. Upon announcement, the expected cost to complete was approximately $140 million.

(c) - In November 2021, we announced that we restarted construction of the MB-5 NGL fractionator. Upon announcement, the expected cost to complete was approximately $250 million.

Debt Repayments - In November 2021, we redeemed the remaining $536.1 million of our $700 million, 4.25% senior notes due February 2022 at 100% of the principal amount, plus accrued and unpaid interest, with cash on hand and short-term borrowings.

In June 2021, we repaid the remaining $11.7 million of Guardian Pipeline’s senior notes due December 2022 with cash on hand.

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In 2021, we repurchased in the open market outstanding principal of certain of our senior notes in the amount of $55.2 million for an aggregate repurchase price of $54.6 million with cash on hand.

Dividends - During 2021, we paid common stock dividends totaling $3.74 per share, which is consistent with the prior year. In February 2022, we paid a quarterly common stock dividend of $0.935 per share ($3.74 per share on an annualized basis), which is consistent with the same quarter in the prior year.

FINANCIAL RESULTS AND OPERATING INFORMATION

How We Evaluate Our Operations

Management uses a variety of financial and operating metrics to analyze our performance. Our consolidated financial metrics include: (1) operating income; (2) net income; (3) diluted EPS; and (4) adjusted EBITDA. We evaluate segment operating results using adjusted EBITDA and our operating metrics, which include various volume and rate statistics that are relevant for the respective segment. These operating metrics allow investors to analyze the various components of segment financial results in terms of volumes and rate/price. Management uses these metrics to analyze historical segment financial results and as the key inputs for forecasting and budgeting segment financial results. For additional information on our operating metrics, see the respective segment subsections of this “Financial Results and Operating Information” section.

Non-GAAP Financial Measures - Adjusted EBITDA is a non-GAAP measure of our financial performance. Adjusted EBITDA is defined as net income adjusted for interest expense, depreciation and amortization, noncash impairment charges, income taxes, allowance for equity funds used during construction, noncash compensation expense and certain other noncash items. We believe this non-GAAP financial measure is useful to investors because it and similar measures are used by many companies in our industry as a measurement of financial performance and is commonly employed by financial analysts and others to evaluate our financial performance and to compare financial performance among companies in our industry. Adjusted EBITDA should not be considered an alternative to net income, EPS or any other measure of financial performance presented in accordance with GAAP. Additionally, this calculation may not be comparable with similarly titled measures of other companies.

Consolidated Operations

Selected Financial Results - The following table sets forth certain selected consolidated financial results for the periods indicated:

	Years Ended December 31,						2021 vs. 2020	2020 vs. 2019
Financial Results	2021		2020		2019		$ Increase (Decrease)
	(Millions of dollars, except per share amounts)
Revenues
Commodity sales	$	15,180.3	$	7,255.2	$	8,916.1	7,925.1	(1,660.9)
Services	1,360.0		1,287.0		1,248.3		73.0	38.7
Total revenues	16,540.3		8,542.2		10,164.4		7,998.1	(1,622.2)
Cost of sales and fuel (exclusive of items shown separately below)	12,256.7		5,110.1		6,788.0		7,146.6	(1,677.9)
Operating costs	1,067.0		886.1		982.9		180.9	(96.8)
Depreciation and amortization	621.7		578.7		476.5		43.0	102.2
Impairment charges	—		607.2		—		(607.2)	607.2
(Gain) loss on sale of assets	(1.4)		(1.3)		2.6		0.1	3.9
Operating income	$	2,596.3	$	1,361.4	$	1,914.4	1,234.9	(553.0)
Equity in net earnings from investments	$	122.5	$	143.2	$	154.5	(20.7)	(11.3)
Impairment of equity investments	$	—	$	(37.7)	$	—	(37.7)	37.7
Interest expense, net of capitalized interest	$	(732.9)	$	(712.9)	$	(491.8)	20.0	221.1
Net income	$	1,499.7	$	612.8	$	1,278.6	886.9	(665.8)
Diluted EPS	$	3.35	$	1.42	$	3.07	1.93	(1.65)
Adjusted EBITDA	$	3,379.7	$	2,723.7	$	2,580.2	656.0	143.5
Capital expenditures	$	696.9	$	2,195.4	$	3,848.3	(1,498.5)	(1,652.9)

See reconciliation of net income to adjusted EBITDA in the “Non-GAAP Financial Measures” section.

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Changes in commodity prices and sales volumes affect both revenues and cost of sales and fuel in our Consolidated Statements of Income, and, therefore, the impact is largely offset between these line items.

2021 vs. 2020 - Operating income increased $1.2 billion primarily as a result of the following:

•an increase of $607.2 million due to noncash impairment charges in our Natural Gas Gathering and Processing and Natural Gas Liquids segments in 2020;

•Natural Gas Liquids - increases of $421.4 million in exchange services related primarily to higher volumes in the Rocky Mountain region, the Mid-Continent region and Permian Basin and wider commodity price differentials, and $98.3 million in optimization and marketing. These increases were offset partially by a decrease of $46.2 million from the impact of Winter Storm Uri in exchange services;

•Natural Gas Gathering and Processing - increases of $143.5 million due primarily to lower realized prices in 2020 impacting our fee with POP contracts and $115.8 million from higher volumes due primarily to increased production and rising gas-to-oil ratios in the Rocky Mountain region in 2021 and production curtailments in 2020; and

•Natural Gas Pipelines - an increase of $109.1 million due to primarily to increased natural gas sales; offset by

•an increase of $180.9 million in consolidated operating costs due primarily to higher employee costs related to short-term incentives, property taxes, outside services and the impact of a loss on the mark-to-market of our share-based deferred compensation plan in 2021 compared with a benefit in 2020; and

•an increase of $43.0 million in depreciation expense due to capital projects placed in service.

Net income and diluted EPS increased due primarily to the items discussed above and noncash impairment charges related to equity investments in our Natural Gas Gathering and Processing and Natural Gas Liquids segments in the prior year. These increases were offset partially by higher income taxes, higher interest expense related to lower capitalized interest and lower equity AFUDC due to completed projects, lower equity in net earnings from investments and a gain in 2020 on extinguishment of debt related to open market repurchases.

Capital expenditures decreased due primarily to our completed and paused capital-growth projects.

Additional information regarding our financial results and operating information is provided in the discussions for each of our segments.

Selected Financial Results and Operating Information for the Year Ended December 31, 2020 vs. 2019 - The consolidated and segment financial results and operating information for the year ended December 31, 2020, compared with the year ended December 31, 2019, are included in Part II, Item 7, Management’s Discussion and Analysis of Financial Condition and Results of Operations of our 2020 Annual Report on Form 10-K, which is available via the SEC’s website at www.sec.gov and our website at www.oneok.com.

Natural Gas Gathering and Processing

Growth Projects - Our Natural Gas Gathering and Processing segment has invested in growth projects in NGL-rich areas in the Williston Basin. See “Growth Projects” in the “Recent Developments” section for discussion of our capital-growth projects.

For a discussion of our capital expenditure financing, see “Capital Expenditures” in the “Liquidity and Capital Resources” section.

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Selected Financial Results and Operating Information - The following tables set forth certain selected financial results and operating information for our Natural Gas Gathering and Processing segment for the periods indicated:

	Years Ended December 31,						2021 vs. 2020	2020 vs. 2019
Financial Results	2021		2020		2019		$ Increase (Decrease)
	(Millions of dollars)
NGL and condensate sales	$	2,821.2	$	889.4	$	1,224.4	1,931.8	(335.0)
Residue natural gas sales	1,483.9		771.5		966.1		712.4	(194.6)
Gathering, compression, dehydration and processing fees and other revenue	156.4		159.2		178.1		(2.8)	(18.9)
Cost of sales and fuel (exclusive of depreciation and operating costs)	(3,226.1)		(844.0)		(1,302.3)		2,382.1	(458.3)
Operating costs, excluding noncash compensation adjustments	(351.4)		(320.0)		(352.8)		31.4	(32.8)
Equity in net earnings (loss) from investments	3.8		(1.1)		(6.3)		4.9	5.2
Other	1.3		(5.0)		(4.5)		6.3	(0.5)
Adjusted EBITDA	$	889.1	$	650.0	$	702.7	239.1	(52.7)
Impairment charges	$	—	$	566.1	$	—	(566.1)	566.1
Capital expenditures	$	275.2	$	446.1	$	926.5	(170.9)	(480.4)

See reconciliation of net income to adjusted EBITDA in the “Non-GAAP Measures” section.

Changes in commodity prices and sales volumes affect both revenue and cost of sales and fuel, and, therefore, the impact is largely offset between these line items.

2021 vs. 2020 - Adjusted EBITDA increased $239.1 million, primarily as a result of the following:

•an increase of $143.5 million due primarily to lower realized prices, net of hedging, in 2020 impacting our fee with POP contracts; and

•an increase of $115.8 million from higher volumes due primarily to increased production and rising gas-to-oil ratios in the Rocky Mountain region in 2021 and production curtailments in 2020, offset partially by natural production declines in the Mid-Continent region; and

•an increase of $7.3 million from a gain on the partial sale of an equity investment; offset by

•an increase of $31.4 million in operating costs due primarily to higher employee costs related to short-term incentives.

Capital expenditures decreased due primarily to completed capital-growth projects in 2020.

	Years Ended December 31,
Operating Information (a)	2021		2020		2019
Natural gas gathered (BBtu/d)	2,736		2,553		2,753
Natural gas processed (BBtu/d) (b)	2,515		2,364		2,555
Average fee rate ($/MMBtu)	$	1.04	$	0.89	$	0.92

(a) - Includes volumes for consolidated entities only.

(b) - Includes volumes at company-owned and third-party facilities.

2021 vs. 2020 - Our natural gas gathered and natural gas processed volumes increased due primarily to increased producer activity and rising gas-to-oil ratios in the Rocky Mountain region and the impact of curtailed production in 2020, offset partially by natural production declines in the Mid-Continent region.

Our average fee rate increased due primarily to production curtailments in the second quarter 2020 on producer contracts with higher fees and lower POP components in the Rocky Mountain region. As these curtailed volumes have returned to our system and producer activity has continued to increase, the Rocky Mountain region’s contribution to our average fee rate increased in 2021.

Commodity Price Risk - See discussion regarding our commodity price risk under “Commodity Price Risk” in Item 7A, Quantitative and Qualitative Disclosures about Market Risk.

Impairments - The year ended December 31, 2020, includes $382.2 million of noncash impairment charges related primarily to certain long-lived asset groups in the Powder River Basin, western Oklahoma and Kansas that were not recoverable, a

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$153.4 million noncash impairment charge related to goodwill and a $30.5 million noncash impairment charge related to our 10.2% investment in Venice Energy Services Company.

Natural Gas Liquids

Growth Projects - Our Natural Gas Liquids segment invests in projects to transport, fractionate, store and deliver to market centers NGL supply from shale and other resource development areas. Our growth strategy is focused around connecting diversified supply basins from the Rocky Mountain region through the Mid-Continent region and the Permian Basin with NGL product demand from the petrochemical and refining industries and NGL export demand in the Gulf Coast. See “Growth Projects” in the “Recent Developments” section for discussion of our capital-growth projects.

In 2021, we connected one third-party natural gas processing plant in the Permian Basin and one third-party natural gas processing plant in the Rocky Mountain region to our NGL system. In addition, one affiliate natural gas processing plant in the Rocky Mountain region connected to our system was expanded.

For a discussion of our capital expenditure financing, see “Capital Expenditures” in the “Liquidity and Capital Resources” section.

Selected Financial Results and Operating Information - The following tables set forth certain selected financial results and operating information for our Natural Gas Liquids segment for the periods indicated:

	Years Ended December 31,						2021 vs. 2020	2020 vs. 2019
Financial Results	2021		2020		2019		$ Increase (Decrease)
	(Millions of dollars)
NGL and condensate sales	$	13,653.1	$	6,409.3	$	7,910.8	7,243.8	(1,501.5)
Exchange service revenues and other	559.2		497.8		424.2		61.4	73.6
Transportation and storage revenues	179.6		182.9		197.5		(3.3)	(14.6)
Cost of sales and fuel (exclusive of depreciation and operating costs)	(11,939.7)		(5,108.6)		(6,690.9)		6,831.1	(1,582.3)
Operating costs, excluding noncash compensation adjustments	(499.4)		(396.4)		(434.4)		103.0	(38.0)
Equity in net earnings from investments	21.0		39.9		65.1		(18.9)	(25.2)
Other	(10.2)		(7.7)		(6.5)		(2.5)	(1.2)
Adjusted EBITDA	$	1,963.6	$	1,617.2	$	1,465.8	346.4	151.4
Impairment charges	$	—	$	78.8	$	—	(78.8)	78.8
Capital expenditures	$	306.9	$	1,655.8	$	2,796.6	(1,348.9)	(1,140.8)

See reconciliation of net income to adjusted EBITDA in the “Non-GAAP Measures” section.

Changes in commodity prices and sales volumes affect both revenues and cost of sales and fuel, and, therefore, the impact is largely offset between these line items.

2021 vs. 2020 - Adjusted EBITDA increased $346.4 million primarily as a result of the following:

•an increase of $421.4 million in exchange services (excluding the impact of Winter Storm Uri discussed below) due primarily to:

◦$261.6 million in higher volumes primarily in the Rocky Mountain region, Mid-Continent region and Permian Basin, offset partially by lower volumes in the Barnett Shale,

◦$98.9 million related to wider commodity price differentials,

◦$63.8 million in lower transportation costs in the Rocky Mountain region, and

◦$12.9 million related to recognition of proceeds previously considered a gain contingency; and

•an increase of $98.3 million in optimization and marketing due primarily to wider location and commodity price differentials, increased activities during Winter Storm Uri and higher optimization volumes; offset by

•the negative impact of Winter Storm Uri of $46.2 million in exchange services due primarily to decreased volumes across our operations and higher electricity costs;

•an increase of $103.0 million in operating costs due primarily to increased property taxes associated with our completed capital-growth projects, higher employee costs related to short-term incentives and higher outside services; and

•a decrease of $18.9 million from lower equity in net earnings from investments due primarily to lower volumes on Overland Pass Pipeline.

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Capital expenditures decreased due primarily to completed and paused capital-growth projects in 2020.

	Years Ended December 31,
Operating Information	2021		2020		2019
Raw feed throughput (MBbl/d) (a)	1,198		1,084		1,079
Average Conway-to-Mont Belvieu OPIS price differential - ethane in ethane/propane mix ($/gallon)	$	(0.01)	$	0.01	$	0.07

(a) - Represents physical raw feed volumes on which we charge a fee for transportation and/or fractionation services.

2021 vs. 2020 - Volumes increased due primarily to increased production primarily in the Rocky Mountain region, Mid-Continent region and Permian Basin, increased ethane production in the Rocky Mountain region, and the impact of curtailed production across our system in 2020, offset partially by the impact of Winter Storm Uri in 2021 and lower volumes in the Barnett Shale.

Impairments - The year ended December 31, 2020, includes $71.6 million of noncash impairment charges related primarily to certain inactive assets and a $7.2 million noncash impairment charge related to our 50% investment in Chisholm Pipeline Company.

Natural Gas Pipelines

Selected Financial Results and Operating Information - The following tables set forth certain selected financial results and operating information for our Natural Gas Pipelines segment for the periods indicated:

	Years Ended December 31,						2021 vs. 2020	2020 vs. 2019
Financial Results	2021		2020		2019		$ Increase (Decrease)
	(Millions of dollars)
Transportation revenues	$	412.9	$	401.7	$	393.7	11.2	8.0
Storage revenues	77.6		68.4		72.6		9.2	(4.2)
Residue natural gas sales and other revenues	116.4		9.9		5.7		106.5	4.2
Cost of sales and fuel (exclusive of depreciation and operating costs)	(11.2)		(6.8)		(4.6)		4.4	2.2
Operating costs, excluding noncash compensation adjustments	(162.1)		(137.2)		(150.8)		24.9	(13.6)
Equity in net earnings from investments	97.8		104.4		95.7		(6.6)	8.7
Other	(3.6)		(3.0)		(3.5)		(0.6)	0.5
Adjusted EBITDA	$	527.8	$	437.4	$	408.8	90.4	28.6
Capital expenditures	$	92.6	$	71.9	$	99.2	20.7	(27.3)

See reconciliation of net income to adjusted EBITDA in the “Non-GAAP Measures” section.

2021 vs. 2020 - Adjusted EBITDA increased $90.4 million primarily as a result of the following:

•an increase of $109.1 million due primarily to higher average natural gas prices on 5.2 Bcf of natural gas sales in the first quarter 2021 of volumes previously held in inventory, compared with 1.2 Bcf in the first quarter 2020; and

•an increase of $8.9 million from storage services due primarily to higher storage rates; and

•an increase of $4.7 million in transportation services due primarily to higher park-and-loan revenue and higher interruptible transportation revenue in the first quarter 2021, offset partially by a favorable $13.5 million contract settlement in April 2020; offset by

•an increase of $24.9 million in operating costs due primarily to higher employee costs related primarily to short-term incentives, higher outside services and supplies expenses; and

•a decrease of $6.6 million from lower equity in net earnings from investments due primarily to decreased firm transportation revenues on Northern Border Pipeline.

Capital expenditures increased in 2021 due primarily to capital-growth projects.

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	Years Ended December 31,
Operating Information (a)	2021		2020		2019
Natural gas transportation capacity contracted (MDth/d)	7,395		7,461		7,618
Transportation capacity contracted	95	%	96	%	98	%

(a) - Includes volumes for consolidated entities only.

Roadrunner, in which we have a 50% ownership interest, has contracted all of its westbound capacity through 2041.

Northern Border Pipeline, in which we have a 50% ownership interest, has contracted substantially all of its long-haul transportation capacity through the fourth quarter 2022.

In February 2021, our subsidiary, Midwestern Gas Transmission Company (Midwestern), filed a proposed change in rates pursuant to Section 4 of the Natural Gas Act with the FERC. In February 2022, Midwestern filed a Stipulation and Offer of Settlement with the FERC for approval. Pending approval by the FERC, the proposed settlement is not expected to impact materially our results of operations.

NON-GAAP FINANCIAL MEASURES

The following table sets forth a reconciliation of net income, the nearest comparable GAAP financial performance measure, to adjusted EBITDA for the periods indicated:

	Years Ended December 31,
(Unaudited)	2021		2020		2019
Reconciliation of net income to adjusted EBITDA	(Thousands of dollars)
Net income	$	1,499,706	$	612,809	$	1,278,577
Add:
Interest expense, net of capitalized interest	732,924		712,886		491,773
Depreciation and amortization	621,701		578,662		476,535
Income tax expense	484,498		189,507		372,414
Impairment charges	—		644,930		—
Noncash compensation expense (a)	42,592		8,540		26,699
Equity AFUDC and other noncash items	(1,681)		(23,661)		(65,811)
Adjusted EBITDA (b)	$	3,379,740	$	2,723,673	$	2,580,187
Reconciliation of segment adjusted EBITDA to adjusted EBITDA
Segment adjusted EBITDA:
Natural Gas Gathering and Processing	$	889,127	$	650,036	$	702,650
Natural Gas Liquids	1,963,639		1,617,241		1,465,765
Natural Gas Pipelines	527,810		437,426		408,816
Other (b)	(836)		18,970		2,956
Adjusted EBITDA	$	3,379,740	$	2,723,673	$	2,580,187

(a) - Year ended December 31, 2021 and 2020, includes a loss of $7.4 million and a benefit of $11.2 million, respectively, related to the mark-to-market of our share-based deferred compensation plan.

(b) - Year ended December 31, 2020, includes corporate net gains of $22.3 million on extinguishment of debt related to open market repurchases.

CONTINGENCIES

See Note N of the Notes to Consolidated Financial Statements in this Annual Report for a discussion of regulatory and environmental matters.

Other Legal Proceedings - We are a party to various legal proceedings that have arisen in the normal course of our operations. While the results of these proceedings cannot be predicted with certainty, we believe the reasonably possible losses from such proceedings, individually and in the aggregate, are not material. Additionally, we believe the probable final outcome of such proceedings will not have a material adverse effect on our consolidated results of operations, financial position or cash flows.

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LIQUIDITY AND CAPITAL RESOURCES

General - Our primary sources of cash inflows are operating cash flows, proceeds from our commercial paper program and our $2.5 Billion Credit Agreement, debt issuances and the issuance of common stock for our liquidity and capital resources requirements.

We expect our sources of cash inflows to provide sufficient resources to finance our operations, quarterly cash dividends, capital expenditures and maturities of long-term debt. We believe we have sufficient liquidity due to our $2.5 Billion Credit Agreement, which expires in June 2024 and access to $1.0 billion available through our “at-the-market” equity program. As of the date of this report, no shares have been sold through our “at-the-market” equity program.

We may manage interest-rate risk through the use of fixed-rate debt, floating-rate debt and interest-rate swaps. For additional information on our interest-rate swaps, see Note C of the Notes to Consolidated Financial Statements in this Annual Report.

Guarantees and Cash Management - In 2020, the SEC amended Rule 3-10 of Regulation S-X and created Rule 13-01 to simplify disclosure requirements related to certain registered securities. We and ONEOK Partners are issuers of certain public debt securities. We guarantee certain indebtedness of ONEOK Partners, and ONEOK Partners and the Intermediate Partnership guarantee certain of our indebtedness. The guarantees in place for our and ONEOK Partners’ indebtedness are full, irrevocable, unconditional and absolute joint and several guarantees to the holders of each series of outstanding securities. Liabilities under the guarantees rank equally in right of payment with all existing and future senior unsecured indebtedness. As ONEOK Partners and the Intermediate Partnership are consolidated subsidiaries of ONEOK, separate financial statements for the guarantors are not required, as long as the alternative disclosure required by Rule 13-01 is provided, which includes narrative disclosure and summarized financial information. The Intermediate Partnership holds all of ONEOK Partners’ interests and equity in its subsidiaries, which are non-guarantors, and substantially all the assets and operations reside with non-guarantor operating subsidiaries. Therefore, as allowed under Rule 13-01, we have excluded the summarized financial information for each issuer and guarantor as the combined financial information of the subsidiary issuer and parent guarantor, excluding our ownership of all the interests in ONEOK Partners, reflect no material assets, liabilities or results of operations, apart from the guaranteed indebtedness. For additional information on our and ONEOK Partners’ indebtedness, see Note F of the Notes to Consolidated Financial Statements in this Annual Report.

We use a centralized cash management program that concentrates the cash assets of our non-guarantor operating subsidiaries in joint accounts for the purposes of providing financial flexibility and lowering the cost of borrowing, transaction costs and bank fees. Our centralized cash management program provides that funds in excess of the daily needs of our operating subsidiaries are concentrated, consolidated or otherwise made available for use by other entities within our consolidated group. Our operating subsidiaries participate in this program to the extent they are permitted pursuant to FERC regulations or their operating agreements. Under the cash management program, depending on whether a participating subsidiary has short-term cash surpluses or cash requirements, we provide cash to the subsidiary or the subsidiary provides cash to us.

Short-term Liquidity - Our principal sources of short-term liquidity consist of cash generated from operating activities, distributions received from our equity-method investments, proceeds from our commercial paper program and our $2.5 Billion Credit Agreement. As of December 31, 2021, we are in compliance with all covenants of our $2.5 Billion Credit Agreement.

At December 31, 2021, we had no borrowings under our $2.5 Billion Credit Agreement and $146.4 million of cash and cash equivalents.

We had a working capital (defined as current assets less current liabilities) deficit of $810.2 million and a working capital surplus of $525.2 million as of December 31, 2021, and December 31, 2020, respectively. Although working capital is influenced by several factors, including, among other things: (i) the timing of (a) debt and equity issuances, (b) scheduled debt payments, (c) the funding of capital expenditures, and (d) accounts receivable and payable; and (ii) the volume and cost of inventory and commodity imbalances; our working capital deficit at December 31, 2021, was driven primarily by current maturities of long-term debt and our working capital surplus at December 31, 2020, was driven primarily by cash on hand. We may have working capital deficits in future periods as we continue to repay long-term debt. We do not expect this working capital deficit to have an adverse impact to our cash flows or operations.

For additional information on our $2.5 Billion Credit Agreement, see Note F of the Notes to Consolidated Financial Statements in this Annual Report.

Long-term Financing - In addition to our principal sources of short-term liquidity discussed above, we expect to fund our longer-term financing requirements by issuing long-term notes. Other options to obtain financing include, but are not limited

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to, issuing common stock, loans from financial institutions, issuance of convertible debt securities or preferred equity securities, asset securitization and the sale and lease-back of facilities.

Debt Repayments - In November 2021, we redeemed the remaining $536.1 million of our $700 million, 4.25% senior notes due February 2022 at 100% of the principal amount, plus accrued and unpaid interest, with cash on hand and short-term borrowings.

In June 2021, we repaid the remaining $11.7 million of Guardian Pipeline’s senior notes due December 2022 with cash on hand.

In 2021, we repurchased in the open market outstanding principal of certain of our senior notes in the amount of $55.2 million for an aggregate repurchase price of $54.6 million with cash on hand.

Material Commitments - We have material cash commitments related to our capital expenditures, senior notes and corresponding interest payments, which we expect to fund through our sources of cash inflows discussed above. Our senior notes and interest payments are discussed in Note F of the Notes to Consolidated Financial Statements in this Annual Report. We also have cash commitments related to transportation, storage and other commercial contracts, as well as our financial and physical derivative obligations, which we expect to fund with cash from operations.

Capital Expenditures - We classify expenditures that are expected to generate additional revenue, return on investment or significant operating or environmental efficiencies as growth capital expenditures. Maintenance capital expenditures are those capital expenditures required to maintain our existing assets and operations and do not generate additional revenues. Maintenance capital expenditures are made to replace partially or fully depreciated assets, to maintain the existing operating capacity of our assets and to extend their useful lives. Our capital expenditures are financed typically through operating cash flows and short- and long-term debt.

The following table sets forth our growth and maintenance capital expenditures, excluding AFUDC, for the periods indicated:

Capital Expenditures	2021		2020		2019
	(Millions of dollars)
Natural Gas Gathering and Processing	$	275.2	$	446.1	$	926.5
Natural Gas Liquids	306.9		1,655.8		2,796.6
Natural Gas Pipelines	92.6		71.9		99.2
Other	22.2		21.6		26.0
Total capital expenditures	$	696.9	$	2,195.4	$	3,848.3

Total capital expenditures decreased in 2021, compared with 2020, due primarily to our completed capital-growth projects in the prior year. We expect our 2022 capital expenditures to increase relative to 2021 due to our publicly announced capital-growth projects. See discussion of our announced capital-growth projects in the “Recent Developments” section.

We expect total capital expenditures, excluding AFUDC and capitalized interest, of $900-$1,050 million in 2022.

Credit Ratings - Our long-term debt credit ratings as of February 22, 2022, are shown in the table below:

Rating Agency	Long-Term Rating	Short-Term Rating	Outlook
Moody’s	Baa3	Prime-3	Stable
S&P	BBB	A-2	Stable
Fitch	BBB	F2	Stable

Our credit ratings, which are investment grade, may be affected by a material change in our financial ratios or a material event affecting our business and industry. The most common criteria for assessment of our credit ratings are the debt-to-EBITDA ratio, interest coverage, business risk profile and liquidity. If our credit ratings were downgraded, our cost to borrow funds under our $2.5 Billion Credit Agreement could increase and a potential loss of access to the commercial paper market could occur. In the event that we are unable to borrow funds under our commercial paper program and there has not been a material adverse change in our business, we would continue to have access to our $2.5 Billion Credit Agreement, which expires in 2024. An adverse credit rating change alone is not a default under our $2.5 Billion Credit Agreement.

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In the normal course of business, our counterparties provide us with secured and unsecured credit. In the event of a downgrade in our credit ratings or a significant change in our counterparties’ evaluation of our creditworthiness, we could be required to provide additional collateral in the form of cash, letters of credit or other negotiable instruments as a condition of continuing to conduct business with such counterparties. We may be required to fund margin requirements with our counterparties with cash, letters of credit or other negotiable instruments.

Dividends - Holders of our common stock share equally in any common stock dividends declared by our Board of Directors, subject to the rights of the holders of outstanding preferred stock. In 2021, we paid common stock dividends of $3.74 per share, which is consistent with prior year. In February 2022, we paid a quarterly common stock dividend of $0.935 per share ($3.74 per share on an annualized basis), which is consistent with the same quarter in the prior year.

Our Series E Preferred Stock pays quarterly dividends on each share of Series E Preferred Stock, when, as and if declared by our Board of Directors, at a rate of 5.5% per year. In 2021, we paid dividends of $1.1 million for the Series E Preferred Stock. In February 2022, we paid quarterly dividends totaling $0.3 million for the Series E Preferred Stock.

For the year ended December 31, 2021, our cash flows from operations exceeded dividends paid by $878.8 million. We expect our cash flows from operations to continue to sufficiently fund our cash dividends. To the extent operating cash flows are not sufficient to fund our dividends, we may utilize cash on hand from other sources of short- and long-term liquidity to fund a portion of our dividends.

CASH FLOW ANALYSIS

We use the indirect method to prepare our Consolidated Statements of Cash Flows. Under this method, we reconcile net income to cash flows provided by operating activities by adjusting net income for those items that affect net income but do not result in actual cash receipts or payments during the period and for operating cash items that do not impact net income. These reconciling items can include depreciation and amortization, impairment charges, allowance for equity funds used during construction, gain or loss on sale of assets, deferred income taxes, net undistributed earnings from equity-method investments, share-based compensation expense, other amounts and changes in our assets and liabilities not classified as investing or financing activities.

The following table sets forth the changes in cash flows by operating, investing and financing activities for the periods indicated:

	Years Ended December 31,
	2021		2020		2019
	(Millions of dollars)
Total cash provided by (used in):
Operating activities	$	2,546.3	$	1,899.0	$	1,946.8
Investing activities	(665.3)		(2,270.5)		(3,768.8)
Financing activities	(2,259.1)		875.0		1,831.0
Change in cash and cash equivalents	(378.1)		503.5		9.0
Cash and cash equivalents at beginning of period	524.5		21.0		12.0
Cash and cash equivalents at end of period	$	146.4	$	524.5	$	21.0

Operating Cash Flows - Operating cash flows are affected by earnings from our business activities and changes in our operating assets and liabilities. Changes in commodity prices and demand for our services or products, whether because of general economic conditions, changes in supply, changes in demand for the end products that are made with our products or increased competition from other service providers, could affect our earnings and operating cash flows. Our operating cash flows can also be impacted by changes in our NGLs and natural gas inventory balances, which are driven primarily by commodity prices, supply, demand and the operation of our assets.

2021 vs. 2020 - Cash flows from operating activities, before changes in operating assets and liabilities, increased $628.5 million due primarily to higher net income resulting from higher exchange services in our Natural Gas Liquids segment, higher realized prices and increased volumes in our Natural Gas Gathering and Processing segment and natural gas sales in our Natural Gas Pipelines segment, as discussed in “Financial Results and Operating Information.”

The changes in operating assets and liabilities decreased operating cash flows $141.8 million for the year ended December 31, 2021, compared with a decrease of $160.5 million for the same period in 2020. The change is due primarily to changes in accounts payable resulting from the timing of payments to vendors, suppliers and other third parties and changes in commodity

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prices, which vary from period to period; changes in risk-management assets and liabilities, which include a loss in 2020 on the settlement of $750 million of our forward interest-rate swaps related to our March 2020 issuances of senior unsecured notes and changes in the fair value of risk-management assets and liabilities, which vary from period to period and with changes in commodity prices and interest rates; and changes in other assets and liabilities; offset partially by changes in accounts receivable resulting from the timing of receipt of cash from customers and NGLs and natural gas in storage, both of which vary from period to period and with changes in commodity prices.

Investing Cash Flows

2021 vs. 2020 - Cash used in investing activities decreased $1.6 billion due primarily to reduced capital expenditures related to our completed capital-growth projects.

Financing Cash Flows

2021 vs. 2020 - Cash from financing activities decreased $3.1 billion due primarily to the issuances of $3.25 billion in long-term debt and issuance of common stock in 2020, offset partially by repayments of long-term debt of $0.6 billion in 2021 compared with repayments of $1.5 billion in 2020.

Cash Flow Analysis for the Year Ended December 31, 2020 vs. 2019 - The cash flow analysis for the year ended December 31, 2020, compared with the year ended December 31, 2019, is included in Part II, Item 7, Management’s Discussion and Analysis of Financial Condition and Results of Operations of our 2020 Annual Report on Form 10-K, which is available via the SEC’s website at www.sec.gov and our website at www.oneok.com.

IMPACT OF NEW ACCOUNTING STANDARDS

Information about the impact of new accounting standards is included in Note A of the Notes to Consolidated Financial Statements in this Annual Report.

CRITICAL ACCOUNTING POLICIES AND ESTIMATES

The preparation of our Consolidated Financial Statements and related disclosures in accordance with GAAP requires us to make estimates and assumptions with respect to values or conditions that cannot be known with certainty that affect the reported amounts of assets and liabilities, and the disclosure of contingent assets and liabilities at the date of the Consolidated Financial Statements. These estimates and assumptions also affect the reported amounts of revenue and expenses during the reporting period. Although we believe these estimates and assumptions are reasonable, actual results could differ from our estimates.

The following is a summary of our most critical accounting policies and estimates, which are defined as those estimates and policies most important to the portrayal of our financial condition and results of operations and requiring management’s most difficult, subjective or complex judgment, particularly because of the need to make estimates concerning the impact of inherently uncertain matters. We have discussed the development and selection of our estimates and critical accounting policies with the Audit Committee of our Board of Directors. See Note A of the Notes to Consolidated Financial Statements in this Annual Report for the description of our accounting policies and additional information about our critical accounting policies and estimates.

Derivatives and Risk-management Activities - We utilize derivatives to reduce our market-risk exposure to commodity price and interest-rate fluctuations and to achieve more predictable cash flows. Our commodity price risk includes basis risk, which is the difference in price between various locations where commodities are purchased and sold. We record all derivative instruments at fair value, except for normal purchases and normal sales transactions that are expected to result in physical delivery. Many of the contracts in our derivative portfolio are executed in liquid markets where price transparency exists.

Our commodity derivatives are generally valued using quoted prices published by an exchange. Our fair value measurements classified as Level 3 are composed predominantly of exchange-cleared and over-the-counter derivatives to hedge NGL price risk at certain market locations. These measurements are based on inputs that may include one or more unobservable inputs, including internally developed commodity price curves, that incorporate market data from broker quotes and third-party pricing services. We believe any measurement uncertainty at December 31, 2021, is immaterial as our Level 3 fair value measurements are based on unadjusted pricing information from broker quotes and third-party pricing services.

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The accounting for changes in the fair value of a derivative instrument depends on whether it qualifies and has been designated as part of a hedging relationship. When possible, we implement effective hedging strategies using derivative financial instruments that qualify as hedges for accounting purposes. We have not used derivative instruments for trading purposes. For a derivative designated as a cash flow hedge, the gain or loss from a change in fair value of the derivative instrument is deferred in accumulated other comprehensive loss until the forecasted transaction affects earnings, at which time the fair value of the derivative instrument is reclassified into earnings.

We assess hedging relationships at the inception of the hedge and on an ongoing basis to determine whether the hedging relationship is, and is expected to remain, highly effective. We do not believe that changes in our fair value estimates of our derivative instruments have a material impact on our results of operations, as the majority of our derivatives are accounted for as effective cash flow hedges. However, if a derivative instrument is ineligible for cash flow hedge accounting or if we fail to appropriately designate it as a cash flow hedge, changes in fair value of the derivative instrument would be recorded in earnings. Additionally, if a cash flow hedge ceases to qualify for hedge accounting treatment because it is no longer probable that the forecasted transaction will occur, the change in fair value of the derivative instrument would be recognized in earnings. For more information on commodity price sensitivity and a discussion of the market risk of pricing changes, see Item 7A, Quantitative and Qualitative Disclosures about Market Risk.

See Notes A, B and C of the Notes to Consolidated Financial Statements in this Annual Report for additional discussion of fair value measurements and derivatives and risk-management activities.

Impairment of Goodwill and Long-Lived Assets, Including Intangible Assets - We assess our goodwill for impairment at least annually as of July 1, unless events or changes in circumstances indicate an impairment may have occurred before that time. As part of our goodwill impairment test, we may first assess qualitative factors (including macroeconomic conditions, industry and market considerations, cost factors and overall financial performance) to determine whether it is more likely than not that the fair value of each of our reporting units is less than its carrying amount. If further testing is necessary or a quantitative test is elected, we perform a Step 1 analysis for goodwill impairment.

In a Step 1 analysis, an assessment is made by comparing the fair value of a reporting unit with its carrying amount, including goodwill. If the carrying value of a reporting unit exceeds its fair value, an impairment loss is recognized in an amount equal to that excess, limited to the total amount of goodwill allocated to that reporting unit.

Our impairment tests require the use of assumptions and estimates, such as industry economic factors and the profitability of future business strategies. To estimate the fair value of these assets and investments, we use two generally accepted valuation approaches, an income approach and a market approach. Under the income approach, our discounted cash flow analysis includes the following inputs that are not readily available: a discount rate reflective of industry cost of capital, our estimated contract rates, volumes, operating margins, operating and maintenance costs and capital expenditures. Under the market approach, our inputs include EBITDA multiples, which are estimated from recent peer acquisition transactions, and forecasted EBITDA, which incorporates inputs similar to those used under the income approach. If actual results are not consistent with our assumptions and estimates or our assumptions and estimates change due to new information, we may be exposed to future impairment charges.

See Notes A, D, E and M of the Notes to Consolidated Financial Statements in this Annual Report for additional discussion of goodwill, long-lived assets and investments in unconsolidated affiliates.

Depreciation Methods and Estimated Useful Lives of Property, Plant and Equipment - Our property, plant and equipment are depreciated using the straight-line method that incorporates management assumptions regarding useful economic lives and residual values. As we place additional assets in service, our estimates related to depreciation expense have become more significant and changes in estimated useful lives of our assets could have a material effect on our results of operations. At the time we place our assets in service, we believe such assumptions are reasonable; however, circumstances may develop that would cause us to change these assumptions, which would change our depreciation expense prospectively. Examples of such circumstances include changes in (i) competition, (ii) laws and regulations that limit the estimated economic life of an asset, (iii) technology that render an asset obsolete, (iv) expected salvage values and (v) forecasts of the remaining economic life for the resource basins where our assets are located, if any. For the fiscal years presented in this Form 10-K, no changes were made to the determinations of useful lives that would have a material effect on the timing of depreciation expense in future periods.

See Note D of the Notes to Consolidated Financial Statements in this Annual Report for additional discussion of property, plant and equipment.

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FORWARD-LOOKING STATEMENTS

Some of the statements contained and incorporated in this Annual Report are forward-looking statements as defined under federal securities laws. The forward-looking statements relate to our anticipated financial performance (including projected operating income, net income, capital expenditures, cash flows and projected levels of dividends), liquidity, management’s plans and objectives for our future capital-growth projects and other future operations (including plans to construct additional natural gas and NGL pipelines, processing and fractionation facilities and related cost estimates), our business prospects, the outcome of regulatory and legal proceedings, market conditions and other matters. We make these forward-looking statements in reliance on the safe harbor protections provided under federal securities legislation and other applicable laws. The following discussion is intended to identify important factors that could cause future outcomes to differ materially from those set forth in the forward-looking statements.

Forward-looking statements include the items identified in the preceding paragraph, the information concerning possible or assumed future results of our operations and other statements contained or incorporated in this Annual Report identified by words such as “anticipate,” “believe,” “continue,” “could,” “estimate,” “expect,” “forecast,” “goal,” “target,” “guidance,” “intend,” “may,” “might,” “outlook,” “plan,” “potential,” “project,” “scheduled,” “should,” “will,” “would,” and other words and terms of similar meaning.

One should not place undue reliance on forward-looking statements. Known and unknown risks, uncertainties and other factors may cause our actual results, performance or achievements to be materially different from any future results, performance or achievements expressed or implied by forward-looking statements. Those factors may affect our operations, markets, products, services and prices. In addition to any assumptions and other factors referred to specifically in connection with the forward-looking statements, factors that could cause our actual results to differ materially from those contemplated in any forward-looking statement include, among others, the following:

•the length, severity and reemergence of a pandemic or other health crisis, such as the COVID-19 pandemic and the measures that international, federal, state and local governments, agencies, law enforcement and/or health authorities implement to address it, which may (as with COVID-19) precipitate or exacerbate one or more of the factors herein, reduce the demand for natural gas, NGLs and crude oil and significantly disrupt or prevent us and our customers and counterparties from operating in the ordinary course for an extended period and increase the cost of operating our business;

•operational challenges relating to the COVID-19 pandemic and efforts to mitigate the spread of the virus, including logistical challenges, protecting the health and well-being of our employees, remote work arrangements, performance of contracts and supply chain disruption;

•the impact on drilling and production by factors beyond our control, including the demand for natural gas and crude oil; producers’ desire and ability to drill and obtain necessary permits; regulatory compliance; reserve performance; and capacity constraints and/or shut downs on the pipelines that transport crude oil, natural gas and NGLs from producing areas and our facilities;

•risks associated with adequate supply to our gathering, processing, fractionation and pipeline facilities, including production declines that outpace new drilling, the shutting-in of production by producers, actions taken by federal, state or local governments to require producers to prorate or to cut their production levels as a way to address any excess market supply situations or extended periods of ethane rejection;

•demand for our services and products in the proximity of our facilities;

•economic climate and growth in the geographic areas in which we operate;

•the risk of a slowdown in growth or decline in the United States or international economies, including liquidity risks in United States or foreign credit markets;

•performance of contractual obligations by our customers, service providers, contractors and shippers;

•the effects of changes in governmental policies and regulatory actions, including changes with respect to income and other taxes, pipeline safety, environmental compliance, cybersecurity, climate change initiatives, emissions credits, carbon offsets, carbon pricing, production limits and authorized rates of recovery of natural gas and natural gas transportation costs;

•changes in demand for the use of natural gas, NGLs and crude oil because of the development of new technologies or other market conditions caused by concerns about climate change;

•the transition to a lower-carbon economy, including the timing and extent of the transition, as well as the expected role of different energy sources in such a transition;

•the pace of technological advancements and industry innovation, including those focused on reducing GHG emissions and advancing other climate-related initiatives, and our ability to take advantage of those innovations and developments;

•the effectiveness of our risk-management strategies, including mitigating cyber- and climate-related risks;

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•our ability to identify and execute opportunities, and the economic viability of those opportunities, including those relating to renewable natural gas, carbon capture, use and storage, other renewable energy sources such as solar and wind and alternative low carbon fuel sources such as hydrogen;

•the ability of our existing assets and our ability to apply and continue to develop our expertise to support the growth of, and transition to, various renewable and alternative energy opportunities, including through the positioning and optimization of our assets;

•our ability to efficiently reduce the carbon intensity of our operations (both Scope 1 and 2 emissions), including through the use of lower carbon power alternatives, management practices and system optimizations;

•the necessity to direct our focus on maintaining and enhancing our existing assets instead of efforts to reduce our GHG emissions;

•the effects of weather and other natural phenomena, including climate change, on our operations, demand for our services and energy prices;

•acts of nature, sabotage, terrorism or other similar acts that cause damage to our facilities or our suppliers’, customers’ or shippers’ facilities;

•the possibility of future terrorist attacks or the possibility or occurrence of an outbreak of, or changes in, hostilities or changes in the political conditions throughout the world;

•the risk of increased costs for insurance premiums, security or other items as a consequence of terrorist attacks;

•the timing and extent of changes in energy commodity prices, including changes due to production decisions by other countries, such as the failure of countries to abide by agreements to reduce production volumes;

•competition from other United States and foreign energy suppliers and transporters, as well as alternative forms of energy, including, but not limited to, solar power, wind power, geothermal energy and biofuels such as ethanol and biodiesel;

•the ability to market pipeline capacity on favorable terms, including the effects of:

–    future demand for and prices of natural gas, NGLs and crude oil;

–    competitive conditions in the overall energy market;

–    availability of supplies of United States natural gas and crude oil; and

–    availability of additional storage capacity;

•the efficiency of our plants in processing natural gas and extracting and fractionating NGLs;

•the composition and quality of the natural gas and NGLs we gather and process in our plants and transport on our pipelines;

•risks of marketing, trading and hedging activities, including the risks of changes in energy prices or the financial condition of our counterparties;

•our ability to control operating costs and make cost-saving changes;

•the risk inherent in the use of information systems in our respective businesses and those of our counterparties and service providers, including cyber-attacks, which, according to experts, have increased in volume and sophistication since the beginning of the COVID-19 pandemic; implementation of new software and hardware; and the impact on the timeliness of information for financial reporting;

•the timely receipt of approval by applicable governmental entities for construction and operation of our pipeline and other projects and required regulatory clearances;

•the ability to recover operating costs and amounts equivalent to income taxes, costs of property, plant and equipment and regulatory assets in our state and FERC-regulated rates;

•the results of governmental actions, administrative proceedings and litigation, regulatory actions, executive orders, rule changes and receipt of expected clearances involving any local, state or federal regulatory body, including the FERC, the National Transportation Safety Board, Homeland Security, the PHMSA, the EPA and the CFTC;

•the mechanical integrity of facilities and pipelines operated;

•the capital-intensive nature of our businesses;

•the impact of unforeseen changes in interest rates, debt and equity markets, inflation rates, economic recession and other external factors over which we have no control, including the effect on pension and postretirement expense and funding resulting from changes in equity and bond market returns;

•actions by rating agencies concerning our credit;

•our indebtedness and guarantee obligations could make us vulnerable to general adverse economic and industry conditions, limit our ability to borrow additional funds and/or place us at competitive disadvantages compared with our competitors that have less debt or have other adverse consequences;

•our ability to access capital at competitive rates or on terms acceptable to us;

•our ability to acquire all necessary permits, consents or other approvals in a timely manner, to promptly obtain all necessary materials and supplies required for construction, and to construct gathering, processing, storage, fractionation and transportation facilities without labor or contractor problems;

•our ability to control construction costs and completion schedules of our pipelines and other projects;

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•difficulties or delays experienced by trucks, railroads or pipelines in delivering products to or from our terminals or pipelines;

•the uncertainty of estimates, including accruals and costs of environmental remediation;

•the impact of uncontracted capacity in our assets being greater or less than expected;

•the impact of potential impairment charges;

•the profitability of assets or businesses acquired or constructed by us;

•risks associated with pending or possible acquisitions and dispositions, including our ability to finance or integrate any such acquisitions and any regulatory delay or conditions imposed by regulatory bodies in connection with any such acquisitions and dispositions;

•the risk that material weaknesses or significant deficiencies in our internal controls over financial reporting could emerge or that minor problems could become significant;

•the impact and outcome of pending and future litigation;

•the impact of recently issued and future accounting updates and other changes in accounting policies; and

•the risk factors listed in the reports we have filed and may file with the SEC, which are incorporated by reference.

These factors are not necessarily all of the important factors that could cause actual results to differ materially from those expressed in any of our forward-looking statements. Other factors could also affect adversely our future results. These and other risks are described in greater detail in Part I, Item 1A, Risk Factors, in this Annual Report and in our other filings that we make with the SEC, which are available via the SEC’s website at www.sec.gov and our website at www.oneok.com. All forward-looking statements attributable to us or persons acting on our behalf are expressly qualified in their entirety by these factors. Any such forward-looking statement speaks only as of the date on which such statement is made, and other than as required under securities laws, we undertake no obligation to update publicly any forward-looking statement whether as a result of new information, subsequent events or change in circumstances, expectations or otherwise.

ITEM 7A.    QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

Our exposure to market risk discussed below includes forward-looking statements and represents an estimate of possible changes in future earnings that could occur assuming hypothetical future movements in interest rates or commodity prices. Our views on market risk are not necessarily indicative of actual results that may occur and do not represent the maximum possible gains and losses that may occur since actual gains and losses will differ from those estimated based on actual fluctuations in interest rates or commodity prices and the timing of transactions.

We are exposed to market risk due to commodity price and interest-rate volatility. Market risk is the risk of loss arising from adverse changes in market rates and prices. We may use financial instruments, including forward sales, swaps, options and futures, to manage the risks of certain identifiable or anticipated transactions and achieve more predictable cash flows. Our risk-management function follows policies and procedures established by our Risk Oversight and Strategy Committee to monitor our natural gas, condensate and NGL marketing activities and interest rates to ensure our hedging activities mitigate market risks and comply with approved thresholds or limits. We do not use financial instruments for trading purposes.

We utilize a sensitivity analysis model to assess the risk associated with our derivative portfolio. The sensitivity analysis measures the potential change in fair value of our derivative instruments based upon a hypothetical 10% movement in the underlying commodity prices or interest rates. In addition to these variables, the fair value of our derivative portfolio is influenced by fluctuations in the notional amounts of the instruments and the discount rates used to determine the present values. Because we enter into these derivative instruments for the purpose of mitigating the risks that accompany certain of our business activities, as described below, the change in the market value of our derivative portfolio would typically be offset largely by a corresponding gain or loss on the hedged item.

See Note A of the Notes to Consolidated Financial Statements in this Annual Report for discussion on our accounting policies for our derivative instruments and the impact on our Consolidated Financial Statements.

COMMODITY PRICE RISK

As part of our hedging strategy, we use commodity derivative financial instruments and physical-forward contracts described in Note C of the Notes to Consolidated Financial Statements in this Annual Report to reduce the impact of near-term price fluctuations of natural gas, NGLs and condensate.

Although our businesses are primarily fee-based, in our Natural Gas Gathering and Processing segment, we are exposed to commodity price risk as a result of retaining a portion of the commodity sales proceeds associated with our fee with POP contracts. Under certain fee with POP contracts, our contractual fees and POP percentage may increase or decrease if

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production volumes, delivery pressures or commodity prices change relative to specified thresholds. In certain commodity price environments, our contractual fees on these fee with POP contracts may decrease, which would impact the average fee rate in our Natural Gas Gathering and Processing segment. We are exposed to basis risk between the various production and market locations where we buy and sell commodities.

The following table presents the effect a hypothetical 10% change in the underlying commodity prices would have on the estimated fair value of our commodity derivative instruments as of the dates indicated:

Commodity Contracts	December 31, 2021		December 31, 2020
	(Millions of dollars)
Crude oil and NGLs	$	40.6	$	20.0
Natural gas	11.5		10.6
Total change in estimated fair value of commodity contracts	$	52.1	$	30.6

Our sensitivity analysis represents an estimate of the reasonably possible gains and losses that would be recognized on our commodity derivative contracts assuming hypothetical movements in future market prices and is not necessarily indicative of actual results that may occur. Actual gains and losses may differ from estimates due to actual fluctuations in market prices, as well as changes in our commodity derivative portfolio during the year.

The following tables set forth hedging information for our Natural Gas Gathering and Processing segment’s forecasted equity volumes for the periods indicated:

	Year Ending December 31, 2022
	Volumes Hedged	Average Price			Percentage Hedged
NGLs - excluding ethane (MBbl/d) - Conway/Mont Belvieu	11.7	$	0.96	/ gallon	69%
Condensate (MBbl/d) - WTI-NYMEX	1.6	$	63.10	/ Bbl	72%
Natural gas (BBtu/d) - NYMEX and basis	109.5	$	3.27	/ MMBtu	75%

	Year Ending December 31, 2023
	Volumes Hedged	Average Price			Percentage Hedged
NGLs - excluding ethane (MBbl/d) - Conway/Mont Belvieu	0.9	$	1.11	/ gallon	5%
Condensate (MBbl/d) - WTI-NYMEX	0.2	$	74.95	/ Bbl	7%
Natural gas (BBtu/d) - NYMEX and basis	17.3	$	5.06	/ MMBtu	11%

Our Natural Gas Gathering and Processing segment’s commodity price sensitivity is estimated as a hypothetical change in the price of NGLs, crude oil and natural gas at December 31, 2021. Condensate sales are typically based on the price of crude oil. Assuming normal operating conditions, we estimate the following for our forecasted equity volumes:

•a $0.01 per gallon change in the composite price of NGLs, excluding ethane, would change adjusted EBITDA for the years ending December 31, 2022 and 2023, by $2.6 million and $2.7 million, respectively;

•a $1.00 per barrel change in the price of crude oil would change adjusted EBITDA for the years ending December 31, 2022 and 2023, by $0.8 million and $0.9 million, respectively; and

•a $0.10 per MMBtu change in the price of residue natural gas would change adjusted EBITDA for the years ending December 31, 2022 and 2023, by $5.3 million and $5.5 million, respectively.

These estimates do not include any effects of hedging or effects on demand for our services or natural gas processing plant operations that might be caused by, or arise in conjunction with, commodity price fluctuations. For example, a change in the gross processing spread may cause a change in the amount of ethane extracted from the natural gas stream, impacting gathering and processing financial results for certain contracts.

INTEREST-RATE RISK

We are exposed to interest-rate risk through borrowings under our $2.5 Billion Credit Agreement, commercial paper program and long-term debt issuances. Future increases in commercial paper rates or bond rates could expose us to increased interest costs on future borrowings. We may manage interest-rate risk through the use of fixed-rate debt, floating-rate debt and interest-

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rate swaps. Interest-rate swaps are agreements to exchange interest payments at some future point based on specified notional amounts.

At December 31, 2021 and 2020, we had forward-starting interest-rate swaps with notional amounts totaling $1.1 billion to hedge the variability of interest payments on a portion of our forecasted debt issuances. All of our interest-rate swaps are designated as cash flow hedges. At December 31, 2021 and 2020, we had derivative liabilities of $145.5 million and $203.4 million, respectively, related to these interest-rate swaps.

The following table presents the effect of a 10% hypothetical change in interest rates on the estimated fair value of our interest-rate derivative instruments as of the dates indicated:

	December 31, 2021		December 31, 2020
	(Millions of dollars)
Forward-starting interest-rate swaps	$	19.6	$	12.9

Our sensitivity analysis represents an estimate of the reasonably possible gains and losses that would be recognized on our interest-rate derivative contracts assuming hypothetical movements in future interest rates and is not necessarily indicative of actual results that may occur. Actual gains and losses may differ from estimates due to actual fluctuations in interest rates, as well as changes in our interest-rate derivative portfolio during the year.

See Note C of the Notes to Consolidated Financial Statements in this Annual Report for more information on our hedging activities.

COUNTERPARTY CREDIT RISK

We assess the creditworthiness of our counterparties on an ongoing basis and require security, including prepayments and other forms of collateral, when appropriate. Certain of our counterparties may be impacted by a relatively low commodity price environment and could experience financial problems, which could result in nonpayment and/or nonperformance, which could impact adversely our results of operations.

Natural Gas Gathering and Processing - Our Natural Gas Gathering and Processing segment derives services revenue primarily from major and independent crude oil and natural gas producers, which include both large integrated and independent exploration and production companies. In this segment, our downstream commodity sales customers are primarily utilities, large industrial companies, marketing companies and our NGL affiliate. We are not typically exposed to material credit risk with producers under fee with POP contracts as we sell the commodities and remit a portion of the sales proceeds back to the producer less our contractual fees. In 2021 and 2020, approximately 90% of the downstream commodity sales in our Natural Gas Gathering and Processing segment were made to customers rated investment-grade by S&P, approved through comparable internal counterparty analysis, or were secured by letters of credit or other collateral.

Natural Gas Liquids - Our Natural Gas Liquids segment’s counterparties are primarily NGL and natural gas gathering and processing companies; major and independent crude oil and natural gas production companies; utilities; large industrial companies; natural gasoline distributors; propane distributors; municipalities; and petrochemical, refining and marketing companies. We charge fees to NGL and natural gas gathering and processing counterparties and NGL pipeline transportation customers. We are not typically exposed to material credit risk on the majority of our exchange services fees, as we purchase NGLs from our gathering and processing counterparties and deduct our fee from the amounts we remit. We also earn sales revenue on the downstream sales of NGL products. In 2021 and 2020, approximately 70% and 75%, respectively, of this segment’s commodity sales were made to customers rated investment-grade by S&P, approved through comparable internal counterparty analysis, or were secured by letters of credit or other collateral. In addition, the majority of our Natural Gas Liquids segment’s pipeline tariffs provide us the ability to require security from shippers.

Natural Gas Pipelines - Our Natural Gas Pipelines segment’s customers are primarily local natural gas distribution companies, electric-generation facilities, large industrial companies, municipalities, producers, processors and marketing companies. In 2021 and 2020, approximately 85% of our revenues in this segment were from customers rated investment-grade by S&P, approved through comparable internal counterparty analysis, or were secured by letters of credit or other collateral. In addition, the majority of our Natural Gas Pipelines segment’s pipeline tariffs provide us the ability to require security from shippers.

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ITEM 8.    FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA

Report of Independent Registered Public Accounting Firm

To the Board of Directors and Shareholders of ONEOK, Inc.

Opinions on the Financial Statements and Internal Control over Financial Reporting

We have audited the accompanying consolidated balance sheets of ONEOK, Inc. and its subsidiaries (the “Company”) as of December 31, 2021 and 2020, and the related consolidated statements of income, of comprehensive income, of changes in equity and of cash flows for each of the three years in the period ended December 31, 2021, including the related notes (collectively referred to as the “consolidated financial statements”). We also have audited the Company’s internal control over financial reporting as of December 31, 2021, based on criteria established in Internal Control - Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO).

In our opinion, the consolidated financial statements referred to above present fairly, in all material respects, the financial position of the Company as of December 31, 2021 and 2020, and the results of its operations and its cash flows for each of the three years in the period ended December 31, 2021, in conformity with accounting principles generally accepted in the United States of America. Also in our opinion, the Company maintained, in all material respects, effective internal control over financial reporting as of December 31, 2021, based on criteria established in Internal Control - Integrated Framework (2013) issued by the COSO.

Basis for Opinions

The Company’s management is responsible for these consolidated financial statements, for maintaining effective internal control over financial reporting, and for its assessment of the effectiveness of internal control over financial reporting, included in Management’s Report on Internal Control Over Financial Reporting appearing under Item 9A. Our responsibility is to express opinions on the Company’s consolidated financial statements and on the Company’s internal control over financial reporting based on our audits. We are a public accounting firm registered with the Public Company Accounting Oversight Board (United States) (PCAOB) and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audits to obtain reasonable assurance about whether the consolidated financial statements are free of material misstatement, whether due to error or fraud, and whether effective internal control over financial reporting was maintained in all material respects.

Our audits of the consolidated financial statements included performing procedures to assess the risks of material misstatement of the consolidated financial statements, whether due to error or fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidence regarding the amounts and disclosures in the consolidated financial statements. Our audits also included evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overall presentation of the consolidated financial statements. Our audit of internal control over financial reporting included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, and testing and evaluating the design and operating effectiveness of internal control based on the assessed risk. Our audits also included performing such other procedures as we considered necessary in the circumstances. We believe that our audits provide a reasonable basis for our opinions.

Definition and Limitations of Internal Control over Financial Reporting

A company’s internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. A company’s internal control over financial reporting includes those policies and procedures that (i) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (ii) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors of the company; and (iii) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the company’s assets that could have a material effect on the financial statements.

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Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

Critical Audit Matter

The critical audit matter communicated below is a matter arising from the current period audit of the consolidated financial statements that was communicated or required to be communicated to the audit committee and that (i) relates to accounts or disclosures that are material to the consolidated financial statements and (ii) involved our especially challenging, subjective, or complex judgments. The communication of critical audit matters does not alter in any way our opinion on the consolidated financial statements, taken as a whole, and we are not, by communicating the critical audit matter below, providing a separate opinion on the critical audit matter or on the accounts or disclosures to which it relates.

Valuation of Level 3 Commodity Derivative Assets and Liabilities

As described in Notes A and B to the consolidated financial statements, the Company’s level 3 commodity contracts derivative assets and liabilities total $9.3 million and $123.6 million, respectively, as of December 31, 2021. As disclosed by management, commodity price risk includes basis risk, which is the difference in price between various locations where commodities are purchased and sold. Management records all derivative instruments at fair value, with the exception of normal purchases and normal sales transactions that are expected to result in physical delivery. Many of the contracts in its derivative portfolio are executed in liquid markets where price transparency exists. Fair value measurements classified as Level 3 are composed predominantly of exchange-cleared and over-the-counter derivatives to hedge NGL price risk. These measurements are based on inputs that may include one or more unobservable inputs, including internally developed commodity price curves, that incorporate market data from broker quotes and third-party pricing services. The commodity derivatives are generally valued using forward quotes provided by third-party pricing services that are validated with other market data.

The principal considerations for our determination that performing procedures relating to the valuation of level 3 commodity derivative assets and liabilities is a critical audit matter are (i) the significant judgment by management to determine the fair value of these derivatives; (ii) a high degree of auditor judgment, subjectivity and effort in evaluating audit evidence related to the valuation due to the use of internally developed commodity price curves that incorporate market data from broker quotes and third-party pricing services; and (iii) the audit effort involved the use of professionals with specialized skill and knowledge.

Addressing the matter involved performing procedures and evaluating audit evidence in connection with forming our overall opinion on the consolidated financial statements. These procedures included testing the effectiveness of controls relating to the valuation of level 3 commodity derivative assets and liabilities, including controls over the Company’s model, significant assumptions, and data. These procedures also included, among others, the involvement of professionals with specialized skill and knowledge to assist in developing an independent estimate of the level 3 commodity derivative assets and liabilities and comparison of the independent estimate to management’s estimate to evaluate the reasonableness of management’s estimate. Developing the independent estimate involved testing the completeness and accuracy of data provided by management and evaluating management’s assumptions related to the internally developed commodity price curves which incorporate market data from broker quotes and third-party pricing services.

/s/ PricewaterhouseCoopers LLP

Tulsa, Oklahoma

March 1, 2022

We have served as the Company’s auditor since 2007.

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ONEOK, Inc. and Subsidiaries
CONSOLIDATED STATEMENTS OF INCOME
	Years Ended December 31,
	2021		2020		2019
	(Thousands of dollars, except per share amounts)
Revenues
Commodity sales	$	15,180,264	$	7,255,259	$	8,916,047
Services	1,360,045		1,286,983		1,248,320
Total revenues (Note P)	16,540,309		8,542,242		10,164,367
Cost of sales and fuel (exclusive of items shown separately below)	12,256,655		5,110,146		6,788,040
Operations and maintenance	900,420		761,176		863,708
Depreciation and amortization	621,701		578,662		476,535
Impairment charges (Notes D and E)	—		607,200		—
General taxes	166,668		125,028		119,156
(Gain) loss on sale of assets	(1,394)		(1,327)		2,575
Operating income	2,596,259		1,361,357		1,914,353
Equity in net earnings from investments (Note M)	122,520		143,241		154,541
Impairment of equity investments (Note M)	—		(37,730)		—
Allowance for equity funds used during construction	1,682		23,662		64,815
Other income (expense)	(3,333)		24,672		9,055
Interest expense (net of capitalized interest of $25,150, $75,436 and $107,275, respectively)	(732,924)		(712,886)		(491,773)
Income before income taxes	1,984,204		802,316		1,650,991
Income taxes (Note L)	(484,498)		(189,507)		(372,414)
Net income	1,499,706		612,809		1,278,577
Less: Preferred stock dividends	1,100		1,100		1,100
Net income available to common shareholders	$	1,498,606	$	611,709	$	1,277,477
Basic EPS (Note I)	$	3.36	$	1.42	$	3.09
Diluted EPS (Note I)	$	3.35	$	1.42	$	3.07
Average shares (thousands)
Basic	446,403		431,105		413,560
Diluted	447,403		431,782		415,444

See accompanying Notes to Consolidated Financial Statements.

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ONEOK, Inc. and Subsidiaries
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
	Years Ended December 31,
	2021		2020		2019
	(Thousands of dollars)
Net income	$	1,499,706	$	612,809	$	1,278,577
Other comprehensive income (loss), net of tax
Change in fair value of derivatives, net of tax of $60,896, $49,292 and $44,149, respectively	(203,868)		(165,023)		(147,803)
Derivative amounts reclassified to net income, net of tax of $(69,134), $(6,313) and $6,058, respectively	228,999		21,097		(21,057)
Change in retirement and other postretirement benefit plan obligations, net of tax of $(14,929), $7,812 and $2,910, respectively	49,976		(26,154)		(9,696)
Other comprehensive income (loss) of unconsolidated affiliates, net of tax of $(1,490), $2,201 and $2,152, respectively	4,991		(7,369)		(7,205)
Total other comprehensive income (loss), net of tax	80,098		(177,449)		(185,761)
Comprehensive income	$	1,579,804	$	435,360	$	1,092,816

See accompanying Notes to Consolidated Financial Statements.

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ONEOK, Inc. and Subsidiaries
CONSOLIDATED BALANCE SHEETS
	December 31,		December 31,
	2021		2020
Assets	(Thousands of dollars)
Current assets
Cash and cash equivalents	$	146,391	$	524,496
Accounts receivable, net	1,441,786		829,796
Materials and supplies	153,019		143,178
NGLs and natural gas in storage	427,880		227,810
Commodity imbalances	39,609		11,959
Other current assets	165,689		132,536
Total current assets	2,374,374		1,869,775
Property, plant and equipment
Property, plant and equipment	23,820,539		23,072,935
Accumulated depreciation and amortization	4,500,665		3,918,007
Net property, plant and equipment (Note D)	19,319,874		19,154,928
Investments and other assets
Investments in unconsolidated affiliates (Note M)	797,613		805,032
Goodwill and net intangible assets (Note E)	763,295		773,723
Other assets	366,457		475,296
Total investments and other assets	1,927,365		2,054,051
Total assets	$	23,621,613	$	23,078,754

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ONEOK, Inc. and Subsidiaries
CONSOLIDATED BALANCE SHEETS
(Continued)
	December 31,		December 31,
	2021		2020
Liabilities and equity	(Thousands of dollars)
Current liabilities
Current maturities of long-term debt (Note F)	$	895,814	$	7,650
Accounts payable	1,332,391		719,302
Commodity imbalances	309,054		186,372
Accrued taxes	97,537		89,428
Accrued interest	235,602		245,153
Operating lease liability (Note O)	13,783		13,610
Other current liabilities	300,438		83,032
Total current liabilities	3,184,619		1,344,547
Long-term debt, excluding current maturities (Note F)	12,747,636		14,228,421
Deferred credits and other liabilities
Deferred income taxes (Note L)	1,166,690		669,697
Operating lease liability (Note O)	75,636		87,610
Other deferred credits	431,869		706,081
Total deferred credits and other liabilities	1,674,195		1,463,388
Commitments and contingencies (Note N)
Equity (Note G)
ONEOK shareholders’ equity:
Preferred stock, $0.01 par value: authorized and issued 20,000 shares at December 31, 2021, and at December 31, 2020	—		—
Common stock, $0.01 par value: authorized 1,200,000,000 shares; issued 474,916,234 shares and outstanding 446,138,177 shares at December 31, 2021; issued 474,916,234 shares and outstanding 444,872,383 shares at December 31, 2020	4,749		4,749
Paid-in capital	7,213,861		7,353,396
Accumulated other comprehensive loss (Note H)	(471,351)		(551,449)
Retained earnings	—		—
Treasury stock, at cost: 28,778,057 shares at December 31, 2021, and 30,043,851 shares at December 31, 2020	(732,096)		(764,298)
Total equity	6,015,163		6,042,398
Total liabilities and equity	$	23,621,613	$	23,078,754

See accompanying Notes to Consolidated Financial Statements.

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ONEOK, Inc. and Subsidiaries
CONSOLIDATED STATEMENTS OF CASH FLOWS
	Years Ended December 31,
	2021		2020		2019
	(Thousands of dollars)
Operating activities
Net income	$	1,499,706	$	612,809	$	1,278,577
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	621,701		578,662		476,535
Impairment charges	—		644,930		—
Equity in net earnings from investments	(122,520)		(143,241)		(154,541)
Distributions received from unconsolidated affiliates	123,010		144,352		163,476
Deferred income tax expense	472,057		186,730		372,729
Other, net	94,091		35,327		(26,101)
Changes in assets and liabilities:
Accounts receivable	(610,531)		(1,297)		(19,688)
NGLs and natural gas in storage, net of commodity imbalances	(105,038)		172,316		(10,193)
Accounts payable	622,425		(80,257)		(62,946)
Risk-management assets and liabilities	(93,713)		(187,458)		(86,268)
Other assets and liabilities, net	45,084		(63,805)		15,199
Cash provided by operating activities	2,546,272		1,899,068		1,946,779
Investing activities
Capital expenditures (less allowance for equity funds used during construction)	(696,854)		(2,195,381)		(3,848,349)
Distributions received from unconsolidated affiliates in excess of cumulative earnings	19,363		31,808		94,168
Other, net	12,199		(106,956)		(14,577)
Cash used in investing activities	(665,292)		(2,270,529)		(3,768,758)
Financing activities
Dividends paid	(1,667,431)		(1,605,366)		(1,457,628)
Borrowing (repayment) of short-term borrowings, net	—		(220,000)		220,000
Issuance of long-term debt, net of discounts	—		3,244,777		4,185,435
Repayment of long-term debt	(604,894)		(1,457,222)		(1,057,348)
Issuance of common stock	32,791		969,759		29,040
Other	(19,551)		(56,949)		(88,537)
Cash provided by (used in) financing activities	(2,259,085)		874,999		1,830,962
Change in cash and cash equivalents	(378,105)		503,538		8,983
Cash and cash equivalents at beginning of period	524,496		20,958		11,975
Cash and cash equivalents at end of period	$	146,391	$	524,496	$	20,958
Supplemental cash flow information:
Cash paid for interest, net of amounts capitalized	$	691,897	$	760,984	$	435,165
Cash paid for income taxes, net of refunds	$	8,864	$	342	$	2,690

See accompanying Notes to Consolidated Financial Statements.

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ONEOK, Inc. and Subsidiaries
CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY
	Preferred Stock Issued	Common Stock Issued	Preferred Stock		Common Stock		Paid-in Capital
	(Shares)		(Thousands of dollars)
January 1, 2019	20,000	445,016,234	$	—	$	4,450	$	7,615,138
Cumulative effect adjustment for adoption of ASU 2016-02, “Leases (Topic 842)”	—	—	—		—		—
Net income	—	—	—		—		—
Other comprehensive loss	—	—	—		—		—
Preferred stock dividends - $55.00 per share (Note G)	—	—	—		—		—
Common stock issued	—	—	—		—		(7,667)
Common stock dividends - $3.53 per share (Note G)	—	—	—		—		(180,421)
Other, net	—	—	—		—		(23,155)
December 31, 2019	20,000	445,016,234	—		4,450		7,403,895
Net income	—	—	—		—		—
Other comprehensive loss (Note H)	—	—	—		—		—
Preferred stock dividends - $55.00 per share (Note G)	—	—	—		—		(550)
Common stock issued	—	29,900,000	—		299		934,473
Common stock dividends - $3.74 per share (Note G)	—	—	—		—		(992,741)
Other, net	—	—	—		—		8,319
December 31, 2020	20,000	474,916,234	—		4,749		7,353,396
Net income	—	—	—		—		—
Other comprehensive income (Note H)	—	—	—		—		—
Preferred stock dividends - $55.00 per share (Note G)	—	—	—		—		—
Common stock issued	—	—	—		—		6,680
Common stock dividends - $3.74 per share (Note G)	—	—	—		—		(168,145)
Other, net	—	—	—		—		21,930
December 31, 2021	20,000	474,916,234	$	—	$	4,749	$	7,213,861

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ONEOK, Inc. and Subsidiaries
CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY
(Continued)
	Accumulated Other Comprehensive Loss		Retained Earnings		Treasury Stock		Total Equity
	(Thousands of dollars)
January 1, 2019	$	(188,239)	$	—	$	(851,806)	$	6,579,543
Cumulative effect adjustment for adoption of ASU 2016-02, “Leases (Topic 842)”	—		(67)		—		(67)
Net income	—		1,278,577		—		1,278,577
Other comprehensive loss	(185,761)		—		—		(185,761)
Preferred stock dividends - $55.00 per share (Note G)	—		(1,100)		—		(1,100)
Common stock issued	—		—		43,412		35,745
Common stock dividends - $3.53 per share (Note G)	—		(1,277,410)		—		(1,457,831)
Other, net	—		—		—		(23,155)
December 31, 2019	(374,000)		—		(808,394)		6,225,951
Net income	—		612,809		—		612,809
Other comprehensive loss (Note H)	(177,449)		—		—		(177,449)
Preferred stock dividends - $55.00 per share (Note G)	—		(550)		—		(1,100)
Common stock issued	—		—		44,096		978,868
Common stock dividends - $3.74 per share (Note G)	—		(612,259)		—		(1,605,000)
Other, net	—		—		—		8,319
December 31, 2020	(551,449)		—		(764,298)		6,042,398
Net income	—		1,499,706		—		1,499,706
Other comprehensive income (Note H)	80,098		—		—		80,098
Preferred stock dividends - $55.00 per share (Note G)	—		(1,100)		—		(1,100)
Common stock issued	—		—		32,202		38,882
Common stock dividends - $3.74 per share (Note G)	—		(1,498,606)		—		(1,666,751)
Other, net	—		—		—		21,930
December 31, 2021	$	(471,351)	$	—	$	(732,096)	$	6,015,163

See accompanying Notes to Consolidated Financial Statements.

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ONEOK, INC. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

A.    SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Organization and Nature of Operations - We are a corporation incorporated under the laws of the state of Oklahoma.

Our Natural Gas Gathering and Processing segment provides midstream services to producers in North Dakota, Montana, Wyoming, Kansas and Oklahoma. Raw natural gas is typically gathered at the wellhead, compressed and transported through pipelines to our processing facilities. Processed natural gas, usually referred to as residue natural gas, is then recompressed and delivered to natural gas pipelines, storage facilities and end users. The NGLs separated from the raw natural gas are sold and delivered through NGL pipelines to fractionation facilities for further processing.

Our Natural Gas Liquids segment owns and operates facilities that gather, fractionate, treat and distribute NGLs and store NGL products, primarily in Oklahoma, Kansas, Texas, New Mexico and the Rocky Mountain region, which includes the Williston, Powder River and DJ Basins. We provide midstream services to producers of NGLs and deliver those products to the two primary market centers, one in the Mid-Continent in Conway, Kansas, and the other in the Gulf Coast in Mont Belvieu, Texas. We own or have an ownership interest in FERC-regulated NGL gathering and distribution pipelines in Oklahoma, Kansas, Texas, New Mexico, Montana, North Dakota, Wyoming and Colorado, and terminal and storage facilities in Kansas, Missouri, Nebraska, Iowa and Illinois. We have a 50% ownership interest in Overland Pass Pipeline Company, which operates an interstate NGL pipeline originating in Wyoming and Colorado and terminating in Kansas. The majority of the pipeline-connected natural gas processing plants in the Williston Basin, Oklahoma, Kansas and the Texas Panhandle are connected to our NGL gathering systems. We lease rail cars and own and operate truck- and rail-loading and -unloading facilities connected to our NGL fractionation, storage and pipeline assets. We also own FERC-regulated NGL distribution pipelines in Kansas, Missouri, Nebraska, Iowa, Illinois and Indiana that connect our Mid-Continent assets with Midwest markets, including Chicago, Illinois. A portion of our ONEOK North System transports refined products, including unleaded gasoline and diesel, from Kansas to Iowa.

Our Natural Gas Pipelines segment, through its wholly owned assets, provides intrastate and interstate natural gas transportation and storage services to end users. We have 50% ownership interests in Northern Border Pipeline and Roadrunner, which provide transportation services to various end users. Our interstate pipelines are regulated by the FERC and are located in North Dakota, Minnesota, Wisconsin, Illinois, Indiana, Kentucky, Tennessee, Oklahoma, Texas and New Mexico. Our intrastate natural gas pipeline and storage assets are located in Oklahoma, Kansas and Texas. Our assets connect major natural gas producing basins and market hubs with end-use customers.

Consolidation - Our Consolidated Financial Statements include our accounts and the accounts of our subsidiaries over which we have control or are the primary beneficiary. All intercompany balances and transactions have been eliminated in consolidation.

Investments in unconsolidated affiliates are accounted for using the equity method if we have the ability to exercise significant influence over operating and financial policies of our investee. Under this method, an investment is carried at its acquisition cost and adjusted each period for contributions made, distributions received and our share of the investee’s comprehensive income. For the investments we account for under the equity method, the premium or excess cost over underlying fair value of net assets is referred to as equity-method goodwill. Impairment of equity investments is recorded when the impairments are other than temporary. These amounts are recorded as investments in unconsolidated affiliates on our accompanying Consolidated Balance Sheets. See Note M for disclosures of our unconsolidated affiliates.

Distributions paid to us from our unconsolidated affiliates are classified as operating activities on our Consolidated Statements of Cash Flows until the cumulative distributions exceed our proportionate share of income from the unconsolidated affiliate since the date of our initial investment. The amount of cumulative distributions paid to us that exceeds our cumulative proportionate share of income in each period represents a return of investment and is classified as an investing activity on our Consolidated Statements of Cash Flows.

Use of Estimates - The preparation of our Consolidated Financial Statements and related disclosures in accordance with GAAP requires us to make estimates and assumptions with respect to values or conditions that cannot be known with certainty that affect the reported amounts on our Consolidated Financial Statements. Items that may be estimated include, but are not limited to, the economic useful life of assets, fair value of assets, liabilities and equity-method investments, obligations under employee benefit plans, provisions for uncollectible accounts receivable, expenses for services received but for which no invoice has been received, provision for income taxes, including any deferred tax valuation allowances, the results of litigation and various other

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recorded or disclosed amounts. In addition, a portion of our revenues and cost of sales and fuel are recorded based on current month prices and estimated volumes. The estimates are reversed in the following month when we record actual volumes.

We evaluate our estimates on an ongoing basis using historical experience, consultation with experts and other methods we consider reasonable based on the particular circumstances. Nevertheless, actual results may differ significantly from the estimates. Any effects on our financial position or results of operations from revisions to these estimates are recorded in the period when the facts that give rise to the revision become known.

Fair Value Measurements - For our fair value measurements, we utilize market prices, third-party pricing services, present value methods and standard option valuation models to determine the price we would receive from the sale of an asset or the transfer of a liability in an orderly transaction at the measurement date. We measure the fair value of a group of financial assets and liabilities consistent with how a market participant would price the net risk exposure at the measurement date.

Many of the contracts in our derivative portfolio are executed in liquid markets where price transparency exists. Our financial commodity derivatives are generally settled through a NYMEX or ICE clearing broker account with daily margin requirements. We validate our valuation inputs with third-party information and settlement prices from other sources, where available.

We compute the fair value of our derivative portfolio by discounting the projected future cash flows from our derivative assets and liabilities to present value using interest-rate yields to calculate present-value discount factors derived from the implied forward SOFR, LIBOR or other yield curve, as appropriate. The fair value of our forward-starting interest-rate swaps is determined using financial models that incorporate the implied forward LIBOR yield curve for the same period as the future interest-rate swap settlements. We consider current market data in evaluating counterparties’, as well as our own, nonperformance risk, net of collateral, by using counterparty-specific bond yields. Although we use our best estimates to determine the fair value of the derivative contracts we have executed, the ultimate market prices realized could differ materially from our estimates.

Fair Value Hierarchy - At each balance sheet date, we utilize a fair value hierarchy to classify fair value amounts recognized or disclosed in our financial statements based on the observability of inputs used to estimate such fair value. The levels of the hierarchy are described below:

•Level 1 - fair value measurements are based on unadjusted quoted prices for identical securities in active markets. These balances are composed predominantly of exchange-traded derivative contracts for natural gas and crude oil.

•Level 2 - fair value measurements are based on significant observable pricing inputs, including quoted prices for similar assets and liabilities in active markets and inputs from third-party pricing services supported with corroborative evidence. These balances are composed of exchange cleared derivatives to hedge natural gas basis and NGL price risk at certain market locations and over-the-counter interest-rate derivatives.

•Level 3 - fair value measurements are based on inputs that may include one or more unobservable inputs, including internally developed commodity price curves that incorporate market data from broker quotes and third-party pricing services. These balances are composed predominantly of exchange-cleared and over-the-counter derivatives to hedge NGL price risk at certain market locations. These commodity derivatives are generally valued using forward quotes provided by third-party pricing services that are validated with other market data. We believe any measurement uncertainty at December 31, 2021, is immaterial as our Level 3 fair value measurements are based on unadjusted pricing information from broker quotes and third-party pricing services.

Determining the appropriate classification of our fair value measurements within the fair value hierarchy requires management’s judgment regarding the degree to which market data is observable or corroborated by observable market data. We categorize derivatives based on the lowest level input that is significant to the fair value measurement in its entirety.

See Note B for our fair value measurements disclosures.

Cash and Cash Equivalents - Cash equivalents consist of highly liquid investments, which are readily convertible into cash and have original maturities of three months or less.

Revenue Recognition - Revenues are recognized when control of the promised goods or services is transferred to our customers in an amount that reflects the consideration we expect to be entitled to receive in exchange for those goods or services. Our payment terms vary by customer and contract type, including requiring payment before products or services are delivered to certain customers. However, the term between customer prepayments, completion of our performance obligations, invoicing and receipt of payment due is not significant.

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Performance Obligations and Revenue Sources - Revenue sources are disaggregated in Note Q and are derived from commodity sales and services revenues, as described below:

Commodity Sales (all segments) - We contract to deliver residue natural gas, condensate, unfractionated NGLs and/or NGL products to customers at a specified delivery point. Our sales agreements may be daily or longer-term contracts for a specified volume. We consider the sale and delivery of each unit of a commodity an individual performance obligation as the customer is expected to control, accept and benefit from each unit individually. We record revenue when the commodity is delivered to the customer as this represents the point in time when control of the product is transferred to the customer. Revenue is recorded based on the contracted selling price, which is generally index-based and settled monthly.

Services

Gathering only contracts (Natural Gas Gathering and Processing segment) - Under this type of contract, we charge fees for providing midstream services, which include gathering and treating our customer’s natural gas. Our performance obligation begins with delivery of raw natural gas to our system. This service is treated as one performance obligation that is satisfied over time. We use the output method based on delivery of product to our system as the measure of progress, as our services are performed simultaneously.

Fee with POP contracts with producer take-in-kind rights (Natural Gas Gathering and Processing segment) - Under this type of contract, we do not control the stream of unprocessed natural gas that we receive at the wellhead due to the producer’s take-in-kind rights. We purchase a portion of the raw natural gas stream, charge fees for providing midstream services, which include gathering, treating, compressing and processing our customer’s natural gas. After performing these services, we return primarily the residue natural gas to the producer, sell the remaining commodities and remit a portion of the commodity sales proceeds to the producer less our contractual fees. Our performance obligation begins with delivery of raw natural gas to our system. This service is treated as one performance obligation that is satisfied over time. We use the output method based on delivery of product to our system as the measure of progress, as our services are performed simultaneously.

Transportation and exchange contracts (Natural Gas Liquids segment) - Under this type of contract, we charge fees for providing midstream services, which may include a bundled combination of gathering, transporting and/or fractionation of our customer’s NGLs. Our performance obligation begins with delivery of unfractionated NGLs or NGL products to our system. These services represent a series of distinct services that are treated as one performance obligation that is satisfied over time. We use the output method based on delivery of product to our system as the measure of progress, as our services are performed simultaneously. For transportation services under a tariff on our NGL transportation pipelines, fees are recorded upon redelivery to our customer at the completion of the transportation services.

Storage contracts (Natural Gas Liquids and Natural Gas Pipelines segments) - We reserve a stated storage capacity and inject/withdraw/store commodities for our customer. The capacity reservation and injection/withdrawal/storage services are considered a bundled service, as we integrate them into one stand-ready obligation provided on a daily basis over the life of the agreement and satisfied over time. Fixed capacity reservation fees are allocated and evenly recognized in revenue. Capacity reservation fees that vary based on a stated or implied economic index and correspond with the costs to provide our services are recognized in revenue as invoiced to our customers. For contracts that do not include a capacity reservation, transportation, injection and withdrawal fees are recognized in revenue as those services are provided and are dependent on the volume transported, injected or withdrawn by our customer, which is at our customer’s discretion. We use the output method based on the passage of time to measure satisfaction of the performance obligation associated with our daily stand-ready services.

Firm service transportation contracts (Natural Gas Pipelines segment) - We reserve a stated transportation capacity and transport commodities for our customer. The capacity reservation and transportation services are considered a bundled service, as we integrate them into one stand-ready obligation provided on a daily basis over the life of the agreement and satisfied over time. Fixed capacity reservation fees are allocated and evenly recognized in revenue. Capacity reservation fees that vary based on a stated or implied economic index and correspond with the costs to provide our services are recognized in revenue based on a daily effective fee rate. If the capacity reservation fees vary solely as a contract feature, contract assets or liabilities are recorded for the difference between the amount recorded in revenue and the amount billed to the customer. Transportation fees are recognized in revenue as those services are provided and are dependent on the volume transported by our customer, which is at our customer’s discretion. We use the output method based on the passage of time to measure satisfaction of the performance obligation associated with our daily stand-ready services.

Interruptible transportation contracts (Natural Gas Pipelines segment) - We agree to transport natural gas on our pipelines between the customer’s nominated receipt and delivery points if capacity is available after satisfying firm transportation service obligations. The transaction price is based on the transportation fees times the volumes transported. We use the output method

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based on delivery of product to the customer to measure satisfaction of the performance obligation. The total consideration for delivered volumes is recorded in revenue at the time of delivery, when the customer obtains control.

Many of the contract types described above contain additional fees or charges payable by customers for nonperformance (e.g., minimum volume commitments or product specifications), which are considered to be variable consideration. These fees and charges are not recorded until it is probable that a significant reversal of the associated revenue will not occur.

See Note P for our revenue disclosures.

Contract Assets and Contract Liabilities - Contract assets and contract liabilities are recorded when the amount of revenue recognized from a contract with a customer differs from the amount billed to the customer and recorded in accounts receivable. Our contract asset balances at the beginning and end of the period primarily relate to our firm service transportation contracts with tiered rates. Our contract liabilities primarily represent deferred revenue on NGL storage contracts for which revenue is recognized over a one-year term, and deferred revenue on contributions in aid of construction received from customers for which revenue is recognized over the contract periods, which range from 5 to 10 years.

Cost of Sales and Fuel - Cost of sales and fuel primarily includes (i) the cost of purchased commodities, including NGLs, natural gas and condensate, (ii) fees incurred for third-party transportation, fractionation and storage of commodities, (iii) fuel and power costs incurred to operate our own facilities that gather, process, transport and store commodities, and (iv) an offset from the contractual fees deducted from the cost of purchased commodities under the contract types below:

Fee with POP contracts with no producer take-in-kind rights (Natural Gas Gathering and Processing segment) - We purchase raw natural gas and charge contractual fees for providing midstream services, which include gathering, treating, compressing and processing the producer’s natural gas. After performing these services, we sell the commodities and return a portion of the commodity sales proceeds to the producer less our contractual fees.

Purchase with fee (Natural Gas Liquids segment) - Under this type of contract, we purchase raw, unfractionated NGLs at an index price and charge fees for providing midstream services, which may include a bundled combination of gathering, transporting and/or fractionation of our customer’s NGLs.

Operations and Maintenance - Operations and maintenance primarily includes (i) payroll and benefit costs, (ii) third-party costs for operations, maintenance and integrity management, regulatory compliance and environmental and safety, and (iii) other business-related service costs.

Accounts Receivable - Accounts receivable represent valid claims against nonaffiliated customers for products sold or services rendered. We present accounts receivable net of an allowance for credit losses to reflect the net amount expected to be collected. We assess the creditworthiness of our counterparties on an ongoing basis and require security, including prepayments and other forms of collateral, when appropriate. Outstanding customer receivables are reviewed regularly for possible nonpayment indicators, and allowances for credit losses are recorded based upon management’s estimate of collectability, current conditions and supportable forecasts at each balance sheet date. At December 31, 2021, our allowance for credit losses was not material.

Inventory - The values of current NGLs and natural gas in storage are determined using the lower of weighted-average cost or net realizable value. Noncurrent NGLs and natural gas are classified as property and valued at cost. Materials and supplies are valued at average cost. Certain large equipment inventory, which will ultimately be included in property, plant and equipment when utilized, is included in other assets in our Consolidated Balance Sheets and is valued at weighted-average cost.

Commodity Imbalances - Commodity imbalances represent amounts payable or receivable for NGL exchange contracts and natural gas pipeline imbalances and are valued at market prices. Under the majority of our NGL exchange agreements, we physically receive volumes of unfractionated NGLs, including the risk of loss and legal title to such volumes, from the exchange counterparty. In turn, we deliver NGL products back to the customer and charge them gathering, transportation and fractionation fees. To the extent that the volumes we receive under such agreements differ from those we deliver, we record a net exchange receivable or payable position with the counterparties. These net exchange receivables and payables are generally settled with movements of NGL products rather than with cash. Natural gas pipeline imbalances are settled in cash or in-kind, subject to the terms of the pipelines’ tariffs or by agreement.

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Derivatives and Risk Management - We utilize derivatives to reduce our market-risk exposure to commodity price and interest-rate fluctuations and to achieve more predictable cash flows. We record all derivative instruments at fair value, with the exception of normal purchases and normal sales transactions that are expected to result in physical delivery. Commodity price and interest-rate volatility may have a significant impact on the fair value of derivative instruments as of a given date. The accounting for changes in the fair value of a derivative instrument depends on whether it has been designated and qualifies as part of a hedging relationship and, if so, the reason for holding it. The table below summarizes the various ways in which we account for our derivative instruments and the impact on our Consolidated Financial Statements:

		Recognition and Measurement
Accounting Treatment		Balance Sheet		Income Statement
Normal purchases and normal sales	-	Fair value not recorded	-	Change in fair value not recognized in earnings
Mark-to-market	-	Recorded at fair value	-	Change in fair value recognized in earnings
Cash flow hedge	-	Recorded at fair value. The gain or loss on the derivative instrument is reported initially as a component of accumulated other comprehensive income (loss)	-	The gain or loss on the derivative instrument is reclassified out of accumulated other comprehensive income (loss) into earnings when the forecasted transaction affects earnings
Fair value hedge	-	Recorded at fair value	-	The gain or loss on the derivative instrument is recognized in earnings
	-	Change in fair value of the hedged item is recorded as an adjustment to book value	-	Change in fair value of the hedged item is recognized in earnings

To reduce our exposure to fluctuations in natural gas, NGLs and condensate prices, we periodically enter into futures, forward purchases and sales, options or swap transactions in order to hedge anticipated purchases and sales of natural gas, NGLs and condensate. Interest-rate swaps are used from time to time to manage interest-rate risk. Under certain conditions, we designate our derivative instruments as a hedge of exposure to changes in fair values or cash flows. We formally document all relationships between hedging instruments and hedged items, as well as risk-management objectives and strategies for undertaking various hedge transactions, and methods for assessing and testing correlation and hedge effectiveness. We specifically identify the forecasted transaction that has been designated as the hedged item in a cash flow hedge relationship. We assess hedging relationships at the inception of the hedge and on an ongoing basis to determine whether the hedging relationship is, and is expected to remain, highly effective. We also document our normal purchases and normal sales transactions that we expect to result in physical delivery and that we elect to exempt from derivative accounting treatment.

The realized revenues and purchase costs of our derivative instruments not considered held for trading purposes and derivatives that qualify as normal purchases or normal sales that are expected to result in physical delivery are reported on a gross basis.

Cash flows from futures, forwards, options and swaps that are accounted for as hedges are included in the same category as the cash flows from the related hedged items in our Consolidated Statements of Cash Flows.

See Notes B and C for disclosures of our fair value measurements and risk-management and hedging activities, respectively.

Property, Plant and Equipment - Our properties are stated at cost, including AFUDC and capitalized interest. In some cases, the cost of regulated property retired or sold, plus removal costs, less salvage, is charged to accumulated depreciation. Gains and losses from sales or transfers of nonregulated properties or an entire operating unit or system of our regulated properties are recognized in income. Maintenance and repairs are charged directly to expense.

The interest portion of AFUDC and capitalized interest represent the cost of borrowed funds used to finance construction activities for regulated and nonregulated projects, respectively. We capitalize interest costs during the construction or upgrade of qualifying assets. These costs are recorded as a reduction to interest expense. The equity portion of AFUDC represents the capitalization of the estimated average cost of equity used during the construction of major projects and is recorded in the cost of our regulated properties and as a credit to the allowance for equity funds used during construction.

Our properties are depreciated using the straight-line method over their estimated useful lives. Generally, we apply depreciation rates to functional groups of property having similar economic lives. We periodically conduct depreciation studies to assess the economic lives of our assets. For our regulated assets, these depreciation studies are completed as a part of our rate proceedings or tariff filings, and the changes in economic lives, if applicable, are implemented prospectively when the new rates are approved. For our nonregulated assets, if it is determined that the estimated economic life changes, the changes are made prospectively. Changes in the estimated economic lives of our property, plant and equipment could have a material effect on our financial position or results of operations.

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Property, plant and equipment on our Consolidated Balance Sheets includes construction work in process for capital projects that have not yet been placed in service and therefore are not being depreciated. Assets are transferred out of construction work in process when they are substantially complete and ready for their intended use.

See Note D for our property, plant and equipment disclosures.

Impairment of Goodwill and Long-Lived Assets, Including Intangible Assets - We assess our goodwill for impairment at least annually as of July 1, unless events or changes in circumstances indicate an impairment may have occurred before that time. Our qualitative goodwill impairment analysis performed as of July 1, 2021, did not result in an impairment charge nor did our analysis reflect any reporting units at risk, and subsequent to that date, no event has occurred indicating that the implied fair value of each of our reporting units is less than the carrying value of its net assets.

Goodwill - As part of our goodwill impairment test, we assess qualitative factors (including macroeconomic conditions, industry and market considerations, cost factors and overall financial performance) to determine whether it was more likely than not that the fair value of each of our reporting units was less than their carrying amount. If further testing is necessary or a quantitative test is elected, we perform a Step 1 analysis. In a Step 1 analysis, an assessment is made by comparing the fair value of a reporting unit with its carrying amount, including goodwill. If the carrying value of a reporting unit exceeds its fair value, an impairment loss is recognized in an amount equal to that excess, limited to the total amount of goodwill allocated to that reporting unit.

To estimate the fair value of our reporting units, we use two generally accepted valuation approaches, an income approach and a market approach, using assumptions consistent with a market participant’s perspective. Under the income approach, we use anticipated cash flows over a period of years plus a terminal value and discount these amounts to their present value using appropriate discount rates. Under the market approach, we apply EBITDA multiples to forecasted EBITDA. The multiples used are consistent with recent market transactions. The forecasted cash flows are based on probability weighted-average possible future cash flows for a reporting unit over a period of years.

Long-lived assets - We assess our long-lived assets for impairment whenever events or changes in circumstances indicate that an asset’s carrying amount may not be recoverable. An impairment is indicated if the carrying amount of a long-lived asset exceeds the sum of the undiscounted future cash flows expected to result from the use and eventual disposition of the asset. If an impairment is indicated, we record an impairment loss equal to the difference between the carrying value and the fair value of the long-lived asset.

Investments in unconsolidated affiliates - The impairment test for equity-method investments considers whether the fair value of the equity investment as a whole, not the underlying net assets, has declined and whether that decline is other than temporary. Therefore, we periodically evaluate the amount at which we carry our equity-method investments to determine whether current events or circumstances warrant adjustments to our carrying values.

See Notes D, E and M for our disclosures and related impairment charges related to long-lived assets, goodwill and intangible assets and investments in unconsolidated affiliates, respectively.

Regulation - Depending on the specific service provided, our natural gas transmission pipelines, NGL pipelines and certain natural gas storage facilities are subject to rate regulation and/or accounting requirements by one or more of the FERC, OCC, KCC and RRC. Accordingly, portions of our Natural Gas Liquids and Natural Gas Pipelines segments follow the accounting and reporting guidance for regulated operations. In our Consolidated Financial Statements and our Notes to Consolidated Financial Statements, regulated operations are defined pursuant to Financial Accounting Standards Board’s (FASB) Accounting Standards Codification 980, Regulated Operations. During the rate-making process for certain of our assets, regulatory authorities set the framework for what we can charge customers for our services and establish the manner that our costs are accounted for, including allowing us to defer recognition of certain costs and permitting recovery of the amounts through rates over time as opposed to expensing such costs as incurred. Certain examples of types of regulatory guidance include costs for fuel and losses, acquisition costs, contributions in aid of construction, charges for depreciation, and gains or losses on disposition of assets. This allows us to stabilize rates over time rather than passing such costs on to the customer for immediate recovery. Actions by regulatory authorities could have an effect on the amounts we may charge our customers. Any difference in the amount recoverable and the amount deferred is recorded as income or expense at the time of the regulatory action. A write-off of regulatory assets and costs not recovered may be required if all or a portion of the regulated operations have rates that are no longer (i) established by independent, third-party regulators and (ii) set at levels that will recover our costs when considering the demand and competition for our services.

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Retirement and Other Postretirement Employee Benefits - We have defined benefit retirement plans covering certain employees and former employees. We sponsor welfare plans that provide postretirement medical and life insurance benefits to certain employees hired prior to 2017 who retire with at least five years of service. The expense and liability related to these plans is calculated using statistical and other factors that attempt to anticipate future events. These factors include assumptions about the discount rate, expected return on plan assets, rate of future compensation increases, mortality and employment length. In determining the projected benefit obligations and costs, assumptions can change from period to period and may result in changes in the costs and liabilities we recognize.

See Note K for our retirement and other postretirement employee benefits disclosures.

Income Taxes - Deferred income taxes are provided for the difference between the financial statement and income tax basis of assets and liabilities and carryforward items based on income tax laws and rates existing at the time the temporary differences are expected to reverse. Generally, the effect of a change in tax rates on deferred tax assets and liabilities is recognized in income in the period that includes the enactment date of the rate change.

We utilize a more-likely-than-not recognition threshold and measurement attribute for the financial statement recognition and measurement of a tax position that is taken or expected to be taken in a tax return. We reflect penalties and interest as part of income tax expense as they become applicable for tax provisions that do not meet the more-likely-than-not recognition threshold and measurement attribute. For all periods presented, we had no uncertain tax positions that required the establishment of a material reserve.

We utilize the “with-and-without” approach for intra-period tax allocation for purposes of allocating total tax expense (or benefit) for the year among the various financial statement components.

We file numerous consolidated and separate income tax returns with federal tax authorities of the United States along with the tax authorities of several states. We are not under any United States federal audits or statute waivers at this time.

See Note L for our income taxes disclosures.

Asset Retirement Obligations - Asset retirement obligations represent legal obligations associated with the retirement of long-lived assets that result from the acquisition, construction, development and/or normal use of the asset. Certain of our natural gas gathering and processing, NGL and natural gas pipeline facilities are subject to agreements or regulations that give rise to our asset retirement obligations for removal or other disposition costs associated with retiring the assets in place upon the discontinued use of the assets. We recognize the fair value of a liability for an asset retirement obligation in the period when it is incurred if a reasonable estimate of the fair value can be made. We are not able to estimate reasonably the fair value of the asset retirement obligations for portions of our assets, primarily certain pipeline assets, because the settlement dates are indeterminable given our expected continued use of the assets with proper maintenance. We expect our pipeline assets, for which we are unable to estimate reasonably the fair value of the asset retirement obligation, will continue in operation as long as supply and demand for natural gas and NGLs exist. Based on the widespread use of natural gas for heating and cooking activities for residential users and electric-power generation for commercial users, as well as use of NGLs by the petrochemical industry, we expect supply and demand to exist for the foreseeable future.

For our assets that we are able to make an estimate, the fair value of the liability is added to the carrying amount of the associated asset, and this additional carrying amount is depreciated over the life of the asset. The liability is accreted at the end of each period through charges to operating expense. If the obligation is settled for an amount other than the carrying amount of the liability, we will recognize a gain or loss on settlement. The depreciation and accretion expense are immaterial to our Consolidated Financial Statements.

Contingencies - Our accounting for contingencies covers a variety of business activities, including contingencies for legal and environmental exposures. We accrue these contingencies when our assessments indicate that it is probable that a liability has been incurred or an asset will not be recovered and an amount can be estimated reasonably. We expense legal fees as incurred and base our legal liability estimates on currently available facts and our estimates of the ultimate outcome or resolution. Accruals for estimated losses from environmental remediation obligations generally are recognized no later than completion of a remediation feasibility study. Recoveries of environmental remediation costs from other parties are recorded as assets when their receipt is deemed probable. Our expenditures for environmental evaluation, mitigation, remediation and compliance to date have not been significant in relation to our financial position or results of operations, and our expenditures related to environmental matters had no significant effect on earnings or cash flows during 2021, 2020 and 2019. Actual results may differ from our estimates resulting in an impact, positive or negative, on earnings.

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See Note N for additional discussion of contingencies.

Share-Based Payments - We expense the fair value of share-based payments net of estimated forfeitures. We estimate forfeiture rates based on historical forfeitures under our share-based payment plans.

See Note J for our share-based payments disclosures.

Earnings per Common Share - Basic EPS is calculated by dividing net income available to common shareholders by the daily weighted-average number of shares of common stock outstanding during the period, vested restricted and performance units that have been deferred and share awards deferred under the compensation plan for non-employee directors. Diluted EPS is calculated by dividing net income available to common shareholders by the daily weighted-average number of shares of common stock outstanding during the period plus potentially dilutive components. The dilutive components are calculated based on the dilutive effect for each quarter. For fiscal-year periods, the dilutive components for each quarter are averaged to arrive at the fiscal year-to-date dilutive component.

See Note I for our EPS disclosures.

Segment Reporting - Our chief operating decision-maker reviews the financial performance of each of our three segments, as well as our financial performance as a whole, on a regular basis. Adjusted EBITDA by segment is utilized in this evaluation. We believe this financial measure is useful to investors because it and similar measures are used by many companies in our industry as a measurement of financial performance and are commonly employed by financial analysts and others to evaluate our financial performance and to compare financial performance among companies in our industry. Adjusted EBITDA for each segment is defined as net income adjusted for interest expense, depreciation and amortization, noncash impairment charges, income taxes, allowance for equity funds used during construction, noncash compensation expense, and other noncash items. This calculation may not be comparable with similarly titled measures of other companies.

See Note Q for our segments disclosures.

Recently Issued Accounting Standards Update - Changes to GAAP are established by the FASB in the form of ASUs to the FASB Accounting Standards Codification. We consider the applicability and impact of all ASUs. ASUs not listed below were assessed and determined to be either not applicable or clarifications of ASUs previously issued or listed below. Except as discussed below, there have been no new accounting pronouncements that have become effective or have been issued that are of significance or potential significance to us.

In January 2021, we adopted ASU 2019-12, “Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes,” which simplifies certain concepts in Topic 740, Income Taxes. The impact of adopting this standard was not material.

B.    FAIR VALUE MEASUREMENTS

Recurring Fair Value Measurements - The following tables set forth our recurring fair value measurements for the periods indicated:

	December 31, 2021
	Level 1		Level 2		Level 3		Total - Gross		Netting (a)		Total - Net
	(Thousands of dollars)
Derivative assets
Commodity contracts
Financial contracts	$	22,019	$	172,833	$	9,309	$	204,161	$	(204,161)	$	—
Total derivative assets	$	22,019	$	172,833	$	9,309	$	204,161	$	(204,161)	$	—
Derivative liabilities
Commodity contracts
Financial contracts	$	(67,226)	$	(112,922)	$	(123,592)	$	(303,740)	$	303,740	$	—
Interest-rate contracts	—		(145,524)		—		(145,524)		—		(145,524)
Total derivative liabilities	$	(67,226)	$	(258,446)	$	(123,592)	$	(449,264)	$	303,740	$	(145,524)

(a) - Derivative assets and liabilities are presented in our Consolidated Balance Sheet on a net basis. We net derivative assets and liabilities when a legally enforceable master-netting arrangement exists between the counterparty to a derivative contract and us. At December 31, 2021, we held no cash and posted $157.0 million of cash with various counterparties, including $99.6 million of cash collateral that is

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offsetting derivative net liability positions under master-netting arrangements in the table above. The remaining $57.4 million of cash collateral in excess of derivative net liability positions is included in other current assets in our Consolidated Balance Sheet.

	December 31, 2020
	Level 1		Level 2		Level 3		Total - Gross		Netting (a)		Total - Net
	(Thousands of dollars)
Derivative assets
Commodity contracts
Financial contracts	$	6,697	$	—	$	103,801	$	110,498	$	(110,498)	$	—
Total derivative assets	$	6,697	$	—	$	103,801	$	110,498	$	(110,498)	$	—
Derivative liabilities
Commodity contracts
Financial contracts	$	(10,489)	$	—	$	(135,122)	$	(145,611)	$	145,611	$	—
Interest-rate contracts	—		(203,407)		—		(203,407)		—		(203,407)
Total derivative liabilities	$	(10,489)	$	(203,407)	$	(135,122)	$	(349,018)	$	145,611	$	(203,407)

(a) - Derivative assets and liabilities are presented in our Consolidated Balance Sheet on a net basis. We net derivative assets and liabilities when a legally enforceable master-netting arrangement exists between the counterparty to a derivative contract and us. At December 31, 2020, we held no cash and posted $63.1 million of cash with various counterparties, including $35.1 million of cash collateral that is offsetting derivative net liability positions under master-netting arrangements in the table above. The remaining $28.0 million of cash collateral in excess of derivative net liability positions is included in other current assets in our Consolidated Balance Sheet.

The following table sets forth a reconciliation of our Level 3 fair value measurements for the periods indicated:

	Years Ended
	December 31,
Derivative Assets (Liabilities)	2021		2020
	(Thousands of dollars)
Net assets (liabilities) at beginning of period	$	(31,321)	$	30,772
Total changes in fair value:
Settlements included in net income (a)	31,003		(31,660)
Transfers out of Level 3 derivatives	(59,911)		—
New Level 3 derivatives included in other comprehensive income (loss) (b)	(57,325)		(36,568)
Unrealized change included in other comprehensive income (loss) (b)	3,271		6,135
Net liabilities at end of period	$	(114,283)	$	(31,321)

(a) - Included in commodity sales revenues/cost of sales and fuel in our Consolidated Statements of Income.

(b) - Included in change in fair value of derivatives in our Consolidated Statements of Comprehensive Income.

During the year ended December 31, 2021, transfers out of Level 3 related to commodity derivatives associated with certain locations for both NGL and natural gas basis swaps were principally due to improved transparency of market prices as a result of the volume and frequency of transactions in these markets. We consider the valuation of these commodity derivatives transacted through a clearing broker and valued with an unadjusted published price from an exchange as a Level 2 valuation. Our Level 3 fair value measurements continue to include NGL derivatives in other markets valued using forward quotes provided by third-party pricing services that are validated with other unobservable market data. During the year ended December 31, 2020, there were no transfers in or out of Level 3 of the fair value hierarchy.

Other Financial Instruments - The approximate fair value of cash and cash equivalents, accounts receivable, accounts payable and short-term borrowings is equal to book value due to the short-term nature of these items. Our cash and cash equivalents are composed of bank and money market accounts and are classified as Level 1. Our short-term borrowings are classified as Level 2 since the estimated fair value of the short-term borrowings can be determined using information available in the commercial paper market. We have investments at December 31, 2021, associated with our supplemental executive retirement plan and nonqualified deferred compensation plan that are carried at fair value and primarily composed of exchange-traded mutual funds classified as Level 1.

The estimated fair value of our consolidated long-term debt, including current maturities, was $15.6 billion and $16.3 billion at December 31, 2021 and 2020, respectively. The book value of our consolidated long-term debt, including current maturities, was $13.6 billion and $14.2 billion at December 31, 2021 and 2020, respectively. The estimated fair value of the aggregate

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senior notes outstanding was determined using quoted market prices for similar issues with similar terms and maturities. The estimated fair value of our consolidated long-term debt is classified as Level 2.

C.    RISK-MANAGEMENT AND HEDGING ACTIVITIES USING DERIVATIVES

Risk-management Activities - We are sensitive to changes in natural gas, crude oil and NGL prices, principally as a result of contractual terms under which these commodities are processed, purchased and sold. We are also subject to the risk of interest-rate fluctuation in the normal course of business. We use physical-forward purchases and sales and financial derivatives to secure a certain price for a portion of our natural gas, condensate and NGL products; to reduce our exposure to commodity price and interest-rate fluctuations; and to achieve more predictable cash flows. We follow established policies and procedures to assess risk and approve, monitor and report our risk-management activities. We have not used these instruments for trading purposes.

Commodity price risk - Commodity price risk refers to the risk of loss in cash flows and future earnings arising from adverse changes in the price of natural gas, NGLs and condensate. We may use the following commodity derivative instruments to reduce the near-term commodity price risk associated with a portion of the forecasted sales of these commodities:

•Futures contracts - Standardized contracts to purchase or sell natural gas and crude oil for future delivery or settlement under the provisions of exchange regulations;

•Forward contracts - Nonstandardized commitments between two parties to purchase or sell natural gas, crude oil or NGLs for future physical delivery. These contracts are typically nontransferable and can only be canceled with the consent of both parties;

•Swaps - Exchange of one or more payments based on the value of one or more commodities. These instruments transfer the financial risk associated with a future change in value between the counterparties of the transaction, without also conveying ownership interest in the asset or liability;

•Options - Contractual agreements that give the holder the right, but not the obligation, to buy or sell a fixed quantity of a commodity at a fixed price within a specified period of time. Options may either be standardized and exchange-traded or customized and nonexchange-traded; and

•Collar - Combination of a purchased put option and a sold call option, which places a floor and ceiling price for commodity sales being hedged.

We may also use other instruments to mitigate commodity price risk.

In our Natural Gas Gathering and Processing segment, we are exposed to commodity price risk as a result of retaining a portion of the commodity sales proceeds associated with our fee with POP contracts. Under certain fee with POP contracts, our fees and POP percentage may increase or decrease if production volumes, delivery pressures or commodity prices change relative to specified thresholds. In certain commodity price environments, our contractual fees on these fee with POP contracts may decrease, which would impact the average fee rate in our Natural Gas Gathering and Processing segment. We also are exposed to basis risk between the various production and market locations where we buy and sell commodities. As part of our hedging strategy, we use the previously described commodity derivative financial instruments and physical-forward contracts to reduce the impact of price fluctuations related to natural gas, NGLs and condensate.

In our Natural Gas Liquids segment, we are primarily exposed to commodity price risk resulting from the relative values of the various NGL products to each other, the value of NGLs in storage and the relative value of NGLs to natural gas. We are also exposed to location price differential risk as a result of the relative value of NGL purchases at one location and sales at another location, primarily related to our optimization and marketing business. As part of our hedging strategy, we utilize physical-forward contracts and commodity derivative financial instruments to reduce the impact of price fluctuations related to NGLs.

In our Natural Gas Pipelines segment, we are primarily exposed to commodity price risk on our intrastate pipelines because they consume natural gas in operations and retain natural gas from our customers for operations or as part of our fee for services provided. When the amount consumed in operations differs from the amount provided by our customers, our pipelines must buy or sell natural gas, or store or use natural gas inventory, which can expose this segment to commodity price risk depending on the regulatory treatment for this activity. To the extent that commodity price risk in our Natural Gas Pipelines segment is not mitigated by fuel cost-recovery mechanisms, we may use physical-forward sales or purchases to reduce the impact of natural gas price fluctuations. At December 31, 2021 and 2020, there were no financial derivative instruments with respect to our natural gas pipeline operations.

Interest-rate risk - We may manage interest-rate risk through the use of fixed-rate debt, floating-rate debt and interest-rate swaps. Interest-rate swaps are agreements to exchange interest payments at some future point based on specified notional

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amounts. In 2020, we settled $750 million of our forward-starting interest-rate swaps related to our underwritten public offerings of $1.75 billion senior unsecured notes resulting in a loss of $152.5 million, which is included in accumulated other comprehensive loss and amortized to interest expense over the term of the related debt. We also settled the remaining $1.3 billion of our interest-rate swaps used to hedge our LIBOR-based interest payments in 2020 resulting in a loss of $48.3 million.

At December 31, 2021, and December 31, 2020, we had forward-starting interest-rate swaps with notional amounts totaling $1.1 billion to hedge the variability of interest payments on a portion of our forecasted debt issuances. All of our interest-rate swaps are designated as cash flow hedges.

Fair Values of Derivative Instruments - See Note A for a discussion of the inputs associated with our fair value measurements. The following table sets forth the fair values of our derivative instruments presented on a gross basis for the periods indicated:

		December 31, 2021				December 31, 2020
	Location in our Consolidated Balance Sheets	Assets		(Liabilities)		Assets		(Liabilities)
		(Thousands of dollars)
Derivatives designated as hedging instruments
Commodity contracts (a)
Financial contracts (b)		$	204,161	$	(303,740)	$	107,461	$	(142,573)
Interest-rate contracts	Other current liabilities	—		(145,524)		—		—
	Other deferred credits	—		—		—		(203,407)
Total derivatives designated as hedging instruments		204,161		(449,264)		107,461		(345,980)
Derivatives not designated as hedging instruments
Commodity contracts (a)
Financial contracts (b)		—		—		3,037		(3,038)
Total derivatives not designated as hedging instruments		—		—		3,037		(3,038)
Total derivatives		$	204,161	$	(449,264)	$	110,498	$	(349,018)

(a) - Derivative assets and liabilities are presented in our Consolidated Balance Sheets on a net basis when a legally enforceable master-netting arrangement exists between the counterparty to a derivative contract and us.

(b) - At December 31, 2021, and December 31, 2020, our derivative net liability positions under master-netting arrangements for financial contracts were fully offset by cash collateral of $99.6 million and $35.1 million, respectively.

Notional Quantities for Derivative Instruments - The following table sets forth the notional quantities for derivative instruments held for the periods indicated:

		December 31, 2021		December 31, 2020
	Contract Type	Net Purchased/Payor (Sold/Receiver)
Derivatives designated as hedging instruments: (a)
Cash flow hedges
Fixed price
-Natural gas (Bcf)	Futures	(32.3)		(43.3)
-Crude oil and NGLs (MMBbl)	Futures	(10.0)		(4.6)
Basis
-Natural gas (Bcf)	Futures	(30.5)		(43.3)
Interest-rate contracts (Billions of dollars)	Swaps	$	1.1	$	1.1

(a) - Notional amounts for derivatives not designated as hedging instruments are excluded from the table above due to fully offsetting notional quantities of 0.8 MMBbl for NGLs fixed priced derivative instruments at December 31, 2020.

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Cash Flow Hedges - The following table sets forth the unrealized change in fair value of cash flow hedges in other comprehensive income (loss) for the periods indicated:

	Years Ended December 31,
	2021		2020		2019
	(Thousands of dollars)
Commodity contracts	$	(322,648)	$	(5,699)	$	38,819
Interest-rate contracts	57,884		(208,616)		(230,771)
Total unrealized change in fair value of cash flow hedges in other comprehensive income (loss)	$	(264,764)	$	(214,315)	$	(191,952)

The following table sets forth the effect of cash flow hedges on net income for the periods indicated:

Derivatives in Cash Flow Hedging Relationships	Location of Gain (Loss) Reclassified from Accumulated Other Comprehensive Loss into Net Income
		Years Ended December 31,
		2021		2020		2019
		(Thousands of dollars)
Commodity contracts	Commodity sales revenues	$	(731,793)	$	85,436	$	94,547
	Cost of sales and fuel	473,612		(19,170)		(44,202)
Interest-rate contracts (a)	Interest expense	(39,952)		(93,676)		(23,230)
Total change in fair value of cash flow hedges reclassified from accumulated other comprehensive loss into net income on derivatives		$	(298,133)	$	(27,410)	$	27,115

(a) - The year ended December 31, 2020, includes a loss of $48.3 million on the settlement of $1.3 billion of interest-rate swaps used to hedge our LIBOR-based interest payments.

Credit Risk - We monitor the creditworthiness of our counterparties and compliance with policies and limits established by our Risk Oversight and Strategy Committee. We maintain credit policies with regard to our counterparties that we believe minimize overall credit risk. These policies include an evaluation of potential counterparties’ financial condition (including credit ratings, bond yields and credit default swap rates), collateral requirements under certain circumstances and the use of standardized master-netting agreements that allow us to net the positive and negative exposures associated with a single counterparty. We use internally developed credit ratings for counterparties that do not have a credit rating.

Our financial commodity derivatives are generally settled through a NYMEX or ICE clearing broker account with daily margin requirements. However, we may enter into financial derivative instruments that contain provisions that require us to maintain an investment-grade credit rating from S&P, Fitch and/or Moody’s. If our credit ratings on our senior unsecured long-term debt were to decline below investment grade, the counterparties to the derivative instruments could request collateralization on derivative instruments in net liability positions. There were no financial derivative instruments with contingent features related to credit risk at December 31, 2021.

The counterparties to our derivative contracts typically consist of major energy companies, financial institutions and commercial and industrial end users. This concentration of counterparties may affect our overall exposure to credit risk, either positively or negatively, in that the counterparties may be affected similarly by changes in economic, regulatory or other conditions. Based on our policies, exposures, credit and other reserves, we do not anticipate a material adverse effect on our financial position or results of operations as a result of counterparty nonperformance.

At December 31, 2021, the credit exposure from our derivative assets is with investment-grade companies in the financial services sector.

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D.    PROPERTY, PLANT AND EQUIPMENT

The following table sets forth our property, plant and equipment by property type, for the periods indicated:

	Estimated Useful Lives (Years)	December 31, 2021		December 31, 2020
		(Thousands of dollars)
Nonregulated
Gathering pipelines and related equipment	5 to 40	$	4,371,936	$	4,143,752
Processing and fractionation and related equipment	3 to 40	5,356,508		5,084,802
Storage and related equipment	3 to 54	874,522		798,785
Transmission pipelines and related equipment	5 to 54	886,343		810,434
General plant and other	2 to 60	695,117		647,675
Construction work in process	—	1,132,961		1,265,736
Regulated
Storage and related equipment	5 to 25	9,197		9,180
Natural gas transmission pipelines and related equipment	5 to 77	1,660,034		1,569,268
NGL transmission pipelines and related equipment	5 to 88	8,595,968		8,423,544
General plant and other	2 to 50	73,449		72,535
Construction work in process	—	164,504		247,224
Property, plant and equipment		23,820,539		23,072,935
Accumulated depreciation and amortization - nonregulated		(2,885,020)		(2,514,328)
Accumulated depreciation and amortization - regulated		(1,615,645)		(1,403,679)
Net property, plant and equipment		$	19,319,874	$	19,154,928

The average depreciation rates for our regulated property are set forth, by segment, in the following table for the periods indicated:

	Years Ended December 31,
	2021	2020	2019
Natural Gas Liquids	2.2%	2.2%	2.0%
Natural Gas Pipelines	2.1%	2.1%	2.1%

We incurred costs for construction work in process that had not been paid at December 31, 2021, 2020 and 2019, of $130.5 million, $151.7 million and $544.8 million, respectively. Such amounts are not included in capital expenditures (less AFUDC) on the Consolidated Statements of Cash Flows.

Impairment Charges - In 2020, we evaluated our Natural Gas Gathering and Processing segment asset groups and determined that the carrying value of certain long-lived asset groups in the Powder River Basin, western Oklahoma and Kansas were not recoverable and exceeded their estimated fair value. As a result, we recorded noncash impairment charges of $362.3 million, which includes a natural gas processing plant and infrastructure in the Powder River Basin and its related supply contracts and natural gas processing plants and infrastructure in western Oklahoma and Kansas. In our Natural Gas Liquids segment, we recorded noncash impairment charges of $71.6 million related primarily to certain inactive assets, as our expectation for future use of the assets changed. These charges are included within impairment charges in our Consolidated Statement of Income for the year ended December 31, 2020.

E.    GOODWILL AND INTANGIBLE ASSETS

Goodwill - The following table sets forth our goodwill, by segment, for the periods indicated:

	December 31, 2021		December 31, 2020
	(Thousands of dollars)
Natural Gas Liquids	$	371,217	$	371,217
Natural Gas Pipelines	156,375		156,375
Total goodwill	$	527,592	$	527,592

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Impairment Charges - In 2020, we experienced a significant decline in our share price and market capitalization as the energy industry experienced historic events that led to a simultaneous demand and supply disruption. Due to the impact of these events, we tested our goodwill for impairment and concluded that the carrying value of the Natural Gas Gathering and Processing reporting unit exceeded its estimated fair value, resulting in a noncash impairment charge of $153.4 million, which is included within impairment charges in our Consolidated Statement of Income for the year ended December 31, 2020. At December 31, 2021 and 2020, we have no remaining goodwill in our Natural Gas Gathering and Processing segment.

Intangible Assets - Our intangible assets relate primarily to contracts acquired through acquisitions in our Natural Gas Liquids and Natural Gas Gathering and Processing segments, which are being amortized over periods of 15 to 40 years. Amortization expense for intangible assets was $10.4 million in 2021, $10.8 million in 2020, and $11.9 million in 2019, and the aggregate amortization expense for each of the next five years is estimated to be $10.4 million. The following table reflects the gross carrying amount and accumulated amortization of intangible assets for the periods presented:

	December 31, 2021		December 31, 2020
	(Thousands of dollars)
Gross intangible assets	$	381,435	$	381,435
Accumulated amortization	(145,732)		(135,304)
Net intangible assets	$	235,703	$	246,131

Impairment Charges - In 2020 in our Natural Gas Gathering and Processing segment, we recorded noncash impairment charges to intangible assets of $19.9 million related to supply contracts associated with our natural gas processing plant in the Powder River Basin, which was also impaired. These charges are included within impairment charges in our Consolidated Statement of Income for the year ended December 31, 2020.

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F.    DEBT

The following table sets forth our consolidated debt for the periods indicated:

	December 31, 2021		December 31, 2020
	(Thousands of dollars)
Commercial paper outstanding	$	—	$	—
Senior unsecured obligations:
$700,000 at 4.25% due February 2022	—		541,877
$900,000 at 3.375% due October 2022	895,814		895,814
$425,000 at 5.0% due September 2023	425,000		425,000
$500,000 at 7.5% due September 2023	500,000		500,000
$500,000 at 2.75% due September 2024	500,000		500,000
$500,000 at 4.9% due March 2025	500,000		500,000
$400,000 at 2.2% due September 2025	387,000		387,000
$600,000 at 5.85% due January 2026	600,000		600,000
$500,000 at 4.0% due July 2027	500,000		500,000
$800,000 at 4.55% due July 2028	800,000		800,000
$100,000 at 6.875% due September 2028	100,000		100,000
$700,000 at 4.35% due March 2029	700,000		700,000
$750,000 at 3.4% due September 2029	714,251		714,251
$850,000 at 3.1% due March 2030	780,093		780,093
$600,000 at 6.35% due January 2031	600,000		600,000
$400,000 at 6.0% due June 2035	400,000		400,000
$600,000 at 6.65% due October 2036	600,000		600,000
$600,000 at 6.85% due October 2037	600,000		600,000
$650,000 at 6.125% due February 2041	650,000		650,000
$400,000 at 6.2% due September 2043	400,000		400,000
$700,000 at 4.95% due July 2047	689,006		689,006
$1,000,000 at 5.2% due July 2048	1,000,000		1,000,000
$750,000 at 4.45% due September 2049	672,530		713,676
$500,000 at 4.5% due March 2050	443,015		451,270
$300,000 at 7.15% due January 2051	300,000		300,000
Guardian Pipeline
Weighted average 7.85% due December 2022	—		13,657
Total debt	13,756,709		14,361,644
Unamortized portion of terminated swaps	11,596		13,314
Unamortized debt issuance costs and discounts	(124,855)		(138,887)
Current maturities of long-term debt	(895,814)		(7,650)
Short-term borrowings (a)	—		—
Long-term debt	$	12,747,636	$	14,228,421

(a) - Individual issuances of commercial paper under our commercial paper program generally mature in 90 days or less.

$2.5 Billion Credit Agreement - Our $2.5 Billion Credit Agreement, which expires in June 2024, is a revolving credit facility and contains certain financial, operational and legal covenants. Among other things, these covenants include maintaining a ratio of indebtedness to adjusted EBITDA (EBITDA, as defined in our $2.5 Billion Credit Agreement, adjusted for all noncash charges and increased for projected EBITDA from certain lender-approved capital expansion projects) of no more than 5.0 to 1 at December 31, 2021.

Our $2.5 Billion Credit Agreement includes a $100 million sublimit for the issuance of standby letters of credit and a $200 million sublimit for swingline loans. Under the terms of our $2.5 Billion Credit Agreement, we may request an increase in the size of the facility to an aggregate of $3.5 billion by either commitments from new lenders or increased commitments from existing lenders. Our $2.5 Billion Credit Agreement contains provisions for an applicable margin rate and an annual facility fee, both of which adjust with changes in our credit ratings. Based on our current credit ratings, borrowings, if any, will accrue at LIBOR, or alternate benchmark rate, plus 110 basis points, and the annual facility fee is 15 basis points. At December 31,

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2021, our ratio of indebtedness to adjusted EBITDA was 4.0 to 1, and we were in compliance with all covenants under our $2.5 Billion Credit Agreement.

At December 31, 2021 and 2020, we had letters of credit issued totaling $7.7 million, and no borrowings outstanding under our $2.5 Billion Credit Agreement.

Senior Unsecured Obligations - All notes are senior unsecured obligations, ranking equally in right of payment with all of our existing and future unsecured senior indebtedness, and are structurally subordinate to any of the existing and future debt and other liabilities of any non-guarantor subsidiaries.

Issuances - In May 2020, we completed an underwritten public offering of $1.5 billion senior unsecured notes consisting of $600 million, 5.85% senior notes due 2026; $600 million, 6.35% senior notes due 2031; and $300 million, 7.15% senior notes due 2051. The net proceeds, after deducting underwriting discounts, commissions and offering expenses, were $1.48 billion. A portion of the proceeds was used to repay the outstanding borrowings under our $1.5 Billion Term Loan Agreement. The remainder was used for general corporate purposes.

In March 2020, we completed an underwritten public offering of $1.75 billion senior unsecured notes consisting of $400 million, 2.2% senior notes due 2025; $850 million, 3.1% senior notes due 2030; and $500 million, 4.5% senior notes due 2050. The net proceeds, after deducting underwriting discounts, commissions and offering expenses, were $1.73 billion. A portion of the proceeds was used to pay all outstanding amounts under our commercial paper program. The remainder was used for general corporate purposes, which included repayment of other existing indebtedness and funding capital expenditures.

In August 2019, we completed an underwritten public offering of $2.0 billion senior unsecured notes consisting of $500 million, 2.75% senior notes due 2024; $750 million, 3.4% senior notes due 2029; and $750 million, 4.45% senior notes due 2049. The net proceeds, after deducting underwriting discounts, commissions and offering expenses, were $1.97 billion. The proceeds were used for general corporate purposes, including repayment of existing indebtedness and funding capital expenditures.

In March 2019, we completed an underwritten public offering of $1.25 billion senior unsecured notes consisting of $700 million, 4.35% senior notes due 2029 and an additional issuance of $550 million of our existing 5.2% senior notes due 2048. The net proceeds, after deducting underwriting discounts, commissions and offering expenses, and exclusive of accrued interest, were $1.23 billion. The proceeds were used for general corporate purposes, including repayment of existing indebtedness and funding capital expenditures.

Repayments - In November 2021, we redeemed the remaining $536.1 million of our $700 million, 4.25% senior notes due February 2022 at 100% of the principal amount, plus accrued and unpaid interest, with cash on hand and short-term borrowings.

In June 2021, we repaid the remaining $11.7 million of Guardian Pipeline’s senior notes due December 2022 with cash on hand.

In 2021, we repurchased in the open market outstanding principal of certain of our senior notes in the amount of $55.2 million for an aggregate repurchase price of $54.6 million with cash on hand.

In May 2020, we repaid the remaining $1.25 billion of our $1.5 Billion Term Loan Agreement with cash on hand from our May 2020 public offering of $1.5 billion senior unsecured notes.

In 2020, we repurchased in the open market outstanding principal of certain of our senior notes in the amount of $224.4 million for an aggregate repurchase price of $199.6 million with cash on hand. In connection with these open market repurchases, we recognized $22.3 million of net gains on extinguishment of debt, which is included in other income in our Consolidated Statement of Income for the year ended December 31, 2020.

In September 2019, we redeemed our $300 million, 3.8% senior notes due March 2020 at a redemption price of $308.0 million, including the outstanding principal, plus accrued and unpaid interest, with cash on hand from our public offering of $2.0 billion senior unsecured notes in August 2019. In connection with this early redemption, we incurred a $2.7 million loss on extinguishment of debt, which is included in other expense in our Consolidated Statements of Income for the year ended December 31, 2019.

In August 2019, we repaid $250 million of our $1.5 Billion Term Loan agreement with cash on hand.

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In March 2019, we repaid our $500 million, 8.625% senior notes at maturity with a combination of cash on hand and short-term borrowings.

The aggregate maturities of long-term debt outstanding and interest obligations on debt as of December 31, 2021, for the years 2022 through 2026 are shown below:

	Senior Unsecured Obligations		Interest Obligations on Debt		Total
	(Millions of dollars)
2022	$	895.8	$	670.5	$	1,566.3
2023	$	925.0	$	629.3	$	1,554.3
2024	$	500.0	$	584.6	$	1,084.6
2025	$	887.0	$	553.6	$	1,440.6
2026	$	600.0	$	508.8	$	1,108.8

Covenants - Our senior notes are governed by indentures containing covenants, including among other provisions, limitations on our ability to place liens on our property or assets and to sell and leaseback our property. The indentures governing our 6.875% senior notes due 2028 include an event of default upon acceleration of other indebtedness of $15 million or more, and the indentures governing the remainder of our senior notes include an event of default upon the acceleration of other indebtedness of $100 million or more. Such events of default would entitle the trustee or the holders of 25% in aggregate principal amount of the outstanding senior notes to declare those senior notes immediately due and payable in full. The indenture for the 7.5% notes due 2023 also contains a provision that allows the holders of the notes to require ONEOK to offer to repurchase all or any part of their notes if a change of control and a credit rating downgrade occur at a purchase price of 101% of the principal amount, plus accrued and unpaid interest, if any.

We may redeem our senior notes, in whole or in part, at any time prior to their maturity at a redemption price equal to the principal amount, plus accrued and unpaid interest and a make-whole premium. We may redeem the balance of our senior notes due 2022, 2023, 2024, 2025, 2026, 2027, 2028 (4.55%), 2029, 2030, 2031, 2041, 2043, 2047, 2048, 2049, 2050 and 2051 at a redemption price equal to the principal amount, plus accrued and unpaid interest, starting one to six months before the maturity date as stipulated in the respective contract terms. Our senior notes are senior unsecured obligations, ranking equally in right of payment with all of our existing and future unsecured senior indebtedness.

Other - We amortize premiums, discounts and expenses incurred in connection with the issuance of long-term debt consistent with the terms of the respective debt instrument.

Debt Guarantees - ONEOK, ONEOK Partners and the Intermediate Partnership have cross guarantees in place for our and ONEOK Partners’ indebtedness.

G.    EQUITY

Series A and B Convertible Preferred Stock - There are no shares of Series A or Series B Preferred Stock currently issued or outstanding.

Equity Issuances - In July 2020, we established an “at-the-market” equity program for the offer and sale from time to time of our common stock up to an aggregate offering price of $1.0 billion. The program allows us to offer and sell common stock at prices we deem appropriate through a sales agent, in forward sales transactions through a forward seller or directly to one or more of the program’s managers acting as principals. Sales of our common stock may be made by means of ordinary brokers’ transactions on the NYSE, in block transactions or as otherwise agreed to between us and the sales agent. We are under no obligation to offer and sell common stock under the program. No shares have been sold through our “at-the-market” program as of the date of this report.

In June 2020, we completed an underwritten public offering of 29.9 million shares of our common stock at a public offering price of $32.00 per share, generating net proceeds, after deducting underwriting discounts, commissions and offering expenses, of $937.0 million. The proceeds were used for general corporate purposes, including repayment of existing indebtedness and funding capital expenditures.

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Dividends - Holders of our common stock share equally in any dividend declared by our Board of Directors, subject to the rights of the holders of outstanding Series E Preferred Stock. Dividends paid totaled $1.7 billion, $1.6 billion and $1.5 billion for 2021, 2020 and 2019, respectively. Although dividends per share did not increase in 2021 as compared with 2020, dividends paid increased due to the increase in number of shares outstanding as a result of our equity issuances. The following table sets forth the quarterly dividends per share paid on our common stock in the periods indicated:

	Years Ended December 31,
	2021		2020		2019
First Quarter	$	0.935	$	0.935	$	0.860
Second Quarter	0.935		0.935		0.865
Third Quarter	0.935		0.935		0.890
Fourth Quarter	0.935		0.935		0.915
Total	$	3.74	$	3.74	$	3.53

Additionally, in February 2022, we maintained and paid a quarterly common stock dividend of $0.935 per share ($3.74 per share on an annualized basis), which was paid to shareholders of record as of January 31, 2022.

The Series E Preferred Stock pays quarterly dividends on each share of Series E Preferred Stock, when, as and if declared by our Board of Directors, at a rate of 5.5% per year. We paid dividends for the Series E Preferred Stock of $1.1 million in 2021, 2020 and 2019. We paid quarterly dividends totaling $0.3 million for the Series E Preferred Stock in February 2022.

H.    ACCUMULATED OTHER COMPREHENSIVE LOSS

The following table sets forth the balance in accumulated other comprehensive loss for the periods indicated:

	Risk- Management Assets/Liabilities (a)		Retirement and Other Postretirement Benefit Plan Obligations (a) (b)		Risk- Management Assets/Liabilities of Unconsolidated Affiliates (a)		Accumulated Other Comprehensive Loss (a)
	(Thousands of dollars)
January 1, 2020	$	(233,520)	$	(131,481)	$	(8,999)	$	(374,000)
Other comprehensive loss before reclassifications	(165,023)		(40,341)		(8,635)		(213,999)
Amounts reclassified to net income (c)	21,097		14,187		1,266		36,550
Other comprehensive loss	(143,926)		(26,154)		(7,369)		(177,449)
December 31, 2020	(377,446)		(157,635)		(16,368)		(551,449)
Other comprehensive income (loss) before reclassifications	(203,868)		31,897		3,088		(168,883)
Amounts reclassified to net income (c)	228,999		18,079		1,903		248,981
Other comprehensive income	25,131		49,976		4,991		80,098
December 31, 2021	$	(352,315)	$	(107,659)	$	(11,377)	$	(471,351)

(a) - All amounts are presented net of tax.

(b) - Includes amounts related to supplemental executive retirement plan.

(c) - See Note C for details of amounts reclassified to net income for risk-management assets/liabilities and Note K for retirement and other postretirement benefit plan obligations.

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The following table sets forth information about the balance of accumulated other comprehensive loss at December 31, 2021, representing unrealized losses related to risk-management assets and liabilities:

	Risk- Management Assets/Liabilities (a)
	(Thousands of dollars)
Commodity derivative instruments expected to be realized within the next 36 months (b)	$	(76,942)
Settled interest-rate swaps to be recognized over the life of the long-term, fixed-rate debt (c)	(163,320)
Interest-rate swaps with future settlement dates expected to be amortized over the life of long-term debt	(112,053)
Accumulated other comprehensive loss at December 31, 2021	$	(352,315)

(a) - All amounts are presented net of tax.

(b) - Based on commodity prices on December 31, 2021, we expect net losses of $76.8 million, net of tax, will be reclassified into earnings during the next 12 months.

(c) - We expect net losses of $27.1 million, net of tax, will be reclassified into earnings during the next 12 months.

The remaining amounts in accumulated other comprehensive loss relate primarily to our retirement and other postretirement benefit plan obligations, which are expected to be amortized over the average remaining service period of employees participating in these plans.

I.    EARNINGS PER SHARE

The following tables set forth the computation of basic and diluted EPS for the periods indicated:

	Year Ended December 31, 2021
	Income		Shares	Per Share Amount
	(Thousands, except per share amounts)
Basic EPS
Net income available for common stock	$	1,498,606	446,403	$	3.36
Diluted EPS
Effect of dilutive securities	—		1,000
Net income available for common stock and common stock equivalents	$	1,498,606	447,403	$	3.35

	Year Ended December 31, 2020
	Income		Shares	Per Share Amount
	(Thousands, except per share amounts)
Basic EPS
Net income available for common stock	$	611,709	431,105	$	1.42
Diluted EPS
Effect of dilutive securities	—		677
Net income available for common stock and common stock equivalents	$	611,709	431,782	$	1.42

	Year Ended December 31, 2019
	Income		Shares	Per Share Amount
	(Thousands, except per share amounts)
Basic EPS
Net income available for common stock	$	1,277,477	413,560	$	3.09
Diluted EPS
Effect of dilutive securities	—		1,884
Net income available for common stock and common stock equivalents	$	1,277,477	415,444	$	3.07

J.    SHARE-BASED PAYMENTS

Our Equity Incentive Plan (EIP) provides for the granting of stock-based compensation, including restricted stock unit awards and performance unit awards, to eligible employees and the granting of stock awards to non-employee directors. We have

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reserved 8.5 million shares of common stock for issuance under the EIP and at December 31, 2021, we had 5.5 million shares available for issuance under the plan. This calculation of available shares reflects shares issued and estimated shares expected to be issued upon vesting of outstanding awards granted under the EIP, excluding estimated forfeitures expected to be returned to the plan.

Restricted Stock Units - We have granted restricted stock units to key employees that vest at the end of a three-year period and entitle the grantee to receive shares of our common stock. Restricted stock unit awards are measured at fair value as if they were vested and issued on the grant date and adjusted for estimated forfeitures. Restricted stock unit awards accrue dividend equivalents in the form of additional restricted stock units prior to vesting. Compensation expense is recognized on a straight-line basis over the vesting period of the award.

Performance Unit Awards - We have granted performance unit awards to key employees that vest at the end of a three-year period. Upon vesting, a holder of outstanding performance units is entitled to receive a number of shares of our common stock equal to a percentage (0% to 200%) of the performance units granted, based on our total shareholder return over the vesting period, compared with the total shareholder return of a peer group of other energy companies over the same period. Performance unit awards are measured at fair value on the grant date based on a Monte Carlo model and adjusted for estimated forfeitures. Performance unit awards accrue dividend equivalents in the form of additional performance units prior to vesting. Compensation expense is recognized on a straight-line basis over the vesting period of the award.

Stock Compensation for Non-Employee Directors

The EIP provides for the granting of nonstatutory stock options and stock bonus awards to non-employee directors, including performance unit awards and restricted stock unit awards. Under the EIP, awards may be granted by the Executive Compensation Committee at any time, until grants have been made for all shares authorized under the EIP. The maximum number of shares of common stock and cash-based awards that can be issued to a participant under the EIP during any year is limited to $0.8 million in value as of the grant date. No performance unit awards or restricted stock unit awards have been made to non-employee directors, and there are no options outstanding.

General

For all awards outstanding, we used a 3% forfeiture rate based on historical forfeitures under our share-based payment plans. We currently use treasury stock to satisfy our share-based payment obligations.

Compensation expense for our share-based payment plans was $54.1 million, $29.4 million and $46.5 million during 2021, 2020 and 2019, respectively, before related tax benefits of $14.4 million, $14.1 million and $31.7 million, respectively.

Restricted Stock Unit Activity

As of December 31, 2021, we had $19.3 million of total unrecognized compensation cost related to our nonvested restricted stock unit awards, which is expected to be recognized over a weighted-average period of 1.8 years. The following tables set forth activity and various statistics for our restricted stock unit awards:

	Number of Units	Weighted Average Price
Nonvested December 31, 2020	646,287	$	63.85
Granted	417,212	$	46.84
Released to participants	(242,765)	$	51.57
Forfeited	(40,797)	$	55.27
Nonvested December 31, 2021	779,937	$	59.02

	2021		2020		2019
Weighted-average grant date fair value (per share)	$	46.84	$	76.49	$	58.07
Fair value of units granted (thousands of dollars)	$	19,542	$	16,552	$	15,238
Grant date fair value of units vested (thousands of dollars)	$	12,519	$	11,204	$	10,691

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Performance Unit Activity

As of December 31, 2021, we had $31.7 million of total unrecognized compensation cost related to the nonvested performance unit awards, which is expected to be recognized over a weighted-average period of 1.8 years. The following tables set forth activity and various statistics related to the performance unit awards and the assumptions used in the valuations at the respective grant dates:

	Number of Units	Weighted Average Price
Nonvested December 31, 2020	834,246	$	75.96
Granted	542,183	$	62.03
Released to participants	(311,907)	$	64.00
Forfeited	(87,937)	$	68.37
Nonvested December 31, 2021	976,585	$	72.73

	2021	2020	2019
Volatility (a)	60.30%	21.70%	27.10%
Dividend yield	8.13%	4.87%	5.05%
Risk-free interest rate	0.21%	1.39%	2.47%

(a) - Volatility was based on historical volatility over three years using daily stock price observations.

	2021		2020		2019
Weighted-average grant date fair value (per share)	$	62.03	$	88.43	$	68.02
Fair value of units granted (thousands of dollars)	$	33,632	$	25,028	$	23,020
Grant date fair value of units vested (thousands of dollars)	$	19,962	$	17,722	$	15,018

Employee Stock Purchase Plan

We have reserved a total of 11.6 million shares of common stock for issuance under our Employee Stock Purchase Plan (the ESPP). Subject to certain exclusions, all employees are eligible to participate in the ESPP. Employees can choose to have up to 10% of their base pay withheld from each paycheck during the offering period to purchase our common stock, subject to terms and limitations of the plan. The purchase price of the stock is 85% of the lower of its grant date or exercise date market price. Approximately 69%, 68% and 62% of employees participated in the plan in 2021, 2020 and 2019, respectively. Under the plan, we sold 277,012 shares at a weighted average of $38.98 per share in 2021, 359,977 shares at a weighted average of $27.78 per share in 2020 and 171,590 shares at a weighted average of $51.24 per share in 2019.

Employee Stock Award Program

Under our Employee Stock Award Program, we issue, for no monetary consideration, to all eligible employees one share of our common stock when the per-share closing price of our common stock on the NYSE is at or above each one-dollar increment above its previous high closing price. The total number of shares of our common stock available for issuance under this program is 900,000. Shares issued to employees under this program during 2020 and 2019 totaled 2,871 and 14,022, respectively. Compensation expense related to the Employee Stock Award Program was $0.2 million and $1.0 million for 2020 and 2019, respectively. No shares were issued to employees under this program in 2021. As of the date of this report, the next award will be issued when our common stock closes at or above $78.

Deferred Compensation Plan for Non-Employee Directors

Our Deferred Compensation Plan for Non-Employee Directors provides our non-employee directors the option to defer all or a portion of their compensation for their service on our Board of Directors. Under the plan, directors may elect either a cash deferral option or a phantom stock option. Under the cash deferral option, directors may elect to defer the receipt of all or a portion of their annual retainer fees, which will be credited with interest during the deferral period. Under the phantom stock option, directors may defer all or a portion of their annual retainer fees and receive such fees on a deferred basis in the form of shares of common stock under our EIP, which earn the equivalent of dividends declared on our common stock. Shares are distributed to non-employee directors at the fair market value of our common stock at the date of distribution.

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K.    EMPLOYEE BENEFIT PLANS

Retirement and Other Postretirement Benefit Plans

Retirement Plans - We have a defined benefit pension plan covering certain employees and former employees, which closed to new participants in 2005. In addition, we have a supplemental executive retirement plan for the benefit of certain officers who participate in our defined benefit pension plan. Our supplemental executive retirement plan is closed to new participants. We fund our defined benefit pension plan at a level needed to maintain or exceed the minimum funding levels required by the Employee Retirement Income Security Act of 1974, as amended.

All employees are eligible to make salary deferrals and receive company matching contributions under our 401(k) Plan, and employees that do not participate in our defined benefit pension plan are also eligible to receive quarterly and annual profit-sharing contributions under our 401(k) Plan.

Other Postretirement Benefit Plans - We sponsor health and welfare plans that provide postretirement medical and life insurance benefits to employees hired prior to 2017 who retire with at least five years of full-time consecutive service. The postretirement medical plan for pre-Medicare participants is contributory, with retiree contributions adjusted periodically, and contains other cost-sharing features such as deductibles and coinsurance. The postretirement medical plan for Medicare-eligible participants is an account-based plan under which participants may elect to purchase private insurance policies under a private exchange and/or seek reimbursement of other eligible medical expenses.

Obligations and Funded Status - The following table sets forth our retirement and other postretirement benefit plans benefit obligations and fair value of plan assets for the periods indicated:

	Retirement Benefits				Other Postretirement Benefits
	December 31,				December 31,
	2021		2020		2021		2020
Change in benefit obligation	(Thousands of dollars)
Benefit obligation, beginning of period	$	583,072	$	534,849	$	54,515	$	52,309
Service cost	8,314		8,154		421		460
Interest cost	16,900		18,318		1,454		1,771
Plan participants’ contributions	—		—		1,092		1,032
Actuarial loss (gain)	(22,792)		37,951		(2,496)		2,860
Benefits paid	(18,483)		(16,200)		(3,959)		(3,917)
Benefit obligation, end of period (b)	567,011		583,072		51,027		54,515
Change in plan assets
Fair value of plan assets, beginning of period	379,092		346,792		20,874		39,060
Actual return on plan assets (a)	41,374		36,400		5,919		(15,699)
Employer contributions	11,200		12,100		—		—
Plan participants’ contributions	—		—		1,092		1,032
Benefits paid	(18,483)		(16,200)		(3,488)		(3,519)
Fair value of plan assets, end of period (c)	413,183		379,092		24,397		20,874
Balance at December 31	$	(153,828)	$	(203,980)	$	(26,630)	$	(33,641)
Current liabilities	$	(5,219)	$	(4,679)	$	—	$	—
Noncurrent liabilities	(148,609)		(199,301)		(26,630)		(33,641)
Balance at December 31	$	(153,828)	$	(203,980)	$	(26,630)	$	(33,641)

(a) - Other Postretirement Benefits for the year ended December 31, 2020, includes a $13.2 million tax loss incurred from the exit of an investment in an insurance contract.

(b) - The benefit obligation for Retirement Benefits at December 31, 2021 and 2020, include the supplemental executive retirement plan obligation.

(c) - Fair value of plan assets for Retirement Benefits exclude the assets of our supplemental executive retirement plan, which totaled $111.2 million and $116.2 million at December 31, 2021 and 2020, respectively, and are included in other assets on the Consolidated Balance Sheets. These assets are maintained in a rabbi trust and are not treated as assets of the supplemental executive retirement plan.

The accumulated benefit obligation for our retirement plans was $541.8 million and $548.2 million at December 31, 2021 and 2020, respectively.

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The actuarial gains and losses impacting our benefit obligations for our retirement and other postretirement benefit plans are due primarily to changes in the discount rate assumptions discussed in the “Actuarial Assumptions” section below.

Components of Net Periodic Benefit Cost - The following table sets forth the components of net periodic benefit cost for our retirement and other postretirement benefit plans for the periods indicated:

	Retirement Benefits						Other Postretirement Benefits
	Years Ended December 31,						Years Ended December 31,
	2021		2020		2019		2021		2020		2019
	(Thousands of dollars)
Components of net periodic benefit cost
Service cost	$	8,314	$	8,154	$	7,825	$	421	$	460	$	468
Interest cost	16,900		18,318		20,528		1,454		1,771		2,038
Expected return on plan assets	(25,109)		(24,964)		(23,600)		(1,364)		(2,894)		(2,285)
Amortization of prior service cost (credit)	114		114		—		—		—		(227)
Amortization of net loss	19,673		18,306		12,649		3,692		5		297
Net periodic benefit cost (income)	$	19,892	$	19,928	$	17,402	$	4,203	$	(658)	$	291

Other Comprehensive Income (Loss) - The following table sets forth the amounts recognized in other comprehensive income (loss) related to our retirement and other postretirement benefits for the periods indicated:

	Retirement Benefits						Other Postretirement Benefits
	Years Ended December 31,						Years Ended December 31,
	2021		2020		2019		2021		2020		2019
	(Thousands of dollars)
Net gain (loss) (a)	$	34,529	$	(31,016)	$	(25,389)	$	7,052	$	(21,453)	$	700
Prior service cost	—		—		(601)		—		—		—
Amortization of prior service cost (credit) (b)	114		114		—		—		—		(227)
Amortization of net loss (b)	19,673		18,306		12,649		3,692		5		297
Deferred income taxes	(12,493)		2,897		3,068		(2,471)		4,933		(177)
Total recognized in other comprehensive income (loss)	$	41,823	$	(9,699)	$	(10,273)	$	8,273	$	(16,515)	$	593

(a) - Other Postretirement Benefits for the year ended December 31, 2020, includes a $13.2 million tax loss incurred from the exit of an investment in an insurance contract.

(b) - These components are recognized in accumulated other comprehensive loss and are reclassified to other expense in our Consolidated Statements of Income, with related income tax benefits of $5.4 million, $4.2 million and $2.9 million reclassified to income tax expense for the years ended December 31, 2021, 2020 and 2019, respectively.

The table below sets forth the amounts in accumulated other comprehensive loss that had not yet been recognized as components of net periodic benefit expense for the periods indicated:

	Retirement Benefits				Other Postretirement Benefits
	December 31,				December 31,
	2021		2020		2021		2020
	(Thousands of dollars)
Prior service cost	$	(374)	$	(487)	$	—	$	—
Accumulated loss (a)	(131,460)		(185,662)		(14,815)		(25,558)
Accumulated other comprehensive loss	(131,834)		(186,149)		(14,815)		(25,558)
Deferred income taxes	36,759		49,251		3,852		6,322
Accumulated other comprehensive loss, net of tax	$	(95,075)	$	(136,898)	$	(10,963)	$	(19,236)

(a) - Other Postretirement Benefits for the year ended December 31, 2020, includes a $13.2 million tax loss incurred from the exit of an investment in an insurance contract.

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Actuarial Assumptions - The following table sets forth the weighted-average assumptions used to determine benefit obligations for retirement and other postretirement benefits for the periods indicated:

	Retirement Benefits		Other Postretirement Benefits
	December 31,		December 31,
	2021	2020	2021	2020
Discount rate	3.25%	3.00%	3.00%	2.75%
Compensation increase rate	3.60%	3.60%	NA	NA

The following table sets forth the weighted-average assumptions used to determine net periodic benefit costs for the periods indicated:

	Years Ended December 31,
	2021	2020	2019
Discount rate - retirement plans	3.00%	3.50%	4.50%
Discount rate - other postretirement plans	2.75%	3.50%	4.50%
Expected long-term return on plan assets	7.00%	7.50%	7.50%
Compensation increase rate	3.60%	3.70%	3.65%

We determine our overall expected long-term rate of return on plan assets based on our review of historical returns and economic growth models.

We determine our discount rates annually utilizing portfolios of high-quality bonds matched to the estimated benefit cash flows of our retirement and other postretirement benefit plans. Bonds selected to be included in the portfolios are only those rated by S&P or Moody’s as an AA or Aa2 rating or better and exclude callable bonds, bonds with less than a minimum issue size, yield outliers and other filtering criteria to remove unsuitable bonds.

Health Care Cost Trend Rates - The following table sets forth the assumed health care cost-trend rates for the periods indicated:

	2021	2020
Health care cost-trend rate assumed for next year	6.50%	6.50%
Rate to which the cost-trend rate is assumed to decline (the ultimate trend rate)	5.00%	5.00%
Year that the rate reaches the ultimate trend rate	2025	2024

Plan Assets - Our investment strategy is to invest plan assets in accordance with sound investment practices that emphasize long-term fundamentals. The goal of this strategy is to maximize investment returns while managing risk in order to meet the plan’s current and projected financial obligations. The investment allocation for our other postretirement benefit plans is to target a diversified mix of approximately 30% fixed income and 70% equity securities. The investment allocation for our defined benefit pension plan follows a glide path approach of liability-driven investing that shifts a higher portfolio weighting to fixed income as the plan’s funded status increases. The purpose of liability-driven investing is to structure the asset portfolio to more closely resemble the pension liability and thereby more effectively hedge against changes in the liability. The plan’s current investments include a diverse blend of various domestic and international equities, investments in various classes of debt securities, real estate and hedge funds. The target allocation for the assets of our retirement plan as of December 31, 2021, is as follows:

Domestic and international equities	42	%
Long duration fixed income	30	%
Return-seeking credit	11	%
Hedge funds	10	%
Real estate funds	7	%
Total	100	%

As part of our risk management for the plans, minimums and maximums have been set for each of the asset classes listed above.

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The following tables set forth the plan assets by fair value category as of the measurement date for our defined benefit pension and other postretirement benefit plans:

	Pension Benefits
	December 31, 2021
Asset Category	Level 1		Level 2		Level 3		Subtotal		Measured at NAV (d)		Total
	(Thousands of dollars)
Investments:
Equity securities	$	42	$	—	$	—	$	42	$	—	$	42
Common/collective trusts
Equity securities (a)	—		—		—		—		166,132		166,132
Real estate funds	—		—		—		—		30,491		30,491
Government obligations	—		—		—		—		49,444		49,444
Corporate obligations (b)	—		—		—		—		120,877		120,877
Short-term investments	—		—		—		—		4,243		4,243
Other investments (c)	—		—		—		—		41,954		41,954
Fair value of plan assets	$	42	$	—	$	—	$	42	$	413,141	$	413,183

(a) - This category represents securities of the respective market sector from diverse industries.

(b) - This category represents bonds from diverse industries.

(c) - This category represents alternative investments in limited partnerships, which can be redeemed with a 30-day notice with no further restrictions. There are no unfunded capital commitments. These limited partnerships invest through multi-strategy programs in broadly diversified portfolios of private investment funds, hedge funds and/or separate accounts to seek equity-like returns with low market correlation, reduced volatility and limited risk.

(d) - Plan asset investments measured at fair value using the net asset value per share.

	Pension Benefits
	December 31, 2020
Asset Category	Level 1		Level 2		Level 3		Subtotal		Measured at NAV (d)		Total
	(Thousands of dollars)
Investments:
Equity securities	$	43	$	—	$	—	$	43	$	—	$	43
Common/collective trusts
Equity securities (a)	—		—		—		—		164,099		164,099
Real estate funds	—		—		—		—		24,134		24,134
Government obligations	—		—		—		—		45,237		45,237
Corporate obligations (b)	—		—		—		—		101,626		101,626
Short-term investments (e)	—		—		—		—		4,890		4,890
Other investments (c)	—		—		—		—		39,063		39,063
Fair value of plan assets	$	43	$	—	$	—	$	43	$	379,049	$	379,092

(a) - This category represents securities of the respective market sector from diverse industries.

(b) - This category represents bonds from diverse industries.

(c) - This category represents alternative investments in limited partnerships, which can be redeemed with a 30-day notice with no further restrictions. There are no unfunded capital commitments. These limited partnerships invest through multi-strategy programs in broadly diversified portfolios of private investment funds, hedge funds and/or separate accounts to seek equity-like returns with low market correlation, reduced volatility and limited risk.

(d) - Plan asset investments measured at fair value using the net asset value per share.

(e) - The fair value of short term investments in the Bank of New York Mellon EB Temporary Investment Fund was previously reported in Level 2. We elected to consistently apply the practical expedient to all investments within common/collective trusts, and therefore, the fair value of this fund is now measured at net asset value per share and no longer classified in the fair value hierarchy.

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	Other Postretirement Benefits
	December 31, 2021
Asset Category	Level 1		Level 2		Level 3		Total
	(Thousands of dollars)
Investments:
Equity securities (a)	$	17,953	$	—	$	—	$	17,953
Money market funds	—		480		—		480
Municipal obligations	5,964		—		—		5,964
Fair value of plan assets	$	23,917	$	480	$	—	$	24,397

(a) - This category represents securities of the respective market sector from diverse industries.

	Other Postretirement Benefits
	December 31, 2020
Asset Category	Level 1		Level 2		Level 3		Total
	(Thousands of dollars)
Investments:
Equity securities (a)(b)	$	15,116	$	—	$	—	$	15,116
Money market funds	—		808		—		808
Municipal obligations (b)	4,950		—		—		4,950
Fair value of plan assets	$	20,066	$	808	$	—	$	20,874

(a) - This category represents securities of the respective market sector from diverse industries.

(b) - Net proceeds of $16.2 million from the exit of an investment in an insurance contract were reinvested in various equity securities and municipal obligations.

Contributions - During 2021, we made $11.2 million in contributions to our defined benefit pension plan and no contributions to our other postretirement plans. Our defined benefit pension plan elected to adopt funding relief provided by the American Rescue Plan Act of 2021 legislation. As a result of the election, our defined benefit pension plan has no minimum required contribution in 2022.

Pension and Other Postretirement Benefit Payments - Benefit payments for our defined benefit pension and other postretirement benefit plans for the period ending December 31, 2021, were $18.5 million and $4.0 million, respectively. The following table sets forth the defined benefit pension and other postretirement benefits payments expected to be paid in 2022 through 2031:

	Pension Benefits		Other Postretirement Benefits
Benefits to be paid in:	(Thousands of dollars)
2022	$	25,962	$	3,387
2023	$	26,756	$	3,363
2024	$	27,769	$	3,302
2025	$	28,759	$	3,293
2026	$	29,651	$	3,220
2027 through 2031	$	156,041	$	15,339

The expected benefits to be paid are based on the same assumptions used to measure our benefit obligation at December 31, 2021, and include estimated future employee service.

Other Employee Benefit Plans

401(k) Plan - We have a 401(k) Plan covering all employees, and employee contributions are discretionary. We match 100% of employee 401(k) Plan contributions up to 6% of each participant’s eligible compensation each payroll period, subject to certain limits. We also make profit-sharing contributions under our 401(k) Plan for employees who do not participate in our defined benefit pension plan. We generally make a quarterly profit sharing contribution equal to 1% of each profit-sharing participant’s eligible compensation during the quarter and an annual discretionary profit-sharing contribution equal to a percentage of each profit-sharing participant’s eligible compensation. Our contributions made to the plan, including profit-sharing contributions, were $32.7 million, $27.1 million and $30.4 million in 2021, 2020 and 2019, respectively.

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Nonqualified Deferred Compensation Plan - The 2020 Nonqualified Deferred Compensation Plan and its predecessor nonqualified deferred compensation plans (collectively, the NQDC Plan) provide a select group of management and highly compensated employees, as approved by our Chief Executive Officer, with the option to defer portions of their compensation and receive notional employer contributions that generally are not available due to limitations on employer and employee contributions to qualified defined contribution plans under federal tax laws. We have investments included in other assets on the Consolidated Balance Sheets related to the NQDC Plan, which totaled $36.1 million and $32.4 million at December 31, 2021 and 2020, respectively. These investments are maintained in a rabbi trust. Our contributions to the plan were not material in 2021, 2020 and 2019.

L.    INCOME TAXES

The following table sets forth our provision for income taxes for the periods indicated:

	Years Ended December 31,
	2021		2020		2019
	(Thousands of dollars)
Current tax expense (benefit)
Federal	$	2,897	$	980	$	(1,278)
State	9,544		1,797		963
Total current tax expense (benefit)	12,441		2,777		(315)
Deferred tax expense
Federal	433,469		154,068		327,806
State	38,588		32,662		44,923
Total deferred tax expense	472,057		186,730		372,729
Total provision for income taxes	$	484,498	$	189,507	$	372,414

The following table is a reconciliation of our income tax provision for the periods indicated:

	Years Ended December 31,
	2021			2020			2019
	(Thousands of dollars)
Income before income taxes	$	1,984,204		$	802,316		$	1,650,991
Federal statutory income tax rate	21.0		%	21.0		%	21.0		%
Provision for federal income taxes	416,683			168,486			346,708
State income taxes, net of federal benefit	40,092			13,580			34,545
Deferred tax rate change, inclusive of valuation allowance	6,350			20,879			11,340
Excess tax benefits from share-based compensation	(1,968)			(7,380)			(20,983)
Other, net (a)	23,341			(6,058)			804
Income tax provision	$	484,498		$	189,507		$	372,414

(a) The year ended December 31, 2021, includes $19.4 million impact from previously recognized gains on certain benefit plan investments.

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The following table sets forth the tax effects of temporary differences that gave rise to significant portions of the deferred tax assets and liabilities for the periods indicated:

	December 31, 2021		December 31, 2020
Deferred tax assets	(Thousands of dollars)
Employee benefits and other accrued liabilities	$	95,952	$	96,741
Federal net operating loss	1,337,050		1,473,093
State net operating loss and benefits	216,181		258,929
Derivative instruments	118,063		134,499
Other	4,863		12,894
Total deferred tax assets	1,772,109		1,976,156
Valuation allowance for state net operating loss and tax credits
Carryforward expected to expire prior to utilization	(84,755)		(121,212)
Net deferred tax assets	1,687,354		1,854,944
Deferred tax liabilities
Excess of tax over book depreciation	84,692		87,021
Investment in partnerships (a)	2,769,352		2,437,620
Total deferred tax liabilities	2,854,044		2,524,641
Net deferred tax assets (liabilities)	$	(1,166,690)	$	(669,697)

(a) Due primarily to excess of tax over book depreciation.

As of December 31, 2021, we have federal net operating loss carryforwards of $6.4 billion, the majority of which have an indefinite carry forward period. We expect to generate taxable income and utilize these net operating loss carryforwards in future periods. We also have loss and credit carryovers in multiple states, $2.8 billion of which have an indefinite carry forward period and $1.9 billion of which will expire between 2022 and 2038. We have deferred tax assets related to federal and state net operating loss and credit carryforwards of $1.6 billion and $1.7 billion in 2021 and 2020, respectively. We believe that it is more likely than not that the tax benefits of certain state carryforwards will not be utilized; therefore, we recorded a valuation allowance of $6.4 million, $20.9 million and $11.3 million through net income related to these tax benefits in 2021, 2020 and 2019, respectively.

M.    UNCONSOLIDATED AFFILIATES

Investments in Unconsolidated Affiliates - The following table sets forth our investments in unconsolidated affiliates for the periods indicated:

	Net Ownership Interest	December 31, 2021		December 31, 2020
		(Thousands of dollars)
Northern Border Pipeline	50%	$	283,170	$	291,987
Overland Pass Pipeline	50%	403,011		409,573
Roadrunner	50%	70,777		66,794
Other (a)	Various	40,655		36,678
Investments in unconsolidated affiliates (b)		$	797,613	$	805,032

(a) - Year ended December 31, 2020, includes the impact of noncash impairment charges of $37.7 million related to the equity investments discussed below, offset partially by an acquisition of an additional equity interest for $20.0 million.

(b) - Equity-method goodwill (Note A) was $16.5 million at December 31, 2021 and 2020.

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Equity in Net Earnings from Investments and Impairments - The following table sets forth our equity in net earnings (loss) from investments for the periods indicated:

	Years Ended December 31,
	2021		2020		2019
	(Thousands of dollars)
Northern Border Pipeline	$	64,470	$	75,409	$	68,871
Overland Pass Pipeline	19,434		38,618		63,698
Roadrunner	33,293		29,017		26,839
Other	5,323		197		(4,867)
Equity in net earnings from investments	$	122,520	$	143,241	$	154,541
Impairment of equity investments	$	—	$	(37,730)	$	—

Impairment Charges - In 2020, we incurred a noncash impairment charge of $30.5 million related to our 10.2% investment in Venice Energy Services Company in our Natural Gas Gathering and Processing segment, which includes $22.3 million related to equity-method goodwill, and a $7.2 million noncash impairment charge related to our 50% investment in Chisholm Pipeline Company in our Natural Gas Liquids segment. These impairment charges are included within impairment of equity investments in our Consolidated Statement of Income for the year ended December 31, 2020.

We incurred expenses in transactions with unconsolidated affiliates of $62.8 million, $135.4 million and $164.7 million for 2021, 2020 and 2019, respectively, primarily related to Overland Pass Pipeline and Northern Border Pipeline. Revenue earned and accounts receivable from, and accounts payable to, our equity-method investees were not material.

Northern Border Pipeline - The Northern Border Pipeline partnership agreement provides that distributions to Northern Border Pipeline’s partners are to be made on a pro rata basis according to each partner’s ownership percentage interest. The Northern Border Pipeline Management Committee determines the amount and timing of such distributions. Any changes to, or suspension of, the cash distribution policy of Northern Border Pipeline requires the unanimous approval of the Northern Border Pipeline Management Committee. Cash distributions are equal to 100% of distributable cash flow as determined from Northern Border Pipeline’s financial statements based upon EBITDA less interest expense and maintenance capital expenditures. As determined by the Northern Border Pipeline Management Committee, we received an additional distribution of $50.0 million from Northern Border Pipeline during the year ended December 31, 2019. Loans or other advances from Northern Border Pipeline to its partners or affiliates are prohibited under its credit agreement. In all periods presented, we made no contributions to Northern Border Pipeline.

Overland Pass Pipeline - The Overland Pass Pipeline agreement provides that distributions to Overland Pass Pipeline’s members are to be made on a pro rata basis according to each member’s ownership percentage interest. The Overland Pass Pipeline Company Management Committee determines the amount and timing of such distributions. Any changes to, or suspension of, the cash distributions from Overland Pass Pipeline requires the unanimous approval of the Overland Pass Pipeline Company Management Committee. Cash distributions are equal to 100% of available cash as defined in the limited liability company agreement. In all periods presented, our contributions to Overland Pass Pipeline were not material.

Roadrunner - The Roadrunner agreement provides that distributions to members are made on a pro rata basis according to each member’s ownership interest. As the operator, we have been delegated the authority to determine such distributions in accordance with, and on the frequency set forth in, the Roadrunner agreement. Cash distributions are equal to 100% of available cash, as defined in the limited liability company agreement. In all periods presented, our contributions to Roadrunner were not material.

We have an operating agreement with Roadrunner that provides for reimbursement or payment to us for management services and certain operating costs. Reimbursements and payments from Roadrunner included in operating income in our Consolidated Statements of Income for all periods presented were not material.

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N.    COMMITMENTS AND CONTINGENCIES

Commitments - Firm transportation and storage contracts are fixed-price contracts that provide us with firm transportation and storage capacity. The following table sets forth our firm transportation and storage contract payments for the periods indicated:

	Firm Transportation and Storage Contracts
	(Millions of dollars)
2022	$	72.3
2023	63.1
2024	59.3
2025	53.9
2026	40.8
Thereafter	211.6
Total	$	501.0

Environmental Matters and Pipeline Safety - The operation of pipelines, plants and other facilities for the gathering, processing, fractionation, transportation and storage of natural gas, NGLs, condensate and other products is subject to numerous and complex laws and regulations pertaining to health, safety and the environment. As an owner and/or operator of these facilities, we must comply with laws and regulations that relate to air and water quality, hazardous and solid waste management and disposal, cultural resource protection and other environmental and safety matters. The cost of planning, designing, constructing and operating pipelines, plants and other facilities must incorporate compliance with these laws, regulations and safety standards. Failure to comply with these laws and regulations may trigger a variety of administrative, civil and potentially criminal enforcement measures, including citizen suits, which can include the assessment of monetary penalties, the imposition of remedial requirements and the issuance of injunctions or restrictions on operation or construction. Management does not believe that, based on currently known information, a material risk of noncompliance with these laws and regulations exists that will affect adversely our consolidated results of operations, financial condition or cash flows.

Legal Proceedings - We are a party to various legal proceedings that have arisen in the normal course of our operations. While the results of these proceedings cannot be predicted with certainty, we believe the reasonably possible losses from such proceedings, individually and in the aggregate, are not material. Additionally, we believe the probable final outcome of such proceedings will not have a material adverse effect on our consolidated results of operations, financial position or cash flows.

O.    LEASES

We lease certain buildings, warehouses, office space, pipeline capacity, land and equipment, including pipeline equipment, rail cars and information technology equipment. Our lease payments are generally straight-line and the exercise of lease renewal options, which vary in term, is at our sole discretion. We include renewal periods in a lease term if we are reasonably certain to exercise available renewal options. We apply the short-term policy election, which allows us to exclude from recognition leases with an initial term of 12 months or less. Our lease agreements do not include any residual value guarantees or material restrictive covenants.

Through ONEOK Leasing Company, L.L.C. and ONEOK Parking Company, L.L.C., we own an office building and a parking garage and lease excess space in these facilities to affiliates and others. Our consolidated lease income is not material.

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The following table sets forth information about our lease assets and liabilities included in our Consolidated Balance Sheet for the periods indicated:

Leases	Location in our Consolidated Balance Sheet	December 31, 2021		December 31, 2020
		(Thousands of dollars)
Assets
Operating leases	Other assets	$	89,558	$	100,154
Finance lease	Property, plant and equipment	29,962		28,286
Finance lease	Accumulated depreciation	(3,590)		(2,451)
Total leased assets		$	115,930	$	125,989
Liabilities
Current
Operating leases	Operating lease liability	$	13,783	$	13,610
Finance lease	Other current liabilities	2,584		2,153
Noncurrent
Operating leases	Operating lease liability	75,636		87,610
Finance lease	Other deferred credits	21,082		22,143
Total lease liabilities		$	113,085	$	125,516

The following table sets forth supplemental cash flow information related to our leases:

	Years Ended December 31,
	2021		2020
	(Thousands of dollars)
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows for operating leases	$	15,690	$	13,245
Financing cash flows for finance lease	$	2,307	$	1,949
Right-of-use assets obtained in exchange for operating lease liabilities (noncash) (a)	$	1,150	$	99,547

(a) - In December 2019, we entered into an operating lease for pipeline capacity with a lease term of 10 years that commenced January 1, 2020. In connection with this lease, we recognized an operating lease right-of-use asset and a lease liability with remaining balances of $69.0 million and $69.9 million, respectively, as of December 31, 2020.

The following table sets forth information about our lease costs for the periods indicated:

		Years Ended December 31,
	Location in our Consolidated Statement of Income	2021		2020
		(Thousands of dollars)
Operating leases	Operations and maintenance	$	17,747	$	17,162
Finance lease
Amortization of lease assets	Depreciation and amortization	1,139		1,131
Interest on lease liabilities	Interest expense	2,338		2,537
Total lease cost		$	21,224	$	20,830

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The following table sets forth information about our leases for the periods indicated:

	December 31, 2021	December 31, 2020
Weighted average remaining lease term (years)
Operating leases	7.8	8.3
Finance lease	6.6	7.8
Weighted average discount rate (a)
Operating leases	3.40%	3.20%
Finance lease	9.60%	10.00%

(a) - Our weighted-average discount rates represent the rate implicit in the lease or our incremental borrowing rate for a term equal to the remaining term of the lease.

The following table sets forth the maturity of our lease liabilities as of December 31, 2021:

	Finance Lease		Operating Leases
	(Millions of dollars)
2022	$	4.7	$	16.4
2023	4.7		13.9
2024	4.7		12.6
2025	5.4		11.2
2026	4.5		11.4
2027 and beyond	8.3		36.9
Total lease payments	32.3		102.4
Less: Interest	8.6		13.0
Present value of lease liabilities	$	23.7	$	89.4

P.    REVENUES

Contract Assets and Contract Liabilities - Our contract asset balances at the beginning and end of the years ended December 31, 2021 and 2020, primarily relate to our firm service transportation contracts with tiered rates, which are not material. The following table sets forth the balances in contract liabilities for the periods indicated:

Contract Liabilities	(Millions of dollars)
Balance at January 1, 2020	$	57.1
Revenue recognized included in beginning balance (c)	(36.1)
Net additions	20.4
Balance at December 31, 2020 (a)	41.4
Revenue recognized included in beginning balance	(23.7)
Net additions	33.8
Balance at December 31, 2021 (b)	$	51.5

(a) - Contract liabilities of $23.7 million and $17.7 million are included in other current liabilities and other deferred credits, respectively, in our Consolidated Balance Sheet.

(b) - Contract liabilities of $35.3 million and $16.2 million are included in other current liabilities and other deferred credits, respectively, in our Consolidated Balance Sheet.

(c) - Includes a contract settlement of revenue previously deferred.

Receivables from Customers and Revenue Disaggregation - Substantially all of the balances in accounts receivable on our Consolidated Balance Sheets at December 31, 2021 and 2020, relate to customer receivables. Revenues sources are disaggregated in Note Q.

Transaction Price Allocated to Unsatisfied Performance Obligations - We do not disclose the value of unsatisfied performance obligations for (i) contracts with an original expected length of one year or less and (ii) variable consideration on contracts for which we recognize revenue at the amount to which we have the right to invoice for services performed.

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The following table presents aggregate value allocated to unsatisfied performance obligations as of December 31, 2021, and the amounts we expect to recognize in revenue in future periods, related primarily to firm transportation and storage contracts with remaining contract terms ranging from one month to 22 years:

Expected Period of Recognition in Revenue	(Millions of dollars)
2022	$	339.1
2023	288.2
2024	238.1
2025	162.7
2026 and beyond	781.3
Total estimated transaction price allocated to unsatisfied performance obligations	$	1,809.4

The table above excludes variable consideration allocated entirely to wholly unsatisfied performance obligations, wholly unsatisfied promises to transfer distinct goods or services that are part of a single performance obligation and consideration we determine to be fully constrained. Information on the nature of the variable consideration excluded and the nature of the performance obligations to which the variable consideration relates can be found in the description of the major contract types discussed in Note A. The amounts we determined to be fully constrained relate to future sales obligations under long-term sales contracts where the transaction price is not known and minimum volume agreements, which we consider to be fully constrained until invoiced.

Q.    SEGMENTS

Segment Descriptions - Our operations are divided into three reportable business segments, as follows:

•our Natural Gas Gathering and Processing segment gathers, treats and processes natural gas;

•our Natural Gas Liquids segment gathers, treats, fractionates and transports NGLs and stores, markets and distributes NGL products; and

•our Natural Gas Pipelines segment transports and stores natural gas via regulated intrastate and interstate natural gas transmission pipelines and natural gas storage facilities.

Other and eliminations consist of corporate costs, the operating and leasing activities of our headquarters building and related parking facility and eliminations necessary to reconcile our reportable segments to our Consolidated Financial Statements.

For the year ended December 31, 2021, revenues from one customer in our Natural Gas Liquids segment represents approximately 11.6% of our consolidated revenues. For the years ended December 31, 2020 and 2019, we had no single customer from which we received 10% or more of our consolidated revenues.

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Operating Segment Information - The following tables set forth certain selected financial information for our operating segments for the periods indicated:

Year Ended December 31, 2021	Natural Gas Gathering and Processing		Natural Gas Liquids (a)		Natural Gas Pipelines (b)		Total Segments
	(Thousands of dollars)
NGL and condensate sales	$	2,821,175	$	13,653,120	$	—	$	16,474,295
Residue natural gas sales	1,483,898		—		115,495		1,599,393
Gathering, processing and exchange services revenue	135,501		517,758		—		653,259
Transportation and storage revenue	—		179,619		490,498		670,117
Other	20,965		41,376		910		63,251
Total revenues (c)	4,461,539		14,391,873		606,903		19,460,315
Cost of sales and fuel (exclusive of depreciation and operating costs)	(3,226,078)		(11,939,661)		(11,236)		(15,176,975)
Operating costs	(367,390)		(528,084)		(170,257)		(1,065,731)
Equity in net earnings from investments	3,757		21,000		97,763		122,520
Noncash compensation expense and other	17,299		18,511		4,637		40,447
Segment adjusted EBITDA	$	889,127	$	1,963,639	$	527,810	$	3,380,576
Depreciation and amortization	$	(260,011)	$	(298,937)	$	(58,702)	$	(617,650)
Investments in unconsolidated affiliates	$	27,018	$	416,648	$	353,947	$	797,613
Total assets	$	6,768,955	$	14,502,372	$	2,143,307	$	23,414,634
Capital expenditures	$	275,165	$	306,949	$	92,617	$	674,731

(a) - Our Natural Gas Liquids segment has regulated and nonregulated operations. Our Natural Gas Liquids segment’s regulated operations had revenues of $2.4 billion, of which $2.2 billion related to revenues within the segment, and cost of sales and fuel of $607.5 million.

(b) - Our Natural Gas Pipelines segment has regulated and nonregulated operations. Our Natural Gas Pipelines segment’s regulated operations had revenues of $394.2 million and cost of sales and fuel of $24.3 million.

(c) - Intersegment revenues are primarily commodity sales which are based on the contracted selling price, which is generally index-based and settled monthly, and for the Natural Gas Gathering and Processing segment totaled $2.9 billion. Intersegment revenues for the Natural Gas Liquids and Natural Gas Pipelines segments were not material.

Year Ended December 31, 2021	Total Segments		Other and Eliminations		Total
	(Thousands of dollars)
Reconciliations of total segments to consolidated
NGL and condensate sales	$	16,474,295	$	(2,904,598)	$	13,569,697
Residue natural gas sales	1,599,393		—		1,599,393
Gathering, processing and exchange services revenue	653,259		—		653,259
Transportation and storage revenue	670,117		(13,121)		656,996
Other	63,251		(2,287)		60,964
Total revenues (a)	$	19,460,315	$	(2,920,006)	$	16,540,309
Cost of sales and fuel (exclusive of depreciation and operating costs)	$	(15,176,975)	$	2,920,320	$	(12,256,655)
Operating costs	$	(1,065,731)	$	(1,357)	$	(1,067,088)
Depreciation and amortization	$	(617,650)	$	(4,051)	$	(621,701)
Equity in net earnings from investments	$	122,520	$	—	$	122,520
Investments in unconsolidated affiliates	$	797,613	$	—	$	797,613
Total assets	$	23,414,634	$	206,979	$	23,621,613
Capital expenditures	$	674,731	$	22,123	$	696,854

(a) - Noncustomer revenue for the year ended December 31, 2021, totaled $(565.0) million related primarily to losses from derivatives on commodity contracts.

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Year Ended December 31, 2020	Natural Gas Gathering and Processing		Natural Gas Liquids (a)		Natural Gas Pipelines (b)		Total Segments
	(Thousands of dollars)
NGL and condensate sales	$	889,388	$	6,409,332	$	—	$	7,298,720
Residue natural gas sales	771,486		—		8,693		780,179
Gathering, processing and exchange services revenue	141,943		488,574		—		630,517
Transportation and storage revenue	—		182,915		470,097		653,012
Other	17,304		9,192		1,192		27,688
Total revenues (c)	1,820,121		7,090,013		479,982		9,390,116
Cost of sales and fuel (exclusive of depreciation and operating costs)	(843,976)		(5,108,558)		(6,809)		(5,959,343)
Operating costs	(326,938)		(412,900)		(141,713)		(881,551)
Equity in net earnings (loss) from investments	(1,123)		39,938		104,426		143,241
Noncash compensation expense and other	1,952		8,748		1,540		12,240
Segment adjusted EBITDA	$	650,036	$	1,617,241	$	437,426	$	2,704,703
Depreciation and amortization	$	(247,010)	$	(271,900)	$	(55,739)	$	(574,649)
Impairment charges	$	(566,145)	$	(78,785)	$	—	$	(644,930)
Investments in unconsolidated affiliates	$	22,757	$	423,494	$	358,781	$	805,032
Total assets	$	6,499,908	$	13,636,109	$	2,100,213	$	22,236,230
Capital expenditures	$	446,142	$	1,655,759	$	71,918	$	2,173,819

(a) - Our Natural Gas Liquids segment has regulated and nonregulated operations. Our Natural Gas Liquids segment’s regulated operations had revenues of $2.0 billion, of which $1.8 billion related to revenues within the segment, and cost of sales and fuel of $520.6 million.

(b) - Our Natural Gas Pipelines segment has regulated and nonregulated operations. Our Natural Gas Pipelines segment’s regulated operations had revenues of $298.5 million and cost of sales and fuel of $30.4 million.

(c) - Intersegment revenues are primarily commodity sales which are based on the contracted selling price, which is generally index-based and settled monthly, and for the Natural Gas Gathering and Processing segment totaled $865.6 million. Intersegment revenues for the Natural Gas Liquids and Natural Gas Pipelines segments were not material.

Year Ended December 31, 2020	Total Segments		Other and Eliminations		Total
	(Thousands of dollars)
Reconciliations of total segments to consolidated
NGL and condensate sales	$	7,298,720	$	(820,851)	$	6,477,869
Residue natural gas sales	780,179		(10,860)		769,319
Gathering, processing and exchange services revenue	630,517		—		630,517
Transportation and storage revenue	653,012		(14,599)		638,413
Other	27,688		(1,564)		26,124
Total revenues (a)	$	9,390,116	$	(847,874)	$	8,542,242
Cost of sales and fuel (exclusive of depreciation and operating costs)	$	(5,959,343)	$	849,197	$	(5,110,146)
Operating costs	$	(881,551)	$	(4,653)	$	(886,204)
Depreciation and amortization	$	(574,649)	$	(4,013)	$	(578,662)
Impairment charges	$	(644,930)	$	—	$	(644,930)
Equity in net earnings from investments	$	143,241	$	—	$	143,241
Investments in unconsolidated affiliates	$	805,032	$	—	$	805,032
Total assets	$	22,236,230	$	842,524	$	23,078,754
Capital expenditures	$	2,173,819	$	21,562	$	2,195,381

(a) - Noncustomer revenue for the year ended December 31, 2020, totaled $65.8 million related primarily to gains from derivatives on commodity contracts.

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Year Ended December 31, 2019	Natural Gas Gathering and Processing		Natural Gas Liquids (a)		Natural Gas Pipelines (b)		Total Segments
	(Thousands of dollars)
NGL and condensate sales	$	1,224,378	$	7,910,833	$	—	$	9,135,211
Residue natural gas sales	966,149		—		1,244		967,393
Gathering, processing and exchange services revenue	164,299		414,238		—		578,537
Transportation and storage revenue	—		197,483		466,266		663,749
Other	13,813		9,962		4,477		28,252
Total revenues (c)	2,368,639		8,532,516		471,987		11,373,142
Cost of sales and fuel (exclusive of depreciation and operating costs)	(1,302,310)		(6,690,918)		(4,628)		(7,997,856)
Operating costs	(368,352)		(456,892)		(157,230)		(982,474)
Equity in net earnings (loss) from investments	(6,292)		65,123		95,710		154,541
Noncash compensation expense and other	10,965		15,936		2,977		29,878
Segment adjusted EBITDA	$	702,650	$	1,465,765	$	408,816	$	2,577,231
Depreciation and amortization	$	(219,519)	$	(196,132)	$	(57,250)	$	(472,901)
Investments in unconsolidated affiliates	$	34,426	$	439,393	$	388,025	$	861,844
Total assets	$	6,795,744	$	12,551,476	$	2,094,072	$	21,441,292
Capital expenditures	$	926,489	$	2,796,604	$	99,221	$	3,822,314

(a) - Our Natural Gas Liquids segment has regulated and nonregulated operations. Our Natural Gas Liquids segment’s regulated operations had revenues of $1.4 billion, of which $1.2 billion related to revenues within the segment, and cost of sales and fuel of $496.8 million.

(b) - Our Natural Gas Pipelines segment has regulated and nonregulated operations. Our Natural Gas Pipelines segment’s regulated operations had revenues of $285.3 million and cost of sales and fuel of $20.0 million.

(c) - Intersegment revenues are primarily commodity sales which are based on the contracted selling price, which is generally index-based and settled monthly, and for the Natural Gas Gathering and Processing segment totaled $1.2 billion. Intersegment revenues for the Natural Gas Liquids and Natural Gas Pipelines segments were not material.

Year Ended December 31, 2019	Total Segments		Other and Eliminations		Total
	(Thousands of dollars)
Reconciliations of total segments to consolidated
NGL and condensate sales	$	9,135,211	$	(1,190,424)	$	7,944,787
Residue natural gas sales	967,393		(1,418)		965,975
Gathering, processing and exchange services revenue	578,537		—		578,537
Transportation and storage revenue	663,749		(15,646)		648,103
Other	28,252		(1,287)		26,965
Total revenues (a)	$	11,373,142	$	(1,208,775)	$	10,164,367
Cost of sales and fuel (exclusive of depreciation and operating costs)	$	(7,997,856)	$	1,209,816	$	(6,788,040)
Operating costs	$	(982,474)	$	(390)	$	(982,864)
Depreciation and amortization	$	(472,901)	$	(3,634)	$	(476,535)
Equity in net earnings from investments	$	154,541	$	—	$	154,541
Investments in unconsolidated affiliates	$	861,844	$	—	$	861,844
Total assets	$	21,441,292	$	370,829	$	21,812,121
Capital expenditures	$	3,822,314	$	26,035	$	3,848,349

(a) - Noncustomer revenue for the year ended December 31, 2019, totaled $139.6 million related primarily to gains from derivatives on commodity contracts.

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	Years Ended December 31,
	2021		2020		2019
Reconciliation of net income to total segment adjusted EBITDA	(Thousands of dollars)
Net income	$	1,499,706	$	612,809	$	1,278,577
Add:
Interest expense, net of capitalized interest	732,924		712,886		491,773
Depreciation and amortization	621,701		578,662		476,535
Income tax expense	484,498		189,507		372,414
Impairment charges	—		644,930		—
Noncash compensation expense	42,592		8,540		26,699
Other corporate costs and equity AFUDC (a)	(845)		(42,631)		(68,767)
Total segment adjusted EBITDA	$	3,380,576	$	2,704,703	$	2,577,231

(a) - The year ended December 31, 2020, includes corporate net gains of $22.3 million on extinguishment of debt related to open market repurchases. The year ended December 31, 2019, includes higher equity AFUDC related to our capital-growth projects compared with 2020.

ITEM 9.    CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND

FINANCIAL DISCLOSURE

None.

ITEM 9A.    CONTROLS AND PROCEDURES

Evaluation of Disclosure Controls and Procedures

Our Chief Executive Officer (Principal Executive Officer) and Chief Financial Officer (Principal Financial Officer) have concluded that our disclosure controls and procedures were effective as of the end of the period covered by this report based on the evaluation of the controls and procedures required by Rules 13a-15(b) and 15d-15(b) of the Exchange Act.

Management’s Report on Internal Control Over Financial Reporting

Our management is responsible for establishing and maintaining adequate internal control over financial reporting, as such term is defined in Exchange Act Rule 13a-15(f). Under the supervision and with the participation of our management, including our Principal Executive Officer and Principal Financial Officer, we evaluated the effectiveness of our internal control over financial reporting based on the framework in Internal Control-Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission. Because of inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate. Based on our evaluation under that framework, our management concluded that our internal control over financial reporting was effective as of December 31, 2021.

The effectiveness of our internal control over financial reporting as of December 31, 2021, has been audited by PricewaterhouseCoopers LLP, an independent registered public accounting firm, as stated in their report which is included herein (Item 8).

Changes in Internal Control Over Financial Reporting

There have been no changes in our internal control over financial reporting during the quarter ended December 31, 2021, that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

ITEM 9B.    OTHER INFORMATION

Not applicable.

ITEM 9C.    DISCLOSURE REGARDING FOREIGN JURISDICTIONS THAT PREVENT INSPECTIONS

Not applicable.

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PART III

ITEM 10.    DIRECTORS, EXECUTIVE OFFICERS AND CORPORATE GOVERNANCE

Directors of the Registrant

Information concerning our directors is set forth in our 2022 definitive Proxy Statement and is incorporated herein by this reference.

Executive Officers of the Registrant

Information concerning our executive officers is included in Part I, Item 1, Business, of this Annual Report.

Compliance with Section 16(a) of the Exchange Act

Information on compliance with Section 16(a) of the Exchange Act is set forth in our 2022 definitive Proxy Statement and is incorporated herein by this reference.

Code of Ethics

Information concerning the code of ethics, or code of business conduct, is set forth in our 2022 definitive Proxy Statement and is incorporated herein by this reference.

Nominating Committee Procedures

Information concerning the Nominating Committee procedures is set forth in our 2022 definitive Proxy Statement and is incorporated herein by this reference.

Audit Committee

Information concerning the Audit Committee is set forth in our 2022 definitive Proxy Statement and is incorporated herein by this reference.

Audit Committee Financial Experts

Information concerning the Audit Committee Financial Experts is set forth in our 2022 definitive Proxy Statement and is incorporated herein by this reference.

ITEM 11.    EXECUTIVE COMPENSATION

Information on executive compensation is set forth in our 2022 definitive Proxy Statement and is incorporated herein by this reference.

ITEM 12.    SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT AND RELATED STOCKHOLDER MATTERS

Security Ownership of Certain Beneficial Owners

Information concerning the ownership of certain beneficial owners is set forth in our 2022 definitive Proxy Statement and is incorporated herein by this reference.

Security Ownership of Management

Information on security ownership of directors and officers is set forth in our 2022 definitive Proxy Statement and is incorporated herein by this reference.

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Equity Compensation Plan Information

The following table sets forth certain information concerning our equity compensation plans as of December 31, 2021:

	Number of Securities to be Issued Upon Exercise of Outstanding Options, Warrants and Rights	Weighted-Average Exercise Price of Outstanding Options, Warrants and Rights		Number of Securities Remaining Available For Future Issuance Under Equity Compensation Plans (Excluding Securities in Column (a))
Plan Category	(a)	(b) (3)		(c)
Equity compensation plans approved by security holders (1)	3,237,097		—	6,077,029
Equity compensation plans not approved by security holders (2)	330,901	$	58.76	—
Total	3,567,998	$	58.76	6,077,029

(1) - Includes shares granted under our Employee Stock Purchase Plan, Employee Stock Award Program and restricted stock incentive unit awards and performance unit awards granted under our former Long-Term Incentive Plan, our former Equity Compensation Plan and our Equity Incentive Plan. For a brief description of the material features of these plans, see Note J of the Notes to Consolidated Financial Statements in this Annual Report. Column (c) includes 573,622, 130,204 and 5,373,203 shares available for future issuance under our Employee Stock Purchase Plan, Employee Stock Award Program and Equity Incentive Plan, respectively.

(2) - Includes our NQDC Plan, Deferred Compensation Plan for Non-Employee Directors and our former Stock Compensation Plan for Non-Employee Directors. For a brief description of the material features of these plans, see Notes K and J of the Notes to Consolidated Financial Statements in this Annual Report.

(3) - There is no exercise price associated with restrictive stock incentive unit awards and performance unit awards. Compensation deferred into our common stock under our Deferred Compensation Plan for Non-Employee Directors is distributed to participants at fair market value on the date of distribution. The price used for these plans to calculate the weighted-average exercise price in the table is $58.76, which represents the 2021 year-end closing price of our common stock on the NYSE.

ITEM 13.    CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS, AND DIRECTOR INDEPENDENCE

Information on certain relationships and related transactions and director independence is set forth in our 2022 definitive Proxy Statement and is incorporated herein by this reference.

ITEM 14.    PRINCIPAL ACCOUNTING FEES AND SERVICES

Information concerning the principal accountant’s fees and services is set forth in our 2022 definitive Proxy Statement and is incorporated herein by this reference.

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PART IV

ITEM 15.    EXHIBITS, FINANCIAL STATEMENT SCHEDULES

(1) Financial Statements			Page No.
	(a)	Report of Independent Registered Public Accounting Firm (PCAOB ID: 238)	54-55
	(b)	Consolidated Statements of Income for the years ended December 31, 2021, 2020 and 2019	56
	(c)	Consolidated Statements of Comprehensive Income for the years ended December 31, 2021, 2020 and 2019	57
	(d)	Consolidated Balance Sheets as of December 31, 2021 and 2020	58-59
	(e)	Consolidated Statements of Cash Flows for the years ended December 31, 2021, 2020 and 2019	61
	(f)	Consolidated Statements of Changes in Equity for the years ended December 31, 2021, 2020 and 2019	62-63
	(g)	Notes to Consolidated Financial Statements	64-100
(2) Financial Statements Schedules
	All schedules have been omitted because of the absence of conditions under which they are required.

(3) Exhibits
	3	Amended and Restated Certificate of Incorporation of ONEOK, Inc., dated July 3, 2017, as amended (incorporated by reference from Exhibit 3.2 to ONEOK, Inc.’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2017, filed November 1, 2017 (File No. 1-13643)).
	3.1	Amended and Restated Bylaws of ONEOK, Inc. (incorporated by reference from Exhibit 3.1 to ONEOK, Inc.’s Current Report on Form 8-K filed February 28, 2022 (File No. 1-13643)).
	4	Certificate of Designation for Convertible Preferred Stock of WAI, Inc. (now ONEOK, Inc.) filed November 21, 2008 (incorporated by reference from Exhibit 3.1 to ONEOK, Inc.’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2012, filed August 1, 2012 (File No. 1-13643)).
	4.1	Certificate of Designation for Series C Participating Preferred Stock of ONEOK, Inc. filed November 21, 2008 (incorporated by reference from Exhibit No. 3.1 to ONEOK, Inc.’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2012, filed August 1, 2012 (File No. 1-13643)).
	4.2	Fifth Supplemental Indenture, dated as of June 30, 2017, by and among ONEOK, Inc., ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership and The Bank of New York Mellon Trust, as trustee (incorporated by reference from Exhibit 4.1 to ONEOK Inc.’s Current Report on Form 8-K filed July 3, 2017 (File No. 1-13643)).
	4.3	Form of Common Stock Certificate (incorporated by reference from Exhibit 1 to ONEOK, Inc.’s Registration Statement on Form 8-A filed November 21, 1997 (File No. 1-13643)).

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4.4	Indenture, dated September 24, 1998, between ONEOK, Inc. and Chase Bank of Texas, as trustee (incorporated by reference from Exhibit 4.1 to ONEOK, Inc.’s Registration Statement on Form S-3 filed August 26, 1998 (File No. 333-62279)).
4.5	Indenture dated December 28, 2001, between ONEOK, Inc. and SunTrust Bank, as trustee (incorporated by reference from Exhibit 4.1 to Amendment No. 1 to ONEOK, Inc.’s Registration Statement on Form S-3 filed December 28, 2001 (File No. 333-65392)).
4.6	Second Supplemental Indenture dated September 25, 1998, between ONEOK, Inc. and Chase Bank of Texas, as trustee, with respect to the 6.875% Debentures due 2028 (incorporated by reference from Exhibit 5(b) to ONEOK, Inc.’s Current Report on Form 8-K/A filed October 2, 1998 (File No. 1-13643)).
4.7	Third Supplemental Indenture, dated as of June 30, 2017, by and among ONEOK, Inc., ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership and U.S. Bank National Association, as trustee (incorporated by reference from Exhibit 4.2 to ONEOK Inc.’s Current Report on Form 8-K filed July 3, 2017 (File No. 1-13643)).
4.8	Thirteenth Supplemental Indenture, dated March 20, 2015, among ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership and Wells Fargo Bank, N.A., as trustee, with respect to the 3.80% Senior Notes due 2020 (incorporated by reference to Exhibit 4.2 to ONEOK Partners, L.P.’s Current Report on Form 8-K filed on March 20, 2015 (File No. 1-12202)).
4.9	Fourteenth Supplemental Indenture, dated March 20, 2015, among ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership and Wells Fargo Bank, N.A., as trustee, with respect to the 4.90% Senior Notes due 2025 (incorporated by reference to Exhibit 4.3 to ONEOK Partners, L.P.’s Current Report on Form 8-K filed on March 20, 2015 (File No. 1-12202)).
4.10	Fourth Supplemental Indenture, dated as of July 13, 2017, by and among ONEOK, Inc., ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership and U.S. Bank National Association, as trustee, with respect to the 4.00% Senior Notes due 2027 (incorporated by reference from Exhibit 4.1 to ONEOK Inc.’s Current Report on Form 8-K filed July 13, 2017 (File No. 1-13643)).
4.11	Fifth Supplemental Indenture, dated as of July 13, 2017, by and among ONEOK, Inc., ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership and U.S. Bank National Association, as trustee, with respect to the 4.95% Senior Notes due 2047 (incorporated by reference from Exhibit 4.2 to ONEOK Inc.’s Current Report on Form 8-K filed July 13, 2017 (File No. 1-13643)).
4.12	Fifteenth Supplemental Indenture, dated as of June 30, 2017, by and among ONEOK Partners, L.P., ONEOK, Inc., ONEOK Partners Intermediate Limited Partnership and Wells Fargo Bank, N.A., as trustee (incorporated by reference from Exhibit 4.1 to ONEOK, Partners, L.P.’s Current Report on Form 8-K filed July 3, 2017 (File No. 1-12202)).
4.13	Certificate of Designation, Preferences and Rights of Series E Non-Voting Perpetual Preferred Stock of ONEOK, Inc. filed April 20, 2017 (incorporated by reference from Exhibit No. 3.1 to ONEOK, Inc.’s Current Report on Form 8-K filed April 20, 2017 (File No. 1-13643)).
4.14	Third Supplemental Indenture, dated June 17, 2005, between ONEOK, Inc. and SunTrust Bank, as trustee, with respect to the 6.00% Senior Notes due 2035 (incorporated by reference from Exhibit 4.3 to ONEOK, Inc.’s Current Report on Form 8-K filed June 17, 2005 (File No. 1-13643)).
4.15	Eleventh Supplemental Indenture, dated September 12, 2013, among ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership and Wells Fargo Bank, N.A., as trustee, with respect to the 5.000% Senior Notes due 2023 (incorporated by reference to Exhibit 4.3 to ONEOK Partners, L.P.’s Current Report on Form 8-K filed September 12, 2013 (File No. 1-12202)).

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4.16	Twelfth Supplemental Indenture, dated September 12, 2013, among ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership and Wells Fargo Bank, N.A., as trustee, with respect to the 6.200% Senior Notes due 2043 (incorporated by reference to Exhibit 4.4 to ONEOK Partners, L.P.’s Current Report on Form 8-K filed September 12, 2013 (File No. 1-12202)).
4.17	Indenture, dated September 25, 2006, between ONEOK Partners, L.P. and Wells Fargo Bank, N.A., as trustee (incorporated by reference to Exhibit 4.1 to ONEOK Partners, L.P.’s Current Report on Form 8-K filed September 26, 2006 (File No. 1-12202)).
4.18	Third Supplemental Indenture, dated September 25, 2006, among ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership and Wells Fargo Bank, N.A., as trustee, with respect to the 6.65% Senior Notes due 2036 (incorporated by reference to Exhibit 4.4 to ONEOK Partners, L.P.’s Current Report on Form 8-K filed September 26, 2006 (File No. 1-12202)).
4.19	Fourth Supplemental Indenture, dated September 28, 2007, among ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership and Wells Fargo Bank, N.A., as trustee, with respect to the 6.85% Senior Notes due 2037 (incorporated by reference to Exhibit 4.2 to ONEOK Partners, L.P.’s Current Report on Form 8-K filed September 28, 2007 (File No. 1-12202)).
4.20	Fifth Supplemental Indenture, dated March 3, 2009, among ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership and Wells Fargo Bank, N.A., as trustee, with respect to the 8.625% Senior Notes due 2019 (incorporated by reference to Exhibit 4.2 to ONEOK Partners, L.P.’s Current Report on Form 8-K filed March 3, 2009 (File No. 1-12202)).
4.21	Ninth Supplemental Indenture, dated September 13, 2012, among ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership and Wells Fargo Bank, N.A., as trustee, with respect to the 3.375% Senior Notes due 2022 (incorporated by reference from Exhibit 4.3 to ONEOK Partners, L.P.’s Current Report on Form 8-K filed September 13, 2012 (File No. 1-12202)).
4.22	Seventh Supplemental Indenture, dated January 26, 2011, among ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership and Wells Fargo Bank, N.A., as trustee, with respect to the 6.125% Senior Notes due 2041 (incorporated by reference from Exhibit 4.3 to ONEOK Partners, L.P.’s Current Report on Form 8-K filed January 26, 2011 (File No. 1-12202)).
4.23	Indenture, dated January 26, 2012, among ONEOK, Inc. and U.S. Bank National Association, as trustee (incorporated by reference to Exhibit 4.1 to ONEOK, Inc.’s Current Report on Form 8-K filed January 26, 2012 (File No. 1-13643)).
4.24	First Supplemental Indenture, dated January 26, 2012, among ONEOK, Inc. and U.S. Bank National Association, as trustee, with respect to the 4.25% Senior Notes due 2022 (incorporated by reference to Exhibit 4.2 to ONEOK, Inc.’s Current Report on Form 8-K filed January 26, 2012 (File No. 1-13643)).
4.25	Second Supplemental Indenture, dated August 21, 2015, between ONEOK, Inc. and U.S. Bank National Association, as trustee, with respect to the 7.50% Notes due 2023 (incorporated by reference to Exhibit 4.1 to ONEOK, Inc.’s Current Report on Form 8-K filed August 21, 2015 (File No. 1-13643)).
4.26	Fourth Supplemental Indenture, dated as of June 30, 2017, by and among ONEOK, Inc., ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership and U.S. Bank National Association, as trustee, with respect to the 6.00% Senior Notes due 2035 (incorporated by reference from Exhibit 4.3 to ONEOK Inc.’s Current Report on Form 8-K filed July 3, 2017 (File No. 1-13643)).
4.27	Sixth Supplemental Indenture, dated as of July 2, 2018, among ONEOK, Inc., ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership and U.S. Bank National Association, as trustee, with respect to the 4.55% Senior Notes due 2028 (incorporated by reference from Exhibit No. 4.1 to ONEOK, Inc.’s Current Report on Form 8-K filed July 2, 2018 (File No. 1-13643)).

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4.28	Seventh Supplemental Indenture, dated as of July 2, 2018, among ONEOK, Inc., ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership and U.S. Bank National Association, as trustee, with respect to the 5.20% Senior Notes due 2048 (incorporated by reference from Exhibit No. 4.2 to ONEOK, Inc.’s Current Report on Form 8-K filed July 2, 2018 (File No. 1-13643)).
4.29	Eighth Supplemental Indenture, dated as of March 13, 2019, among ONEOK, Inc., ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership and U.S. Bank National Association, as trustee, with respect to the 4.35% Senior Notes due 2029 (incorporated by reference from Exhibit No. 4.2 to ONEOK, Inc.’s Current Report on Form 8-K filed March 13, 2019 (File No. 1-13643)).
4.30	Ninth Supplemental Indenture, dated as of March 13, 2019, among ONEOK, Inc., ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership and U.S. Bank National Association, as trustee, with respect to the 5.20% Senior Notes due 2048 (incorporated by reference from Exhibit No. 4.3 to ONEOK, Inc.’s Current Report on Form 8-K filed March 13, 2019 (File No. 1-13643)).
4.31	Tenth Supplemental Indenture, dated as of August 15, 2019, among ONEOK, Inc., ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership and U.S. Bank National Association, as trustee, with respect to the 2.75% Senior Notes due 2024 (incorporated by reference from Exhibit No. 4.1 to ONEOK, Inc.’s Current Report on Form 8-K filed August 15, 2019 (File No. 1-13643)).
4.32	Eleventh Supplemental Indenture, dated as of August 15, 2019, among ONEOK, Inc., ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership and U.S. Bank National Association, as trustee, with respect to the 3.40% Senior Notes due 2029 (incorporated by reference from Exhibit No. 4.2 to ONEOK, Inc.’s Current Report on Form 8-K filed August 15, 2019 (File No. 1-13643)).
4.33	Twelfth Supplemental Indenture, dated as of August 15, 2019, among ONEOK, Inc., ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership and U.S. Bank National Association, as trustee, with respect to the 4.45% Senior Notes due 2049 (incorporated by reference from Exhibit No. 4.3 to ONEOK, Inc.’s Current Report on Form 8-K filed August 15, 2019 (File No. 1-13643)).
4.34	Thirteenth Supplemental Indenture, dated as of March 10, 2020, among ONEOK, Inc., ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership and U.S. Bank National Association, as trustee, with respect to the 2.200% Senior Notes due 2025 (incorporated by reference from Exhibit No. 4.1 to ONEOK, Inc.’s Current Report on Form 8-K filed March 10, 2020 (File No. 1-13643)).
4.35	Fourteenth Supplemental Indenture, dated as of March 10, 2020, among ONEOK, Inc., ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership and U.S. Bank National Association, as trustee, with respect to the 3.100% Senior Notes due 2030 (incorporated by reference from Exhibit No. 4.2 to ONEOK, Inc.’s Current Report on Form 8-K filed March 10, 2020 (File No. 1-13643)).
4.36	Fifteenth Indenture, dated as of March 10, 2020, among ONEOK, Inc., ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership and U.S. Bank National Association, as trustee, with respect to the 4.500% Senior Notes due 2050 (incorporated by reference from Exhibit No. 4.3 to ONEOK, Inc.’s Current Report on Form 8-K filed March 20, 2020 (File No. 1-13643)).
4.37	Sixteenth Supplemental Indenture, dated as of May 7, 2020, among ONEOK, Inc., ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership and U.S. Bank National Association, as trustee, with respect to the 5.850% Senior Notes due 2026 (incorporated by reference from Exhibit No. 4.1 to ONEOK, Inc.’s Current Report on Form 8-K filed May 7, 2020 (File No. 1-13643)).
4.38	Seventeenth Supplemental Indenture, dated as of May 7, 2020, among ONEOK, Inc., ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership and U.S. Bank National Association, as trustee, with respect to the 6.350% Senior Notes due 2031 (incorporated by reference from Exhibit No. 4.2 to ONEOK, Inc.’s Current Report on Form 8-K filed May 7, 2020 (File No. 1-13643)).

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4.39	Eighteenth Supplemental Indenture, dated as of May 7, 2020, among ONEOK, Inc., ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership and U.S. Bank National Association, as trustee, with respect to the 7.150% Senior Notes due 2051 (incorporated by reference from Exhibit No. 4.3 to ONEOK, Inc.’s Current Report on Form 8-K filed May 7, 2020 (File No. 1-13643)).
4.40	Description of securities (incorporated by reference from Exhibit 4.43 to ONEOK, Inc.'s Annual Report on Form 10-K for the fiscal year ended December 31, 2020, filed February 23, 2021 (File No. 1-13643)).
10	ONEOK, Inc. Long-Term Incentive Plan (incorporated by reference from Exhibit 10(a) to ONEOK, Inc.’s Annual Report on Form 10-K for the fiscal year ended December 31, 2001, filed March 14, 2002 (File No. 1-13643).
10.1	ONEOK, Inc. Stock Compensation Plan for Non-Employee Directors (incorporated by reference from Exhibit 99 to ONEOK, Inc.’s Registration Statement on Form S-8 filed January 25, 2001 (File No. 333-54274)).
10.2	ONEOK, Inc. Supplemental Executive Retirement Plan terminated and frozen December 31, 2004 (incorporated by reference from Exhibit 10.1 to ONEOK, Inc.’s Current Report on Form 8-K filed December 20, 2004 (File No. 1-13643)).
10.3	ONEOK, Inc. 2005 Supplemental Executive Retirement Plan, as amended and restated, dated December 18, 2008 (incorporated by reference from Exhibit 10.3 to ONEOK, Inc.’s Annual Report on Form 10-K for the fiscal year ended December 31, 2008, filed February 25, 2009 (File No. 1-13643)).
10.4	Credit Agreement, dated as of April 18, 2017, among ONEOK, Inc., Citibank, N.A., as administrative agent, a swingline lender, a letter of credit issuer and a lender, and the other lenders, swingline lenders and letter of credit issuers parties thereto (incorporated by reference from Exhibit 10.1 to ONEOK, Inc.’s Current Report on Form 8-K filed April 19, 2017 (File No. 1-13643)).
10.5	Form of Indemnification Agreement between ONEOK, Inc. and ONEOK, Inc. officers and directors, as amended (incorporated by reference from Exhibit 10.5 to ONEOK, Inc.’s Annual Report on Form 10-K for the fiscal year ended December 31, 2014, filed February 25, 2015 (File No. 1-13643)).
10.6	Amended and Restated ONEOK, Inc. Annual Officer Incentive Plan (incorporated by reference from Exhibit 10.1 to ONEOK, Inc.’s Current Report on Form 8-K filed May 27, 2009 (File No. 1-13643)).
10.7	ONEOK, Inc. Employee Nonqualified Deferred Compensation Plan, as amended and restated December 16, 2004 (incorporated by reference from Exhibit 10.3 to ONEOK, Inc.’s Current Report on Form 8-K filed December 20, 2004 (File No. 1-13643)).
10.8	ONEOK, Inc. 2005 Nonqualified Deferred Compensation Plan, as amended and restated, dated December 18, 2008 (incorporated by reference from Exhibit 10.8 to ONEOK, Inc.’s Annual Report on Form 10-K for the fiscal year ended December 31, 2008, filed February 25, 2009 (File No. 1-13643)).
10.9	ONEOK, Inc. Deferred Compensation Plan for Non-Employee Directors, as amended and restated, dated December 18, 2008 (incorporated by reference from Exhibit 10.9 to ONEOK, Inc.’s Annual Report on Form 10-K for the fiscal year ended December 31, 2008, filed February 25, 2009 (File No. 1-13643)).
10.10	Guaranty Agreement, dated as of June 30, 2017, by and between ONEOK Partners, L.P. and ONEOK Partners Intermediate Limited Partnership, in favor of Citibank, N.A., as administrative agent, under the Credit Agreement, dated as of April 18, 2017, by and among ONEOK, Inc., Citibank, N.A. and the other lenders parties thereto (incorporated by reference from Exhibit 10.1 to ONEOK, Inc.’s Current Report on Form 8-K filed July 3, 2017 (File No. 1-13643)).

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10.11	Extension Agreement, dated as of June 18, 2018, among ONEOK, Inc., Citibank, N.A., as administrative agent, a swingline lender, a letter of credit issuer and a lender, and the other lenders, swingline lenders and letter of credit issuers parties thereto (incorporated by reference from Exhibit No. 10.1 to ONEOK, Inc.’s Current Report on Form 8-K filed June 18, 2018 (File No. 1-13643)).
10.12	First Amendment and Extension Agreement, dated as of May 24, 2019, among ONEOK, Inc., Citibank, N.A., as administrative agent, a swingline lender, a letter of credit issuer and a lender, and the other lenders, swingline lenders and letter of credit issuers parties thereto (incorporated by reference from Exhibit No. 10.1 to ONEOK, Inc.’s Current Report on Form 8-K filed May 29, 2019 (File No. 1-13643)).
10.13	Amended and Restated Limited Liability Company Agreement of Overland Pass Pipeline Company LLC entered into between ONEOK Overland Pass Holdings, L.L.C. and Williams Field Services Company, LLC dated May 31, 2006 (incorporated by reference to Exhibit 10.6 to ONEOK Partners, L.P.’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2006, filed August 4, 2006 (File No. 1-12202)).
10.14	Form of ONEOK, Inc. Officer Change in Control Severance Plan (incorporated by reference from Exhibit 10.1 to ONEOK, Inc.’s Current Report on Form 8-K filed July 22, 2011 (File No. 1-13643)).
10.15	Form of 2018 Restricted Unit Stock Award Agreement dated February 21, 2018 (incorporated by reference to Exhibit 10.17 to ONEOK, Inc.’s Annual Report on Form 10-K filed on February 27, 2018 (File No. 1-13643)).
10.16	Form of 2018 Performance Unit Award Agreement dated February 21, 2018 (incorporated by reference to Exhibit 10.18 to ONEOK, Inc.’s Annual Report on Form 10-K filed on February 27, 2018 (File No. 1-13643)).
10.17	Form of 2022 Restricted Unit Stock Award Agreement dated February 23, 2022.
10.18	Form of 2022 Performance Unit Award Agreement dated February 23, 2022.
10.19	Term Loan Agreement, dated as of November 19, 2018, among ONEOK, Inc., Mizuho Bank, Ltd., as administrative agent and a lender, and the other lenders parties thereto (incorporated by reference from Exhibit No. 10.1 to ONEOK, Inc.’s Current Report on Form 8-K filed November 21, 2018 (File No. 1-13643)).
10.20	Guaranty Agreement, dated as of November 19, 2018, by ONEOK Partners Intermediate Limited Partnership and ONEOK Partners, L.P. in favor of Mizuho Bank, Ltd., as administrative agent, under the above-referenced Term Loan Agreement (incorporated by reference from Exhibit No. 10.2 to ONEOK, Inc.’s Current Report on Form 8-K filed November 21, 2018 (File No. 1-13643)).
10.21	ONEOK, Inc. Equity Incentive Plan (incorporated by reference to Appendix A to ONEOK, Inc.’s definitive proxy statement on Schedule 14A filed on April 5, 2018 (File No. 1-13643)).
10.22	ONEOK, Inc. Profit Sharing Plan, dated January 1, 2005 (incorporated by reference from Exhibit 99 to ONEOK, Inc.’s Registration Statement on Form S-8 filed December 30, 2004 (File No. 333-121769)).
10.23	ONEOK, Inc. Equity Compensation Plan, as amended and restated, dated December 18, 2008 (incorporated by reference from Exhibit 10.44 to ONEOK, Inc.’s Annual Report on Form 10-K for the fiscal year ended December 31, 2008, filed February 25, 2009 (File No. 1-13643)).

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10.24	Equity Distribution Agreement, dated July 23, 2020, among ONEOK, Inc., and Credit Suisse Securities (USA) LLC, BofA Securities, Inc., Goldman Sachs & Co. LLC, Mizuho Securities USA LLC, Morgan Stanley & Co. LLC, RBC Capital Markets, LLC, Scotia Capital (USA) Inc., SMBC Nikko Securities America, Inc., SunTrust Robinson Humphrey, Inc. and TD Securities (USA) LLC as sales agents, principals and/or forward sellers, and Credit Suisse Capital LLC, Bank of America, N.A., Goldman Sachs & Co. LLC, Mizuho Markets Americas LLC, Morgan Stanley & Co. LLC, Royal Bank of Canada, The Bank of Nova Scotia and The Toronto-Dominion Bank as forward purchasers (incorporated by reference from Exhibit 1.1 to ONEOK, Inc.’s Current Report on Form 8-K with a filing date of July 24, 2020 (File No. 1-13643)).
10.25	Form of Master Forward Confirmation (incorporated by reference from Exhibit 1.2 to ONEOK Inc.’s Current Report on Form 8-K with a filing date of July 24, 2020 (File No. 1-13643)).
10.26	Second Amendment to Credit Agreement, dated as of June 26, 2020, among ONEOK, Inc., Citibank, N.A., as administrative agent, a swingline lender, a letter of credit issuer and a lender, and the other lenders, swingline lenders and letter of credit issuers parties thereto (incorporated by reference from Exhibit 10.1 to ONEOK Inc.’s Current Report on Form 8-K, filed June 30, 2020 (File No. 1-13643).
10.27	Form of 2019 Restricted Unit Award Agreement, dated February 20, 2019 (incorporated by reference to Exhibit 10.54 to ONEOK, Inc.’s Annual Report on Form 10-K for the fiscal year ended December 31, 2018, filed February 26, 2019 (File No. 1-13643)).
10.28	Form of 2019 Performance Unit Award Agreement, dated February 20, 2019 (incorporated by reference to Exhibit 10.55 to ONEOK Inc.’s Annual Report on Form 10-K for the fiscal year ended December 31, 2018, filed February 26, 2019 (File No. 1-13643)).
10.29	Form of 2021 Restricted Unit Award Agreement (incorporated by reference from Exhibit 10.33 to ONEOK, Inc's Annual Report on Form 10-K for the fiscal year ended December 31, 2020, filed February 23, 2021 (File No. 1-13643))
10.30	Form of 2021 Performance Unit Award Agreement (incorporated by reference from Exhibit 10.34 to ONEOK, Inc's Annual Report on Form 10-K for the fiscal year ended December 31, 2020, filed February 23, 2021 (File No. 1-13643))
10.31	Form of 2020 Restricted Unit Award Agreement (incorporated by reference to Exhibit 10.35 to ONEOK, Inc.’s Annual Report on Form 10-K for the fiscal year ended December 31, 2019, filed February 25, 2020 (File No. 1-13643)).
10.32	Form of 2020 Performance Unit Award Agreement (incorporated by reference to Exhibit 10.36 to ONEOK, Inc.’s Annual Report on Form 10-K for the fiscal year ended December 31, 2019, filed February 25, 2020 (File No. 1-13643)).
10.33	ONEOK, Inc. Employee Stock Purchase Plan as amended and restated effective May 23, 2012 (incorporated by reference to Exhibit 10.2 to ONEOK, Inc.’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2012, filed August 1, 2012 (File No. 1-13643)).
10.34	Form of First Amendment to 2019 Performance Unit Award Agreement (incorporated by reference to Exhibit 10.38 to ONEOK, Inc.’s Annual Report on Form 10-K for the fiscal year ended December 31, 2019, filed February 25, 2020 (File No. 1-13643)).
10.35	Form of First Amendment to 2018 Performance Unit Award Agreement (incorporated by reference to Exhibit 10.39 to ONEOK, Inc.’s Annual Report on Form 10-K for the fiscal year ended December 31, 2019, filed February 25, 2020 (File No. 1-13643)).

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10.36	ONEOK, Inc. 2020 Nonqualified Deferred Compensation Plan dated July 24, 2019, and effective as of January 1, 2020 (incorporated by reference from Exhibit 10.40 to ONEOK, Inc’s Annual Report on Form 10-K for the fiscal year ended December 31, 2020, filed February 23, 2021 (File No. 1-13643))
10.37	Form of ONEOK, Inc. Equity Incentive Plan Restricted Unit Award Agreement (Make-Whole Award) between ONEOK, Inc. and Pierce H. Norton II (incorporated by reference to Exhibit 10.1 to ONEOK, Inc.’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2021, filed August 4, 2021 (File No. 1-13643)).
21	Required information concerning the registrant’s subsidiaries.
22	List of subsidiary guarantors and issuers of guaranteed securities.
23	Consent of Independent Registered Public Accounting Firm - PricewaterhouseCoopers LLP.
31.1	Certification of Pierce H. Norton II pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
31.2	Certification of Walter S. Hulse III pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
32.1	Certification of Pierce H. Norton II pursuant to 18 U.S.C. Section 1350 as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 (furnished only pursuant to Rule 13a-14(b)).
32.2	Certification of Walter S. Hulse III pursuant to 18 U.S.C. Section 1350 as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 (furnished only pursuant to Rule 13a-14(b)).
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101.PRE	Inline XBRL Taxonomy Presentation Linkbase Document.
104	Cover Page Interactive Data File (formatted in Inline XBRL and contained in Exhibit 101).

Attached as Exhibit 101 to this Annual Report are the following Inline XBRL-related documents: (i) Document and Entity Information; (ii) Consolidated Statements of Income for the years ended December 31, 2021, 2020 and 2019; (iii) Consolidated Statements of Comprehensive Income for the years ended December 31, 2021, 2020 and 2019; (iv) Consolidated Balance Sheets at December 31, 2021 and 2020; (v) Consolidated Statements of Cash Flows for the years ended December 31, 2021, 2020 and 2019; (vi) Consolidated Statements of Changes in Equity for the years ended December 31, 2021, 2020 and 2019; and (vii) Notes to Consolidated Financial Statements.

ITEM 16.    FORM 10-K SUMMARY

None.

110

Table of Contents

Signatures

Pursuant to the requirements of Section 13 or 15(d) of the Exchange Act, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

	ONEOK, Inc.
	Registrant
Date: March 1, 2022	By:	/s/ Walter S. Hulse III
		Walter S. Hulse III
		Chief Financial Officer, Treasurer and
		Executive Vice President, Strategy
		and Corporate Affairs
		(Principal Financial Officer)

Pursuant to the requirements of the Exchange Act, this report has been signed below by the following persons on behalf of the registrant and in the capacities indicated on this 1st day of March 2022.

/s/ John W. Gibson	/s/ Pierce H. Norton
John W. Gibson	Pierce H. Norton
Chairman of the Board	President, Chief Executive Officer and
	Director
/s/ Walter S. Hulse III	/s/ Mary M. Spears
Walter S. Hulse III	Mary M. Spears
Chief Financial Officer, Treasurer and	Vice President and
Executive Vice President, Strategy	Chief Accounting Officer
and Corporate Affairs
/s/ Brian L. Derksen	/s/ Julie H. Edwards
Brian L. Derksen	Julie H. Edwards
Director	Director
/s/ Mark W. Helderman	/s/ Randall J. Larson
Mark W. Helderman	Randall J. Larson
Director	Director
/s/ Steven J. Malcolm	/s/ Jim W. Mogg
Steven J. Malcolm	Jim W. Mogg
Director	Director
/s/ Pattye L. Moore	/s/ Eduardo A. Rodriguez
Pattye L. Moore	Eduardo A. Rodriguez
Director	Director
/s/ Gerald B. Smith
Gerald B. Smith
Director

111

EX-10.17

{00138539 2 } ONEOK, INC. EQUITY INCENTIVE PLAN RESTRICTED UNIT AWARD AGREEMENT This Restricted Unit Award Agreement (the “Agreement”) is entered into as of the ____ day of __________, 2022 by and between ONEOK, Inc. (the “Company”) and «Employee_Name» (the “Grantee”), an employee of the Company or a Subsidiary thereof, pursuant to the terms of the ONEOK, Inc. Equity Incentive Plan (the “Plan”). 1. Restricted Unit Award. This Agreement and the Notice of Restricted Unit Award and Agreement dated February 23, 2022, a copy of which is attached hereto and incorporated herein by reference, establishes the terms and conditions for the Company’s grant of an Award of «No_of_Restricted_Units» Restricted Units (the “Award”) to the Grantee pursuant to the Plan. This Agreement, when executed by the Grantee, constitutes an agreement between the Company and the Grantee. Capitalized terms not defined in this Agreement shall have the meaning ascribed to them in the Plan. 2. Restricted Period; Vesting. The Restricted Units granted pursuant to the Award will vest in accordance with the following terms and conditions: (a) Grantee’s rights with respect to the Restricted Units shall be restricted during the period beginning February 23, 2022 (the “Grant Date”), and ending on February 23, 2025 (the “Restricted Period”). (b) Except as otherwise provided in this Agreement or the Plan, the Grantee shall vest in the Restricted Units granted by this Award (including any Dividend Equivalents, as described below) at the end of the Restricted Period if the Grantee’s employment by the Company does not terminate during the Restricted Period. Upon vesting, the Grantee shall become entitled to receive one (1) share of the Company’s common stock (“Common Stock”) for each such Restricted Unit. No fractional shares shall be issued, and any amount attributable to a fractional share shall instead be withheld to satisfy any withholding tax obligation. (c) If the Grantee’s employment with the Company terminates prior to the end of the Restricted Period by reason of (i) voluntary termination other than Retirement or (ii) involuntary Termination for Cause, the Grantee shall forfeit all right, title and interest in the Restricted Units and any Common Stock otherwise payable pursuant to this Agreement. For purposes of this Agreement, employment with any Subsidiary of the Company shall be treated as employment with the Company. Likewise, a termination of employment shall not be deemed to occur by reason of a transfer of employment between the Company and any Subsidiary. (d) In the event of termination of the Grantee’s employment with the Company during the Restricted Period by reason of (i) involuntary termination other than a Termination for Cause, (ii) Retirement, (iii) Disability or (iv) death, then the Grantee shall be partially vested in, and the Grantee shall be entitled to receive the Restricted Units, prorated for the period of time which has elapsed under the Restricted Period through the date of the Grantee’s termination of employment. Exhibit 10.17

{00138539 2 } - 2 - (e) Unless the Committee provides otherwise prior to a Change in Control, in the event of a Change in Control (as defined below), the vesting or forfeiture of the Restricted Units will be subject to the terms and conditions of Article 11 of the Plan. (f) For purposes of the Award and this Agreement, the term “voluntary termination” shall mean that the Grantee had an opportunity to continue employment with the Company, but did not do so. An “involuntary termination” shall mean that the Company has ended the Grantee’s employment without the Grantee having an opportunity to continue employment with the Company. A “Termination for Cause” of the Grantee’s employment shall mean that the Company has ended such employment by reason of (i) the Grantee’s conviction in a court of law of a felony, or any crime or offense involving misuse or misappropriation of money or property, (ii) the Grantee’s violation of any covenant, agreement or obligation not to disclose confidential information regarding the business of the Company, (iii) any violation by the Grantee of any covenant not to compete with the Company, (iv) any act of dishonesty by the Grantee which adversely effects the business of the Company, (v) any willful or intentional act of the Grantee which adversely affects the business of, or reflects unfavorably on the reputation of the Company, including any material breach of a Company policy (determined in the discretion of the Company) (vi) the Grantee’s use of alcohol or drugs which interferes with the Grantee’s duties as an employee of the Company, or (vii) the Grantee’s failure or refusal to perform the specific directives of the Company’s Board of Directors or officers. “Retirement” shall mean a voluntary termination of employment with the Company if the Grantee has both completed five (5) years of service with the Company and attained age fifty (50). “Years of service” for this purpose excludes any service with any predecessor employer that was not considered within the controlled group (determined in accordance with Code section 414(c)) of the Company as of the date of the grant, unless explicitly required by the agreement executed in connection with such asset or stock acquisition, merger or other similar transaction “Disability” shall have the meaning provided in the Plan. The term “Change in Control” shall have the meaning provided in the Plan unless the Award is or becomes subject to Code Section 409A, in which event the term “Change in Control” shall mean a Change in Control as defined in the Plan that also qualifies as a “change in control event” as defined in Treasury Regulations Section 1.409A-3(i)(5). 3. Dividend Equivalents. During the Restricted Period, before payment or forfeiture of the Award, the Award will be increased by a number of additional Restricted Units (“Dividend Equivalents”) representing all cash dividends that would have been paid to the Grantee if one share of Common Stock had been issued to the Grantee on the Grant Date for each Restricted Unit granted pursuant to this Agreement. The Dividend Equivalents credited during the Restricted Period will include fractional shares; provided, however, the shares of Common Stock actually issued upon vesting of the Dividend Equivalents shall be paid only in whole shares of Common Stock, and any fractional shares of Common Stock in an amount of cash equal to the Fair Market Value of such fractional shares of Common Stock shall be withheld to satisfy any withholding tax obligation. Dividend Equivalents shall be subject to the same vesting provisions and other terms and conditions of this Agreement, and shall be paid on the same date, as the Restricted Units to which they are attributable. Moreover, references in this Agreement to Restricted Units shall be deemed to include any Restricted Units attributable to Dividend Equivalents.

{00138539 2 } - 3 - 4. Non-Transferability of Restricted Units. (a) The Restricted Units may not be sold, assigned, transferred, pledged, encumbered or otherwise disposed of by Grantee or any other person until the expiration of the Restricted Period. Any such attempt shall be wholly ineffective and will result in immediate forfeiture of all such amounts. (b) Notwithstanding the foregoing, the Grantee may transfer any part or all rights in the Restricted Units to members of the Grantee’s immediate family, to one or more trusts for the benefit of such immediate family members or to partnerships in which such immediate family members are the only partners, in each case only if the Grantee does not receive any consideration for the transfer. In the event of any such transfer, the Restricted Units shall remain subject to the terms and conditions of this Agreement. For any such transfer to be effective, the Grantee must provide prior written notice thereof to the Committee, unless otherwise authorized and approved by the Committee, in its sole discretion; and the Grantee shall furnish to the Committee such information as it may request with respect to the transferee and the terms and conditions of any such transfer. For purposes of this Agreement, “immediate family” shall mean the Grantee’s spouse, children and grandchildren. (c) The Grantee also may designate a Beneficiary, using the form attached hereto as Exhibit A or such other form as may be approved by the Committee, to receive any rights of the Grantee which may become vested in the event of the death of the Grantee under procedures and in the form established by the Committee. In the absence of such designation of a Beneficiary, any such rights shall be deemed to be transferred to the estate of the Grantee. 5. Distribution of Common Stock. Subject to Section 13 of this Agreement, the Common Stock or cash the Grantee becomes entitled to receive upon vesting of any Restricted Units shall be distributed to the Grantee as soon as practicable after the vesting date for such Restricted Units, as determined by the Committee in its discretion, but in no event later than 75 days after the vesting date. The Grantee shall not be permitted, directly or indirectly, to designate the form of payment or the taxable year in which any payment is to be made. 6. Administration of Award; Ratification of Actions. The Award shall be subject to such other rules as the Committee, in its sole discretion, may determine to be appropriate with respect to administration thereof. This Agreement shall be subject to discretionary interpretation and construction by the Committee. Day-to-day authority and responsibility for administration of the Plan, the Award and this Agreement have been delegated to the Company’s Benefit Plan Administration Committee and its authorized representatives, and all actions taken thereby shall be entitled to the same deference as if taken by the Committee itself. The Grantee shall take all actions and execute and deliver all documents as may from time to time be requested by the Committee. By receiving this Award or other benefit under the Plan, Grantee and each person claiming under or through Grantee shall conclusively be deemed to have indicated acceptance and ratification of, and consent to, any action taken under the Plan or the Award by the Company, the Board, the Committee or the Benefit Plan Administration Committee. 7. Tax Liability and Withholding. The Grantee agrees to pay to the Company any applicable federal, state or local income, employment, social security, Medicare or other

{00138539 2 } - 4 - withholding tax obligation arising in connection with the Award to the Grantee, which the Company shall determine; and the Company shall have the right, without the Grantee’s prior approval or direction, to satisfy such withholding tax by withholding all or any part of the Common Stock or cash that would otherwise be distributed or paid to the Grantee, with any shares of Common Stock so withheld to be valued at the Fair Market Value on the date of such withholding. The Grantee, with the consent of the Company, may satisfy such withholding tax by transferring cash or Common Stock to the Company, with any shares of Common Stock so transferred to be valued at the Fair Market Value on the date of such transfer. Any payment of required withholding taxes in the form of Common Stock shall not exceed the maximum amount of tax that may be required to be withheld by law (or such other amount that would result in an accounting charge with respect to such shares used to pay such taxes). Income tax withholding shall occur on the date of actual distribution. Notwithstanding the foregoing, the ultimate liability for Grantee’s share of all tax withholding is the Grantee’s responsibility, and the Company makes no tax-related representations in connection with the grant or vesting of Restricted Units or the distribution of Common Stock or cash to Grantee. 8. Adjustment Provisions. If, prior to the expiration of the Restricted Period, any change is made to the outstanding Common Stock or in the capitalization of the Company, the Restricted Units granted pursuant to this Award shall be equitably adjusted or terminated to the extent and in the manner provided under the terms of the Plan. 9. Clawbacks, Insider Trading and Other Company Policies. The Grantee acknowledges and agrees that this Award is subject to all applicable clawback or recoupment, insider trading, share ownership and retention and other policies that the Company’s Board of Directors may adopt from time to time. Notwithstanding anything in the Plan or this Agreement to the contrary, all or a portion of the Award made to the Grantee under this Agreement is subject to being called for repayment to the Company or reduced in any situation where the Board of Directors or a Committee thereof determines that fraud, negligence, or intentional misconduct by the Grantee was a contributing factor to the Company having to restate all or a portion of its financial statement(s). The Committee may determine whether the Company shall effect any such repayment or reduction: (i) by seeking repayment from the Grantee, (ii) by reducing (subject to applicable law and the terms and conditions of the Plan or any other applicable plan, program, policy or arrangement) the amount that would otherwise be awarded or payable to the Grantee under the Award, the Plan or any other compensatory plan, program, or arrangement maintained by the Company, (iii) by withholding payment of future increases in compensation (including the payment of any discretionary bonus amount) or grants of compensatory awards that would otherwise have been made in accordance with the Company's otherwise applicable compensation practices, or (iv) by any combination of the foregoing. The determination regarding the Grantee’s conduct, and repayment or reduction under this provision shall be within the sole discretion of the Committee and shall be final and binding on the Grantee and the Company. The Grantee, in consideration of the grant of the Award, and by the Grantee's execution of this Agreement, acknowledges the Grantee's understanding of this provision and hereby agrees to make and allow an immediate and complete repayment or reduction in accordance with this provision in the event of a call for repayment or other action by the Company or Committee to effect its terms with respect to the Grantee, the Award and/or any other compensation described in this Agreement.

{00138539 2 } - 5 - 10. Stock Reserved. The Company shall at all times during the term of the Award reserve and keep available such number of shares of its Common Stock as will be sufficient to satisfy the Award issued and granted to Grantee and the terms stated in this Agreement. It is intended by the Company that the Plan and shares of Common Stock covered by the Award are to be registered under the Securities Act of 1933, as amended, prior to the grant date; provided, that in the event such registration is for any reason not effective for such shares, the Grantee agrees that all shares acquired pursuant to the grant will be acquired for investment and will not be available for sale or tender to any third party. 11. No Rights as Shareholder. The issuance and transfer of Common Stock shall be subject to compliance by the Company and the Grantee with all applicable laws, rules, regulations and approvals. No shares of Common Stock shall be issued or transferred unless and until any then-applicable legal requirements have been fully met or obtained to the satisfaction of the Company and its counsel. Except as otherwise provided in this Agreement, the Grantee shall have no rights as a shareholder of the Company in respect of the Restricted Units or Common Stock for which the Award is granted. The Grantee shall not be considered a record owner of shares of Common Stock with respect to the Restricted Units until the Common Stock is actually distributed to Grantee. 12. Continued Employment; Employment at Will. In consideration of the Company’s granting the Award as incentive compensation to Grantee pursuant to this Agreement, the Grantee agrees to all of the terms of this Agreement and to continue to perform services for the Company in a satisfactory manner as directed by the Company. Provided, however, no provision in this Agreement shall confer any right to the Grantee’s continued employment, limit the right of the Company to terminate the Grantee’s employment at any time or create any contractual right to receive any future awards under the Plan. Moreover, unless specifically provided under the terms thereof, the value of the Award will not be included as compensation or earnings when calculating the Grantee’s benefits under any employee benefit plan sponsored by the Company. 13. Code Section 409A. This Award and Agreement are intended to comply with Code Section 409A or an exemption therefrom and shall be construed and interpreted in a manner that is consistent with the requirements for avoiding additional taxes or penalties under Code Section 409A. Notwithstanding any other provision of the Agreement, any distributions or payments due hereunder that are subject to Code Section 409A may only be made upon an event and in a manner permitted by Code Section 409A. “Termination of employment” or words of similar import used in this Agreement shall mean, with respect to any payments of deferred compensation subject to Code Section 409A, a “separation from service” as defined in Code Section 409A. Each payment of compensation under this Agreement, including installment payments, shall be treated as a separate payment of compensation for purposes of applying Code Section 409A. Except as permitted under Code Section 409A, Grantee may not, directly or indirectly, designate the calendar year of settlement, distribution or payment. To the extent that an Award is or becomes subject to Code Section 409A and Grantee is a Specified Employee (within the meaning of Code Section 409A) who becomes entitled to a distribution on account of a separation from service, no payment shall be made before the date which is six (6) months after the date of the Grantee's separation from service or, if earlier, the date of Grantee’s death (the “Delayed Payment Date”), if required by Code Section 409A. The accumulated amounts shall be distributed or paid in a lump sum payment on the Delayed Payment Date unless the Delayed Payment Date is the date of the

{00138539 2 } - 6 - Grantee’s death, in which event the accumulated amounts shall be paid in a lump sum payment by December 31 following the year of Grantee’s death. Notwithstanding the foregoing, the Company makes no representations that the payments and benefits provided under this Agreement comply with Code Section 409A and shall not be liable for all or any taxes, penalties, interest or other expenses that may be incurred by the Grantee on account of non-compliance with Code Section 409A. 14. Entire Agreement; Severability; Conflicts. This Agreement contains the entire terms of the Award, and may not be changed other than by a written instrument executed by both parties or an amendment of the Plan, except where such change or modification does not adversely affect in a material way the terms of this Agreement, as provided in Section 15.4 of the Plan. This Agreement supersedes any prior agreements or understandings, and there are no other agreements or understandings relating to its subject matter. The invalidity or unenforceability of any provision of the Plan or this Agreement shall not affect any other provision of the Plan or this Agreement, and each provision of the Plan and this Agreement shall be severable and enforceable to the extent permitted by law. Should there be any inconsistency between the provisions of this Agreement and the terms of the Award as stated in the resolutions and records of the Board of Directors or the Plan, the provisions of such resolutions and records of the Board of Directors and the Plan shall control. 15. Successors and Assigns. The Award evidenced by this Agreement shall inure to the benefit of and be binding upon the heirs, legatees, legal representatives, successors, and assigns of the parties hereto. 16. Governing Law; Mandatory Claims Procedures. This Agreement shall be construed in accordance with, and subject to, the laws of the State of Oklahoma applicable to contracts made and to be entirely performed in Oklahoma and wholly disregarding any choice of law provisions or conflict of law principles that might otherwise be contrary to this express intent. If Grantee or any person acting on Grantee’s behalf (the “Claimant”) has any claim or dispute related in any way to the Award or to the Plan, the Claimant must follow the claims and arbitration procedures set forth in Article 13 of the Plan. All claims must be brought no later than one year following the date on which the facts forming the basis of the claim are known or should have been known by the claimant, whichever is earlier. Any claim that is not submitted within the applicable time limit shall be waived. The Grantee hereby acknowledges receipt of this Agreement, the Notice of Restricted Unit Award and Agreement and a copy of the Plan, and accepts the Award under the terms and conditions stated in this Agreement, subject to all terms and provisions of the Plan, by signing this Agreement as of the date indicated. In the absences of a signed acceptance, the Grantee will be deemed to have accepted this Award on the Grant Date, and all its associated terms and conditions, including the mandatory claims and arbitration procedures, unless the Grantee notifies the Company of the Grantee’s non-acceptance of the Award by contacting the stock plan administrator, in writing within sixty (60) days of the Grant Date. Date «Employee_Name» Grantee

{00138539 2 } - 7 - Exhibit A Beneficiary Designation Form I, _________________________________ (“Plan Participant”), state that I am a participant in the ONEOK, Inc. Equity Incentive Plan,the ONEOK, Inc. Equity Compensation Plan, or any other stock compensation plan sponsored by ONEOK, Inc. (individually and collectively, the “Plan”), and the holder of one or more Awards granted to me under the Plan. With the understanding that I may change the following beneficiary designations at any time by furnishing written notice thereof to the Committee (provided that such change does not affect the time and form of payment of any amounts subject to an existing deferral election), I hereby designate the following individuals (or entities) as my beneficiaries to receive any and all benefits payable to me under the Plan and to exercise all rights, benefits and features of the Awards described below, in accordance with the terms of the Plan and any associated award agreement, in the event of my death as follows: 1. Primary Beneficiary (Beneficiaries) The Primary Beneficiaries named below shall have first priority to any and all Awards described below and to exercise all rights, benefits and features of the Awards described below, in accordance with the terms of the Plan and any associated award agreement, in the event of my death. Name Relationship SSN Percentage of Total If a designated Primary Beneficiary named dies or ceases to exist prior to receiving the share designated for such Primary Beneficiary, such share shall be transferred proportionately to other surviving and existing designated Primary Beneficiaries. 2. Contingent Beneficiary (or Beneficiaries) The Contingent Beneficiaries named below, if any, shall receive all Awards described below and to exercise, enjoy and receive all rights, benefits and features of the Awards described below (including Awards that I have elected to defer under the Plan or the ONEOK, Inc. 2005 Nonqualified Deferred Compensation Plan, if applicable) in accordance with the Plan and the terms and provisions of such Awards in the event of my death if no Primary Beneficiary named above survives me or exists. Name Relationship SSN Percentage of Total

{00138539 2 } - 8 - 3. Awards Covered By Beneficiary Designation This Beneficiary Designation is applicable to and covers the following Awards: (Check one) _______ All Awards previously granted to me under the Plan and all Awards to be granted to me under the Plan in the future; or _______ The following Awards that have been granted to me under the Plan: (List Awards Covered) Award Grant Date Number of Shares of Stock 4. General Terms This instrument does not modify, extend or increase any rights or benefits otherwise provided for by any Award under the Plan. All terms used in this instrument shall have the meaning provided for under the Plan, unless otherwise indicated herein. This instrument is not applicable to Common Stock of ONEOK, Inc. that I have acquired outright and without any restrictions or limitations under the Plan prior to my death. This instrument revokes and supersedes any prior designation of a Beneficiary (or Beneficiaries) made by me with respect to the Awards covered by this Beneficiary Designation as set forth in Paragraph 3. IN WITNESS WHEREOF, I have signed this instrument this day of ____________, __________. Plan Participant __________________________________ Witness __________________________________ Witness RECEIVED AND ACKNOWLEDGED this ____ day of ________, 20__, ______________________________________ For the Committee

EX-10.18

{00138451 2 } 1 ONEOK, INC. EQUITY INCENTIVE PLAN PERFORMANCE UNIT AWARD AGREEMENT This Performance Unit Award Agreement (the “Agreement”) is entered into as of the __ day of _______, 2022, by and between ONEOK, Inc. (the “Company”) and «Employee_Name» (the “Grantee”), an employee of the Company or a Subsidiary thereof, pursuant to the terms of the ONEOK, Inc. Equity Incentive Plan (the “Plan”). 1. Performance Unit Award. This Performance Unit Award Agreement and the Notice of Performance Unit Award and Agreement dated February 23, 2022, a copy of which is attached hereto and incorporated herein by reference, establishes the terms and conditions for the Company’s grant of an Award of «No_of_Perf_Units» Performance Units (the “Award”) to the Grantee pursuant to the Plan. This Agreement, when executed by the Grantee, constitutes an agreement between the Company and the Grantee. Capitalized terms not defined in this Agreement shall have the meaning ascribed to them in the Plan. 2. Performance Period; Vesting. The Performance Units granted pursuant to the Award will vest in accordance with the following terms and conditions: (a) Grantee’s rights with respect to the Performance Units shall be restricted during the period beginning February 23, 2022 (the “Grant Date”) and ending on February 23, 2025 (the “Performance Period”). (b) Except as otherwise provided in this Agreement or the Plan, the Grantee shall vest in a percentage of the number of Performance Units granted by this Award (including any Dividend Equivalents, as described below) at the end of the Performance Period, as provided for in Exhibit A and Exhibit B attached hereto, based upon the Company’s ranking for Total Stockholder Return against the ONEOK Peer Group listed in Exhibit C attached hereto, all as determined by the Committee in its sole discretion. Upon vesting, the Grantee shall become entitled to receive one (1) share of the Company’s common stock (“Common Stock”) for each such Performance Unit. No fractional shares shall be issued, and any amount attributable to a fractional share shall instead be withheld to satisfy any withholding tax obligation. (c) If the Grantee’s employment with the Company terminates prior to the end of the Performance Period other than by reason of Retirement, Disability, death or Change in Control, the Grantee shall forfeit all right, title and interest in the Performance Units and any Common Stock otherwise payable pursuant to this Agreement. For purposes of this Agreement, employment with any Subsidiary of the Company shall be treated as employment with the Company. Likewise, a termination of employment shall not be deemed to occur by reason of a transfer of employment between the Company and any Subsidiary. (d) If the Grantee’s employment with the Company is terminated during the Performance Period by reason of (i) Retirement, (ii) Disability or (iii) death, then the Grantee shall be partially vested in, and the Grantee shall be entitled to receive, a prorated amount of Performance Units. The amount is determined by multiplying the original Award times the percentage certified by the Committee at the end of the Performance Period, prorated for the Exhibit 10.18

{00138451 2 } 2 period of time that has elapsed under the Performance Period through the Grantee’s termination of employment. (e) Unless the Committee provides otherwise prior to a Change in Control, in the event of a Change in Control, (as defined below), the vesting or forfeiture of the Performance Units will be subject to the terms and conditions of Article 11 of the Plan; provided, however, the following shall be substituted for Plan Sections 11.1(b) and 11.2(b): the amount to be paid with respect to any outstanding Performance Units otherwise due and payable as a result of an event described in either Plan Section 11.1 or 11.2, shall be based on the greater of (x) the target number of Performance Units (100% Performance Multiplier) granted for the Performance Period, prorated for a Grantee whose employment terminates before the end of the Performance Period based upon the number of 30-day periods within the Performance Period completed as of the date of the Grantee’s termination of employment (or the effective date of the Change in Control for the events described in Section 11.2 of the Plan), divided by the total number of 30-day periods in the Performance Period, or (y) the percentage of Performance Units earned for the Performance Period based upon the actual performance level attained as of the date of the Change in Control, in each case after giving effect to the accumulation of Dividend Equivalents. (f) For purposes of the Award and this Agreement, “Retirement” shall mean a voluntary termination of employment if the Grantee has both completed five (5) years of service with the Company and attained age fifty (50). “Years of service” for this purpose excludes any service with any predecessor employer that was not considered within the controlled group (determined in accordance with Code section 414(c)) of the Company as of the date of the grant, unless explicitly required by the agreement executed in connection with such asset or stock acquisition, merger or other similar transaction and “voluntary termination” shall mean that the Grantee had an opportunity to continue employment with the Company, but did not do so. “Disability” shall have the meaning provided in the Plan. The term “Change in Control” shall have the meaning provided in the Plan unless the Award is or becomes subject to Code Section 409A, in which event the term “Change in Control” shall mean a “change in control event” as defined in Treasury Regulations Section 1.409A-3(i)(5). 3. Dividend Equivalents. During the Performance Period, before payment or forfeiture of the Award, the Award will be increased by a number of additional Performance Units (“Dividend Equivalents”) representing all cash dividends that would have been paid to the Grantee if one share of Common Stock had been issued to the Grantee on the Grant Date for each Performance Unit granted pursuant to this Agreement. The Dividend Equivalents credited during the Performance Period will include fractional shares; provided, however, the shares of Common Stock actually issued upon vesting of the Dividend Equivalents shall be paid only in whole shares of Common Stock, and any fractional shares of Common Stock in an amount of cash equal to the Fair Market Value of such fractional shares of Common Stock shall be withheld to satisfy any withholding tax obligation. Dividend Equivalents shall be subject to the same vesting provisions and other terms and conditions of this Agreement, and shall be paid on the same date, as the Performance Units to which they are attributable. Moreover, references in this Agreement to Performance Units shall be deemed to include any Performance Units attributable to Dividend Equivalents. 4. Non-Transferability of Performance Units.

{00138451 2 } 3 (a) The Performance Units may not be sold, assigned, transferred, pledged, encumbered or otherwise disposed of by Grantee or any other person until the end of the Performance Period. Any such attempt shall be wholly ineffective and will result in immediate forfeiture of all such amounts. (b) Notwithstanding the foregoing, the Grantee may transfer any part or all rights in the Performance Units to members of the Grantee’s immediate family, to one or more trusts for the benefit of such immediate family members or to partnerships in which such immediate family members are the only partners, in each case only if the Grantee does not receive any consideration for the transfer. In the event of any such transfer, the Performance Units shall remain subject to the terms and conditions of this Agreement. For any such transfer to be effective, the Grantee must provide prior written notice thereof to the Committee, unless otherwise authorized and approved by the Committee, in its sole discretion; and the Grantee shall furnish to the Committee such information as it may request with respect to the transferee and the terms and conditions of any such transfer. For purposes of this Agreement, “immediate family” shall mean the Grantee’s spouse, children and grandchildren. (c) The Grantee also may designate a Beneficiary, using the form attached hereto as Exhibit D or such other form as may be approved by the Committee, to receive any rights of the Grantee which may become vested in the event of the death of the Grantee under procedures and in the form established by the Committee. In the absence of such designation of a Beneficiary, any such rights shall be deemed to be transferred to the estate of the Grantee. 5. Distribution of Common Stock. Subject to any payment restrictions under Code Section 409A or other applicable law, the Common Stock or cash the Grantee becomes entitled to receive upon vesting of the Performance Units shall be distributed to the Grantee no later than 75 days after the first to occur of (i) the last day of the Performance Period, (ii) the date of the Grantee’s separation from service in the event of a payment subject to Plan Section 11.1, or (iii) the effective date of a Change in Control in the event of a payment subject to Plan Section 11.2. Payment upon or after a Change in Control shall be made in cash or shares of Common Stock, as determined by the Committee. 6. Administration of Award; Ratification of Actions. The Award shall be subject to such other rules as the Committee, in its sole discretion, may determine to be appropriate with respect to administration thereof. This Agreement shall be subject to discretionary interpretation and construction by the Committee. Day-to-day authority and responsibility for administration of the Plan, the Award and this Agreement have been delegated to the Company’s Benefit Plan Administration Committee and its authorized representatives, and all actions taken thereby shall be entitled to the same deference as if taken by the Committee itself. The Grantee shall take all actions and execute and deliver all documents as may from time to time be requested by the Committee. By receiving this Award or other benefit under the Plan, Grantee and each person claiming under or through Grantee shall conclusively be deemed to have indicated acceptance and ratification of, and consent to, any action taken under the Plan or the Award by the Company, the Board, the Committee or the Benefit Plan Administration Committee. 7. Tax Liability and Withholding. The Grantee agrees to pay to the Company any applicable federal, state or local income, employment, social security, Medicare or other

{00138451 2 } 4 withholding tax obligation arising in connection with the Award to the Grantee, which the Company shall determine; and the Company shall have the right, without the Grantee’s prior approval or direction, to satisfy such withholding tax by withholding all or any part of the shares of Common Stock or cash that would otherwise be distributed or paid to the Grantee, with any shares of Common Stock so withheld to be valued at the Fair Market Value on the date of such withholding. The Grantee, with the consent of the Company, may satisfy such withholding tax by transferring cash or Common Stock to the Company, with any shares of Common Stock so transferred to be valued at the Fair Market Value on the date of such transfer. Any payment of required withholding taxes in the form of Common Stock shall not exceed the maximum amount of tax that may be required to be withheld by law (or such other amount that would result in an accounting charge with respect to such shares used to pay such taxes). Income tax withholding shall occur on the date of actual distribution. Notwithstanding the foregoing, the ultimate liability for Grantee’s share of all tax withholding is the Grantee’s responsibility, and the Company makes no tax-related representations in connection with the grant or vesting of Performance Units or the distribution of Common Stock or cash to the Grantee. 8. Adjustment Provisions. If, prior to the expiration of the Performance Period, any change is made to the outstanding Common Stock or in the capitalization of the Company, the Performance Units granted pursuant to this Award shall be equitably adjusted or terminated to the extent and in the manner provided under the terms of the Plan. 9. Clawbacks, Insider Trading and Other Company Policies. The Grantee acknowledges and agrees that this Award is subject to all applicable clawback or recoupment, insider trading, share ownership and retention and other policies that the Company’s Board of Directors may adopt from time to time. Notwithstanding anything in the Plan or this Agreement to the contrary, all or a portion of the Award made to the Grantee under this Agreement is subject to being called for repayment to the Company or reduced in any situation where the Board of Directors or a Committee thereof determines that fraud, negligence, or intentional misconduct by the Grantee was a contributing factor to the Company having to restate all or a portion of its financial statement(s). Moreover, any Performance Units awarded under the Plan in this or any prior year to any Participant who is a current or former “executive officer” (as defined in Securities and Exchange Commission Rule 16a-1(f) under the Securities Exchange Act of 1934, as amended) is subject to any clawback policy adopted or amended by the Company from time to time (including, but not limited to, any clawback policy adopted to comply with Section 954 of the Dodd-Frank Act or guidance issued thereunder by any governmental agency or national securities exchange), regardless of whether such clawback policy is adopted or amended before or after the date on which such Performance Units are granted, determined or paid. A Participant’s acceptance of any Award under the Plan in any year shall constitute full and adequate consideration for the Company’s right to recover amounts paid to such Participant under the Plan in any prior year. The Committee may determine whether the Company shall effect any such repayment or reduction: (i) by seeking repayment from the Grantee, (ii) by reducing (subject to applicable law and the terms and conditions of the Plan or any other applicable plan, program, policy or arrangement) the amount that would otherwise be awarded or payable to the Grantee under the Award, the Plan or any other compensatory plan, program, or arrangement maintained by the Company, (iii) by withholding payment of future increases in compensation (including the payment of any discretionary bonus amount) or grants of compensatory awards that would otherwise have been made in accordance with the Company's otherwise applicable compensation

{00138451 2 } 5 practices, or (iv) by any combination of the foregoing. The determination regarding the Grantee’s conduct, and repayment or reduction under this provision shall be within the sole discretion of the Committee and shall be final and binding on the Grantee and the Company. The Grantee, in consideration of the grant of the Award, and by the Grantee’s execution of this Agreement, acknowledges the Grantee's understanding of this provision and hereby agrees to make and allow an immediate and complete repayment or reduction in accordance with this provision in the event of a call for repayment or other action by the Company or Committee to effect its terms with respect to the Grantee, the Award and/or any other compensation described in this Agreement. 10. Stock Reserved. The Company shall at all times during the term of the Award reserve and keep available such number of shares of its Common Stock as will be sufficient to satisfy the Award issued and granted to Grantee and the terms stated in this Agreement. It is intended by the Company that the Plan and shares of Common Stock covered by the Award are to be registered under the Securities Act of 1933, as amended, prior to the grant date; provided, that in the event such registration is for any reason not made effective for such shares, the Grantee agrees that all shares acquired pursuant to the grant will be acquired for investment and will not be available for sale or tender to any third party. 11. No Rights as Shareholder. The issuance and transfer of Common Stock shall be subject to compliance by the Company and the Grantee with all applicable laws, rules, regulations and approvals. No shares of Common Stock shall be issued or transferred unless and until any then-applicable legal requirements have been fully met or obtained to the satisfaction of the Company and its counsel. Except as otherwise provided in this Agreement, the Grantee shall have no rights as a shareholder of the Company in respect of the Performance Units or Common Stock for which the Award is granted. The Grantee shall not be considered a record owner of shares of Common Stock with respect to the Performance Units until the Performance Units are fully vested and Common Stock is actually distributed to the Grantee. 12. Continued Employment; Employment at Will. In consideration of the Company’s granting the Award as incentive compensation to Grantee pursuant to this Agreement, the Grantee agrees to all of the terms of this Agreement and to continue to perform services for the Company in a satisfactory manner as directed by the Company. Provided, however, no provision in this Agreement shall confer any right to the Grantee’s continued employment, limit the right of the Company to terminate the Grantee’s employment at any time or create any contractual right to receive any future awards under the Plan. Moreover, unless specifically provided under the terms thereof, the value of the Award will not be included as compensation or earnings when calculating the Grantee’s benefits under any employee benefit plan sponsored by the Company. 13. Code Section 409A. This Award and Agreement are intended to comply with Code Section 409A or an exemption therefrom and shall be construed and interpreted in a manner that is consistent with the requirements for avoiding additional taxes or penalties under Code Section 409A. Notwithstanding any other provision of the Agreement, any distributions or payments due hereunder that are subject to Code Section 409A may only be made upon an event and in a manner permitted by Code Section 409A. “Termination of employment,” separation from service or words of similar import used in this Agreement shall mean, with respect to any payments of deferred compensation subject to Code Section 409A, a “separation from service” as defined in Code Section 409A. Each payment of compensation under this Agreement,

{00138451 2 } 6 including installment payments, shall be treated as a separate payment of compensation for purposes of applying Code Section 409A. Except as otherwise permitted under Code Section 409A, Grantee may not, directly or indirectly, designate the calendar year of settlement, distribution or payment. To the extent that an Award is or becomes subject to Code Section 409A and Grantee is a Specified Employee (within the meaning of Code Section 409A) who becomes entitled to a distribution upon separation from service, no payment shall be made before the date which is six (6) months after the date of the Grantee's separation from service or, if earlier, the date of Grantee’s death (the “Delayed Payment Date”), if required by Code Section 409A. The accumulated amounts shall be distributed or paid in a lump sum payment on the Delayed Payment Date unless the Delayed Payment Date is the date of Grantee’s death, in which event the accumulated amounts shall be paid in a lump sum payment by December 31 following the year of Grantee’s death. Notwithstanding the foregoing, the Company makes no representations that the payments and benefits provided under this Agreement comply with Code Section 409A and shall not be liable for all or any taxes, penalties, interest or other expenses that may be incurred by the Grantee on account of non-compliance with Code Section 409A. 14. Entire Agreement; Severability; Conflicts. This Agreement contains the entire terms of the Award, and may not be changed other than by a written instrument executed by both parties or an amendment of the Plan, except where such change or modification does not adversely affect in a material way the terms of this Agreement, as provided in Section 15.4 of the Plan. This Agreement supersedes any prior agreements or understandings, and there are no other agreements or understandings relating to its subject matter. The invalidity or unenforceability of any provision of the Plan or this Agreement shall not affect any other provision of the Plan or this Agreement, and each provision of the Plan and this Agreement shall be severable and enforceable to the extent permitted by law. Should there be any inconsistency between the provisions of this Agreement and the terms of the Award as stated in the resolutions and records of the Board of Directors or the Plan, the provisions of such resolutions and records of the Board of Directors and the Plan shall control. 15. Successors and Assigns. The Award evidenced by this Agreement shall inure to the benefit of and be binding upon the heirs, legatees, legal representatives, successors, and assigns of the parties hereto. 16. Governing Law; Mandatory Claims Procedures. This Agreement shall be construed in accordance with, and subject to, the laws of the State of Oklahoma applicable to contracts made and to be entirely performed in Oklahoma and wholly disregarding any choice of law provisions or conflict of law principles that might otherwise be contrary to this express intent. If Grantee or any person acting on Grantee’s behalf (the “Claimant”) has any claim or dispute related in any way to the Award or to the Plan, the Claimant must follow the claims and arbitration procedures set forth in Article 13 of the Plan. All claims must be brought no later than one year following the date on which the facts forming the basis of the claim are known or should have been known by the claimant, whichever is earlier. Any claim that is not submitted within the applicable time limit shall be waived. The Grantee hereby acknowledges receipt of this Agreement, the Notice of Performance Unit Award and Agreement and a copy of the Plan, and accepts the Award under the terms and conditions stated in this Agreement, subject to all terms and provisions of the Plan, by signing

{00138451 2 } 7 this Agreement as of the date indicated. In the absence of a signed acceptance, the Grantee will be deemed to have accepted this Award on the Grant Date, and all its associated terms and conditions, including the mandatory claims and arbitration procedures, unless the Grantee notifies the Company of the Grantee’s non-acceptance of the Award by contacting the stock plan administrator, in writing within sixty (60) days of the Grant Date. Date «Officer_Name» Grantee

{00138451 2 } 8 Exhibit A Performance Unit Criteria 2022-2025 Performance Period ONEOK Total Stockholder Return (TSR) Ranking vs. ONEOK Peer Group Percentage of Performance Units Earned (Performance Multiplier) 90th percentile and above 75th percentile 50th percentile 25th percentile Below 25th percentile 200% 150% 100% 50% 0% If ONEOK’s TSR ranking within the ONEOK Peer Group at the end of the Performance Period is between any two of the stated percentile levels in the above table, the percentage of the Performance Units earned (the performance multiplier) will be interpolated between the earning levels. No Performance Units are earned based on performance if ONEOK’s TSR ranking at the end of the Performance Period is below the 25th percentile within its Peer Group.

{00138451 2 } 9 Exhibit B Illustration of Hypothetical 2022-2025 Performance Period Performance Unit Award Calculation The illustrations below assume that 500 Performance Units are awarded to Grantee in February 2022. ONEOK Total Stockholder Return (TSR) Ranking vs. ONEOK Peer Group Hypothetical 1: If ONEOK’s TSR Ranking for 2022-2025 is at the 40th percentile within the ONEOK Peer Group, then the performance multiplier would be 80 percent, as interpolated between a 50 percent multiplier (25th percentile within Peer Group) and a 100 percent multiplier (50th percentile within Peer Group) from Exhibit A. Hypothetical 2: If ONEOK’s TSR Ranking for 2022-2025 is at the 60th percentile within the ONEOK Peer Group, then the performance multiplier would be 120 percent, as interpolated between a 100 percent multiplier (50th percentile within Peer Group) and a 150 percent multiplier (75th percentile within Peer Group) from Exhibit A. Percentage of Performance Units Earned Hypothetical 1: 80% x 500 PUs = 400 shares of Common Stock payable to Grantee in 2025. Hypothetical 2: 120% x 500 PUs = 600 shares of Common Stock payable to Grantee in 2025.

{00138451 2 } 10 Exhibit C 2022-2025 ONEOK TSR Peer Group* Company Name Sym DCP Midstream LP DCP Energy Transfer LP ET EnLink Midstream, LLC ENLC Enterprise Products Partners EPD Kinder Morgan Inc. KMI Magellan Midstream Partners MMP MPLX LP MPLX NuStar Energy LP NS Plains All American Pipeline LP PAA Targa Resources Corp TRGP Williams Companies Inc. WMB Western Midstream Partners, LP WES * In the event that any member of the 2022-2025 ONEOK Peer Group liquidates or reorganizes under the United States Bankruptcy Code (U.S.C. Title 11) such entity shall remain in the 2022-2025 ONEOK Peer Group but shall be deemed to have a TSR of -100% for purposes of calculating the Performance Multiplier. If any member of the 2022-2025 ONEOK Peer Group is acquired by an unrelated entity before the end of the Performance Period, such member shall be removed from the 2022-2025 ONEOK Peer Group for purposes of calculating the Performance Multiplier. In all other cases involving merger, reorganization or other material change in ownership, legal structure or business operations of any member of the 2022-2025 ONEOK Peer Group including acquisition by a related entity before the end of the Performance Period, the Committee shall have discretionary authority to retain, remove or replace such member for purposes of calculating the Performance Multiplier.

{00138451 2 } 11 Exhibit D Beneficiary Designation Form I, _________________________________ (“Plan Participant”), state that I am a participant in the ONEOK, Inc. Equity Incentive Plan, the ONEOK, Inc. Equity Compensation Plan, or any other stock compensation plan sponsored by ONEOK, Inc. (individually and collectively, the “Plan”), and the holder of one or more Awards granted to me under the Plan. With the understanding that I may change the following beneficiary designations at any time by furnishing written notice thereof to the Committee (provided that such change does not affect the time and form of payment of any amounts subject to an existing deferral election), I hereby designate the following individuals (or entities) as my beneficiaries to receive any and all benefits payable to me under the Plan and to exercise all rights, benefits and features of the Awards described below, in accordance with the terms of the Plan and any associated award agreement, in the event of my death as follows: 1. Primary Beneficiary (Beneficiaries) The Primary Beneficiaries named below shall have first priority to any and all Awards described below and to exercise all rights, benefits and features of the Awards described below, in accordance with the terms of the Plan and any associated award agreement, in the event of my death. Name Relationship SSN Percentage of Total If a designated Primary Beneficiary named dies or ceases to exist prior to receiving the share designated for such Primary Beneficiary, such share shall be transferred proportionately to other surviving and existing designated Primary Beneficiaries. 2. Contingent Beneficiary (or Beneficiaries) The Contingent Beneficiaries named below, if any, shall receive all Awards described below and to exercise, enjoy and receive all rights, benefits and features of the Awards described below (including Awards that I have elected to defer under the Plan or the ONEOK, Inc. 2005 Nonqualified Deferred Compensation Plan, if applicable) in accordance with the Plan and the terms and provisions of such Awards in the event of my death if no Primary Beneficiary named above survives me or exists. Name Relationship SSN Percentage of Total

{00138451 2 } 12 3. Awards Covered By Beneficiary Designation This Beneficiary Designation is applicable to and covers the following Awards: (Check one) _______ All Awards previously granted to me under the Plan and all Awards to be granted to me under the Plan in the future; or _______ The following Awards that have been granted to me under the Plan: (List Awards Covered) Award Grant Date Number of Shares of Stock 4. General Terms This instrument does not modify, extend or increase any rights or benefits otherwise provided for by any Award under the Plan. All terms used in this instrument shall have the meaning provided for under the Plan, unless otherwise indicated herein. This instrument is not applicable to Common Stock of ONEOK, Inc. that I have acquired outright and without any restrictions or limitations under the Plan prior to my death. This instrument revokes and supersedes any prior designation of a Beneficiary (or Beneficiaries) made by me with respect to the Awards covered by this Beneficiary Designation as set forth in Paragraph 3. IN WITNESS WHEREOF, I have signed this instrument this day of ____________, __________. Plan Participant __________________________________ Witness __________________________________ Witness RECEIVED AND ACKNOWLEDGED this ____ day of ________, 20__, ______________________________________ For the Committee

EX-21

Exhibit 21

ONEOK, Inc.

SUBSIDIARIES OF THE COMPANY

AS OF DECEMBER 31, 2021

Subsidiaries	State of Incorporation or Organization
Bighorn Gas Gathering, L.L.C. (49.0%)	Delaware
Black Mesa Holdings, Inc.	Delaware
Black Mesa Pipeline, Inc.	Delaware
Black Mesa Pipeline Operations, L.L.C.	Delaware
Black Mesa Technologies, Inc.	Oklahoma
Border Midwestern Company	Delaware
Chisholm Pipeline Company (50%)	Delaware
Chisholm Pipeline Holdings, L.L.C.	Delaware
Crestone Energy Ventures, L.L.C.	Delaware
Crestone Gathering Services, L.L.C.	Delaware
Crestone Powder River, L.L.C.	Delaware
Crestone Wind River, L.L.C.	Delaware
Fort Union Gas Gathering, L.L.C. (50%)	Delaware
Guardian Pipeline, L.L.C.	Delaware
Heartland Pipeline Company (general partnership) (50%)	Texas
Lost Creek Gathering Company, L.L.C. (35%)	Delaware
Mid Continent Market Center, L.L.C.	Kansas
Midwestern Gas Transmission Company	Delaware
Mont Belvieu I Fractionation Facility (joint venture) (80%)	Texas
Northern Border Pipeline Company (general partnership) (50%)	Texas
OkTex Pipeline Company, L.L.C.	Delaware
ONEOK Arbuckle II Pipeline, L.L.C.	Oklahoma
ONEOK Arbuckle North Pipeline, L.L.C.	Delaware
ONEOK Arbuckle Pipeline, L.L.C.	Delaware
ONEOK Bakken Pipeline, L.L.C.	Delaware
ONEOK Bushton Processing, L.L.C.	Delaware
ONEOK Elk Creek Pipeline, L.L.C.	Oklahoma
ONEOK Energy Services Company, II	Delaware
ONEOK Energy Services Company, L.P.	Texas
ONEOK Energy Services Holdings, L.L.C.	Oklahoma
ONEOK Field Services Company, L.L.C.	Oklahoma
ONEOK Gas Storage Holdings, L.L.C.	Delaware
ONEOK Gas Storage, L.L.C.	Oklahoma
ONEOK Gas Transportation, L.L.C.	Oklahoma
ONEOK Hydrocarbon GP, L.L.C.	Delaware
ONEOK Hydrocarbon Holdings, L.L.C.	Delaware
ONEOK Hydrocarbon Southwest, L.L.C.	Delaware
ONEOK Hydrocarbon, L.L.C.	Delaware
ONEOK Hydrocarbon, L.P.	Delaware
ONEOK ILP GP, L.L.C.	Delaware
ONEOK Leasing Company	Delaware

1

ONEOK MB I, L.P.	Delaware
ONEOK Midstream Gas Supply, L.L.C.	Oklahoma
ONEOK Mont Belvieu Properties, L.L.C.	Delaware
ONEOK Mont Belvieu Storage Company, L.L.C.	Delaware
ONEOK NGL Gathering, L.L.C.	Delaware
ONEOK NGL Pipeline, L.L.C.	Delaware
ONEOK North System, L.L.C.	Delaware
ONEOK Northern Border Pipeline Company Holdings, L.L.C.	Oklahoma
ONEOK Overland Pass Holdings, L.L.C.	Oklahoma
ONEOK Parking Company, L.L.C.	Delaware
ONEOK Partners GP, L.L.C.	Delaware
ONEOK Partners Intermediate Limited Partnership	Delaware
ONEOK Partners, L.P.	Delaware
ONEOK Permian NGL Operating Company, L.L.C.	Delaware
ONEOK Pipeline Holdings, L.L.C.	Delaware
ONEOK Rockies Investments, L.L.C.	Delaware
ONEOK Rockies Midstream, L.L.C.	Delaware
ONEOK Services Company, L.L.C.	Oklahoma
ONEOK Southeast Texas NGL Pipeline, L.L.C.	Oklahoma
ONEOK Sterling III Pipeline, L.L.C.	Oklahoma
ONEOK Texas Gas Storage, L.L.C.	Texas
ONEOK Underground Storage Company, L.L.C.	Kansas
ONEOK Unit Holdings, Inc.	Delaware
ONEOK VESCO Holdings, L.L.C.	Delaware
ONEOK West Texas NGL Pipeline, L.L.C.	Texas
ONEOK Western Trail Pipeline, L.L.C.	Oklahoma
ONEOK WesTex Transmission, L.L.C.	Delaware
Overland Pass Pipeline Company LLC (50%)	Delaware
Roadrunner Gas Transmission Holdings, LLC (50%)	Delaware
Roadrunner Gas Transmission, LLC (100% owned by Roadrunner Gas Transmission Holdings, LLC)	Delaware
Venice Energy Services Company, L.L.C. (10.1765%)	Delaware
Viking Gas Transmission Company	Delaware

2

EX-22

Exhibit 22

List of Subsidiary Guarantors and Issuers

of Guaranteed Securities

As of December 31, 2021, the following entities guarantee the notes issued by ONEOK, Inc. (the “ONEOK Notes”) and ONEOK Partners, L.P. (the “ONEOK Partners Notes”).

Entity	Jurisdiction of Incorporation or Organization	ONEOK Notes	ONEOK Partners Notes
ONEOK, Inc.	Oklahoma	Issuer	Guarantor
ONEOK Partners, L.P.	Delaware	Guarantor	Issuer
ONEOK Partners Intermediate Limited Partnership	Delaware	Guarantor	Guarantor

As of December 31, 2021, the ONEOK Notes consisted of the following securities:

Issued under the Indenture dated as of September 24, 1998

6-7/8% Debentures due 2028

Issued under the Indenture dated as of December 28, 2001

6.00% Notes due 2035

Issued under the Indenture dated as of January 26, 2012

7.50% Notes due 2023

2.75% Notes due 2024

2.200% Notes due 2025

5.850% Notes due 2026

4.000% Notes due 2027

4.55% Notes due 2028

4.35% Notes due 2029

3.40% Notes due 2029

3.100% Notes due 2030

6.350% Notes due 2031

4.950% Notes due 2047

5.20% Notes due 2048

4.45% Notes due 2049

4.500% Notes due 2050

7.150% Notes due 2051

As of December 31, 2021, the ONEOK Partners Notes consisted of the following securities:

Issued under the Indenture dated as of September 25, 2006

3.375% Senior Notes due 2022

5.000% Senior Notes due 2023

4.90% Senior Notes due 2025

6.65% Senior Notes due 2036

6.85% Senior Notes due 2037

6.125% Senior Notes due 2041

6.200% Senior Notes due 2043

EX-23

Exhibit 23

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We hereby consent to the incorporation by reference in the Registration Statements on Form S-3 (Nos. 333-239363 and 333-239348) and Form S-8 (Nos. 333-185633, 333-182991, 333-75768, 333-140629, 333-152748, 333-157548, 333-165044, 333-171308, 333-178622, 333-194284, 333-226393, 333-228499 and 333-237869) of ONEOK, Inc. of our reportdated March 1, 2022 relating to the financial statements and the effectiveness of internal control over financial reporting, which appears in this Form 10-K.

/s/ PricewaterhouseCoopers LLP

Tulsa, Oklahoma

March 1, 2022

EX-31.1

Exhibit 31.1

Certification

I, Pierce H. Norton II, certify that:

I have reviewed this annual report on Form 10-K of ONEOK, Inc.;

Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a)Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b)Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c)Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d)Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a)All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b)Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: March 1, 2022

/s/ Pierce H. Norton II

Pierce H. Norton II

Chief Executive Officer

EX-31.2

Exhibit 31.2

Certification

I, Walter S. Hulse III, certify that:

I have reviewed this annual report on Form 10-K of ONEOK, Inc.;

Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a)Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b)Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c)Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d)Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a)All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b)Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: March 1, 2022

/s/ Walter S. Hulse III

Walter S. Hulse III

Chief Financial Officer

EX-32.1

Exhibit 32.1

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Annual Report on Form 10-K of ONEOK, Inc. (the “Registrant”) for the period ending December 31, 2021, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Pierce H. Norton II, Chief Executive Officer of the Registrant, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

(1)the Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2)the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Registrant.

/s/ Pierce H. Norton II

Pierce H. Norton II

Chief Executive Officer

March 1, 2022

A signed original of this written statement required by Section 906, or other document authenticating, acknowledging or otherwise adopting the signature that appears in typed form within the electronic version of this written statement required by Section 906, has been provided to ONEOK, Inc. and will be retained by ONEOK, Inc. and furnished to the Securities and Exchange Commission or its staff upon request.

EX-32.2

Exhibit 32.2

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Annual Report on Form 10-K of ONEOK, Inc. (the “Registrant”) for the period ending December 31, 2021, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Walter S. Hulse III, Chief Financial Officer of the Registrant, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

(1)the Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2)the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Registrant.

/s/ Walter S. Hulse III

Walter S. Hulse III

Chief Financial Officer

March 1, 2022

A signed original of this written statement required by Section 906, or other document authenticating, acknowledging or otherwise adopting the signature that appears in typed form within the electronic version of this written statement required by Section 906, has been provided to ONEOK, Inc. and will be retained by ONEOK, Inc. and furnished to the Securities and Exchange Commission or its staff upon request.

XML

Cover - USD ($) $ in Billions	12 Months Ended
	Dec. 31, 2021	Feb. 22, 2022	Jun. 30, 2021
Cover [Abstract]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2021
Document Transition Report	false
Entity File Number	001-13643
Entity Registrant Name	ONEOK, Inc.
Entity Incorporation, State or Country Code	OK
Entity Tax Identification Number	73-1520922
Entity Address, Address Line One	100 West Fifth Street,
Entity Address, City or Town	Tulsa,
Entity Address, State or Province	OK
Entity Address, Postal Zip Code	74103
City Area Code	918
Local Phone Number	588-7000
Title of 12(b) Security	Common stock, par value of $0.01
Trading Symbol	OKE
Security Exchange Name	NYSE
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Entity Shell Company	false
Entity Public Float			$ 24.4
Entity Common Stock, Shares Outstanding		446,213,285
Documents Incorporated by Reference	Portions of the definitive proxy statement to be delivered to shareholders in connection with the Annual Meeting of Shareholders to be held May 25, 2022, are incorporated by reference in Part III.
Entity Central Index Key	0001039684
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	FY
Amendment Flag	false

XML

Audit Information	12 Months Ended
	Dec. 31, 2021
Audit Information [Abstract]
Auditor Name	PricewaterhouseCoopers LLP
Auditor Firm ID	238
Auditor Location	Tulsa, Oklahoma

XML

CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Revenues
Revenues	$ 16,540,309	$ 8,542,242	$ 10,164,367
Cost of sales and fuel (exclusive of items shown separately below)	12,256,655	5,110,146	6,788,040
Operations and maintenance	900,420	761,176	863,708
Depreciation and amortization	621,701	578,662	476,535
Impairment charges (Note D and E)	0	607,200	0
General taxes	166,668	125,028	119,156
(Gain) loss on sale of assets	(1,394)	(1,327)	2,575
Operating income	2,596,259	1,361,357	1,914,353
Equity in net earnings from investments (Note M)	122,520	143,241	154,541
Impairment of equity investments (Note M)	0	(37,730)	0
Allowance for equity funds used during construction	1,682	23,662	64,815
Other income (expense)	(3,333)	24,672	9,055
Interest expense (net of capitalized interest of $25,150, $75,436 and $107,275, respectively)	(732,924)	(712,886)	(491,773)
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest, Total	1,984,204	802,316	1,650,991
Income taxes (Note L)	(484,498)	(189,507)	(372,414)
Net income	1,499,706	612,809	1,278,577
Less: Preferred stock dividends	1,100	1,100	1,100
Net income available to common shareholders	$ 1,498,606	$ 611,709	$ 1,277,477
Basic earnings per common share (Note I)	$ 3.36	$ 1.42	$ 3.09
Diluted earnings per common share (Note I)	$ 3.35	$ 1.42	$ 3.07
Average shares (thousands)
Basic	446,403	431,105	413,560
Diluted	447,403	431,782	415,444
Commodity Sales
Revenues
Revenues	$ 15,180,264	$ 7,255,259	$ 8,916,047
Services
Revenues
Revenues	$ 1,360,045	$ 1,286,983	$ 1,248,320

XML

CONSOLIDATED STATEMENTS OF INCOME CONSOLIDATED STATEMENT OF INCOME (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Statement [Abstract]
Interest expense (net of capitalized interest)	$ 25,150	$ 75,436	$ 107,275

XML

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Net income	$ 1,499,706	$ 612,809	$ 1,278,577
Other comprehensive income (loss), net of tax
Change in fair value of derivatives, net of tax of $60,896, $49,292 and $44,149, respectively	(203,868)	(165,023)	(147,803)
Derivative amounts reclassified to net income, net of tax of $(69,134), $(6,313) and $6,058, respectively	228,999	21,097	(21,057)
Change in retirement and other postretirement benefit plan obligations, net of tax of $(14,929), $7,812 and $2,910, respectively	49,976	(26,154)	(9,696)
Other comprehensive income (loss) of unconsolidated affiliates, net of tax of $(1,490), $2,201 and $2,152, respectively	4,991	(7,369)	(7,205)
Total other comprehensive income (loss), net of tax	80,098	(177,449)	(185,761)
Comprehensive Income (Loss), Net of Tax, Attributable to Parent, Total	$ 1,579,804	$ 435,360	$ 1,092,816

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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Change in fair value of derivatives, tax	$ 60,896	$ 49,292	$ 44,149
Derivative amounts reclassified to net income, tax	(69,134)	(6,313)	6,058
Change in retirement and other postretirement benefit plan obligations, tax	(14,929)	7,812	2,910
Other comprehensive income (loss) of unconsolidated affiliates, tax	$ (1,490)	$ 2,201	$ 2,152

XML

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Current assets
Cash and cash equivalents	$ 146,391	$ 524,496
Accounts receivable, net	1,441,786	829,796
Materials and supplies	153,019	143,178
NGLs and natural gas in storage	427,880	227,810
Commodity imbalances	39,609	11,959
Other current assets	165,689	132,536
Total current assets	2,374,374	1,869,775
Property, plant and equipment
Property, plant and equipment	23,820,539	23,072,935
Accumulated depreciation and amortization	4,500,665	3,918,007
Net property, plant and equipment (Note D)	19,319,874	19,154,928
Investments and other assets
Investments in unconsolidated affiliates (Note M)	797,613	805,032
Goodwill and net intangible assets (Note E)	763,295	773,723
Other assets	366,457	475,296
Total investments and other assets	1,927,365	2,054,051
Total assets	23,621,613	23,078,754
Current liabilities
Current maturities of long-term debt (Note F)	895,814	7,650
Accounts payable	1,332,391	719,302
Commodity imbalances	309,054	186,372
Accrued taxes	97,537	89,428
Accrued interest	235,602	245,153
Operating lease liability, current (Note O)	13,783	13,610
Other current liabilities	300,438	83,032
Total current liabilities	3,184,619	1,344,547
Long-term debt, excluding current maturities (Note F)	12,747,636	14,228,421
Deferred credits and other liabilities
Deferred income taxes (Note L)	1,166,690	669,697
Operating lease liability, noncurrent (Note O)	75,636	87,610
Other deferred credits	431,869	706,081
Total deferred credits and other liabilities	1,674,195	1,463,388
Commitments and contingencies (Note N)
Equity (Note G)
Preferred stock, $0.01 par value: authorized and issued 20,000 shares at December 31, 2021, and at December 31, 2020	0	0
Common stock, $0.01 par value: authorized 1,200,000,000 shares; issued 474,916,234 shares and outstanding 446,138,177 shares at December 31, 2021; issued 474,916,234 shares and outstanding 444,872,383 shares at December 31, 2020	4,749	4,749
Paid-in capital	7,213,861	7,353,396
Accumulated Other Comprehensive Income (Loss), Net of Tax	(471,351)	(551,449)
Retained earnings	0	0
Treasury stock, at cost: 28,778,057 shares at December 31, 2021, and 30,043,851 shares at December 31, 2020	(732,096)	(764,298)
Total equity	6,015,163	6,042,398
Total liabilities and equity	$ 23,621,613	$ 23,078,754

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CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Dec. 31, 2021	Dec. 31, 2020
Equity (Note G)
Preferred stock, shares, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares, authorized (in shares)	20,000	20,000
Preferred stock, shares, issued (in shares)	20,000	20,000
Common stock, shares, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares, authorized (in shares)	1,200,000,000	1,200,000,000
Common stock, shares, issued (in shares)	474,916,234	474,916,234
Common stock, shares, outstanding (in shares)	446,138,177	444,872,383
Treasury stock, shares (in shares)	28,778,057	30,043,851

XML

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Operating activities
Net income	$ 1,499,706	$ 612,809	$ 1,278,577
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	621,701	578,662	476,535
Impairment charges	0	644,930	0
Equity in net earnings from investments	(122,520)	(143,241)	(154,541)
Distributions received from unconsolidated affiliates	123,010	144,352	163,476
Deferred income tax expense	472,057	186,730	372,729
Other, net	94,091	35,327	(26,101)
Changes in assets and liabilities:
Accounts receivable	(610,531)	(1,297)	(19,688)
NGLs and natural gas in storage, net of commodity imbalances	(105,038)	172,316	(10,193)
Accounts payable	622,425	(80,257)	(62,946)
Risk-management assets and liabilities	(93,713)	(187,458)	(86,268)
Other assets and liabilities, net	45,084	(63,805)	15,199
Cash provided by operating activities	2,546,272	1,899,068	1,946,779
Investing activities
Capital expenditures (less allowance for equity funds used during construction)	(696,854)	(2,195,381)	(3,848,349)
Distributions received from unconsolidated affiliates in excess of cumulative earnings	19,363	31,808	94,168
Other, net	12,199	(106,956)	(14,577)
Cash used in investing activities	(665,292)	(2,270,529)	(3,768,758)
Financing activities
Dividends paid	(1,667,431)	(1,605,366)	(1,457,628)
Borrowing (repayment) of short-term borrowings, net	0	(220,000)	220,000
Issuance of long-term debt, net of discounts	0	3,244,777	4,185,435
Repayment of long-term debt	(604,894)	(1,457,222)	(1,057,348)
Issuance of common stock	32,791	969,759	29,040
Other	(19,551)	(56,949)	(88,537)
Cash provided by (used in) financing activities	(2,259,085)	874,999	1,830,962
Change in cash and cash equivalents	(378,105)	503,538	8,983
Cash and cash equivalents at beginning of period	524,496	20,958	11,975
Cash and cash equivalents at end of period	146,391	524,496	20,958
Supplemental cash flow information:
Cash paid for interest, net of amounts capitalized	691,897	760,984	435,165
Cash paid for income taxes, net of refunds	$ 8,864	$ 342	$ 2,690

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CONSOLIDATED STATEMENT OF CHANGES IN EQUITY - USD ($) $ in Thousands	Total	Preferred Stock	Common Stock	Paid-in Capital	Accumulated Other Comprehensive Loss	Retained Earnings	Treasury Stock	Cumulative Effect adjustment for adoption of ASU 2016-02, "Leases (Topic 842)"	Cumulative Effect adjustment for adoption of ASU 2016-02, "Leases (Topic 842)" Preferred Stock	Cumulative Effect adjustment for adoption of ASU 2016-02, "Leases (Topic 842)" Common Stock	Cumulative Effect adjustment for adoption of ASU 2016-02, "Leases (Topic 842)" Paid-in Capital	Cumulative Effect adjustment for adoption of ASU 2016-02, "Leases (Topic 842)" Accumulated Other Comprehensive Loss	Cumulative Effect adjustment for adoption of ASU 2016-02, "Leases (Topic 842)" Retained Earnings	Cumulative Effect adjustment for adoption of ASU 2016-02, "Leases (Topic 842)" Treasury Stock
Shares, issued, beginning balance at Dec. 31, 2018		20,000	445,016,234
Total equity, beginning balance at Dec. 31, 2018	$ 6,579,543	$ 0	$ 4,450	$ 7,615,138	$ (188,239)	$ 0	$ (851,806)	$ (67)	$ 0	$ 0	$ 0	$ 0	$ (67)	$ 0
Net income	1,278,577	0	0	0	0	1,278,577	0
Other comprehensive income (loss)	$ (185,761)	0	0	0	(185,761)	0	0
Preferred stock dividends paid (in dollars per share)	$ 55.00
Preferred stock dividends	$ (1,100)	0	$ 0	0	0	(1,100)	0
Common Stock Issued During Period, Shares, Other			0
Common Stock Issued During Period, Value, Other	$ 35,745	0	$ 0	(7,667)	0	0	43,412
Common stock dividends paid (in dollars per share)	$ 3.53
Common Stock Dividends	$ (1,457,831)	0	0	(180,421)	0	(1,277,410)	0
Other, net	(23,155)	$ 0	$ 0	(23,155)	0	0	0
Shares, issued, ending balance at Dec. 31, 2019		20,000	445,016,234
Total equity, ending balance at Dec. 31, 2019	6,225,951	$ 0	$ 4,450	7,403,895	(374,000)	0	(808,394)
Net income	612,809	0	0	0	0	612,809	0
Other comprehensive income (loss)	$ (177,449)	0	0	0	(177,449)	0	0
Preferred stock dividends paid (in dollars per share)	$ 55.00
Preferred stock dividends	$ (1,100)	0	$ 0	(550)	0	(550)	0
Common Stock Issued During Period, Shares, Other			29,900,000
Common Stock Issued During Period, Value, Other	$ 978,868	0	$ 299	934,473	0	0	44,096
Common stock dividends paid (in dollars per share)	$ 3.74
Common Stock Dividends	$ (1,605,000)	0	0	(992,741)	0	(612,259)	0
Other, net	8,319	$ 0	$ 0	8,319	0	0	0
Shares, issued, ending balance at Dec. 31, 2020		20,000	474,916,234
Total equity, ending balance at Dec. 31, 2020	6,042,398	$ 0	$ 4,749	7,353,396	(551,449)	0	(764,298)
Net income	1,499,706	0	0	0	0	1,499,706	0
Other comprehensive income (loss)	$ 80,098	0	0	0	80,098	0	0
Preferred stock dividends paid (in dollars per share)	$ 55.00
Preferred stock dividends	$ (1,100)	0	$ 0	0	0	(1,100)	0
Common Stock Issued During Period, Shares, Other			0
Common Stock Issued During Period, Value, Other	$ 38,882	0	$ 0	6,680	0	0	32,202
Common stock dividends paid (in dollars per share)	$ 3.74
Common Stock Dividends	$ (1,666,751)	0	0	(168,145)	0	(1,498,606)	0
Other, net	21,930	$ 0	$ 0	21,930	0	0	0
Shares, issued, ending balance at Dec. 31, 2021		20,000	474,916,234
Total equity, ending balance at Dec. 31, 2021	$ 6,015,163	$ 0	$ 4,749	$ 7,213,861	$ (471,351)	$ 0	$ (732,096)

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CONSOLIDATED STATEMENT OF CHANGES IN EQUITY CONSOLIDATED STATEMENT OF CHANGES IN EQUITY (Parenthetical) - $ / shares	3 Months Ended												12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Statement of Stockholders' Equity [Abstract]
Preferred stock dividends paid (in dollars per share)													$ 55.00	$ 55.00	$ 55.00
Common stock dividends paid (in dollars per share)	$ 0.935	$ 0.935	$ 0.935	$ 0.935	$ 0.935	$ 0.935	$ 0.935	$ 0.935	$ 0.915	$ 0.890	$ 0.865	$ 0.860	$ 3.74	$ 3.74	$ 3.53

XML

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Notes)

12 Months Ended

Dec. 31, 2021

Accounting Policies [Abstract]

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Organization and Nature of Operations - We are a corporation incorporated under the laws of the state of Oklahoma.

Our Natural Gas Gathering and Processing segment provides midstream services to producers in North Dakota, Montana, Wyoming, Kansas and Oklahoma. Raw natural gas is typically gathered at the wellhead, compressed and transported through pipelines to our processing facilities. Processed natural gas, usually referred to as residue natural gas, is then recompressed and delivered to natural gas pipelines, storage facilities and end users. The NGLs separated from the raw natural gas are sold and delivered through NGL pipelines to fractionation facilities for further processing.

Our Natural Gas Liquids segment owns and operates facilities that gather, fractionate, treat and distribute NGLs and store NGL products, primarily in Oklahoma, Kansas, Texas, New Mexico and the Rocky Mountain region, which includes the Williston, Powder River and DJ Basins. We provide midstream services to producers of NGLs and deliver those products to the two primary market centers, one in the Mid-Continent in Conway, Kansas, and the other in the Gulf Coast in Mont Belvieu, Texas. We own or have an ownership interest in FERC-regulated NGL gathering and distribution pipelines in Oklahoma, Kansas, Texas, New Mexico, Montana, North Dakota, Wyoming and Colorado, and terminal and storage facilities in Kansas, Missouri, Nebraska, Iowa and Illinois. We have a 50% ownership interest in Overland Pass Pipeline Company, which operates an interstate NGL pipeline originating in Wyoming and Colorado and terminating in Kansas. The majority of the pipeline-connected natural gas processing plants in the Williston Basin, Oklahoma, Kansas and the Texas Panhandle are connected to our NGL gathering systems. We lease rail cars and own and operate truck- and rail-loading and -unloading facilities connected to our NGL fractionation, storage and pipeline assets. We also own FERC-regulated NGL distribution pipelines in Kansas, Missouri, Nebraska, Iowa, Illinois and Indiana that connect our Mid-Continent assets with Midwest markets, including Chicago, Illinois. A portion of our ONEOK North System transports refined products, including unleaded gasoline and diesel, from Kansas to Iowa.

Our Natural Gas Pipelines segment, through its wholly owned assets, provides intrastate and interstate natural gas transportation and storage services to end users. We have 50% ownership interests in Northern Border Pipeline and Roadrunner, which provide transportation services to various end users. Our interstate pipelines are regulated by the FERC and are located in North Dakota, Minnesota, Wisconsin, Illinois, Indiana, Kentucky, Tennessee, Oklahoma, Texas and New Mexico. Our intrastate natural gas pipeline and storage assets are located in Oklahoma, Kansas and Texas. Our assets connect major natural gas producing basins and market hubs with end-use customers.

Consolidation - Our Consolidated Financial Statements include our accounts and the accounts of our subsidiaries over which we have control or are the primary beneficiary. All intercompany balances and transactions have been eliminated in consolidation.

Investments in unconsolidated affiliates are accounted for using the equity method if we have the ability to exercise significant influence over operating and financial policies of our investee. Under this method, an investment is carried at its acquisition cost and adjusted each period for contributions made, distributions received and our share of the investee’s comprehensive income. For the investments we account for under the equity method, the premium or excess cost over underlying fair value of net assets is referred to as equity-method goodwill. Impairment of equity investments is recorded when the impairments are other than temporary. These amounts are recorded as investments in unconsolidated affiliates on our accompanying Consolidated Balance Sheets. See Note M for disclosures of our unconsolidated affiliates.

Distributions paid to us from our unconsolidated affiliates are classified as operating activities on our Consolidated Statements of Cash Flows until the cumulative distributions exceed our proportionate share of income from the unconsolidated affiliate since the date of our initial investment. The amount of cumulative distributions paid to us that exceeds our cumulative proportionate share of income in each period represents a return of investment and is classified as an investing activity on our Consolidated Statements of Cash Flows.

Use of Estimates - The preparation of our Consolidated Financial Statements and related disclosures in accordance with GAAP requires us to make estimates and assumptions with respect to values or conditions that cannot be known with certainty that affect the reported amounts on our Consolidated Financial Statements. Items that may be estimated include, but are not limited to, the economic useful life of assets, fair value of assets, liabilities and equity-method investments, obligations under employee benefit plans, provisions for uncollectible accounts receivable, expenses for services received but for which no invoice has been received, provision for income taxes, including any deferred tax valuation allowances, the results of litigation and various other

recorded or disclosed amounts. In addition, a portion of our revenues and cost of sales and fuel are recorded based on current month prices and estimated volumes. The estimates are reversed in the following month when we record actual volumes.

We evaluate our estimates on an ongoing basis using historical experience, consultation with experts and other methods we consider reasonable based on the particular circumstances. Nevertheless, actual results may differ significantly from the estimates. Any effects on our financial position or results of operations from revisions to these estimates are recorded in the period when the facts that give rise to the revision become known.

Fair Value Measurements - For our fair value measurements, we utilize market prices, third-party pricing services, present value methods and standard option valuation models to determine the price we would receive from the sale of an asset or the transfer of a liability in an orderly transaction at the measurement date. We measure the fair value of a group of financial assets and liabilities consistent with how a market participant would price the net risk exposure at the measurement date.

Many of the contracts in our derivative portfolio are executed in liquid markets where price transparency exists. Our financial commodity derivatives are generally settled through a NYMEX or ICE clearing broker account with daily margin requirements. We validate our valuation inputs with third-party information and settlement prices from other sources, where available.

We compute the fair value of our derivative portfolio by discounting the projected future cash flows from our derivative assets and liabilities to present value using interest-rate yields to calculate present-value discount factors derived from the implied forward SOFR, LIBOR or other yield curve, as appropriate. The fair value of our forward-starting interest-rate swaps is determined using financial models that incorporate the implied forward LIBOR yield curve for the same period as the future interest-rate swap settlements. We consider current market data in evaluating counterparties’, as well as our own, nonperformance risk, net of collateral, by using counterparty-specific bond yields. Although we use our best estimates to determine the fair value of the derivative contracts we have executed, the ultimate market prices realized could differ materially from our estimates.

Fair Value Hierarchy - At each balance sheet date, we utilize a fair value hierarchy to classify fair value amounts recognized or disclosed in our financial statements based on the observability of inputs used to estimate such fair value. The levels of the hierarchy are described below:

•Level 1 - fair value measurements are based on unadjusted quoted prices for identical securities in active markets. These balances are composed predominantly of exchange-traded derivative contracts for natural gas and crude oil.

•Level 2 - fair value measurements are based on significant observable pricing inputs, including quoted prices for similar assets and liabilities in active markets and inputs from third-party pricing services supported with corroborative evidence. These balances are composed of exchange cleared derivatives to hedge natural gas basis and NGL price risk at certain market locations and over-the-counter interest-rate derivatives.

•Level 3 - fair value measurements are based on inputs that may include one or more unobservable inputs, including internally developed commodity price curves that incorporate market data from broker quotes and third-party pricing services. These balances are composed predominantly of exchange-cleared and over-the-counter derivatives to hedge NGL price risk at certain market locations. These commodity derivatives are generally valued using forward quotes provided by third-party pricing services that are validated with other market data. We believe any measurement uncertainty at December 31, 2021, is immaterial as our Level 3 fair value measurements are based on unadjusted pricing information from broker quotes and third-party pricing services.

Determining the appropriate classification of our fair value measurements within the fair value hierarchy requires management’s judgment regarding the degree to which market data is observable or corroborated by observable market data. We categorize derivatives based on the lowest level input that is significant to the fair value measurement in its entirety.

See Note B for our fair value measurements disclosures.

Cash and Cash Equivalents - Cash equivalents consist of highly liquid investments, which are readily convertible into cash and have original maturities of three months or less.

Revenue Recognition - Revenues are recognized when control of the promised goods or services is transferred to our customers in an amount that reflects the consideration we expect to be entitled to receive in exchange for those goods or services. Our payment terms vary by customer and contract type, including requiring payment before products or services are delivered to certain customers. However, the term between customer prepayments, completion of our performance obligations, invoicing and receipt of payment due is not significant.

Performance Obligations and Revenue Sources - Revenue sources are disaggregated in Note Q and are derived from commodity sales and services revenues, as described below:

Commodity Sales (all segments) - We contract to deliver residue natural gas, condensate, unfractionated NGLs and/or NGL products to customers at a specified delivery point. Our sales agreements may be daily or longer-term contracts for a specified volume. We consider the sale and delivery of each unit of a commodity an individual performance obligation as the customer is expected to control, accept and benefit from each unit individually. We record revenue when the commodity is delivered to the customer as this represents the point in time when control of the product is transferred to the customer. Revenue is recorded based on the contracted selling price, which is generally index-based and settled monthly.

Services

Gathering only contracts (Natural Gas Gathering and Processing segment) - Under this type of contract, we charge fees for providing midstream services, which include gathering and treating our customer’s natural gas. Our performance obligation begins with delivery of raw natural gas to our system. This service is treated as one performance obligation that is satisfied over time. We use the output method based on delivery of product to our system as the measure of progress, as our services are performed simultaneously.

Fee with POP contracts with producer take-in-kind rights (Natural Gas Gathering and Processing segment) - Under this type of contract, we do not control the stream of unprocessed natural gas that we receive at the wellhead due to the producer’s take-in-kind rights. We purchase a portion of the raw natural gas stream, charge fees for providing midstream services, which include gathering, treating, compressing and processing our customer’s natural gas. After performing these services, we return primarily the residue natural gas to the producer, sell the remaining commodities and remit a portion of the commodity sales proceeds to the producer less our contractual fees. Our performance obligation begins with delivery of raw natural gas to our system. This service is treated as one performance obligation that is satisfied over time. We use the output method based on delivery of product to our system as the measure of progress, as our services are performed simultaneously.

Transportation and exchange contracts (Natural Gas Liquids segment) - Under this type of contract, we charge fees for providing midstream services, which may include a bundled combination of gathering, transporting and/or fractionation of our customer’s NGLs. Our performance obligation begins with delivery of unfractionated NGLs or NGL products to our system. These services represent a series of distinct services that are treated as one performance obligation that is satisfied over time. We use the output method based on delivery of product to our system as the measure of progress, as our services are performed simultaneously. For transportation services under a tariff on our NGL transportation pipelines, fees are recorded upon redelivery to our customer at the completion of the transportation services.

Storage contracts (Natural Gas Liquids and Natural Gas Pipelines segments) - We reserve a stated storage capacity and inject/withdraw/store commodities for our customer. The capacity reservation and injection/withdrawal/storage services are considered a bundled service, as we integrate them into one stand-ready obligation provided on a daily basis over the life of the agreement and satisfied over time. Fixed capacity reservation fees are allocated and evenly recognized in revenue. Capacity reservation fees that vary based on a stated or implied economic index and correspond with the costs to provide our services are recognized in revenue as invoiced to our customers. For contracts that do not include a capacity reservation, transportation, injection and withdrawal fees are recognized in revenue as those services are provided and are dependent on the volume transported, injected or withdrawn by our customer, which is at our customer’s discretion. We use the output method based on the passage of time to measure satisfaction of the performance obligation associated with our daily stand-ready services.

Firm service transportation contracts (Natural Gas Pipelines segment) - We reserve a stated transportation capacity and transport commodities for our customer. The capacity reservation and transportation services are considered a bundled service, as we integrate them into one stand-ready obligation provided on a daily basis over the life of the agreement and satisfied over time. Fixed capacity reservation fees are allocated and evenly recognized in revenue. Capacity reservation fees that vary based on a stated or implied economic index and correspond with the costs to provide our services are recognized in revenue based on a daily effective fee rate. If the capacity reservation fees vary solely as a contract feature, contract assets or liabilities are recorded for the difference between the amount recorded in revenue and the amount billed to the customer. Transportation fees are recognized in revenue as those services are provided and are dependent on the volume transported by our customer, which is at our customer’s discretion. We use the output method based on the passage of time to measure satisfaction of the performance obligation associated with our daily stand-ready services.

Interruptible transportation contracts (Natural Gas Pipelines segment) - We agree to transport natural gas on our pipelines between the customer’s nominated receipt and delivery points if capacity is available after satisfying firm transportation service obligations. The transaction price is based on the transportation fees times the volumes transported. We use the output method

based on delivery of product to the customer to measure satisfaction of the performance obligation. The total consideration for delivered volumes is recorded in revenue at the time of delivery, when the customer obtains control.

Many of the contract types described above contain additional fees or charges payable by customers for nonperformance (e.g., minimum volume commitments or product specifications), which are considered to be variable consideration. These fees and charges are not recorded until it is probable that a significant reversal of the associated revenue will not occur.

See Note P for our revenue disclosures.

Contract Assets and Contract Liabilities - Contract assets and contract liabilities are recorded when the amount of revenue recognized from a contract with a customer differs from the amount billed to the customer and recorded in accounts receivable. Our contract asset balances at the beginning and end of the period primarily relate to our firm service transportation contracts with tiered rates. Our contract liabilities primarily represent deferred revenue on NGL storage contracts for which revenue is recognized over a one-year term, and deferred revenue on contributions in aid of construction received from customers for which revenue is recognized over the contract periods, which range from 5 to 10 years.

Cost of Sales and Fuel - Cost of sales and fuel primarily includes (i) the cost of purchased commodities, including NGLs, natural gas and condensate, (ii) fees incurred for third-party transportation, fractionation and storage of commodities, (iii) fuel and power costs incurred to operate our own facilities that gather, process, transport and store commodities, and (iv) an offset from the contractual fees deducted from the cost of purchased commodities under the contract types below:

Fee with POP contracts with no producer take-in-kind rights (Natural Gas Gathering and Processing segment) - We purchase raw natural gas and charge contractual fees for providing midstream services, which include gathering, treating, compressing and processing the producer’s natural gas. After performing these services, we sell the commodities and return a portion of the commodity sales proceeds to the producer less our contractual fees.

Purchase with fee (Natural Gas Liquids segment) - Under this type of contract, we purchase raw, unfractionated NGLs at an index price and charge fees for providing midstream services, which may include a bundled combination of gathering, transporting and/or fractionation of our customer’s NGLs.

Operations and Maintenance - Operations and maintenance primarily includes (i) payroll and benefit costs, (ii) third-party costs for operations, maintenance and integrity management, regulatory compliance and environmental and safety, and (iii) other business-related service costs.

Accounts Receivable - Accounts receivable represent valid claims against nonaffiliated customers for products sold or services rendered. We present accounts receivable net of an allowance for credit losses to reflect the net amount expected to be collected. We assess the creditworthiness of our counterparties on an ongoing basis and require security, including prepayments and other forms of collateral, when appropriate. Outstanding customer receivables are reviewed regularly for possible nonpayment indicators, and allowances for credit losses are recorded based upon management’s estimate of collectability, current conditions and supportable forecasts at each balance sheet date. At December 31, 2021, our allowance for credit losses was not material.

Inventory - The values of current NGLs and natural gas in storage are determined using the lower of weighted-average cost or net realizable value. Noncurrent NGLs and natural gas are classified as property and valued at cost. Materials and supplies are valued at average cost. Certain large equipment inventory, which will ultimately be included in property, plant and equipment when utilized, is included in other assets in our Consolidated Balance Sheets and is valued at weighted-average cost.

Commodity Imbalances - Commodity imbalances represent amounts payable or receivable for NGL exchange contracts and natural gas pipeline imbalances and are valued at market prices. Under the majority of our NGL exchange agreements, we physically receive volumes of unfractionated NGLs, including the risk of loss and legal title to such volumes, from the exchange counterparty. In turn, we deliver NGL products back to the customer and charge them gathering, transportation and fractionation fees. To the extent that the volumes we receive under such agreements differ from those we deliver, we record a net exchange receivable or payable position with the counterparties. These net exchange receivables and payables are generally settled with movements of NGL products rather than with cash. Natural gas pipeline imbalances are settled in cash or in-kind, subject to the terms of the pipelines’ tariffs or by agreement.

Derivatives and Risk Management - We utilize derivatives to reduce our market-risk exposure to commodity price and interest-rate fluctuations and to achieve more predictable cash flows. We record all derivative instruments at fair value, with the exception of normal purchases and normal sales transactions that are expected to result in physical delivery. Commodity price and interest-rate volatility may have a significant impact on the fair value of derivative instruments as of a given date. The accounting for changes in the fair value of a derivative instrument depends on whether it has been designated and qualifies as part of a hedging relationship and, if so, the reason for holding it. The table below summarizes the various ways in which we account for our derivative instruments and the impact on our Consolidated Financial Statements:

		Recognition and Measurement
Accounting Treatment		Balance Sheet		Income Statement
Normal purchases and normal sales	-	Fair value not recorded	-	Change in fair value not recognized in earnings
Mark-to-market	-	Recorded at fair value	-	Change in fair value recognized in earnings
Cash flow hedge	-	Recorded at fair value. The gain or loss on the derivative instrument is reported initially as a component of accumulated other comprehensive income (loss)	-	The gain or loss on the derivative instrument is reclassified out of accumulated other comprehensive income (loss) into earnings when the forecasted transaction affects earnings
Fair value hedge	-	Recorded at fair value	-	The gain or loss on the derivative instrument is recognized in earnings
	-	Change in fair value of the hedged item is recorded as an adjustment to book value	-	Change in fair value of the hedged item is recognized in earnings

To reduce our exposure to fluctuations in natural gas, NGLs and condensate prices, we periodically enter into futures, forward purchases and sales, options or swap transactions in order to hedge anticipated purchases and sales of natural gas, NGLs and condensate. Interest-rate swaps are used from time to time to manage interest-rate risk. Under certain conditions, we designate our derivative instruments as a hedge of exposure to changes in fair values or cash flows. We formally document all relationships between hedging instruments and hedged items, as well as risk-management objectives and strategies for undertaking various hedge transactions, and methods for assessing and testing correlation and hedge effectiveness. We specifically identify the forecasted transaction that has been designated as the hedged item in a cash flow hedge relationship. We assess hedging relationships at the inception of the hedge and on an ongoing basis to determine whether the hedging relationship is, and is expected to remain, highly effective. We also document our normal purchases and normal sales transactions that we expect to result in physical delivery and that we elect to exempt from derivative accounting treatment.

The realized revenues and purchase costs of our derivative instruments not considered held for trading purposes and derivatives that qualify as normal purchases or normal sales that are expected to result in physical delivery are reported on a gross basis.

Cash flows from futures, forwards, options and swaps that are accounted for as hedges are included in the same category as the cash flows from the related hedged items in our Consolidated Statements of Cash Flows.

See Notes B and C for disclosures of our fair value measurements and risk-management and hedging activities, respectively.

Property, Plant and Equipment - Our properties are stated at cost, including AFUDC and capitalized interest. In some cases, the cost of regulated property retired or sold, plus removal costs, less salvage, is charged to accumulated depreciation. Gains and losses from sales or transfers of nonregulated properties or an entire operating unit or system of our regulated properties are recognized in income. Maintenance and repairs are charged directly to expense.

The interest portion of AFUDC and capitalized interest represent the cost of borrowed funds used to finance construction activities for regulated and nonregulated projects, respectively. We capitalize interest costs during the construction or upgrade of qualifying assets. These costs are recorded as a reduction to interest expense. The equity portion of AFUDC represents the capitalization of the estimated average cost of equity used during the construction of major projects and is recorded in the cost of our regulated properties and as a credit to the allowance for equity funds used during construction.

Our properties are depreciated using the straight-line method over their estimated useful lives. Generally, we apply depreciation rates to functional groups of property having similar economic lives. We periodically conduct depreciation studies to assess the economic lives of our assets. For our regulated assets, these depreciation studies are completed as a part of our rate proceedings or tariff filings, and the changes in economic lives, if applicable, are implemented prospectively when the new rates are approved. For our nonregulated assets, if it is determined that the estimated economic life changes, the changes are made prospectively. Changes in the estimated economic lives of our property, plant and equipment could have a material effect on our financial position or results of operations.

Property, plant and equipment on our Consolidated Balance Sheets includes construction work in process for capital projects that have not yet been placed in service and therefore are not being depreciated. Assets are transferred out of construction work in process when they are substantially complete and ready for their intended use.

See Note D for our property, plant and equipment disclosures.

Impairment of Goodwill and Long-Lived Assets, Including Intangible Assets - We assess our goodwill for impairment at least annually as of July 1, unless events or changes in circumstances indicate an impairment may have occurred before that time. Our qualitative goodwill impairment analysis performed as of July 1, 2021, did not result in an impairment charge nor did our analysis reflect any reporting units at risk, and subsequent to that date, no event has occurred indicating that the implied fair value of each of our reporting units is less than the carrying value of its net assets.

Goodwill - As part of our goodwill impairment test, we assess qualitative factors (including macroeconomic conditions, industry and market considerations, cost factors and overall financial performance) to determine whether it was more likely than not that the fair value of each of our reporting units was less than their carrying amount. If further testing is necessary or a quantitative test is elected, we perform a Step 1 analysis. In a Step 1 analysis, an assessment is made by comparing the fair value of a reporting unit with its carrying amount, including goodwill. If the carrying value of a reporting unit exceeds its fair value, an impairment loss is recognized in an amount equal to that excess, limited to the total amount of goodwill allocated to that reporting unit.

To estimate the fair value of our reporting units, we use two generally accepted valuation approaches, an income approach and a market approach, using assumptions consistent with a market participant’s perspective. Under the income approach, we use anticipated cash flows over a period of years plus a terminal value and discount these amounts to their present value using appropriate discount rates. Under the market approach, we apply EBITDA multiples to forecasted EBITDA. The multiples used are consistent with recent market transactions. The forecasted cash flows are based on probability weighted-average possible future cash flows for a reporting unit over a period of years.

Long-lived assets - We assess our long-lived assets for impairment whenever events or changes in circumstances indicate that an asset’s carrying amount may not be recoverable. An impairment is indicated if the carrying amount of a long-lived asset exceeds the sum of the undiscounted future cash flows expected to result from the use and eventual disposition of the asset. If an impairment is indicated, we record an impairment loss equal to the difference between the carrying value and the fair value of the long-lived asset.

Investments in unconsolidated affiliates - The impairment test for equity-method investments considers whether the fair value of the equity investment as a whole, not the underlying net assets, has declined and whether that decline is other than temporary. Therefore, we periodically evaluate the amount at which we carry our equity-method investments to determine whether current events or circumstances warrant adjustments to our carrying values.

See Notes D, E and M for our disclosures and related impairment charges related to long-lived assets, goodwill and intangible assets and investments in unconsolidated affiliates, respectively.

Regulation - Depending on the specific service provided, our natural gas transmission pipelines, NGL pipelines and certain natural gas storage facilities are subject to rate regulation and/or accounting requirements by one or more of the FERC, OCC, KCC and RRC. Accordingly, portions of our Natural Gas Liquids and Natural Gas Pipelines segments follow the accounting and reporting guidance for regulated operations. In our Consolidated Financial Statements and our Notes to Consolidated Financial Statements, regulated operations are defined pursuant to Financial Accounting Standards Board’s (FASB) Accounting Standards Codification 980, Regulated Operations. During the rate-making process for certain of our assets, regulatory authorities set the framework for what we can charge customers for our services and establish the manner that our costs are accounted for, including allowing us to defer recognition of certain costs and permitting recovery of the amounts through rates over time as opposed to expensing such costs as incurred. Certain examples of types of regulatory guidance include costs for fuel and losses, acquisition costs, contributions in aid of construction, charges for depreciation, and gains or losses on disposition of assets. This allows us to stabilize rates over time rather than passing such costs on to the customer for immediate recovery. Actions by regulatory authorities could have an effect on the amounts we may charge our customers. Any difference in the amount recoverable and the amount deferred is recorded as income or expense at the time of the regulatory action. A write-off of regulatory assets and costs not recovered may be required if all or a portion of the regulated operations have rates that are no longer (i) established by independent, third-party regulators and (ii) set at levels that will recover our costs when considering the demand and competition for our services.

Retirement and Other Postretirement Employee Benefits - We have defined benefit retirement plans covering certain employees and former employees. We sponsor welfare plans that provide postretirement medical and life insurance benefits to certain employees hired prior to 2017 who retire with at least five years of service. The expense and liability related to these plans is calculated using statistical and other factors that attempt to anticipate future events. These factors include assumptions about the discount rate, expected return on plan assets, rate of future compensation increases, mortality and employment length. In determining the projected benefit obligations and costs, assumptions can change from period to period and may result in changes in the costs and liabilities we recognize.

See Note K for our retirement and other postretirement employee benefits disclosures.

Income Taxes - Deferred income taxes are provided for the difference between the financial statement and income tax basis of assets and liabilities and carryforward items based on income tax laws and rates existing at the time the temporary differences are expected to reverse. Generally, the effect of a change in tax rates on deferred tax assets and liabilities is recognized in income in the period that includes the enactment date of the rate change.

We utilize a more-likely-than-not recognition threshold and measurement attribute for the financial statement recognition and measurement of a tax position that is taken or expected to be taken in a tax return. We reflect penalties and interest as part of income tax expense as they become applicable for tax provisions that do not meet the more-likely-than-not recognition threshold and measurement attribute. For all periods presented, we had no uncertain tax positions that required the establishment of a material reserve.

We utilize the “with-and-without” approach for intra-period tax allocation for purposes of allocating total tax expense (or benefit) for the year among the various financial statement components.

We file numerous consolidated and separate income tax returns with federal tax authorities of the United States along with the tax authorities of several states. We are not under any United States federal audits or statute waivers at this time.

See Note L for our income taxes disclosures.

Asset Retirement Obligations - Asset retirement obligations represent legal obligations associated with the retirement of long-lived assets that result from the acquisition, construction, development and/or normal use of the asset. Certain of our natural gas gathering and processing, NGL and natural gas pipeline facilities are subject to agreements or regulations that give rise to our asset retirement obligations for removal or other disposition costs associated with retiring the assets in place upon the discontinued use of the assets. We recognize the fair value of a liability for an asset retirement obligation in the period when it is incurred if a reasonable estimate of the fair value can be made. We are not able to estimate reasonably the fair value of the asset retirement obligations for portions of our assets, primarily certain pipeline assets, because the settlement dates are indeterminable given our expected continued use of the assets with proper maintenance. We expect our pipeline assets, for which we are unable to estimate reasonably the fair value of the asset retirement obligation, will continue in operation as long as supply and demand for natural gas and NGLs exist. Based on the widespread use of natural gas for heating and cooking activities for residential users and electric-power generation for commercial users, as well as use of NGLs by the petrochemical industry, we expect supply and demand to exist for the foreseeable future.

For our assets that we are able to make an estimate, the fair value of the liability is added to the carrying amount of the associated asset, and this additional carrying amount is depreciated over the life of the asset. The liability is accreted at the end of each period through charges to operating expense. If the obligation is settled for an amount other than the carrying amount of the liability, we will recognize a gain or loss on settlement. The depreciation and accretion expense are immaterial to our Consolidated Financial Statements.

Contingencies - Our accounting for contingencies covers a variety of business activities, including contingencies for legal and environmental exposures. We accrue these contingencies when our assessments indicate that it is probable that a liability has been incurred or an asset will not be recovered and an amount can be estimated reasonably. We expense legal fees as incurred and base our legal liability estimates on currently available facts and our estimates of the ultimate outcome or resolution. Accruals for estimated losses from environmental remediation obligations generally are recognized no later than completion of a remediation feasibility study. Recoveries of environmental remediation costs from other parties are recorded as assets when their receipt is deemed probable. Our expenditures for environmental evaluation, mitigation, remediation and compliance to date have not been significant in relation to our financial position or results of operations, and our expenditures related to environmental matters had no significant effect on earnings or cash flows during 2021, 2020 and 2019. Actual results may differ from our estimates resulting in an impact, positive or negative, on earnings.

See Note N for additional discussion of contingencies.

Share-Based Payments - We expense the fair value of share-based payments net of estimated forfeitures. We estimate forfeiture rates based on historical forfeitures under our share-based payment plans.

See Note J for our share-based payments disclosures.

Earnings per Common Share - Basic EPS is calculated by dividing net income available to common shareholders by the daily weighted-average number of shares of common stock outstanding during the period, vested restricted and performance units that have been deferred and share awards deferred under the compensation plan for non-employee directors. Diluted EPS is calculated by dividing net income available to common shareholders by the daily weighted-average number of shares of common stock outstanding during the period plus potentially dilutive components. The dilutive components are calculated based on the dilutive effect for each quarter. For fiscal-year periods, the dilutive components for each quarter are averaged to arrive at the fiscal year-to-date dilutive component.

See Note I for our EPS disclosures.

Segment Reporting - Our chief operating decision-maker reviews the financial performance of each of our three segments, as well as our financial performance as a whole, on a regular basis. Adjusted EBITDA by segment is utilized in this evaluation. We believe this financial measure is useful to investors because it and similar measures are used by many companies in our industry as a measurement of financial performance and are commonly employed by financial analysts and others to evaluate our financial performance and to compare financial performance among companies in our industry. Adjusted EBITDA for each segment is defined as net income adjusted for interest expense, depreciation and amortization, noncash impairment charges, income taxes, allowance for equity funds used during construction, noncash compensation expense, and other noncash items. This calculation may not be comparable with similarly titled measures of other companies.

See Note Q for our segments disclosures.

Recently Issued Accounting Standards Update - Changes to GAAP are established by the FASB in the form of ASUs to the FASB Accounting Standards Codification. We consider the applicability and impact of all ASUs. ASUs not listed below were assessed and determined to be either not applicable or clarifications of ASUs previously issued or listed below. Except as discussed below, there have been no new accounting pronouncements that have become effective or have been issued that are of significance or potential significance to us.

In January 2021, we adopted ASU 2019-12, “Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes,” which simplifies certain concepts in Topic 740, Income Taxes. The impact of adopting this standard was not material.

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FAIR VALUE MEASUREMENTS (Notes)

12 Months Ended

Dec. 31, 2021

Fair Value Disclosures [Abstract]

FAIR VALUE MEASUREMENTS

FAIR VALUE MEASUREMENTS

Recurring Fair Value Measurements - The following tables set forth our recurring fair value measurements for the periods indicated:

	December 31, 2021
	Level 1		Level 2		Level 3		Total - Gross		Netting (a)		Total - Net
	(Thousands of dollars)
Derivative assets
Commodity contracts
Financial contracts	$	22,019	$	172,833	$	9,309	$	204,161	$	(204,161)	$	—
Total derivative assets	$	22,019	$	172,833	$	9,309	$	204,161	$	(204,161)	$	—
Derivative liabilities
Commodity contracts
Financial contracts	$	(67,226)	$	(112,922)	$	(123,592)	$	(303,740)	$	303,740	$	—
Interest-rate contracts	—		(145,524)		—		(145,524)		—		(145,524)
Total derivative liabilities	$	(67,226)	$	(258,446)	$	(123,592)	$	(449,264)	$	303,740	$	(145,524)

(a) - Derivative assets and liabilities are presented in our Consolidated Balance Sheet on a net basis. We net derivative assets and liabilities when a legally enforceable master-netting arrangement exists between the counterparty to a derivative contract and us. At December 31, 2021, we held no cash and posted $157.0 million of cash with various counterparties, including $99.6 million of cash collateral that is

offsetting derivative net liability positions under master-netting arrangements in the table above. The remaining $57.4 million of cash collateral in excess of derivative net liability positions is included in other current assets in our Consolidated Balance Sheet.

	December 31, 2020
	Level 1		Level 2		Level 3		Total - Gross		Netting (a)		Total - Net
	(Thousands of dollars)
Derivative assets
Commodity contracts
Financial contracts	$	6,697	$	—	$	103,801	$	110,498	$	(110,498)	$	—
Total derivative assets	$	6,697	$	—	$	103,801	$	110,498	$	(110,498)	$	—
Derivative liabilities
Commodity contracts
Financial contracts	$	(10,489)	$	—	$	(135,122)	$	(145,611)	$	145,611	$	—
Interest-rate contracts	—		(203,407)		—		(203,407)		—		(203,407)
Total derivative liabilities	$	(10,489)	$	(203,407)	$	(135,122)	$	(349,018)	$	145,611	$	(203,407)

(a) - Derivative assets and liabilities are presented in our Consolidated Balance Sheet on a net basis. We net derivative assets and liabilities when a legally enforceable master-netting arrangement exists between the counterparty to a derivative contract and us. At December 31, 2020, we held no cash and posted $63.1 million of cash with various counterparties, including $35.1 million of cash collateral that is offsetting derivative net liability positions under master-netting arrangements in the table above. The remaining $28.0 million of cash collateral in excess of derivative net liability positions is included in other current assets in our Consolidated Balance Sheet.

The following table sets forth a reconciliation of our Level 3 fair value measurements for the periods indicated:

	Years Ended
	December 31,
Derivative Assets (Liabilities)	2021		2020
	(Thousands of dollars)
Net assets (liabilities) at beginning of period	$	(31,321)	$	30,772
Total changes in fair value:
Settlements included in net income (a)	31,003		(31,660)
Transfers out of Level 3 derivatives	(59,911)		—
New Level 3 derivatives included in other comprehensive income (loss) (b)	(57,325)		(36,568)
Unrealized change included in other comprehensive income (loss) (b)	3,271		6,135
Net liabilities at end of period	$	(114,283)	$	(31,321)

(a) - Included in commodity sales revenues/cost of sales and fuel in our Consolidated Statements of Income.

(b) - Included in change in fair value of derivatives in our Consolidated Statements of Comprehensive Income.

During the year ended December 31, 2021, transfers out of Level 3 related to commodity derivatives associated with certain locations for both NGL and natural gas basis swaps were principally due to improved transparency of market prices as a result of the volume and frequency of transactions in these markets. We consider the valuation of these commodity derivatives transacted through a clearing broker and valued with an unadjusted published price from an exchange as a Level 2 valuation. Our Level 3 fair value measurements continue to include NGL derivatives in other markets valued using forward quotes provided by third-party pricing services that are validated with other unobservable market data. During the year ended December 31, 2020, there were no transfers in or out of Level 3 of the fair value hierarchy.

Other Financial Instruments - The approximate fair value of cash and cash equivalents, accounts receivable, accounts payable and short-term borrowings is equal to book value due to the short-term nature of these items. Our cash and cash equivalents are composed of bank and money market accounts and are classified as Level 1. Our short-term borrowings are classified as Level 2 since the estimated fair value of the short-term borrowings can be determined using information available in the commercial paper market. We have investments at December 31, 2021, associated with our supplemental executive retirement plan and nonqualified deferred compensation plan that are carried at fair value and primarily composed of exchange-traded mutual funds classified as Level 1.

The estimated fair value of our consolidated long-term debt, including current maturities, was $15.6 billion and $16.3 billion at December 31, 2021 and 2020, respectively. The book value of our consolidated long-term debt, including current maturities, was $13.6 billion and $14.2 billion at December 31, 2021 and 2020, respectively. The estimated fair value of the aggregate

senior notes outstanding was determined using quoted market prices for similar issues with similar terms and maturities. The estimated fair value of our consolidated long-term debt is classified as Level 2.

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RISK MANAGEMENT AND HEDGING ACTIVITIES USING DERIVATIVES (Notes)

12 Months Ended

Dec. 31, 2021

Derivative Instruments and Hedging Activities Disclosure [Abstract]

RISK MANAGEMENT AND HEDGING ACTIVITIES USING DERIVATIVES

RISK-MANAGEMENT AND HEDGING ACTIVITIES USING DERIVATIVES

Risk-management Activities - We are sensitive to changes in natural gas, crude oil and NGL prices, principally as a result of contractual terms under which these commodities are processed, purchased and sold. We are also subject to the risk of interest-rate fluctuation in the normal course of business. We use physical-forward purchases and sales and financial derivatives to secure a certain price for a portion of our natural gas, condensate and NGL products; to reduce our exposure to commodity price and interest-rate fluctuations; and to achieve more predictable cash flows. We follow established policies and procedures to assess risk and approve, monitor and report our risk-management activities. We have not used these instruments for trading purposes.

Commodity price risk - Commodity price risk refers to the risk of loss in cash flows and future earnings arising from adverse changes in the price of natural gas, NGLs and condensate. We may use the following commodity derivative instruments to reduce the near-term commodity price risk associated with a portion of the forecasted sales of these commodities:

•Futures contracts - Standardized contracts to purchase or sell natural gas and crude oil for future delivery or settlement under the provisions of exchange regulations;

•Forward contracts - Nonstandardized commitments between two parties to purchase or sell natural gas, crude oil or NGLs for future physical delivery. These contracts are typically nontransferable and can only be canceled with the consent of both parties;

•Swaps - Exchange of one or more payments based on the value of one or more commodities. These instruments transfer the financial risk associated with a future change in value between the counterparties of the transaction, without also conveying ownership interest in the asset or liability;

•Options - Contractual agreements that give the holder the right, but not the obligation, to buy or sell a fixed quantity of a commodity at a fixed price within a specified period of time. Options may either be standardized and exchange-traded or customized and nonexchange-traded; and

•Collar - Combination of a purchased put option and a sold call option, which places a floor and ceiling price for commodity sales being hedged.

We may also use other instruments to mitigate commodity price risk.

In our Natural Gas Gathering and Processing segment, we are exposed to commodity price risk as a result of retaining a portion of the commodity sales proceeds associated with our fee with POP contracts. Under certain fee with POP contracts, our fees and POP percentage may increase or decrease if production volumes, delivery pressures or commodity prices change relative to specified thresholds. In certain commodity price environments, our contractual fees on these fee with POP contracts may decrease, which would impact the average fee rate in our Natural Gas Gathering and Processing segment. We also are exposed to basis risk between the various production and market locations where we buy and sell commodities. As part of our hedging strategy, we use the previously described commodity derivative financial instruments and physical-forward contracts to reduce the impact of price fluctuations related to natural gas, NGLs and condensate.

In our Natural Gas Liquids segment, we are primarily exposed to commodity price risk resulting from the relative values of the various NGL products to each other, the value of NGLs in storage and the relative value of NGLs to natural gas. We are also exposed to location price differential risk as a result of the relative value of NGL purchases at one location and sales at another location, primarily related to our optimization and marketing business. As part of our hedging strategy, we utilize physical-forward contracts and commodity derivative financial instruments to reduce the impact of price fluctuations related to NGLs.

In our Natural Gas Pipelines segment, we are primarily exposed to commodity price risk on our intrastate pipelines because they consume natural gas in operations and retain natural gas from our customers for operations or as part of our fee for services provided. When the amount consumed in operations differs from the amount provided by our customers, our pipelines must buy or sell natural gas, or store or use natural gas inventory, which can expose this segment to commodity price risk depending on the regulatory treatment for this activity. To the extent that commodity price risk in our Natural Gas Pipelines segment is not mitigated by fuel cost-recovery mechanisms, we may use physical-forward sales or purchases to reduce the impact of natural gas price fluctuations. At December 31, 2021 and 2020, there were no financial derivative instruments with respect to our natural gas pipeline operations.

Interest-rate risk - We may manage interest-rate risk through the use of fixed-rate debt, floating-rate debt and interest-rate swaps. Interest-rate swaps are agreements to exchange interest payments at some future point based on specified notional

amounts. In 2020, we settled $750 million of our forward-starting interest-rate swaps related to our underwritten public offerings of $1.75 billion senior unsecured notes resulting in a loss of $152.5 million, which is included in accumulated other comprehensive loss and amortized to interest expense over the term of the related debt. We also settled the remaining $1.3 billion of our interest-rate swaps used to hedge our LIBOR-based interest payments in 2020 resulting in a loss of $48.3 million.

At December 31, 2021, and December 31, 2020, we had forward-starting interest-rate swaps with notional amounts totaling $1.1 billion to hedge the variability of interest payments on a portion of our forecasted debt issuances. All of our interest-rate swaps are designated as cash flow hedges.

Fair Values of Derivative Instruments - See Note A for a discussion of the inputs associated with our fair value measurements. The following table sets forth the fair values of our derivative instruments presented on a gross basis for the periods indicated:

		December 31, 2021				December 31, 2020
	Location in our Consolidated Balance Sheets	Assets		(Liabilities)		Assets		(Liabilities)
		(Thousands of dollars)
Derivatives designated as hedging instruments
Commodity contracts (a)
Financial contracts (b)		$	204,161	$	(303,740)	$	107,461	$	(142,573)
Interest-rate contracts	Other current liabilities	—		(145,524)		—		—
	Other deferred credits	—		—		—		(203,407)
Total derivatives designated as hedging instruments		204,161		(449,264)		107,461		(345,980)
Derivatives not designated as hedging instruments
Commodity contracts (a)
Financial contracts (b)		—		—		3,037		(3,038)
Total derivatives not designated as hedging instruments		—		—		3,037		(3,038)
Total derivatives		$	204,161	$	(449,264)	$	110,498	$	(349,018)

(a) - Derivative assets and liabilities are presented in our Consolidated Balance Sheets on a net basis when a legally enforceable master-netting arrangement exists between the counterparty to a derivative contract and us.

(b) - At December 31, 2021, and December 31, 2020, our derivative net liability positions under master-netting arrangements for financial contracts were fully offset by cash collateral of $99.6 million and $35.1 million, respectively.

Notional Quantities for Derivative Instruments - The following table sets forth the notional quantities for derivative instruments held for the periods indicated:

		December 31, 2021		December 31, 2020
	Contract Type	Net Purchased/Payor (Sold/Receiver)
Derivatives designated as hedging instruments: (a)
Cash flow hedges
Fixed price
-Natural gas (Bcf)	Futures	(32.3)		(43.3)
-Crude oil and NGLs (MMBbl)	Futures	(10.0)		(4.6)
Basis
-Natural gas (Bcf)	Futures	(30.5)		(43.3)
Interest-rate contracts (Billions of dollars)	Swaps	$	1.1	$	1.1

(a) - Notional amounts for derivatives not designated as hedging instruments are excluded from the table above due to fully offsetting notional quantities of 0.8 MMBbl for NGLs fixed priced derivative instruments at December 31, 2020.

Cash Flow Hedges - The following table sets forth the unrealized change in fair value of cash flow hedges in other comprehensive income (loss) for the periods indicated:

	Years Ended December 31,
	2021		2020		2019
	(Thousands of dollars)
Commodity contracts	$	(322,648)	$	(5,699)	$	38,819
Interest-rate contracts	57,884		(208,616)		(230,771)
Total unrealized change in fair value of cash flow hedges in other comprehensive income (loss)	$	(264,764)	$	(214,315)	$	(191,952)

The following table sets forth the effect of cash flow hedges on net income for the periods indicated:

Derivatives in Cash Flow Hedging Relationships	Location of Gain (Loss) Reclassified from Accumulated Other Comprehensive Loss into Net Income
		Years Ended December 31,
		2021		2020		2019
		(Thousands of dollars)
Commodity contracts	Commodity sales revenues	$	(731,793)	$	85,436	$	94,547
	Cost of sales and fuel	473,612		(19,170)		(44,202)
Interest-rate contracts (a)	Interest expense	(39,952)		(93,676)		(23,230)
Total change in fair value of cash flow hedges reclassified from accumulated other comprehensive loss into net income on derivatives		$	(298,133)	$	(27,410)	$	27,115

(a) - The year ended December 31, 2020, includes a loss of $48.3 million on the settlement of $1.3 billion of interest-rate swaps used to hedge our LIBOR-based interest payments.

Credit Risk - We monitor the creditworthiness of our counterparties and compliance with policies and limits established by our Risk Oversight and Strategy Committee. We maintain credit policies with regard to our counterparties that we believe minimize overall credit risk. These policies include an evaluation of potential counterparties’ financial condition (including credit ratings, bond yields and credit default swap rates), collateral requirements under certain circumstances and the use of standardized master-netting agreements that allow us to net the positive and negative exposures associated with a single counterparty. We use internally developed credit ratings for counterparties that do not have a credit rating.

Our financial commodity derivatives are generally settled through a NYMEX or ICE clearing broker account with daily margin requirements. However, we may enter into financial derivative instruments that contain provisions that require us to maintain an investment-grade credit rating from S&P, Fitch and/or Moody’s. If our credit ratings on our senior unsecured long-term debt were to decline below investment grade, the counterparties to the derivative instruments could request collateralization on derivative instruments in net liability positions. There were no financial derivative instruments with contingent features related to credit risk at December 31, 2021.

The counterparties to our derivative contracts typically consist of major energy companies, financial institutions and commercial and industrial end users. This concentration of counterparties may affect our overall exposure to credit risk, either positively or negatively, in that the counterparties may be affected similarly by changes in economic, regulatory or other conditions. Based on our policies, exposures, credit and other reserves, we do not anticipate a material adverse effect on our financial position or results of operations as a result of counterparty nonperformance.

At December 31, 2021, the credit exposure from our derivative assets is with investment-grade companies in the financial services sector.

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PROPERTY, PLANT AND EQUIPMENT (Notes)

12 Months Ended

Dec. 31, 2021

Property, Plant and Equipment [Abstract]

PROPERTY, PLANT AND EQUIPMENT

PROPERTY, PLANT AND EQUIPMENT

The following table sets forth our property, plant and equipment by property type, for the periods indicated:

	Estimated Useful Lives (Years)	December 31, 2021		December 31, 2020
		(Thousands of dollars)
Nonregulated
Gathering pipelines and related equipment	5 to 40	$	4,371,936	$	4,143,752
Processing and fractionation and related equipment	3 to 40	5,356,508		5,084,802
Storage and related equipment	3 to 54	874,522		798,785
Transmission pipelines and related equipment	5 to 54	886,343		810,434
General plant and other	2 to 60	695,117		647,675
Construction work in process	—	1,132,961		1,265,736
Regulated
Storage and related equipment	5 to 25	9,197		9,180
Natural gas transmission pipelines and related equipment	5 to 77	1,660,034		1,569,268
NGL transmission pipelines and related equipment	5 to 88	8,595,968		8,423,544
General plant and other	2 to 50	73,449		72,535
Construction work in process	—	164,504		247,224
Property, plant and equipment		23,820,539		23,072,935
Accumulated depreciation and amortization - nonregulated		(2,885,020)		(2,514,328)
Accumulated depreciation and amortization - regulated		(1,615,645)		(1,403,679)
Net property, plant and equipment		$	19,319,874	$	19,154,928

The average depreciation rates for our regulated property are set forth, by segment, in the following table for the periods indicated:

	Years Ended December 31,
	2021	2020	2019
Natural Gas Liquids	2.2%	2.2%	2.0%
Natural Gas Pipelines	2.1%	2.1%	2.1%

We incurred costs for construction work in process that had not been paid at December 31, 2021, 2020 and 2019, of $130.5 million, $151.7 million and $544.8 million, respectively. Such amounts are not included in capital expenditures (less AFUDC) on the Consolidated Statements of Cash Flows.

Impairment Charges - In 2020, we evaluated our Natural Gas Gathering and Processing segment asset groups and determined that the carrying value of certain long-lived asset groups in the Powder River Basin, western Oklahoma and Kansas were not recoverable and exceeded their estimated fair value. As a result, we recorded noncash impairment charges of $362.3 million, which includes a natural gas processing plant and infrastructure in the Powder River Basin and its related supply contracts and natural gas processing plants and infrastructure in western Oklahoma and Kansas. In our Natural Gas Liquids segment, we recorded noncash impairment charges of $71.6 million related primarily to certain inactive assets, as our expectation for future use of the assets changed. These charges are included within impairment charges in our Consolidated Statement of Income for the year ended December 31, 2020.

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GOODWILL AND INTANGIBLE ASSETS (Notes)

12 Months Ended

Dec. 31, 2021

Goodwill and Intangible Assets Disclosure [Abstract]

GOODWILL AND INTANGIBLE ASSETS

GOODWILL AND INTANGIBLE ASSETS

Goodwill - The following table sets forth our goodwill, by segment, for the periods indicated:

	December 31, 2021		December 31, 2020
	(Thousands of dollars)
Natural Gas Liquids	$	371,217	$	371,217
Natural Gas Pipelines	156,375		156,375
Total goodwill	$	527,592	$	527,592

Impairment Charges - In 2020, we experienced a significant decline in our share price and market capitalization as the energy industry experienced historic events that led to a simultaneous demand and supply disruption. Due to the impact of these events, we tested our goodwill for impairment and concluded that the carrying value of the Natural Gas Gathering and Processing reporting unit exceeded its estimated fair value, resulting in a noncash impairment charge of $153.4 million, which is included within impairment charges in our Consolidated Statement of Income for the year ended December 31, 2020. At December 31, 2021 and 2020, we have no remaining goodwill in our Natural Gas Gathering and Processing segment.

Intangible Assets - Our intangible assets relate primarily to contracts acquired through acquisitions in our Natural Gas Liquids and Natural Gas Gathering and Processing segments, which are being amortized over periods of 15 to 40 years. Amortization expense for intangible assets was $10.4 million in 2021, $10.8 million in 2020, and $11.9 million in 2019, and the aggregate amortization expense for each of the next five years is estimated to be $10.4 million. The following table reflects the gross carrying amount and accumulated amortization of intangible assets for the periods presented:

	December 31, 2021		December 31, 2020
	(Thousands of dollars)
Gross intangible assets	$	381,435	$	381,435
Accumulated amortization	(145,732)		(135,304)
Net intangible assets	$	235,703	$	246,131

Impairment Charges - In 2020 in our Natural Gas Gathering and Processing segment, we recorded noncash impairment charges to intangible assets of $19.9 million related to supply contracts associated with our natural gas processing plant in the Powder River Basin, which was also impaired. These charges are included within impairment charges in our Consolidated Statement of Income for the year ended December 31, 2020.

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DEBT (Notes)

12 Months Ended

Dec. 31, 2021

Long-term Debt, Unclassified [Abstract]

DEBT

DEBT

The following table sets forth our consolidated debt for the periods indicated:

	December 31, 2021		December 31, 2020
	(Thousands of dollars)
Commercial paper outstanding	$	—	$	—
Senior unsecured obligations:
$700,000 at 4.25% due February 2022	—		541,877
$900,000 at 3.375% due October 2022	895,814		895,814
$425,000 at 5.0% due September 2023	425,000		425,000
$500,000 at 7.5% due September 2023	500,000		500,000
$500,000 at 2.75% due September 2024	500,000		500,000
$500,000 at 4.9% due March 2025	500,000		500,000
$400,000 at 2.2% due September 2025	387,000		387,000
$600,000 at 5.85% due January 2026	600,000		600,000
$500,000 at 4.0% due July 2027	500,000		500,000
$800,000 at 4.55% due July 2028	800,000		800,000
$100,000 at 6.875% due September 2028	100,000		100,000
$700,000 at 4.35% due March 2029	700,000		700,000
$750,000 at 3.4% due September 2029	714,251		714,251
$850,000 at 3.1% due March 2030	780,093		780,093
$600,000 at 6.35% due January 2031	600,000		600,000
$400,000 at 6.0% due June 2035	400,000		400,000
$600,000 at 6.65% due October 2036	600,000		600,000
$600,000 at 6.85% due October 2037	600,000		600,000
$650,000 at 6.125% due February 2041	650,000		650,000
$400,000 at 6.2% due September 2043	400,000		400,000
$700,000 at 4.95% due July 2047	689,006		689,006
$1,000,000 at 5.2% due July 2048	1,000,000		1,000,000
$750,000 at 4.45% due September 2049	672,530		713,676
$500,000 at 4.5% due March 2050	443,015		451,270
$300,000 at 7.15% due January 2051	300,000		300,000
Guardian Pipeline
Weighted average 7.85% due December 2022	—		13,657
Total debt	13,756,709		14,361,644
Unamortized portion of terminated swaps	11,596		13,314
Unamortized debt issuance costs and discounts	(124,855)		(138,887)
Current maturities of long-term debt	(895,814)		(7,650)
Short-term borrowings (a)	—		—
Long-term debt	$	12,747,636	$	14,228,421

(a) - Individual issuances of commercial paper under our commercial paper program generally mature in 90 days or less.

$2.5 Billion Credit Agreement - Our $2.5 Billion Credit Agreement, which expires in June 2024, is a revolving credit facility and contains certain financial, operational and legal covenants. Among other things, these covenants include maintaining a ratio of indebtedness to adjusted EBITDA (EBITDA, as defined in our $2.5 Billion Credit Agreement, adjusted for all noncash charges and increased for projected EBITDA from certain lender-approved capital expansion projects) of no more than 5.0 to 1 at December 31, 2021.

Our $2.5 Billion Credit Agreement includes a $100 million sublimit for the issuance of standby letters of credit and a $200 million sublimit for swingline loans. Under the terms of our $2.5 Billion Credit Agreement, we may request an increase in the size of the facility to an aggregate of $3.5 billion by either commitments from new lenders or increased commitments from existing lenders. Our $2.5 Billion Credit Agreement contains provisions for an applicable margin rate and an annual facility fee, both of which adjust with changes in our credit ratings. Based on our current credit ratings, borrowings, if any, will accrue at LIBOR, or alternate benchmark rate, plus 110 basis points, and the annual facility fee is 15 basis points. At December 31,

2021, our ratio of indebtedness to adjusted EBITDA was 4.0 to 1, and we were in compliance with all covenants under our $2.5 Billion Credit Agreement.

At December 31, 2021 and 2020, we had letters of credit issued totaling $7.7 million, and no borrowings outstanding under our $2.5 Billion Credit Agreement.

Senior Unsecured Obligations - All notes are senior unsecured obligations, ranking equally in right of payment with all of our existing and future unsecured senior indebtedness, and are structurally subordinate to any of the existing and future debt and other liabilities of any non-guarantor subsidiaries.

Issuances - In May 2020, we completed an underwritten public offering of $1.5 billion senior unsecured notes consisting of $600 million, 5.85% senior notes due 2026; $600 million, 6.35% senior notes due 2031; and $300 million, 7.15% senior notes due 2051. The net proceeds, after deducting underwriting discounts, commissions and offering expenses, were $1.48 billion. A portion of the proceeds was used to repay the outstanding borrowings under our $1.5 Billion Term Loan Agreement. The remainder was used for general corporate purposes.

In March 2020, we completed an underwritten public offering of $1.75 billion senior unsecured notes consisting of $400 million, 2.2% senior notes due 2025; $850 million, 3.1% senior notes due 2030; and $500 million, 4.5% senior notes due 2050. The net proceeds, after deducting underwriting discounts, commissions and offering expenses, were $1.73 billion. A portion of the proceeds was used to pay all outstanding amounts under our commercial paper program. The remainder was used for general corporate purposes, which included repayment of other existing indebtedness and funding capital expenditures.

In August 2019, we completed an underwritten public offering of $2.0 billion senior unsecured notes consisting of $500 million, 2.75% senior notes due 2024; $750 million, 3.4% senior notes due 2029; and $750 million, 4.45% senior notes due 2049. The net proceeds, after deducting underwriting discounts, commissions and offering expenses, were $1.97 billion. The proceeds were used for general corporate purposes, including repayment of existing indebtedness and funding capital expenditures.

In March 2019, we completed an underwritten public offering of $1.25 billion senior unsecured notes consisting of $700 million, 4.35% senior notes due 2029 and an additional issuance of $550 million of our existing 5.2% senior notes due 2048. The net proceeds, after deducting underwriting discounts, commissions and offering expenses, and exclusive of accrued interest, were $1.23 billion. The proceeds were used for general corporate purposes, including repayment of existing indebtedness and funding capital expenditures.

Repayments - In November 2021, we redeemed the remaining $536.1 million of our $700 million, 4.25% senior notes due February 2022 at 100% of the principal amount, plus accrued and unpaid interest, with cash on hand and short-term borrowings.

In June 2021, we repaid the remaining $11.7 million of Guardian Pipeline’s senior notes due December 2022 with cash on hand.

In 2021, we repurchased in the open market outstanding principal of certain of our senior notes in the amount of $55.2 million for an aggregate repurchase price of $54.6 million with cash on hand.

In May 2020, we repaid the remaining $1.25 billion of our $1.5 Billion Term Loan Agreement with cash on hand from our May 2020 public offering of $1.5 billion senior unsecured notes.

In 2020, we repurchased in the open market outstanding principal of certain of our senior notes in the amount of $224.4 million for an aggregate repurchase price of $199.6 million with cash on hand. In connection with these open market repurchases, we recognized $22.3 million of net gains on extinguishment of debt, which is included in other income in our Consolidated Statement of Income for the year ended December 31, 2020.

In September 2019, we redeemed our $300 million, 3.8% senior notes due March 2020 at a redemption price of $308.0 million, including the outstanding principal, plus accrued and unpaid interest, with cash on hand from our public offering of $2.0 billion senior unsecured notes in August 2019. In connection with this early redemption, we incurred a $2.7 million loss on extinguishment of debt, which is included in other expense in our Consolidated Statements of Income for the year ended December 31, 2019.

In August 2019, we repaid $250 million of our $1.5 Billion Term Loan agreement with cash on hand.

In March 2019, we repaid our $500 million, 8.625% senior notes at maturity with a combination of cash on hand and short-term borrowings.

The aggregate maturities of long-term debt outstanding and interest obligations on debt as of December 31, 2021, for the years 2022 through 2026 are shown below:

	Senior Unsecured Obligations		Interest Obligations on Debt		Total
	(Millions of dollars)
2022	$	895.8	$	670.5	$	1,566.3
2023	$	925.0	$	629.3	$	1,554.3
2024	$	500.0	$	584.6	$	1,084.6
2025	$	887.0	$	553.6	$	1,440.6
2026	$	600.0	$	508.8	$	1,108.8

Covenants - Our senior notes are governed by indentures containing covenants, including among other provisions, limitations on our ability to place liens on our property or assets and to sell and leaseback our property. The indentures governing our 6.875% senior notes due 2028 include an event of default upon acceleration of other indebtedness of $15 million or more, and the indentures governing the remainder of our senior notes include an event of default upon the acceleration of other indebtedness of $100 million or more. Such events of default would entitle the trustee or the holders of 25% in aggregate principal amount of the outstanding senior notes to declare those senior notes immediately due and payable in full. The indenture for the 7.5% notes due 2023 also contains a provision that allows the holders of the notes to require ONEOK to offer to repurchase all or any part of their notes if a change of control and a credit rating downgrade occur at a purchase price of 101% of the principal amount, plus accrued and unpaid interest, if any.

We may redeem our senior notes, in whole or in part, at any time prior to their maturity at a redemption price equal to the principal amount, plus accrued and unpaid interest and a make-whole premium. We may redeem the balance of our senior notes due 2022, 2023, 2024, 2025, 2026, 2027, 2028 (4.55%), 2029, 2030, 2031, 2041, 2043, 2047, 2048, 2049, 2050 and 2051 at a redemption price equal to the principal amount, plus accrued and unpaid interest, starting one to six months before the maturity date as stipulated in the respective contract terms. Our senior notes are senior unsecured obligations, ranking equally in right of payment with all of our existing and future unsecured senior indebtedness.

Other - We amortize premiums, discounts and expenses incurred in connection with the issuance of long-term debt consistent with the terms of the respective debt instrument.

Debt Guarantees - ONEOK, ONEOK Partners and the Intermediate Partnership have cross guarantees in place for our and ONEOK Partners’ indebtedness.

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EQUITY (Notes)

12 Months Ended

Dec. 31, 2021

Equity [Abstract]

EQUITY

EQUITY

Series A and B Convertible Preferred Stock - There are no shares of Series A or Series B Preferred Stock currently issued or outstanding.

Equity Issuances - In July 2020, we established an “at-the-market” equity program for the offer and sale from time to time of our common stock up to an aggregate offering price of $1.0 billion. The program allows us to offer and sell common stock at prices we deem appropriate through a sales agent, in forward sales transactions through a forward seller or directly to one or more of the program’s managers acting as principals. Sales of our common stock may be made by means of ordinary brokers’ transactions on the NYSE, in block transactions or as otherwise agreed to between us and the sales agent. We are under no obligation to offer and sell common stock under the program. No shares have been sold through our “at-the-market” program as of the date of this report.

In June 2020, we completed an underwritten public offering of 29.9 million shares of our common stock at a public offering price of $32.00 per share, generating net proceeds, after deducting underwriting discounts, commissions and offering expenses, of $937.0 million. The proceeds were used for general corporate purposes, including repayment of existing indebtedness and funding capital expenditures.

Dividends - Holders of our common stock share equally in any dividend declared by our Board of Directors, subject to the rights of the holders of outstanding Series E Preferred Stock. Dividends paid totaled $1.7 billion, $1.6 billion and $1.5 billion for 2021, 2020 and 2019, respectively. Although dividends per share did not increase in 2021 as compared with 2020, dividends paid increased due to the increase in number of shares outstanding as a result of our equity issuances. The following table sets forth the quarterly dividends per share paid on our common stock in the periods indicated:

	Years Ended December 31,
	2021		2020		2019
First Quarter	$	0.935	$	0.935	$	0.860
Second Quarter	0.935		0.935		0.865
Third Quarter	0.935		0.935		0.890
Fourth Quarter	0.935		0.935		0.915
Total	$	3.74	$	3.74	$	3.53

Additionally, in February 2022, we maintained and paid a quarterly common stock dividend of $0.935 per share ($3.74 per share on an annualized basis), which was paid to shareholders of record as of January 31, 2022.

The Series E Preferred Stock pays quarterly dividends on each share of Series E Preferred Stock, when, as and if declared by our Board of Directors, at a rate of 5.5% per year. We paid dividends for the Series E Preferred Stock of $1.1 million in 2021, 2020 and 2019. We paid quarterly dividends totaling $0.3 million for the Series E Preferred Stock in February 2022.

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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Notes)

12 Months Ended

Dec. 31, 2021

ACCUMULATED OTHER COMPREHENSIVE LOSS

ACCUMULATED OTHER COMPREHENSIVE LOSS

The following table sets forth the balance in accumulated other comprehensive loss for the periods indicated:

	Risk- Management Assets/Liabilities (a)		Retirement and Other Postretirement Benefit Plan Obligations (a) (b)		Risk- Management Assets/Liabilities of Unconsolidated Affiliates (a)		Accumulated Other Comprehensive Loss (a)
	(Thousands of dollars)
January 1, 2020	$	(233,520)	$	(131,481)	$	(8,999)	$	(374,000)
Other comprehensive loss before reclassifications	(165,023)		(40,341)		(8,635)		(213,999)
Amounts reclassified to net income (c)	21,097		14,187		1,266		36,550
Other comprehensive loss	(143,926)		(26,154)		(7,369)		(177,449)
December 31, 2020	(377,446)		(157,635)		(16,368)		(551,449)
Other comprehensive income (loss) before reclassifications	(203,868)		31,897		3,088		(168,883)
Amounts reclassified to net income (c)	228,999		18,079		1,903		248,981
Other comprehensive income	25,131		49,976		4,991		80,098
December 31, 2021	$	(352,315)	$	(107,659)	$	(11,377)	$	(471,351)

(a) - All amounts are presented net of tax.

(b) - Includes amounts related to supplemental executive retirement plan.

(c) - See Note C for details of amounts reclassified to net income for risk-management assets/liabilities and Note K for retirement and other postretirement benefit plan obligations.

The following table sets forth information about the balance of accumulated other comprehensive loss at December 31, 2021, representing unrealized losses related to risk-management assets and liabilities:

	Risk- Management Assets/Liabilities (a)
	(Thousands of dollars)
Commodity derivative instruments expected to be realized within the next 36 months (b)	$	(76,942)
Settled interest-rate swaps to be recognized over the life of the long-term, fixed-rate debt (c)	(163,320)
Interest-rate swaps with future settlement dates expected to be amortized over the life of long-term debt	(112,053)
Accumulated other comprehensive loss at December 31, 2021	$	(352,315)

(a) - All amounts are presented net of tax.

(b) - Based on commodity prices on December 31, 2021, we expect net losses of $76.8 million, net of tax, will be reclassified into earnings during the next 12 months.

(c) - We expect net losses of $27.1 million, net of tax, will be reclassified into earnings during the next 12 months.

The remaining amounts in accumulated other comprehensive loss relate primarily to our retirement and other postretirement benefit plan obligations, which are expected to be amortized over the average remaining service period of employees participating in these plans.

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EARNINGS PER SHARE EARNINGS PER SHARE (Notes)

12 Months Ended

Dec. 31, 2021

Earnings Per Share [Abstract]

Earnings Per Share [Text Block]

EARNINGS PER SHARE

The following tables set forth the computation of basic and diluted EPS for the periods indicated:

	Year Ended December 31, 2021
	Income		Shares	Per Share Amount
	(Thousands, except per share amounts)
Basic EPS
Net income available for common stock	$	1,498,606	446,403	$	3.36
Diluted EPS
Effect of dilutive securities	—		1,000
Net income available for common stock and common stock equivalents	$	1,498,606	447,403	$	3.35

	Year Ended December 31, 2020
	Income		Shares	Per Share Amount
	(Thousands, except per share amounts)
Basic EPS
Net income available for common stock	$	611,709	431,105	$	1.42
Diluted EPS
Effect of dilutive securities	—		677
Net income available for common stock and common stock equivalents	$	611,709	431,782	$	1.42

	Year Ended December 31, 2019
	Income		Shares	Per Share Amount
	(Thousands, except per share amounts)
Basic EPS
Net income available for common stock	$	1,277,477	413,560	$	3.09
Diluted EPS
Effect of dilutive securities	—		1,884
Net income available for common stock and common stock equivalents	$	1,277,477	415,444	$	3.07

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SHARE-BASED PAYMENTS SHARE-BASED PAYMENTS (Notes)

12 Months Ended

Dec. 31, 2021

Share-based Payment Arrangement [Abstract]

SHARE-BASED PAYMENTS

SHARE-BASED PAYMENTSOur Equity Incentive Plan (EIP) provides for the granting of stock-based compensation, including restricted stock unit awards and performance unit awards, to eligible employees and the granting of stock awards to non-employee directors. We have

reserved 8.5 million shares of common stock for issuance under the EIP and at December 31, 2021, we had 5.5 million shares available for issuance under the plan. This calculation of available shares reflects shares issued and estimated shares expected to be issued upon vesting of outstanding awards granted under the EIP, excluding estimated forfeitures expected to be returned to the plan.

Restricted Stock Units - We have granted restricted stock units to key employees that vest at the end of a three-year period and entitle the grantee to receive shares of our common stock. Restricted stock unit awards are measured at fair value as if they were vested and issued on the grant date and adjusted for estimated forfeitures. Restricted stock unit awards accrue dividend equivalents in the form of additional restricted stock units prior to vesting. Compensation expense is recognized on a straight-line basis over the vesting period of the award.

Performance Unit Awards - We have granted performance unit awards to key employees that vest at the end of a three-year period. Upon vesting, a holder of outstanding performance units is entitled to receive a number of shares of our common stock equal to a percentage (0% to 200%) of the performance units granted, based on our total shareholder return over the vesting period, compared with the total shareholder return of a peer group of other energy companies over the same period. Performance unit awards are measured at fair value on the grant date based on a Monte Carlo model and adjusted for estimated forfeitures. Performance unit awards accrue dividend equivalents in the form of additional performance units prior to vesting. Compensation expense is recognized on a straight-line basis over the vesting period of the award.

Stock Compensation for Non-Employee Directors

The EIP provides for the granting of nonstatutory stock options and stock bonus awards to non-employee directors, including performance unit awards and restricted stock unit awards. Under the EIP, awards may be granted by the Executive Compensation Committee at any time, until grants have been made for all shares authorized under the EIP. The maximum number of shares of common stock and cash-based awards that can be issued to a participant under the EIP during any year is limited to $0.8 million in value as of the grant date. No performance unit awards or restricted stock unit awards have been made to non-employee directors, and there are no options outstanding.

General

For all awards outstanding, we used a 3% forfeiture rate based on historical forfeitures under our share-based payment plans. We currently use treasury stock to satisfy our share-based payment obligations.

Compensation expense for our share-based payment plans was $54.1 million, $29.4 million and $46.5 million during 2021, 2020 and 2019, respectively, before related tax benefits of $14.4 million, $14.1 million and $31.7 million, respectively.

Restricted Stock Unit Activity

As of December 31, 2021, we had $19.3 million of total unrecognized compensation cost related to our nonvested restricted stock unit awards, which is expected to be recognized over a weighted-average period of 1.8 years. The following tables set forth activity and various statistics for our restricted stock unit awards:

	Number of Units	Weighted Average Price
Nonvested December 31, 2020	646,287	$	63.85
Granted	417,212	$	46.84
Released to participants	(242,765)	$	51.57
Forfeited	(40,797)	$	55.27
Nonvested December 31, 2021	779,937	$	59.02

	2021		2020		2019
Weighted-average grant date fair value (per share)	$	46.84	$	76.49	$	58.07
Fair value of units granted (thousands of dollars)	$	19,542	$	16,552	$	15,238
Grant date fair value of units vested (thousands of dollars)	$	12,519	$	11,204	$	10,691

Performance Unit Activity

As of December 31, 2021, we had $31.7 million of total unrecognized compensation cost related to the nonvested performance unit awards, which is expected to be recognized over a weighted-average period of 1.8 years. The following tables set forth activity and various statistics related to the performance unit awards and the assumptions used in the valuations at the respective grant dates:

	Number of Units	Weighted Average Price
Nonvested December 31, 2020	834,246	$	75.96
Granted	542,183	$	62.03
Released to participants	(311,907)	$	64.00
Forfeited	(87,937)	$	68.37
Nonvested December 31, 2021	976,585	$	72.73

	2021	2020	2019
Volatility (a)	60.30%	21.70%	27.10%
Dividend yield	8.13%	4.87%	5.05%
Risk-free interest rate	0.21%	1.39%	2.47%

(a) - Volatility was based on historical volatility over three years using daily stock price observations.

	2021		2020		2019
Weighted-average grant date fair value (per share)	$	62.03	$	88.43	$	68.02
Fair value of units granted (thousands of dollars)	$	33,632	$	25,028	$	23,020
Grant date fair value of units vested (thousands of dollars)	$	19,962	$	17,722	$	15,018

Employee Stock Purchase Plan

We have reserved a total of 11.6 million shares of common stock for issuance under our Employee Stock Purchase Plan (the ESPP). Subject to certain exclusions, all employees are eligible to participate in the ESPP. Employees can choose to have up to 10% of their base pay withheld from each paycheck during the offering period to purchase our common stock, subject to terms and limitations of the plan. The purchase price of the stock is 85% of the lower of its grant date or exercise date market price. Approximately 69%, 68% and 62% of employees participated in the plan in 2021, 2020 and 2019, respectively. Under the plan, we sold 277,012 shares at a weighted average of $38.98 per share in 2021, 359,977 shares at a weighted average of $27.78 per share in 2020 and 171,590 shares at a weighted average of $51.24 per share in 2019.

Employee Stock Award Program

Under our Employee Stock Award Program, we issue, for no monetary consideration, to all eligible employees one share of our common stock when the per-share closing price of our common stock on the NYSE is at or above each one-dollar increment above its previous high closing price. The total number of shares of our common stock available for issuance under this program is 900,000. Shares issued to employees under this program during 2020 and 2019 totaled 2,871 and 14,022, respectively. Compensation expense related to the Employee Stock Award Program was $0.2 million and $1.0 million for 2020 and 2019, respectively. No shares were issued to employees under this program in 2021. As of the date of this report, the next award will be issued when our common stock closes at or above $78.

Deferred Compensation Plan for Non-Employee Directors

Our Deferred Compensation Plan for Non-Employee Directors provides our non-employee directors the option to defer all or a portion of their compensation for their service on our Board of Directors. Under the plan, directors may elect either a cash deferral option or a phantom stock option. Under the cash deferral option, directors may elect to defer the receipt of all or a portion of their annual retainer fees, which will be credited with interest during the deferral period. Under the phantom stock option, directors may defer all or a portion of their annual retainer fees and receive such fees on a deferred basis in the form of shares of common stock under our EIP, which earn the equivalent of dividends declared on our common stock. Shares are distributed to non-employee directors at the fair market value of our common stock at the date of distribution.

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EMPLOYEE BENEFIT PLANS EMPLOYEE BENEFIT PLANS (Notes)

12 Months Ended

Dec. 31, 2021

Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]

Compensation and Employee Benefit Plans

EMPLOYEE BENEFIT PLANS

Retirement and Other Postretirement Benefit Plans

Retirement Plans - We have a defined benefit pension plan covering certain employees and former employees, which closed to new participants in 2005. In addition, we have a supplemental executive retirement plan for the benefit of certain officers who participate in our defined benefit pension plan. Our supplemental executive retirement plan is closed to new participants. We fund our defined benefit pension plan at a level needed to maintain or exceed the minimum funding levels required by the Employee Retirement Income Security Act of 1974, as amended.

All employees are eligible to make salary deferrals and receive company matching contributions under our 401(k) Plan, and employees that do not participate in our defined benefit pension plan are also eligible to receive quarterly and annual profit-sharing contributions under our 401(k) Plan.

Other Postretirement Benefit Plans - We sponsor health and welfare plans that provide postretirement medical and life insurance benefits to employees hired prior to 2017 who retire with at least five years of full-time consecutive service. The postretirement medical plan for pre-Medicare participants is contributory, with retiree contributions adjusted periodically, and contains other cost-sharing features such as deductibles and coinsurance. The postretirement medical plan for Medicare-eligible participants is an account-based plan under which participants may elect to purchase private insurance policies under a private exchange and/or seek reimbursement of other eligible medical expenses.

Obligations and Funded Status - The following table sets forth our retirement and other postretirement benefit plans benefit obligations and fair value of plan assets for the periods indicated:

	Retirement Benefits				Other Postretirement Benefits
	December 31,				December 31,
	2021		2020		2021		2020
Change in benefit obligation	(Thousands of dollars)
Benefit obligation, beginning of period	$	583,072	$	534,849	$	54,515	$	52,309
Service cost	8,314		8,154		421		460
Interest cost	16,900		18,318		1,454		1,771
Plan participants’ contributions	—		—		1,092		1,032
Actuarial loss (gain)	(22,792)		37,951		(2,496)		2,860
Benefits paid	(18,483)		(16,200)		(3,959)		(3,917)
Benefit obligation, end of period (b)	567,011		583,072		51,027		54,515
Change in plan assets
Fair value of plan assets, beginning of period	379,092		346,792		20,874		39,060
Actual return on plan assets (a)	41,374		36,400		5,919		(15,699)
Employer contributions	11,200		12,100		—		—
Plan participants’ contributions	—		—		1,092		1,032
Benefits paid	(18,483)		(16,200)		(3,488)		(3,519)
Fair value of plan assets, end of period (c)	413,183		379,092		24,397		20,874
Balance at December 31	$	(153,828)	$	(203,980)	$	(26,630)	$	(33,641)
Current liabilities	$	(5,219)	$	(4,679)	$	—	$	—
Noncurrent liabilities	(148,609)		(199,301)		(26,630)		(33,641)
Balance at December 31	$	(153,828)	$	(203,980)	$	(26,630)	$	(33,641)

(a) - Other Postretirement Benefits for the year ended December 31, 2020, includes a $13.2 million tax loss incurred from the exit of an investment in an insurance contract.

(b) - The benefit obligation for Retirement Benefits at December 31, 2021 and 2020, include the supplemental executive retirement plan obligation.

(c) - Fair value of plan assets for Retirement Benefits exclude the assets of our supplemental executive retirement plan, which totaled $111.2 million and $116.2 million at December 31, 2021 and 2020, respectively, and are included in other assets on the Consolidated Balance Sheets. These assets are maintained in a rabbi trust and are not treated as assets of the supplemental executive retirement plan.

The accumulated benefit obligation for our retirement plans was $541.8 million and $548.2 million at December 31, 2021 and 2020, respectively.

The actuarial gains and losses impacting our benefit obligations for our retirement and other postretirement benefit plans are due primarily to changes in the discount rate assumptions discussed in the “Actuarial Assumptions” section below.

Components of Net Periodic Benefit Cost - The following table sets forth the components of net periodic benefit cost for our retirement and other postretirement benefit plans for the periods indicated:

	Retirement Benefits						Other Postretirement Benefits
	Years Ended December 31,						Years Ended December 31,
	2021		2020		2019		2021		2020		2019
	(Thousands of dollars)
Components of net periodic benefit cost
Service cost	$	8,314	$	8,154	$	7,825	$	421	$	460	$	468
Interest cost	16,900		18,318		20,528		1,454		1,771		2,038
Expected return on plan assets	(25,109)		(24,964)		(23,600)		(1,364)		(2,894)		(2,285)
Amortization of prior service cost (credit)	114		114		—		—		—		(227)
Amortization of net loss	19,673		18,306		12,649		3,692		5		297
Net periodic benefit cost (income)	$	19,892	$	19,928	$	17,402	$	4,203	$	(658)	$	291

Other Comprehensive Income (Loss) - The following table sets forth the amounts recognized in other comprehensive income (loss) related to our retirement and other postretirement benefits for the periods indicated:

	Retirement Benefits						Other Postretirement Benefits
	Years Ended December 31,						Years Ended December 31,
	2021		2020		2019		2021		2020		2019
	(Thousands of dollars)
Net gain (loss) (a)	$	34,529	$	(31,016)	$	(25,389)	$	7,052	$	(21,453)	$	700
Prior service cost	—		—		(601)		—		—		—
Amortization of prior service cost (credit) (b)	114		114		—		—		—		(227)
Amortization of net loss (b)	19,673		18,306		12,649		3,692		5		297
Deferred income taxes	(12,493)		2,897		3,068		(2,471)		4,933		(177)
Total recognized in other comprehensive income (loss)	$	41,823	$	(9,699)	$	(10,273)	$	8,273	$	(16,515)	$	593

(a) - Other Postretirement Benefits for the year ended December 31, 2020, includes a $13.2 million tax loss incurred from the exit of an investment in an insurance contract.

(b) - These components are recognized in accumulated other comprehensive loss and are reclassified to other expense in our Consolidated Statements of Income, with related income tax benefits of $5.4 million, $4.2 million and $2.9 million reclassified to income tax expense for the years ended December 31, 2021, 2020 and 2019, respectively.

The table below sets forth the amounts in accumulated other comprehensive loss that had not yet been recognized as components of net periodic benefit expense for the periods indicated:

	Retirement Benefits				Other Postretirement Benefits
	December 31,				December 31,
	2021		2020		2021		2020
	(Thousands of dollars)
Prior service cost	$	(374)	$	(487)	$	—	$	—
Accumulated loss (a)	(131,460)		(185,662)		(14,815)		(25,558)
Accumulated other comprehensive loss	(131,834)		(186,149)		(14,815)		(25,558)
Deferred income taxes	36,759		49,251		3,852		6,322
Accumulated other comprehensive loss, net of tax	$	(95,075)	$	(136,898)	$	(10,963)	$	(19,236)

(a) - Other Postretirement Benefits for the year ended December 31, 2020, includes a $13.2 million tax loss incurred from the exit of an investment in an insurance contract.

Actuarial Assumptions - The following table sets forth the weighted-average assumptions used to determine benefit obligations for retirement and other postretirement benefits for the periods indicated:

	Retirement Benefits		Other Postretirement Benefits
	December 31,		December 31,
	2021	2020	2021	2020
Discount rate	3.25%	3.00%	3.00%	2.75%
Compensation increase rate	3.60%	3.60%	NA	NA

The following table sets forth the weighted-average assumptions used to determine net periodic benefit costs for the periods indicated:

	Years Ended December 31,
	2021	2020	2019
Discount rate - retirement plans	3.00%	3.50%	4.50%
Discount rate - other postretirement plans	2.75%	3.50%	4.50%
Expected long-term return on plan assets	7.00%	7.50%	7.50%
Compensation increase rate	3.60%	3.70%	3.65%

We determine our overall expected long-term rate of return on plan assets based on our review of historical returns and economic growth models.

We determine our discount rates annually utilizing portfolios of high-quality bonds matched to the estimated benefit cash flows of our retirement and other postretirement benefit plans. Bonds selected to be included in the portfolios are only those rated by S&P or Moody’s as an AA or Aa2 rating or better and exclude callable bonds, bonds with less than a minimum issue size, yield outliers and other filtering criteria to remove unsuitable bonds.

Health Care Cost Trend Rates - The following table sets forth the assumed health care cost-trend rates for the periods indicated:

	2021	2020
Health care cost-trend rate assumed for next year	6.50%	6.50%
Rate to which the cost-trend rate is assumed to decline (the ultimate trend rate)	5.00%	5.00%
Year that the rate reaches the ultimate trend rate	2025	2024

Plan Assets - Our investment strategy is to invest plan assets in accordance with sound investment practices that emphasize long-term fundamentals. The goal of this strategy is to maximize investment returns while managing risk in order to meet the plan’s current and projected financial obligations. The investment allocation for our other postretirement benefit plans is to target a diversified mix of approximately 30% fixed income and 70% equity securities. The investment allocation for our defined benefit pension plan follows a glide path approach of liability-driven investing that shifts a higher portfolio weighting to fixed income as the plan’s funded status increases. The purpose of liability-driven investing is to structure the asset portfolio to more closely resemble the pension liability and thereby more effectively hedge against changes in the liability. The plan’s current investments include a diverse blend of various domestic and international equities, investments in various classes of debt securities, real estate and hedge funds. The target allocation for the assets of our retirement plan as of December 31, 2021, is as follows:

Domestic and international equities	42	%
Long duration fixed income	30	%
Return-seeking credit	11	%
Hedge funds	10	%
Real estate funds	7	%
Total	100	%

As part of our risk management for the plans, minimums and maximums have been set for each of the asset classes listed above.

The following tables set forth the plan assets by fair value category as of the measurement date for our defined benefit pension and other postretirement benefit plans:

	Pension Benefits
	December 31, 2021
Asset Category	Level 1		Level 2		Level 3		Subtotal		Measured at NAV (d)		Total
	(Thousands of dollars)
Investments:
Equity securities	$	42	$	—	$	—	$	42	$	—	$	42
Common/collective trusts
Equity securities (a)	—		—		—		—		166,132		166,132
Real estate funds	—		—		—		—		30,491		30,491
Government obligations	—		—		—		—		49,444		49,444
Corporate obligations (b)	—		—		—		—		120,877		120,877
Short-term investments	—		—		—		—		4,243		4,243
Other investments (c)	—		—		—		—		41,954		41,954
Fair value of plan assets	$	42	$	—	$	—	$	42	$	413,141	$	413,183

(a) - This category represents securities of the respective market sector from diverse industries.

(b) - This category represents bonds from diverse industries.

(c) - This category represents alternative investments in limited partnerships, which can be redeemed with a 30-day notice with no further restrictions. There are no unfunded capital commitments. These limited partnerships invest through multi-strategy programs in broadly diversified portfolios of private investment funds, hedge funds and/or separate accounts to seek equity-like returns with low market correlation, reduced volatility and limited risk.

(d) - Plan asset investments measured at fair value using the net asset value per share.

	Pension Benefits
	December 31, 2020
Asset Category	Level 1		Level 2		Level 3		Subtotal		Measured at NAV (d)		Total
	(Thousands of dollars)
Investments:
Equity securities	$	43	$	—	$	—	$	43	$	—	$	43
Common/collective trusts
Equity securities (a)	—		—		—		—		164,099		164,099
Real estate funds	—		—		—		—		24,134		24,134
Government obligations	—		—		—		—		45,237		45,237
Corporate obligations (b)	—		—		—		—		101,626		101,626
Short-term investments (e)	—		—		—		—		4,890		4,890
Other investments (c)	—		—		—		—		39,063		39,063
Fair value of plan assets	$	43	$	—	$	—	$	43	$	379,049	$	379,092

(a) - This category represents securities of the respective market sector from diverse industries.

(b) - This category represents bonds from diverse industries.

(c) - This category represents alternative investments in limited partnerships, which can be redeemed with a 30-day notice with no further restrictions. There are no unfunded capital commitments. These limited partnerships invest through multi-strategy programs in broadly diversified portfolios of private investment funds, hedge funds and/or separate accounts to seek equity-like returns with low market correlation, reduced volatility and limited risk.

(d) - Plan asset investments measured at fair value using the net asset value per share.

(e) - The fair value of short term investments in the Bank of New York Mellon EB Temporary Investment Fund was previously reported in Level 2. We elected to consistently apply the practical expedient to all investments within common/collective trusts, and therefore, the fair value of this fund is now measured at net asset value per share and no longer classified in the fair value hierarchy.

	Other Postretirement Benefits
	December 31, 2021
Asset Category	Level 1		Level 2		Level 3		Total
	(Thousands of dollars)
Investments:
Equity securities (a)	$	17,953	$	—	$	—	$	17,953
Money market funds	—		480		—		480
Municipal obligations	5,964		—		—		5,964
Fair value of plan assets	$	23,917	$	480	$	—	$	24,397

(a) - This category represents securities of the respective market sector from diverse industries.

	Other Postretirement Benefits
	December 31, 2020
Asset Category	Level 1		Level 2		Level 3		Total
	(Thousands of dollars)
Investments:
Equity securities (a)(b)	$	15,116	$	—	$	—	$	15,116
Money market funds	—		808		—		808
Municipal obligations (b)	4,950		—		—		4,950
Fair value of plan assets	$	20,066	$	808	$	—	$	20,874

(a) - This category represents securities of the respective market sector from diverse industries.

(b) - Net proceeds of $16.2 million from the exit of an investment in an insurance contract were reinvested in various equity securities and municipal obligations.

Contributions - During 2021, we made $11.2 million in contributions to our defined benefit pension plan and no contributions to our other postretirement plans. Our defined benefit pension plan elected to adopt funding relief provided by the American Rescue Plan Act of 2021 legislation. As a result of the election, our defined benefit pension plan has no minimum required contribution in 2022.

Pension and Other Postretirement Benefit Payments - Benefit payments for our defined benefit pension and other postretirement benefit plans for the period ending December 31, 2021, were $18.5 million and $4.0 million, respectively. The following table sets forth the defined benefit pension and other postretirement benefits payments expected to be paid in 2022 through 2031:

	Pension Benefits		Other Postretirement Benefits
Benefits to be paid in:	(Thousands of dollars)
2022	$	25,962	$	3,387
2023	$	26,756	$	3,363
2024	$	27,769	$	3,302
2025	$	28,759	$	3,293
2026	$	29,651	$	3,220
2027 through 2031	$	156,041	$	15,339

The expected benefits to be paid are based on the same assumptions used to measure our benefit obligation at December 31, 2021, and include estimated future employee service.

Other Employee Benefit Plans

401(k) Plan - We have a 401(k) Plan covering all employees, and employee contributions are discretionary. We match 100% of employee 401(k) Plan contributions up to 6% of each participant’s eligible compensation each payroll period, subject to certain limits. We also make profit-sharing contributions under our 401(k) Plan for employees who do not participate in our defined benefit pension plan. We generally make a quarterly profit sharing contribution equal to 1% of each profit-sharing participant’s eligible compensation during the quarter and an annual discretionary profit-sharing contribution equal to a percentage of each profit-sharing participant’s eligible compensation. Our contributions made to the plan, including profit-sharing contributions, were $32.7 million, $27.1 million and $30.4 million in 2021, 2020 and 2019, respectively.

Nonqualified Deferred Compensation Plan - The 2020 Nonqualified Deferred Compensation Plan and its predecessor nonqualified deferred compensation plans (collectively, the NQDC Plan) provide a select group of management and highly compensated employees, as approved by our Chief Executive Officer, with the option to defer portions of their compensation and receive notional employer contributions that generally are not available due to limitations on employer and employee contributions to qualified defined contribution plans under federal tax laws. We have investments included in other assets on the Consolidated Balance Sheets related to the NQDC Plan, which totaled $36.1 million and $32.4 million at December 31, 2021 and 2020, respectively. These investments are maintained in a rabbi trust. Our contributions to the plan were not material in 2021, 2020 and 2019.

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INCOME TAXES (Notes)

12 Months Ended

Dec. 31, 2021

Income Tax Disclosure [Abstract]

INCOME TAXES

INCOME TAXES

The following table sets forth our provision for income taxes for the periods indicated:

	Years Ended December 31,
	2021		2020		2019
	(Thousands of dollars)
Current tax expense (benefit)
Federal	$	2,897	$	980	$	(1,278)
State	9,544		1,797		963
Total current tax expense (benefit)	12,441		2,777		(315)
Deferred tax expense
Federal	433,469		154,068		327,806
State	38,588		32,662		44,923
Total deferred tax expense	472,057		186,730		372,729
Total provision for income taxes	$	484,498	$	189,507	$	372,414

The following table is a reconciliation of our income tax provision for the periods indicated:

	Years Ended December 31,
	2021			2020			2019
	(Thousands of dollars)
Income before income taxes	$	1,984,204		$	802,316		$	1,650,991
Federal statutory income tax rate	21.0		%	21.0		%	21.0		%
Provision for federal income taxes	416,683			168,486			346,708
State income taxes, net of federal benefit	40,092			13,580			34,545
Deferred tax rate change, inclusive of valuation allowance	6,350			20,879			11,340
Excess tax benefits from share-based compensation	(1,968)			(7,380)			(20,983)
Other, net (a)	23,341			(6,058)			804
Income tax provision	$	484,498		$	189,507		$	372,414

(a) The year ended December 31, 2021, includes $19.4 million impact from previously recognized gains on certain benefit plan investments.

The following table sets forth the tax effects of temporary differences that gave rise to significant portions of the deferred tax assets and liabilities for the periods indicated:

	December 31, 2021		December 31, 2020
Deferred tax assets	(Thousands of dollars)
Employee benefits and other accrued liabilities	$	95,952	$	96,741
Federal net operating loss	1,337,050		1,473,093
State net operating loss and benefits	216,181		258,929
Derivative instruments	118,063		134,499
Other	4,863		12,894
Total deferred tax assets	1,772,109		1,976,156
Valuation allowance for state net operating loss and tax credits
Carryforward expected to expire prior to utilization	(84,755)		(121,212)
Net deferred tax assets	1,687,354		1,854,944
Deferred tax liabilities
Excess of tax over book depreciation	84,692		87,021
Investment in partnerships (a)	2,769,352		2,437,620
Total deferred tax liabilities	2,854,044		2,524,641
Net deferred tax assets (liabilities)	$	(1,166,690)	$	(669,697)

(a) Due primarily to excess of tax over book depreciation.

As of December 31, 2021, we have federal net operating loss carryforwards of $6.4 billion, the majority of which have an indefinite carry forward period. We expect to generate taxable income and utilize these net operating loss carryforwards in future periods. We also have loss and credit carryovers in multiple states, $2.8 billion of which have an indefinite carry forward period and $1.9 billion of which will expire between 2022 and 2038. We have deferred tax assets related to federal and state net operating loss and credit carryforwards of $1.6 billion and $1.7 billion in 2021 and 2020, respectively. We believe that it is more likely than not that the tax benefits of certain state carryforwards will not be utilized; therefore, we recorded a valuation allowance of $6.4 million, $20.9 million and $11.3 million through net income related to these tax benefits in 2021, 2020 and 2019, respectively.

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UNCONSOLIDATED AFFILIATES (Notes)

12 Months Ended

Dec. 31, 2021

Equity Method Investments and Joint Ventures [Abstract]

UNCONSOLIDATED AFFILIATES

UNCONSOLIDATED AFFILIATES

Investments in Unconsolidated Affiliates - The following table sets forth our investments in unconsolidated affiliates for the periods indicated:

	Net Ownership Interest	December 31, 2021		December 31, 2020
		(Thousands of dollars)
Northern Border Pipeline	50%	$	283,170	$	291,987
Overland Pass Pipeline	50%	403,011		409,573
Roadrunner	50%	70,777		66,794
Other (a)	Various	40,655		36,678
Investments in unconsolidated affiliates (b)		$	797,613	$	805,032

(a) - Year ended December 31, 2020, includes the impact of noncash impairment charges of $37.7 million related to the equity investments discussed below, offset partially by an acquisition of an additional equity interest for $20.0 million.

(b) - Equity-method goodwill (Note A) was $16.5 million at December 31, 2021 and 2020.

Equity in Net Earnings from Investments and Impairments - The following table sets forth our equity in net earnings (loss) from investments for the periods indicated:

	Years Ended December 31,
	2021		2020		2019
	(Thousands of dollars)
Northern Border Pipeline	$	64,470	$	75,409	$	68,871
Overland Pass Pipeline	19,434		38,618		63,698
Roadrunner	33,293		29,017		26,839
Other	5,323		197		(4,867)
Equity in net earnings from investments	$	122,520	$	143,241	$	154,541
Impairment of equity investments	$	—	$	(37,730)	$	—

Impairment Charges - In 2020, we incurred a noncash impairment charge of $30.5 million related to our 10.2% investment in Venice Energy Services Company in our Natural Gas Gathering and Processing segment, which includes $22.3 million related to equity-method goodwill, and a $7.2 million noncash impairment charge related to our 50% investment in Chisholm Pipeline Company in our Natural Gas Liquids segment. These impairment charges are included within impairment of equity investments in our Consolidated Statement of Income for the year ended December 31, 2020.

We incurred expenses in transactions with unconsolidated affiliates of $62.8 million, $135.4 million and $164.7 million for 2021, 2020 and 2019, respectively, primarily related to Overland Pass Pipeline and Northern Border Pipeline. Revenue earned and accounts receivable from, and accounts payable to, our equity-method investees were not material.

Northern Border Pipeline - The Northern Border Pipeline partnership agreement provides that distributions to Northern Border Pipeline’s partners are to be made on a pro rata basis according to each partner’s ownership percentage interest. The Northern Border Pipeline Management Committee determines the amount and timing of such distributions. Any changes to, or suspension of, the cash distribution policy of Northern Border Pipeline requires the unanimous approval of the Northern Border Pipeline Management Committee. Cash distributions are equal to 100% of distributable cash flow as determined from Northern Border Pipeline’s financial statements based upon EBITDA less interest expense and maintenance capital expenditures. As determined by the Northern Border Pipeline Management Committee, we received an additional distribution of $50.0 million from Northern Border Pipeline during the year ended December 31, 2019. Loans or other advances from Northern Border Pipeline to its partners or affiliates are prohibited under its credit agreement. In all periods presented, we made no contributions to Northern Border Pipeline.

Overland Pass Pipeline - The Overland Pass Pipeline agreement provides that distributions to Overland Pass Pipeline’s members are to be made on a pro rata basis according to each member’s ownership percentage interest. The Overland Pass Pipeline Company Management Committee determines the amount and timing of such distributions. Any changes to, or suspension of, the cash distributions from Overland Pass Pipeline requires the unanimous approval of the Overland Pass Pipeline Company Management Committee. Cash distributions are equal to 100% of available cash as defined in the limited liability company agreement. In all periods presented, our contributions to Overland Pass Pipeline were not material.

Roadrunner - The Roadrunner agreement provides that distributions to members are made on a pro rata basis according to each member’s ownership interest. As the operator, we have been delegated the authority to determine such distributions in accordance with, and on the frequency set forth in, the Roadrunner agreement. Cash distributions are equal to 100% of available cash, as defined in the limited liability company agreement. In all periods presented, our contributions to Roadrunner were not material.

We have an operating agreement with Roadrunner that provides for reimbursement or payment to us for management services and certain operating costs. Reimbursements and payments from Roadrunner included in operating income in our Consolidated Statements of Income for all periods presented were not material.

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COMMITMENTS AND CONTINGENCIES (Notes)

12 Months Ended

Dec. 31, 2021

Commitments and Contingencies Disclosure [Abstract]

COMMITMENTS AND CONTINGENCIES

COMMITMENTS AND CONTINGENCIES

Commitments - Firm transportation and storage contracts are fixed-price contracts that provide us with firm transportation and storage capacity. The following table sets forth our firm transportation and storage contract payments for the periods indicated:

	Firm Transportation and Storage Contracts
	(Millions of dollars)
2022	$	72.3
2023	63.1
2024	59.3
2025	53.9
2026	40.8
Thereafter	211.6
Total	$	501.0

Environmental Matters and Pipeline Safety - The operation of pipelines, plants and other facilities for the gathering, processing, fractionation, transportation and storage of natural gas, NGLs, condensate and other products is subject to numerous and complex laws and regulations pertaining to health, safety and the environment. As an owner and/or operator of these facilities, we must comply with laws and regulations that relate to air and water quality, hazardous and solid waste management and disposal, cultural resource protection and other environmental and safety matters. The cost of planning, designing, constructing and operating pipelines, plants and other facilities must incorporate compliance with these laws, regulations and safety standards. Failure to comply with these laws and regulations may trigger a variety of administrative, civil and potentially criminal enforcement measures, including citizen suits, which can include the assessment of monetary penalties, the imposition of remedial requirements and the issuance of injunctions or restrictions on operation or construction. Management does not believe that, based on currently known information, a material risk of noncompliance with these laws and regulations exists that will affect adversely our consolidated results of operations, financial condition or cash flows.

Legal Proceedings - We are a party to various legal proceedings that have arisen in the normal course of our operations. While the results of these proceedings cannot be predicted with certainty, we believe the reasonably possible losses from such proceedings, individually and in the aggregate, are not material. Additionally, we believe the probable final outcome of such proceedings will not have a material adverse effect on our consolidated results of operations, financial position or cash flows.

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LEASES (Notes)

12 Months Ended

Dec. 31, 2021

Leases [Abstract]

Leases of Lessee Disclosure [Text Block]

LEASES

We lease certain buildings, warehouses, office space, pipeline capacity, land and equipment, including pipeline equipment, rail cars and information technology equipment. Our lease payments are generally straight-line and the exercise of lease renewal options, which vary in term, is at our sole discretion. We include renewal periods in a lease term if we are reasonably certain to exercise available renewal options. We apply the short-term policy election, which allows us to exclude from recognition leases with an initial term of 12 months or less. Our lease agreements do not include any residual value guarantees or material restrictive covenants.

Through ONEOK Leasing Company, L.L.C. and ONEOK Parking Company, L.L.C., we own an office building and a parking garage and lease excess space in these facilities to affiliates and others. Our consolidated lease income is not material.

The following table sets forth information about our lease assets and liabilities included in our Consolidated Balance Sheet for the periods indicated:

Leases	Location in our Consolidated Balance Sheet	December 31, 2021		December 31, 2020
		(Thousands of dollars)
Assets
Operating leases	Other assets	$	89,558	$	100,154
Finance lease	Property, plant and equipment	29,962		28,286
Finance lease	Accumulated depreciation	(3,590)		(2,451)
Total leased assets		$	115,930	$	125,989
Liabilities
Current
Operating leases	Operating lease liability	$	13,783	$	13,610
Finance lease	Other current liabilities	2,584		2,153
Noncurrent
Operating leases	Operating lease liability	75,636		87,610
Finance lease	Other deferred credits	21,082		22,143
Total lease liabilities		$	113,085	$	125,516

The following table sets forth supplemental cash flow information related to our leases:

	Years Ended December 31,
	2021		2020
	(Thousands of dollars)
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows for operating leases	$	15,690	$	13,245
Financing cash flows for finance lease	$	2,307	$	1,949
Right-of-use assets obtained in exchange for operating lease liabilities (noncash) (a)	$	1,150	$	99,547

(a) - In December 2019, we entered into an operating lease for pipeline capacity with a lease term of 10 years that commenced January 1, 2020. In connection with this lease, we recognized an operating lease right-of-use asset and a lease liability with remaining balances of $69.0 million and $69.9 million, respectively, as of December 31, 2020.

The following table sets forth information about our lease costs for the periods indicated:

		Years Ended December 31,
	Location in our Consolidated Statement of Income	2021		2020
		(Thousands of dollars)
Operating leases	Operations and maintenance	$	17,747	$	17,162
Finance lease
Amortization of lease assets	Depreciation and amortization	1,139		1,131
Interest on lease liabilities	Interest expense	2,338		2,537
Total lease cost		$	21,224	$	20,830

The following table sets forth information about our leases for the periods indicated:

	December 31, 2021	December 31, 2020
Weighted average remaining lease term (years)
Operating leases	7.8	8.3
Finance lease	6.6	7.8
Weighted average discount rate (a)
Operating leases	3.40%	3.20%
Finance lease	9.60%	10.00%

(a) - Our weighted-average discount rates represent the rate implicit in the lease or our incremental borrowing rate for a term equal to the remaining term of the lease.

The following table sets forth the maturity of our lease liabilities as of December 31, 2021:

	Finance Lease		Operating Leases
	(Millions of dollars)
2022	$	4.7	$	16.4
2023	4.7		13.9
2024	4.7		12.6
2025	5.4		11.2
2026	4.5		11.4
2027 and beyond	8.3		36.9
Total lease payments	32.3		102.4
Less: Interest	8.6		13.0
Present value of lease liabilities	$	23.7	$	89.4

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REVENUES (Notes)

12 Months Ended

Dec. 31, 2021

Revenue from Contract with Customer [Abstract]

Revenue from Contract with Customer [Text Block]

REVENUES

Contract Assets and Contract Liabilities - Our contract asset balances at the beginning and end of the years ended December 31, 2021 and 2020, primarily relate to our firm service transportation contracts with tiered rates, which are not material. The following table sets forth the balances in contract liabilities for the periods indicated:

Contract Liabilities	(Millions of dollars)
Balance at January 1, 2020	$	57.1
Revenue recognized included in beginning balance (c)	(36.1)
Net additions	20.4
Balance at December 31, 2020 (a)	41.4
Revenue recognized included in beginning balance	(23.7)
Net additions	33.8
Balance at December 31, 2021 (b)	$	51.5

(a) - Contract liabilities of $23.7 million and $17.7 million are included in other current liabilities and other deferred credits, respectively, in our Consolidated Balance Sheet.

(b) - Contract liabilities of $35.3 million and $16.2 million are included in other current liabilities and other deferred credits, respectively, in our Consolidated Balance Sheet.

(c) - Includes a contract settlement of revenue previously deferred.

Receivables from Customers and Revenue Disaggregation - Substantially all of the balances in accounts receivable on our Consolidated Balance Sheets at December 31, 2021 and 2020, relate to customer receivables. Revenues sources are disaggregated in Note Q.

Transaction Price Allocated to Unsatisfied Performance Obligations - We do not disclose the value of unsatisfied performance obligations for (i) contracts with an original expected length of one year or less and (ii) variable consideration on contracts for which we recognize revenue at the amount to which we have the right to invoice for services performed.

The following table presents aggregate value allocated to unsatisfied performance obligations as of December 31, 2021, and the amounts we expect to recognize in revenue in future periods, related primarily to firm transportation and storage contracts with remaining contract terms ranging from one month to 22 years:

Expected Period of Recognition in Revenue	(Millions of dollars)
2022	$	339.1
2023	288.2
2024	238.1
2025	162.7
2026 and beyond	781.3
Total estimated transaction price allocated to unsatisfied performance obligations	$	1,809.4

The table above excludes variable consideration allocated entirely to wholly unsatisfied performance obligations, wholly unsatisfied promises to transfer distinct goods or services that are part of a single performance obligation and consideration we determine to be fully constrained. Information on the nature of the variable consideration excluded and the nature of the performance obligations to which the variable consideration relates can be found in the description of the major contract types discussed in Note A. The amounts we determined to be fully constrained relate to future sales obligations under long-term sales contracts where the transaction price is not known and minimum volume agreements, which we consider to be fully constrained until invoiced.

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SEGMENTS (Notes)

12 Months Ended

Dec. 31, 2021

Segment Reporting, Disclosure of Entity's Reportable Segments [Abstract]

SEGMENTS

SEGMENTS

Segment Descriptions - Our operations are divided into three reportable business segments, as follows:

•our Natural Gas Gathering and Processing segment gathers, treats and processes natural gas;

•our Natural Gas Liquids segment gathers, treats, fractionates and transports NGLs and stores, markets and distributes NGL products; and

•our Natural Gas Pipelines segment transports and stores natural gas via regulated intrastate and interstate natural gas transmission pipelines and natural gas storage facilities.

Other and eliminations consist of corporate costs, the operating and leasing activities of our headquarters building and related parking facility and eliminations necessary to reconcile our reportable segments to our Consolidated Financial Statements.

For the year ended December 31, 2021, revenues from one customer in our Natural Gas Liquids segment represents approximately 11.6% of our consolidated revenues. For the years ended December 31, 2020 and 2019, we had no single customer from which we received 10% or more of our consolidated revenues.

Operating Segment Information - The following tables set forth certain selected financial information for our operating segments for the periods indicated:

Year Ended December 31, 2021	Natural Gas Gathering and Processing		Natural Gas Liquids (a)		Natural Gas Pipelines (b)		Total Segments
	(Thousands of dollars)
NGL and condensate sales	$	2,821,175	$	13,653,120	$	—	$	16,474,295
Residue natural gas sales	1,483,898		—		115,495		1,599,393
Gathering, processing and exchange services revenue	135,501		517,758		—		653,259
Transportation and storage revenue	—		179,619		490,498		670,117
Other	20,965		41,376		910		63,251
Total revenues (c)	4,461,539		14,391,873		606,903		19,460,315
Cost of sales and fuel (exclusive of depreciation and operating costs)	(3,226,078)		(11,939,661)		(11,236)		(15,176,975)
Operating costs	(367,390)		(528,084)		(170,257)		(1,065,731)
Equity in net earnings from investments	3,757		21,000		97,763		122,520
Noncash compensation expense and other	17,299		18,511		4,637		40,447
Segment adjusted EBITDA	$	889,127	$	1,963,639	$	527,810	$	3,380,576
Depreciation and amortization	$	(260,011)	$	(298,937)	$	(58,702)	$	(617,650)
Investments in unconsolidated affiliates	$	27,018	$	416,648	$	353,947	$	797,613
Total assets	$	6,768,955	$	14,502,372	$	2,143,307	$	23,414,634
Capital expenditures	$	275,165	$	306,949	$	92,617	$	674,731

(a) - Our Natural Gas Liquids segment has regulated and nonregulated operations. Our Natural Gas Liquids segment’s regulated operations had revenues of $2.4 billion, of which $2.2 billion related to revenues within the segment, and cost of sales and fuel of $607.5 million.

(b) - Our Natural Gas Pipelines segment has regulated and nonregulated operations. Our Natural Gas Pipelines segment’s regulated operations had revenues of $394.2 million and cost of sales and fuel of $24.3 million.

(c) - Intersegment revenues are primarily commodity sales which are based on the contracted selling price, which is generally index-based and settled monthly, and for the Natural Gas Gathering and Processing segment totaled $2.9 billion. Intersegment revenues for the Natural Gas Liquids and Natural Gas Pipelines segments were not material.

Year Ended December 31, 2021	Total Segments		Other and Eliminations		Total
	(Thousands of dollars)
Reconciliations of total segments to consolidated
NGL and condensate sales	$	16,474,295	$	(2,904,598)	$	13,569,697
Residue natural gas sales	1,599,393		—		1,599,393
Gathering, processing and exchange services revenue	653,259		—		653,259
Transportation and storage revenue	670,117		(13,121)		656,996
Other	63,251		(2,287)		60,964
Total revenues (a)	$	19,460,315	$	(2,920,006)	$	16,540,309
Cost of sales and fuel (exclusive of depreciation and operating costs)	$	(15,176,975)	$	2,920,320	$	(12,256,655)
Operating costs	$	(1,065,731)	$	(1,357)	$	(1,067,088)
Depreciation and amortization	$	(617,650)	$	(4,051)	$	(621,701)
Equity in net earnings from investments	$	122,520	$	—	$	122,520
Investments in unconsolidated affiliates	$	797,613	$	—	$	797,613
Total assets	$	23,414,634	$	206,979	$	23,621,613
Capital expenditures	$	674,731	$	22,123	$	696,854

(a) - Noncustomer revenue for the year ended December 31, 2021, totaled $(565.0) million related primarily to losses from derivatives on commodity contracts.

Year Ended December 31, 2020	Natural Gas Gathering and Processing		Natural Gas Liquids (a)		Natural Gas Pipelines (b)		Total Segments
	(Thousands of dollars)
NGL and condensate sales	$	889,388	$	6,409,332	$	—	$	7,298,720
Residue natural gas sales	771,486		—		8,693		780,179
Gathering, processing and exchange services revenue	141,943		488,574		—		630,517
Transportation and storage revenue	—		182,915		470,097		653,012
Other	17,304		9,192		1,192		27,688
Total revenues (c)	1,820,121		7,090,013		479,982		9,390,116
Cost of sales and fuel (exclusive of depreciation and operating costs)	(843,976)		(5,108,558)		(6,809)		(5,959,343)
Operating costs	(326,938)		(412,900)		(141,713)		(881,551)
Equity in net earnings (loss) from investments	(1,123)		39,938		104,426		143,241
Noncash compensation expense and other	1,952		8,748		1,540		12,240
Segment adjusted EBITDA	$	650,036	$	1,617,241	$	437,426	$	2,704,703
Depreciation and amortization	$	(247,010)	$	(271,900)	$	(55,739)	$	(574,649)
Impairment charges	$	(566,145)	$	(78,785)	$	—	$	(644,930)
Investments in unconsolidated affiliates	$	22,757	$	423,494	$	358,781	$	805,032
Total assets	$	6,499,908	$	13,636,109	$	2,100,213	$	22,236,230
Capital expenditures	$	446,142	$	1,655,759	$	71,918	$	2,173,819

(a) - Our Natural Gas Liquids segment has regulated and nonregulated operations. Our Natural Gas Liquids segment’s regulated operations had revenues of $2.0 billion, of which $1.8 billion related to revenues within the segment, and cost of sales and fuel of $520.6 million.

(b) - Our Natural Gas Pipelines segment has regulated and nonregulated operations. Our Natural Gas Pipelines segment’s regulated operations had revenues of $298.5 million and cost of sales and fuel of $30.4 million.

(c) - Intersegment revenues are primarily commodity sales which are based on the contracted selling price, which is generally index-based and settled monthly, and for the Natural Gas Gathering and Processing segment totaled $865.6 million. Intersegment revenues for the Natural Gas Liquids and Natural Gas Pipelines segments were not material.

Year Ended December 31, 2020	Total Segments		Other and Eliminations		Total
	(Thousands of dollars)
Reconciliations of total segments to consolidated
NGL and condensate sales	$	7,298,720	$	(820,851)	$	6,477,869
Residue natural gas sales	780,179		(10,860)		769,319
Gathering, processing and exchange services revenue	630,517		—		630,517
Transportation and storage revenue	653,012		(14,599)		638,413
Other	27,688		(1,564)		26,124
Total revenues (a)	$	9,390,116	$	(847,874)	$	8,542,242
Cost of sales and fuel (exclusive of depreciation and operating costs)	$	(5,959,343)	$	849,197	$	(5,110,146)
Operating costs	$	(881,551)	$	(4,653)	$	(886,204)
Depreciation and amortization	$	(574,649)	$	(4,013)	$	(578,662)
Impairment charges	$	(644,930)	$	—	$	(644,930)
Equity in net earnings from investments	$	143,241	$	—	$	143,241
Investments in unconsolidated affiliates	$	805,032	$	—	$	805,032
Total assets	$	22,236,230	$	842,524	$	23,078,754
Capital expenditures	$	2,173,819	$	21,562	$	2,195,381

(a) - Noncustomer revenue for the year ended December 31, 2020, totaled $65.8 million related primarily to gains from derivatives on commodity contracts.

Year Ended December 31, 2019	Natural Gas Gathering and Processing		Natural Gas Liquids (a)		Natural Gas Pipelines (b)		Total Segments
	(Thousands of dollars)
NGL and condensate sales	$	1,224,378	$	7,910,833	$	—	$	9,135,211
Residue natural gas sales	966,149		—		1,244		967,393
Gathering, processing and exchange services revenue	164,299		414,238		—		578,537
Transportation and storage revenue	—		197,483		466,266		663,749
Other	13,813		9,962		4,477		28,252
Total revenues (c)	2,368,639		8,532,516		471,987		11,373,142
Cost of sales and fuel (exclusive of depreciation and operating costs)	(1,302,310)		(6,690,918)		(4,628)		(7,997,856)
Operating costs	(368,352)		(456,892)		(157,230)		(982,474)
Equity in net earnings (loss) from investments	(6,292)		65,123		95,710		154,541
Noncash compensation expense and other	10,965		15,936		2,977		29,878
Segment adjusted EBITDA	$	702,650	$	1,465,765	$	408,816	$	2,577,231
Depreciation and amortization	$	(219,519)	$	(196,132)	$	(57,250)	$	(472,901)
Investments in unconsolidated affiliates	$	34,426	$	439,393	$	388,025	$	861,844
Total assets	$	6,795,744	$	12,551,476	$	2,094,072	$	21,441,292
Capital expenditures	$	926,489	$	2,796,604	$	99,221	$	3,822,314

(a) - Our Natural Gas Liquids segment has regulated and nonregulated operations. Our Natural Gas Liquids segment’s regulated operations had revenues of $1.4 billion, of which $1.2 billion related to revenues within the segment, and cost of sales and fuel of $496.8 million.

(b) - Our Natural Gas Pipelines segment has regulated and nonregulated operations. Our Natural Gas Pipelines segment’s regulated operations had revenues of $285.3 million and cost of sales and fuel of $20.0 million.

(c) - Intersegment revenues are primarily commodity sales which are based on the contracted selling price, which is generally index-based and settled monthly, and for the Natural Gas Gathering and Processing segment totaled $1.2 billion. Intersegment revenues for the Natural Gas Liquids and Natural Gas Pipelines segments were not material.

Year Ended December 31, 2019	Total Segments		Other and Eliminations		Total
	(Thousands of dollars)
Reconciliations of total segments to consolidated
NGL and condensate sales	$	9,135,211	$	(1,190,424)	$	7,944,787
Residue natural gas sales	967,393		(1,418)		965,975
Gathering, processing and exchange services revenue	578,537		—		578,537
Transportation and storage revenue	663,749		(15,646)		648,103
Other	28,252		(1,287)		26,965
Total revenues (a)	$	11,373,142	$	(1,208,775)	$	10,164,367
Cost of sales and fuel (exclusive of depreciation and operating costs)	$	(7,997,856)	$	1,209,816	$	(6,788,040)
Operating costs	$	(982,474)	$	(390)	$	(982,864)
Depreciation and amortization	$	(472,901)	$	(3,634)	$	(476,535)
Equity in net earnings from investments	$	154,541	$	—	$	154,541
Investments in unconsolidated affiliates	$	861,844	$	—	$	861,844
Total assets	$	21,441,292	$	370,829	$	21,812,121
Capital expenditures	$	3,822,314	$	26,035	$	3,848,349

(a) - Noncustomer revenue for the year ended December 31, 2019, totaled $139.6 million related primarily to gains from derivatives on commodity contracts.

	Years Ended December 31,
	2021		2020		2019
Reconciliation of net income to total segment adjusted EBITDA	(Thousands of dollars)
Net income	$	1,499,706	$	612,809	$	1,278,577
Add:
Interest expense, net of capitalized interest	732,924		712,886		491,773
Depreciation and amortization	621,701		578,662		476,535
Income tax expense	484,498		189,507		372,414
Impairment charges	—		644,930		—
Noncash compensation expense	42,592		8,540		26,699
Other corporate costs and equity AFUDC (a)	(845)		(42,631)		(68,767)
Total segment adjusted EBITDA	$	3,380,576	$	2,704,703	$	2,577,231

(a) - The year ended December 31, 2020, includes corporate net gains of $22.3 million on extinguishment of debt related to open market repurchases. The year ended December 31, 2019, includes higher equity AFUDC related to our capital-growth projects compared with 2020.

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)

12 Months Ended

Dec. 31, 2021

New Accounting Pronouncements or Change in Accounting Principle [Line Items]

Consolidation

Consolidation - Our Consolidated Financial Statements include our accounts and the accounts of our subsidiaries over which we have control or are the primary beneficiary. All intercompany balances and transactions have been eliminated in consolidation.

Investments in unconsolidated affiliates are accounted for using the equity method if we have the ability to exercise significant influence over operating and financial policies of our investee. Under this method, an investment is carried at its acquisition cost and adjusted each period for contributions made, distributions received and our share of the investee’s comprehensive income. For the investments we account for under the equity method, the premium or excess cost over underlying fair value of net assets is referred to as equity-method goodwill. Impairment of equity investments is recorded when the impairments are other than temporary. These amounts are recorded as investments in unconsolidated affiliates on our accompanying Consolidated Balance Sheets. See Note M for disclosures of our unconsolidated affiliates.

Distributions paid to us from our unconsolidated affiliates are classified as operating activities on our Consolidated Statements of Cash Flows until the cumulative distributions exceed our proportionate share of income from the unconsolidated affiliate since the date of our initial investment. The amount of cumulative distributions paid to us that exceeds our cumulative proportionate share of income in each period represents a return of investment and is classified as an investing activity on our Consolidated Statements of Cash Flows.

Use of Estimates

Use of Estimates - The preparation of our Consolidated Financial Statements and related disclosures in accordance with GAAP requires us to make estimates and assumptions with respect to values or conditions that cannot be known with certainty that affect the reported amounts on our Consolidated Financial Statements. Items that may be estimated include, but are not limited to, the economic useful life of assets, fair value of assets, liabilities and equity-method investments, obligations under employee benefit plans, provisions for uncollectible accounts receivable, expenses for services received but for which no invoice has been received, provision for income taxes, including any deferred tax valuation allowances, the results of litigation and various other

recorded or disclosed amounts. In addition, a portion of our revenues and cost of sales and fuel are recorded based on current month prices and estimated volumes. The estimates are reversed in the following month when we record actual volumes.

We evaluate our estimates on an ongoing basis using historical experience, consultation with experts and other methods we consider reasonable based on the particular circumstances. Nevertheless, actual results may differ significantly from the estimates. Any effects on our financial position or results of operations from revisions to these estimates are recorded in the period when the facts that give rise to the revision become known.

Fair Value Measurements

Fair Value Measurements - For our fair value measurements, we utilize market prices, third-party pricing services, present value methods and standard option valuation models to determine the price we would receive from the sale of an asset or the transfer of a liability in an orderly transaction at the measurement date. We measure the fair value of a group of financial assets and liabilities consistent with how a market participant would price the net risk exposure at the measurement date.

Many of the contracts in our derivative portfolio are executed in liquid markets where price transparency exists. Our financial commodity derivatives are generally settled through a NYMEX or ICE clearing broker account with daily margin requirements. We validate our valuation inputs with third-party information and settlement prices from other sources, where available.

We compute the fair value of our derivative portfolio by discounting the projected future cash flows from our derivative assets and liabilities to present value using interest-rate yields to calculate present-value discount factors derived from the implied forward SOFR, LIBOR or other yield curve, as appropriate. The fair value of our forward-starting interest-rate swaps is determined using financial models that incorporate the implied forward LIBOR yield curve for the same period as the future interest-rate swap settlements. We consider current market data in evaluating counterparties’, as well as our own, nonperformance risk, net of collateral, by using counterparty-specific bond yields. Although we use our best estimates to determine the fair value of the derivative contracts we have executed, the ultimate market prices realized could differ materially from our estimates.

Fair Value Hierarchy - At each balance sheet date, we utilize a fair value hierarchy to classify fair value amounts recognized or disclosed in our financial statements based on the observability of inputs used to estimate such fair value. The levels of the hierarchy are described below:

•Level 1 - fair value measurements are based on unadjusted quoted prices for identical securities in active markets. These balances are composed predominantly of exchange-traded derivative contracts for natural gas and crude oil.

•Level 2 - fair value measurements are based on significant observable pricing inputs, including quoted prices for similar assets and liabilities in active markets and inputs from third-party pricing services supported with corroborative evidence. These balances are composed of exchange cleared derivatives to hedge natural gas basis and NGL price risk at certain market locations and over-the-counter interest-rate derivatives.

•Level 3 - fair value measurements are based on inputs that may include one or more unobservable inputs, including internally developed commodity price curves that incorporate market data from broker quotes and third-party pricing services. These balances are composed predominantly of exchange-cleared and over-the-counter derivatives to hedge NGL price risk at certain market locations. These commodity derivatives are generally valued using forward quotes provided by third-party pricing services that are validated with other market data. We believe any measurement uncertainty at December 31, 2021, is immaterial as our Level 3 fair value measurements are based on unadjusted pricing information from broker quotes and third-party pricing services.

Determining the appropriate classification of our fair value measurements within the fair value hierarchy requires management’s judgment regarding the degree to which market data is observable or corroborated by observable market data. We categorize derivatives based on the lowest level input that is significant to the fair value measurement in its entirety.

See Note B for our fair value measurements disclosures.

Cash and Cash Equivalents

Cash and Cash Equivalents - Cash equivalents consist of highly liquid investments, which are readily convertible into cash and have original maturities of three months or less.

Revenue from Contract with Customer [Policy Text Block]

Revenue Recognition - Revenues are recognized when control of the promised goods or services is transferred to our customers in an amount that reflects the consideration we expect to be entitled to receive in exchange for those goods or services. Our payment terms vary by customer and contract type, including requiring payment before products or services are delivered to certain customers. However, the term between customer prepayments, completion of our performance obligations, invoicing and receipt of payment due is not significant.

Performance Obligations and Revenue Sources - Revenue sources are disaggregated in Note Q and are derived from commodity sales and services revenues, as described below:

Commodity Sales (all segments) - We contract to deliver residue natural gas, condensate, unfractionated NGLs and/or NGL products to customers at a specified delivery point. Our sales agreements may be daily or longer-term contracts for a specified volume. We consider the sale and delivery of each unit of a commodity an individual performance obligation as the customer is expected to control, accept and benefit from each unit individually. We record revenue when the commodity is delivered to the customer as this represents the point in time when control of the product is transferred to the customer. Revenue is recorded based on the contracted selling price, which is generally index-based and settled monthly.

Services

Gathering only contracts (Natural Gas Gathering and Processing segment) - Under this type of contract, we charge fees for providing midstream services, which include gathering and treating our customer’s natural gas. Our performance obligation begins with delivery of raw natural gas to our system. This service is treated as one performance obligation that is satisfied over time. We use the output method based on delivery of product to our system as the measure of progress, as our services are performed simultaneously.

Fee with POP contracts with producer take-in-kind rights (Natural Gas Gathering and Processing segment) - Under this type of contract, we do not control the stream of unprocessed natural gas that we receive at the wellhead due to the producer’s take-in-kind rights. We purchase a portion of the raw natural gas stream, charge fees for providing midstream services, which include gathering, treating, compressing and processing our customer’s natural gas. After performing these services, we return primarily the residue natural gas to the producer, sell the remaining commodities and remit a portion of the commodity sales proceeds to the producer less our contractual fees. Our performance obligation begins with delivery of raw natural gas to our system. This service is treated as one performance obligation that is satisfied over time. We use the output method based on delivery of product to our system as the measure of progress, as our services are performed simultaneously.

Transportation and exchange contracts (Natural Gas Liquids segment) - Under this type of contract, we charge fees for providing midstream services, which may include a bundled combination of gathering, transporting and/or fractionation of our customer’s NGLs. Our performance obligation begins with delivery of unfractionated NGLs or NGL products to our system. These services represent a series of distinct services that are treated as one performance obligation that is satisfied over time. We use the output method based on delivery of product to our system as the measure of progress, as our services are performed simultaneously. For transportation services under a tariff on our NGL transportation pipelines, fees are recorded upon redelivery to our customer at the completion of the transportation services.

Storage contracts (Natural Gas Liquids and Natural Gas Pipelines segments) - We reserve a stated storage capacity and inject/withdraw/store commodities for our customer. The capacity reservation and injection/withdrawal/storage services are considered a bundled service, as we integrate them into one stand-ready obligation provided on a daily basis over the life of the agreement and satisfied over time. Fixed capacity reservation fees are allocated and evenly recognized in revenue. Capacity reservation fees that vary based on a stated or implied economic index and correspond with the costs to provide our services are recognized in revenue as invoiced to our customers. For contracts that do not include a capacity reservation, transportation, injection and withdrawal fees are recognized in revenue as those services are provided and are dependent on the volume transported, injected or withdrawn by our customer, which is at our customer’s discretion. We use the output method based on the passage of time to measure satisfaction of the performance obligation associated with our daily stand-ready services.

Firm service transportation contracts (Natural Gas Pipelines segment) - We reserve a stated transportation capacity and transport commodities for our customer. The capacity reservation and transportation services are considered a bundled service, as we integrate them into one stand-ready obligation provided on a daily basis over the life of the agreement and satisfied over time. Fixed capacity reservation fees are allocated and evenly recognized in revenue. Capacity reservation fees that vary based on a stated or implied economic index and correspond with the costs to provide our services are recognized in revenue based on a daily effective fee rate. If the capacity reservation fees vary solely as a contract feature, contract assets or liabilities are recorded for the difference between the amount recorded in revenue and the amount billed to the customer. Transportation fees are recognized in revenue as those services are provided and are dependent on the volume transported by our customer, which is at our customer’s discretion. We use the output method based on the passage of time to measure satisfaction of the performance obligation associated with our daily stand-ready services.

Interruptible transportation contracts (Natural Gas Pipelines segment) - We agree to transport natural gas on our pipelines between the customer’s nominated receipt and delivery points if capacity is available after satisfying firm transportation service obligations. The transaction price is based on the transportation fees times the volumes transported. We use the output method

based on delivery of product to the customer to measure satisfaction of the performance obligation. The total consideration for delivered volumes is recorded in revenue at the time of delivery, when the customer obtains control.

Many of the contract types described above contain additional fees or charges payable by customers for nonperformance (e.g., minimum volume commitments or product specifications), which are considered to be variable consideration. These fees and charges are not recorded until it is probable that a significant reversal of the associated revenue will not occur.

See Note P for our revenue disclosures.

Contract Assets and Contract Liabilities - Contract assets and contract liabilities are recorded when the amount of revenue recognized from a contract with a customer differs from the amount billed to the customer and recorded in accounts receivable. Our contract asset balances at the beginning and end of the period primarily relate to our firm service transportation contracts with tiered rates. Our contract liabilities primarily represent deferred revenue on NGL storage contracts for which revenue is recognized over a one-year term, and deferred revenue on contributions in aid of construction received from customers for which revenue is recognized over the contract periods, which range from 5 to 10 years.

Cost of Sales and Fuel

Cost of Sales and Fuel - Cost of sales and fuel primarily includes (i) the cost of purchased commodities, including NGLs, natural gas and condensate, (ii) fees incurred for third-party transportation, fractionation and storage of commodities, (iii) fuel and power costs incurred to operate our own facilities that gather, process, transport and store commodities, and (iv) an offset from the contractual fees deducted from the cost of purchased commodities under the contract types below:

Fee with POP contracts with no producer take-in-kind rights (Natural Gas Gathering and Processing segment) - We purchase raw natural gas and charge contractual fees for providing midstream services, which include gathering, treating, compressing and processing the producer’s natural gas. After performing these services, we sell the commodities and return a portion of the commodity sales proceeds to the producer less our contractual fees.

Purchase with fee (Natural Gas Liquids segment) - Under this type of contract, we purchase raw, unfractionated NGLs at an index price and charge fees for providing midstream services, which may include a bundled combination of gathering, transporting and/or fractionation of our customer’s NGLs.

Operations and Maintenance

Operations and Maintenance - Operations and maintenance primarily includes (i) payroll and benefit costs, (ii) third-party costs for operations, maintenance and integrity management, regulatory compliance and environmental and safety, and (iii) other business-related service costs.

Accounts Receivable

Accounts Receivable - Accounts receivable represent valid claims against nonaffiliated customers for products sold or services rendered. We present accounts receivable net of an allowance for credit losses to reflect the net amount expected to be collected. We assess the creditworthiness of our counterparties on an ongoing basis and require security, including prepayments and other forms of collateral, when appropriate. Outstanding customer receivables are reviewed regularly for possible nonpayment indicators, and allowances for credit losses are recorded based upon management’s estimate of collectability, current conditions and supportable forecasts at each balance sheet date. At December 31, 2021, our allowance for credit losses was not material.

Inventory

Inventory - The values of current NGLs and natural gas in storage are determined using the lower of weighted-average cost or net realizable value. Noncurrent NGLs and natural gas are classified as property and valued at cost. Materials and supplies are valued at average cost. Certain large equipment inventory, which will ultimately be included in property, plant and equipment when utilized, is included in other assets in our Consolidated Balance Sheets and is valued at weighted-average cost.

Commodity Imbalances

Commodity Imbalances - Commodity imbalances represent amounts payable or receivable for NGL exchange contracts and natural gas pipeline imbalances and are valued at market prices. Under the majority of our NGL exchange agreements, we physically receive volumes of unfractionated NGLs, including the risk of loss and legal title to such volumes, from the exchange counterparty. In turn, we deliver NGL products back to the customer and charge them gathering, transportation and fractionation fees. To the extent that the volumes we receive under such agreements differ from those we deliver, we record a net exchange receivable or payable position with the counterparties. These net exchange receivables and payables are generally settled with movements of NGL products rather than with cash. Natural gas pipeline imbalances are settled in cash or in-kind, subject to the terms of the pipelines’ tariffs or by agreement.

Derivatives and Risk Management

Derivatives and Risk Management - We utilize derivatives to reduce our market-risk exposure to commodity price and interest-rate fluctuations and to achieve more predictable cash flows. We record all derivative instruments at fair value, with the exception of normal purchases and normal sales transactions that are expected to result in physical delivery. Commodity price and interest-rate volatility may have a significant impact on the fair value of derivative instruments as of a given date. The accounting for changes in the fair value of a derivative instrument depends on whether it has been designated and qualifies as part of a hedging relationship and, if so, the reason for holding it. The table below summarizes the various ways in which we account for our derivative instruments and the impact on our Consolidated Financial Statements:

		Recognition and Measurement
Accounting Treatment		Balance Sheet		Income Statement
Normal purchases and normal sales	-	Fair value not recorded	-	Change in fair value not recognized in earnings
Mark-to-market	-	Recorded at fair value	-	Change in fair value recognized in earnings
Cash flow hedge	-	Recorded at fair value. The gain or loss on the derivative instrument is reported initially as a component of accumulated other comprehensive income (loss)	-	The gain or loss on the derivative instrument is reclassified out of accumulated other comprehensive income (loss) into earnings when the forecasted transaction affects earnings
Fair value hedge	-	Recorded at fair value	-	The gain or loss on the derivative instrument is recognized in earnings
	-	Change in fair value of the hedged item is recorded as an adjustment to book value	-	Change in fair value of the hedged item is recognized in earnings

To reduce our exposure to fluctuations in natural gas, NGLs and condensate prices, we periodically enter into futures, forward purchases and sales, options or swap transactions in order to hedge anticipated purchases and sales of natural gas, NGLs and condensate. Interest-rate swaps are used from time to time to manage interest-rate risk. Under certain conditions, we designate our derivative instruments as a hedge of exposure to changes in fair values or cash flows. We formally document all relationships between hedging instruments and hedged items, as well as risk-management objectives and strategies for undertaking various hedge transactions, and methods for assessing and testing correlation and hedge effectiveness. We specifically identify the forecasted transaction that has been designated as the hedged item in a cash flow hedge relationship. We assess hedging relationships at the inception of the hedge and on an ongoing basis to determine whether the hedging relationship is, and is expected to remain, highly effective. We also document our normal purchases and normal sales transactions that we expect to result in physical delivery and that we elect to exempt from derivative accounting treatment.

The realized revenues and purchase costs of our derivative instruments not considered held for trading purposes and derivatives that qualify as normal purchases or normal sales that are expected to result in physical delivery are reported on a gross basis.

Cash flows from futures, forwards, options and swaps that are accounted for as hedges are included in the same category as the cash flows from the related hedged items in our Consolidated Statements of Cash Flows.

See Notes B and C for disclosures of our fair value measurements and risk-management and hedging activities, respectively.

Property, Plant and Equipment

Property, Plant and Equipment - Our properties are stated at cost, including AFUDC and capitalized interest. In some cases, the cost of regulated property retired or sold, plus removal costs, less salvage, is charged to accumulated depreciation. Gains and losses from sales or transfers of nonregulated properties or an entire operating unit or system of our regulated properties are recognized in income. Maintenance and repairs are charged directly to expense.

The interest portion of AFUDC and capitalized interest represent the cost of borrowed funds used to finance construction activities for regulated and nonregulated projects, respectively. We capitalize interest costs during the construction or upgrade of qualifying assets. These costs are recorded as a reduction to interest expense. The equity portion of AFUDC represents the capitalization of the estimated average cost of equity used during the construction of major projects and is recorded in the cost of our regulated properties and as a credit to the allowance for equity funds used during construction.

Our properties are depreciated using the straight-line method over their estimated useful lives. Generally, we apply depreciation rates to functional groups of property having similar economic lives. We periodically conduct depreciation studies to assess the economic lives of our assets. For our regulated assets, these depreciation studies are completed as a part of our rate proceedings or tariff filings, and the changes in economic lives, if applicable, are implemented prospectively when the new rates are approved. For our nonregulated assets, if it is determined that the estimated economic life changes, the changes are made prospectively. Changes in the estimated economic lives of our property, plant and equipment could have a material effect on our financial position or results of operations.

Property, plant and equipment on our Consolidated Balance Sheets includes construction work in process for capital projects that have not yet been placed in service and therefore are not being depreciated. Assets are transferred out of construction work in process when they are substantially complete and ready for their intended use.

See Note D for our property, plant and equipment disclosures.

Impairment of Goodwill and Long-Lived Assets, including Intangible Assets

Impairment of Goodwill and Long-Lived Assets, Including Intangible Assets - We assess our goodwill for impairment at least annually as of July 1, unless events or changes in circumstances indicate an impairment may have occurred before that time. Our qualitative goodwill impairment analysis performed as of July 1, 2021, did not result in an impairment charge nor did our analysis reflect any reporting units at risk, and subsequent to that date, no event has occurred indicating that the implied fair value of each of our reporting units is less than the carrying value of its net assets.

Goodwill - As part of our goodwill impairment test, we assess qualitative factors (including macroeconomic conditions, industry and market considerations, cost factors and overall financial performance) to determine whether it was more likely than not that the fair value of each of our reporting units was less than their carrying amount. If further testing is necessary or a quantitative test is elected, we perform a Step 1 analysis. In a Step 1 analysis, an assessment is made by comparing the fair value of a reporting unit with its carrying amount, including goodwill. If the carrying value of a reporting unit exceeds its fair value, an impairment loss is recognized in an amount equal to that excess, limited to the total amount of goodwill allocated to that reporting unit.

To estimate the fair value of our reporting units, we use two generally accepted valuation approaches, an income approach and a market approach, using assumptions consistent with a market participant’s perspective. Under the income approach, we use anticipated cash flows over a period of years plus a terminal value and discount these amounts to their present value using appropriate discount rates. Under the market approach, we apply EBITDA multiples to forecasted EBITDA. The multiples used are consistent with recent market transactions. The forecasted cash flows are based on probability weighted-average possible future cash flows for a reporting unit over a period of years.

Long-lived assets - We assess our long-lived assets for impairment whenever events or changes in circumstances indicate that an asset’s carrying amount may not be recoverable. An impairment is indicated if the carrying amount of a long-lived asset exceeds the sum of the undiscounted future cash flows expected to result from the use and eventual disposition of the asset. If an impairment is indicated, we record an impairment loss equal to the difference between the carrying value and the fair value of the long-lived asset.

Investments in unconsolidated affiliates - The impairment test for equity-method investments considers whether the fair value of the equity investment as a whole, not the underlying net assets, has declined and whether that decline is other than temporary. Therefore, we periodically evaluate the amount at which we carry our equity-method investments to determine whether current events or circumstances warrant adjustments to our carrying values.

See Notes D, E and M for our disclosures and related impairment charges related to long-lived assets, goodwill and intangible assets and investments in unconsolidated affiliates, respectively.

Regulation

Regulation - Depending on the specific service provided, our natural gas transmission pipelines, NGL pipelines and certain natural gas storage facilities are subject to rate regulation and/or accounting requirements by one or more of the FERC, OCC, KCC and RRC. Accordingly, portions of our Natural Gas Liquids and Natural Gas Pipelines segments follow the accounting and reporting guidance for regulated operations. In our Consolidated Financial Statements and our Notes to Consolidated Financial Statements, regulated operations are defined pursuant to Financial Accounting Standards Board’s (FASB) Accounting Standards Codification 980, Regulated Operations. During the rate-making process for certain of our assets, regulatory authorities set the framework for what we can charge customers for our services and establish the manner that our costs are accounted for, including allowing us to defer recognition of certain costs and permitting recovery of the amounts through rates over time as opposed to expensing such costs as incurred. Certain examples of types of regulatory guidance include costs for fuel and losses, acquisition costs, contributions in aid of construction, charges for depreciation, and gains or losses on disposition of assets. This allows us to stabilize rates over time rather than passing such costs on to the customer for immediate recovery. Actions by regulatory authorities could have an effect on the amounts we may charge our customers. Any difference in the amount recoverable and the amount deferred is recorded as income or expense at the time of the regulatory action. A write-off of regulatory assets and costs not recovered may be required if all or a portion of the regulated operations have rates that are no longer (i) established by independent, third-party regulators and (ii) set at levels that will recover our costs when considering the demand and competition for our services.

Retirement and Other Postretirement Employee Benefits

Retirement and Other Postretirement Employee Benefits - We have defined benefit retirement plans covering certain employees and former employees. We sponsor welfare plans that provide postretirement medical and life insurance benefits to certain employees hired prior to 2017 who retire with at least five years of service. The expense and liability related to these plans is calculated using statistical and other factors that attempt to anticipate future events. These factors include assumptions about the discount rate, expected return on plan assets, rate of future compensation increases, mortality and employment length. In determining the projected benefit obligations and costs, assumptions can change from period to period and may result in changes in the costs and liabilities we recognize.

See Note K for our retirement and other postretirement employee benefits disclosures.

We determine our overall expected long-term rate of return on plan assets based on our review of historical returns and economic growth models.We determine our discount rates annually utilizing portfolios of high-quality bonds matched to the estimated benefit cash flows of our retirement and other postretirement benefit plans. Bonds selected to be included in the portfolios are only those rated by S&P or Moody’s as an AA or Aa2 rating or better and exclude callable bonds, bonds with less than a minimum issue size, yield outliers and other filtering criteria to remove unsuitable bonds.

Income Taxes

Income Taxes - Deferred income taxes are provided for the difference between the financial statement and income tax basis of assets and liabilities and carryforward items based on income tax laws and rates existing at the time the temporary differences are expected to reverse. Generally, the effect of a change in tax rates on deferred tax assets and liabilities is recognized in income in the period that includes the enactment date of the rate change.

We utilize a more-likely-than-not recognition threshold and measurement attribute for the financial statement recognition and measurement of a tax position that is taken or expected to be taken in a tax return. We reflect penalties and interest as part of income tax expense as they become applicable for tax provisions that do not meet the more-likely-than-not recognition threshold and measurement attribute. For all periods presented, we had no uncertain tax positions that required the establishment of a material reserve.

We utilize the “with-and-without” approach for intra-period tax allocation for purposes of allocating total tax expense (or benefit) for the year among the various financial statement components.

We file numerous consolidated and separate income tax returns with federal tax authorities of the United States along with the tax authorities of several states. We are not under any United States federal audits or statute waivers at this time.

See Note L for our income taxes disclosures.

Asset Retirement Obligations

Asset Retirement Obligations - Asset retirement obligations represent legal obligations associated with the retirement of long-lived assets that result from the acquisition, construction, development and/or normal use of the asset. Certain of our natural gas gathering and processing, NGL and natural gas pipeline facilities are subject to agreements or regulations that give rise to our asset retirement obligations for removal or other disposition costs associated with retiring the assets in place upon the discontinued use of the assets. We recognize the fair value of a liability for an asset retirement obligation in the period when it is incurred if a reasonable estimate of the fair value can be made. We are not able to estimate reasonably the fair value of the asset retirement obligations for portions of our assets, primarily certain pipeline assets, because the settlement dates are indeterminable given our expected continued use of the assets with proper maintenance. We expect our pipeline assets, for which we are unable to estimate reasonably the fair value of the asset retirement obligation, will continue in operation as long as supply and demand for natural gas and NGLs exist. Based on the widespread use of natural gas for heating and cooking activities for residential users and electric-power generation for commercial users, as well as use of NGLs by the petrochemical industry, we expect supply and demand to exist for the foreseeable future.

For our assets that we are able to make an estimate, the fair value of the liability is added to the carrying amount of the associated asset, and this additional carrying amount is depreciated over the life of the asset. The liability is accreted at the end of each period through charges to operating expense. If the obligation is settled for an amount other than the carrying amount of the liability, we will recognize a gain or loss on settlement. The depreciation and accretion expense are immaterial to our Consolidated Financial Statements.

Contingencies

Contingencies - Our accounting for contingencies covers a variety of business activities, including contingencies for legal and environmental exposures. We accrue these contingencies when our assessments indicate that it is probable that a liability has been incurred or an asset will not be recovered and an amount can be estimated reasonably. We expense legal fees as incurred and base our legal liability estimates on currently available facts and our estimates of the ultimate outcome or resolution. Accruals for estimated losses from environmental remediation obligations generally are recognized no later than completion of a remediation feasibility study. Recoveries of environmental remediation costs from other parties are recorded as assets when their receipt is deemed probable. Our expenditures for environmental evaluation, mitigation, remediation and compliance to date have not been significant in relation to our financial position or results of operations, and our expenditures related to environmental matters had no significant effect on earnings or cash flows during 2021, 2020 and 2019. Actual results may differ from our estimates resulting in an impact, positive or negative, on earnings. See Note N for additional discussion of contingencies.

Share-Based Payments

Share-Based Payments - We expense the fair value of share-based payments net of estimated forfeitures. We estimate forfeiture rates based on historical forfeitures under our share-based payment plans.

See Note J for our share-based payments disclosures.

Earnings per Common Share

Earnings per Common Share - Basic EPS is calculated by dividing net income available to common shareholders by the daily weighted-average number of shares of common stock outstanding during the period, vested restricted and performance units that have been deferred and share awards deferred under the compensation plan for non-employee directors. Diluted EPS is calculated by dividing net income available to common shareholders by the daily weighted-average number of shares of common stock outstanding during the period plus potentially dilutive components. The dilutive components are calculated based on the dilutive effect for each quarter. For fiscal-year periods, the dilutive components for each quarter are averaged to arrive at the fiscal year-to-date dilutive component.

See Note I for our EPS disclosures.

Segment Reporting, Policy [Policy Text Block]

Segment Reporting - Our chief operating decision-maker reviews the financial performance of each of our three segments, as well as our financial performance as a whole, on a regular basis. Adjusted EBITDA by segment is utilized in this evaluation. We believe this financial measure is useful to investors because it and similar measures are used by many companies in our industry as a measurement of financial performance and are commonly employed by financial analysts and others to evaluate our financial performance and to compare financial performance among companies in our industry. Adjusted EBITDA for each segment is defined as net income adjusted for interest expense, depreciation and amortization, noncash impairment charges, income taxes, allowance for equity funds used during construction, noncash compensation expense, and other noncash items. This calculation may not be comparable with similarly titled measures of other companies.

See Note Q for our segments disclosures.

New Accounting Pronouncements

Except as discussed below, there have been no new accounting pronouncements that have become effective or have been issued that are of significance or potential significance to us. In January 2021, we adopted ASU 2019-12, “Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes,” which simplifies certain concepts in Topic 740, Income Taxes. The impact of adopting this standard was not material.

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Fair Value Measures and Disclosures (Policies)

12 Months Ended

Dec. 31, 2021

Fair Value Disclosures [Abstract]

Fair Value Measurements

Fair Value Measurements - For our fair value measurements, we utilize market prices, third-party pricing services, present value methods and standard option valuation models to determine the price we would receive from the sale of an asset or the transfer of a liability in an orderly transaction at the measurement date. We measure the fair value of a group of financial assets and liabilities consistent with how a market participant would price the net risk exposure at the measurement date.

Many of the contracts in our derivative portfolio are executed in liquid markets where price transparency exists. Our financial commodity derivatives are generally settled through a NYMEX or ICE clearing broker account with daily margin requirements. We validate our valuation inputs with third-party information and settlement prices from other sources, where available.

We compute the fair value of our derivative portfolio by discounting the projected future cash flows from our derivative assets and liabilities to present value using interest-rate yields to calculate present-value discount factors derived from the implied forward SOFR, LIBOR or other yield curve, as appropriate. The fair value of our forward-starting interest-rate swaps is determined using financial models that incorporate the implied forward LIBOR yield curve for the same period as the future interest-rate swap settlements. We consider current market data in evaluating counterparties’, as well as our own, nonperformance risk, net of collateral, by using counterparty-specific bond yields. Although we use our best estimates to determine the fair value of the derivative contracts we have executed, the ultimate market prices realized could differ materially from our estimates.

Fair Value Hierarchy - At each balance sheet date, we utilize a fair value hierarchy to classify fair value amounts recognized or disclosed in our financial statements based on the observability of inputs used to estimate such fair value. The levels of the hierarchy are described below:

•Level 1 - fair value measurements are based on unadjusted quoted prices for identical securities in active markets. These balances are composed predominantly of exchange-traded derivative contracts for natural gas and crude oil.

•Level 2 - fair value measurements are based on significant observable pricing inputs, including quoted prices for similar assets and liabilities in active markets and inputs from third-party pricing services supported with corroborative evidence. These balances are composed of exchange cleared derivatives to hedge natural gas basis and NGL price risk at certain market locations and over-the-counter interest-rate derivatives.

•Level 3 - fair value measurements are based on inputs that may include one or more unobservable inputs, including internally developed commodity price curves that incorporate market data from broker quotes and third-party pricing services. These balances are composed predominantly of exchange-cleared and over-the-counter derivatives to hedge NGL price risk at certain market locations. These commodity derivatives are generally valued using forward quotes provided by third-party pricing services that are validated with other market data. We believe any measurement uncertainty at December 31, 2021, is immaterial as our Level 3 fair value measurements are based on unadjusted pricing information from broker quotes and third-party pricing services.

Determining the appropriate classification of our fair value measurements within the fair value hierarchy requires management’s judgment regarding the degree to which market data is observable or corroborated by observable market data. We categorize derivatives based on the lowest level input that is significant to the fair value measurement in its entirety.

See Note B for our fair value measurements disclosures.

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DEBT DEBT (Policies)	12 Months Ended
	Dec. 31, 2021
Debt Instrument [Line Items]
Debt Policy	We amortize premiums, discounts and expenses incurred in connection with the issuance of long-term debt consistent with the terms of the respective debt instrument.

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EMPLOYEE BENEFIT PLANS EMPLOYEE BENEFIT PLANS (Policies)

12 Months Ended

Dec. 31, 2021

Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]

Investment, Policy [Policy Text Block]

Plan Assets - Our investment strategy is to invest plan assets in accordance with sound investment practices that emphasize long-term fundamentals. The goal of this strategy is to maximize investment returns while managing risk in order to meet the plan’s current and projected financial obligations. The investment allocation for our other postretirement benefit plans is to target a diversified mix of approximately 30% fixed income and 70% equity securities. The investment allocation for our defined benefit pension plan follows a glide path approach of liability-driven investing that shifts a higher portfolio weighting to fixed income as the plan’s funded status increases. The purpose of liability-driven investing is to structure the asset portfolio to more closely resemble the pension liability and thereby more effectively hedge against changes in the liability. The plan’s current investments include a diverse blend of various domestic and international equities, investments in various classes of debt securities, real estate and hedge funds. The target allocation for the assets of our retirement plan as of December 31, 2021, is as follows:

Domestic and international equities	42	%
Long duration fixed income	30	%
Return-seeking credit	11	%
Hedge funds	10	%
Real estate funds	7	%
Total	100	%

As part of our risk management for the plans, minimums and maximums have been set for each of the asset classes listed above.

Pension and Other Postretirement Plans, Policy [Policy Text Block]

Retirement and Other Postretirement Employee Benefits - We have defined benefit retirement plans covering certain employees and former employees. We sponsor welfare plans that provide postretirement medical and life insurance benefits to certain employees hired prior to 2017 who retire with at least five years of service. The expense and liability related to these plans is calculated using statistical and other factors that attempt to anticipate future events. These factors include assumptions about the discount rate, expected return on plan assets, rate of future compensation increases, mortality and employment length. In determining the projected benefit obligations and costs, assumptions can change from period to period and may result in changes in the costs and liabilities we recognize.

See Note K for our retirement and other postretirement employee benefits disclosures.

We determine our overall expected long-term rate of return on plan assets based on our review of historical returns and economic growth models.We determine our discount rates annually utilizing portfolios of high-quality bonds matched to the estimated benefit cash flows of our retirement and other postretirement benefit plans. Bonds selected to be included in the portfolios are only those rated by S&P or Moody’s as an AA or Aa2 rating or better and exclude callable bonds, bonds with less than a minimum issue size, yield outliers and other filtering criteria to remove unsuitable bonds.

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LEASES (Policies)	12 Months Ended
	Dec. 31, 2021
Leases [Abstract]
Lessee, Leases [Policy Text Block]	We lease certain buildings, warehouses, office space, pipeline capacity, land and equipment, including pipeline equipment, rail cars and information technology equipment. Our lease payments are generally straight-line and the exercise of lease renewal options, which vary in term, is at our sole discretion. We include renewal periods in a lease term if we are reasonably certain to exercise available renewal options. We apply the short-term policy election, which allows us to exclude from recognition leases with an initial term of 12 months or less. Our lease agreements do not include any residual value guarantees or material restrictive covenants.

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FAIR VALUE MEASUREMENTS (Tables)

12 Months Ended

Dec. 31, 2021

Fair Value Disclosures [Abstract]

Recurring Fair Value Measurements

The following tables set forth our recurring fair value measurements for the periods indicated:

	December 31, 2021
	Level 1		Level 2		Level 3		Total - Gross		Netting (a)		Total - Net
	(Thousands of dollars)
Derivative assets
Commodity contracts
Financial contracts	$	22,019	$	172,833	$	9,309	$	204,161	$	(204,161)	$	—
Total derivative assets	$	22,019	$	172,833	$	9,309	$	204,161	$	(204,161)	$	—
Derivative liabilities
Commodity contracts
Financial contracts	$	(67,226)	$	(112,922)	$	(123,592)	$	(303,740)	$	303,740	$	—
Interest-rate contracts	—		(145,524)		—		(145,524)		—		(145,524)
Total derivative liabilities	$	(67,226)	$	(258,446)	$	(123,592)	$	(449,264)	$	303,740	$	(145,524)

(a) - Derivative assets and liabilities are presented in our Consolidated Balance Sheet on a net basis. We net derivative assets and liabilities when a legally enforceable master-netting arrangement exists between the counterparty to a derivative contract and us. At December 31, 2021, we held no cash and posted $157.0 million of cash with various counterparties, including $99.6 million of cash collateral that is

offsetting derivative net liability positions under master-netting arrangements in the table above. The remaining $57.4 million of cash collateral in excess of derivative net liability positions is included in other current assets in our Consolidated Balance Sheet.

	December 31, 2020
	Level 1		Level 2		Level 3		Total - Gross		Netting (a)		Total - Net
	(Thousands of dollars)
Derivative assets
Commodity contracts
Financial contracts	$	6,697	$	—	$	103,801	$	110,498	$	(110,498)	$	—
Total derivative assets	$	6,697	$	—	$	103,801	$	110,498	$	(110,498)	$	—
Derivative liabilities
Commodity contracts
Financial contracts	$	(10,489)	$	—	$	(135,122)	$	(145,611)	$	145,611	$	—
Interest-rate contracts	—		(203,407)		—		(203,407)		—		(203,407)
Total derivative liabilities	$	(10,489)	$	(203,407)	$	(135,122)	$	(349,018)	$	145,611	$	(203,407)

(a) - Derivative assets and liabilities are presented in our Consolidated Balance Sheet on a net basis. We net derivative assets and liabilities when a legally enforceable master-netting arrangement exists between the counterparty to a derivative contract and us. At December 31, 2020, we held no cash and posted $63.1 million of cash with various counterparties, including $35.1 million of cash collateral that is offsetting derivative net liability positions under master-netting arrangements in the table above. The remaining $28.0 million of cash collateral in excess of derivative net liability positions is included in other current assets in our Consolidated Balance Sheet.

Reconciliation of Level 3 Fair Value Measurements

The following table sets forth a reconciliation of our Level 3 fair value measurements for the periods indicated:

	Years Ended
	December 31,
Derivative Assets (Liabilities)	2021		2020
	(Thousands of dollars)
Net assets (liabilities) at beginning of period	$	(31,321)	$	30,772
Total changes in fair value:
Settlements included in net income (a)	31,003		(31,660)
Transfers out of Level 3 derivatives	(59,911)		—
New Level 3 derivatives included in other comprehensive income (loss) (b)	(57,325)		(36,568)
Unrealized change included in other comprehensive income (loss) (b)	3,271		6,135
Net liabilities at end of period	$	(114,283)	$	(31,321)

(a) - Included in commodity sales revenues/cost of sales and fuel in our Consolidated Statements of Income.

(b) - Included in change in fair value of derivatives in our Consolidated Statements of Comprehensive Income.

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RISK MANAGEMENT AND HEDGING ACTIVITIES USING DERIVATIVES (Tables)

12 Months Ended

Dec. 31, 2021

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Fair Value of Derivatives

The following table sets forth the fair values of our derivative instruments presented on a gross basis for the periods indicated:

		December 31, 2021				December 31, 2020
	Location in our Consolidated Balance Sheets	Assets		(Liabilities)		Assets		(Liabilities)
		(Thousands of dollars)
Derivatives designated as hedging instruments
Commodity contracts (a)
Financial contracts (b)		$	204,161	$	(303,740)	$	107,461	$	(142,573)
Interest-rate contracts	Other current liabilities	—		(145,524)		—		—
	Other deferred credits	—		—		—		(203,407)
Total derivatives designated as hedging instruments		204,161		(449,264)		107,461		(345,980)
Derivatives not designated as hedging instruments
Commodity contracts (a)
Financial contracts (b)		—		—		3,037		(3,038)
Total derivatives not designated as hedging instruments		—		—		3,037		(3,038)
Total derivatives		$	204,161	$	(449,264)	$	110,498	$	(349,018)

(a) - Derivative assets and liabilities are presented in our Consolidated Balance Sheets on a net basis when a legally enforceable master-netting arrangement exists between the counterparty to a derivative contract and us.

(b) - At December 31, 2021, and December 31, 2020, our derivative net liability positions under master-netting arrangements for financial contracts were fully offset by cash collateral of $99.6 million and $35.1 million, respectively.

Notional Amounts of Derivative Instruments

The following table sets forth the notional quantities for derivative instruments held for the periods indicated:

		December 31, 2021		December 31, 2020
	Contract Type	Net Purchased/Payor (Sold/Receiver)
Derivatives designated as hedging instruments: (a)
Cash flow hedges
Fixed price
-Natural gas (Bcf)	Futures	(32.3)		(43.3)
-Crude oil and NGLs (MMBbl)	Futures	(10.0)		(4.6)
Basis
-Natural gas (Bcf)	Futures	(30.5)		(43.3)
Interest-rate contracts (Billions of dollars)	Swaps	$	1.1	$	1.1

(a) - Notional amounts for derivatives not designated as hedging instruments are excluded from the table above due to fully offsetting notional quantities of 0.8 MMBbl for NGLs fixed priced derivative instruments at December 31, 2020.

Schedule of Cash Flow Hedging Instruments Effect on Comprehensive Income (Loss)

The following table sets forth the unrealized change in fair value of cash flow hedges in other comprehensive income (loss) for the periods indicated:

	Years Ended December 31,
	2021		2020		2019
	(Thousands of dollars)
Commodity contracts	$	(322,648)	$	(5,699)	$	38,819
Interest-rate contracts	57,884		(208,616)		(230,771)
Total unrealized change in fair value of cash flow hedges in other comprehensive income (loss)	$	(264,764)	$	(214,315)	$	(191,952)

Schedule of Cash Flow Hedging Instruments Effect on Income

The following table sets forth the effect of cash flow hedges on net income for the periods indicated:

Derivatives in Cash Flow Hedging Relationships	Location of Gain (Loss) Reclassified from Accumulated Other Comprehensive Loss into Net Income
		Years Ended December 31,
		2021		2020		2019
		(Thousands of dollars)
Commodity contracts	Commodity sales revenues	$	(731,793)	$	85,436	$	94,547
	Cost of sales and fuel	473,612		(19,170)		(44,202)
Interest-rate contracts (a)	Interest expense	(39,952)		(93,676)		(23,230)
Total change in fair value of cash flow hedges reclassified from accumulated other comprehensive loss into net income on derivatives		$	(298,133)	$	(27,410)	$	27,115

(a) - The year ended December 31, 2020, includes a loss of $48.3 million on the settlement of $1.3 billion of interest-rate swaps used to hedge our LIBOR-based interest payments.

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PROPERTY, PLANT AND EQUIPMENT (Tables)

12 Months Ended

Dec. 31, 2021

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment by Property Type

The following table sets forth our property, plant and equipment by property type, for the periods indicated:

	Estimated Useful Lives (Years)	December 31, 2021		December 31, 2020
		(Thousands of dollars)
Nonregulated
Gathering pipelines and related equipment	5 to 40	$	4,371,936	$	4,143,752
Processing and fractionation and related equipment	3 to 40	5,356,508		5,084,802
Storage and related equipment	3 to 54	874,522		798,785
Transmission pipelines and related equipment	5 to 54	886,343		810,434
General plant and other	2 to 60	695,117		647,675
Construction work in process	—	1,132,961		1,265,736
Regulated
Storage and related equipment	5 to 25	9,197		9,180
Natural gas transmission pipelines and related equipment	5 to 77	1,660,034		1,569,268
NGL transmission pipelines and related equipment	5 to 88	8,595,968		8,423,544
General plant and other	2 to 50	73,449		72,535
Construction work in process	—	164,504		247,224
Property, plant and equipment		23,820,539		23,072,935
Accumulated depreciation and amortization - nonregulated		(2,885,020)		(2,514,328)
Accumulated depreciation and amortization - regulated		(1,615,645)		(1,403,679)
Net property, plant and equipment		$	19,319,874	$	19,154,928

Average Depreciation Rates for Regulated Property

The average depreciation rates for our regulated property are set forth, by segment, in the following table for the periods indicated:

	Years Ended December 31,
	2021	2020	2019
Natural Gas Liquids	2.2%	2.2%	2.0%
Natural Gas Pipelines	2.1%	2.1%	2.1%

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GOODWILL AND INTANGIBLE ASSETS (Tables)

12 Months Ended

Dec. 31, 2021

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill by Segment

The following table sets forth our goodwill, by segment, for the periods indicated:

	December 31, 2021		December 31, 2020
	(Thousands of dollars)
Natural Gas Liquids	$	371,217	$	371,217
Natural Gas Pipelines	156,375		156,375
Total goodwill	$	527,592	$	527,592

Gross Carrying Amount and Accumulated Amortization of Intangible Assets

The following table reflects the gross carrying amount and accumulated amortization of intangible assets for the periods presented:

	December 31, 2021		December 31, 2020
	(Thousands of dollars)
Gross intangible assets	$	381,435	$	381,435
Accumulated amortization	(145,732)		(135,304)
Net intangible assets	$	235,703	$	246,131

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DEBT (Tables)

12 Months Ended

Dec. 31, 2021

Long-term Debt, Unclassified [Abstract]

Debt

The following table sets forth our consolidated debt for the periods indicated:

	December 31, 2021		December 31, 2020
	(Thousands of dollars)
Commercial paper outstanding	$	—	$	—
Senior unsecured obligations:
$700,000 at 4.25% due February 2022	—		541,877
$900,000 at 3.375% due October 2022	895,814		895,814
$425,000 at 5.0% due September 2023	425,000		425,000
$500,000 at 7.5% due September 2023	500,000		500,000
$500,000 at 2.75% due September 2024	500,000		500,000
$500,000 at 4.9% due March 2025	500,000		500,000
$400,000 at 2.2% due September 2025	387,000		387,000
$600,000 at 5.85% due January 2026	600,000		600,000
$500,000 at 4.0% due July 2027	500,000		500,000
$800,000 at 4.55% due July 2028	800,000		800,000
$100,000 at 6.875% due September 2028	100,000		100,000
$700,000 at 4.35% due March 2029	700,000		700,000
$750,000 at 3.4% due September 2029	714,251		714,251
$850,000 at 3.1% due March 2030	780,093		780,093
$600,000 at 6.35% due January 2031	600,000		600,000
$400,000 at 6.0% due June 2035	400,000		400,000
$600,000 at 6.65% due October 2036	600,000		600,000
$600,000 at 6.85% due October 2037	600,000		600,000
$650,000 at 6.125% due February 2041	650,000		650,000
$400,000 at 6.2% due September 2043	400,000		400,000
$700,000 at 4.95% due July 2047	689,006		689,006
$1,000,000 at 5.2% due July 2048	1,000,000		1,000,000
$750,000 at 4.45% due September 2049	672,530		713,676
$500,000 at 4.5% due March 2050	443,015		451,270
$300,000 at 7.15% due January 2051	300,000		300,000
Guardian Pipeline
Weighted average 7.85% due December 2022	—		13,657
Total debt	13,756,709		14,361,644
Unamortized portion of terminated swaps	11,596		13,314
Unamortized debt issuance costs and discounts	(124,855)		(138,887)
Current maturities of long-term debt	(895,814)		(7,650)
Short-term borrowings (a)	—		—
Long-term debt	$	12,747,636	$	14,228,421

(a) - Individual issuances of commercial paper under our commercial paper program generally mature in 90 days or less.

Aggregate maturities of long-term debt outstanding

The aggregate maturities of long-term debt outstanding and interest obligations on debt as of December 31, 2021, for the years 2022 through 2026 are shown below:

	Senior Unsecured Obligations		Interest Obligations on Debt		Total
	(Millions of dollars)
2022	$	895.8	$	670.5	$	1,566.3
2023	$	925.0	$	629.3	$	1,554.3
2024	$	500.0	$	584.6	$	1,084.6
2025	$	887.0	$	553.6	$	1,440.6
2026	$	600.0	$	508.8	$	1,108.8

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EQUITY (Tables)

12 Months Ended

Dec. 31, 2021

Equity [Abstract]

Quarterly dividends per share paid on common stock

The following table sets forth the quarterly dividends per share paid on our common stock in the periods indicated:

	Years Ended December 31,
	2021		2020		2019
First Quarter	$	0.935	$	0.935	$	0.860
Second Quarter	0.935		0.935		0.865
Third Quarter	0.935		0.935		0.890
Fourth Quarter	0.935		0.935		0.915
Total	$	3.74	$	3.74	$	3.53

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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Tables)

12 Months Ended

Dec. 31, 2021

Accumulated Other Comprehensive Loss

The following table sets forth the balance in accumulated other comprehensive loss for the periods indicated:

	Risk- Management Assets/Liabilities (a)		Retirement and Other Postretirement Benefit Plan Obligations (a) (b)		Risk- Management Assets/Liabilities of Unconsolidated Affiliates (a)		Accumulated Other Comprehensive Loss (a)
	(Thousands of dollars)
January 1, 2020	$	(233,520)	$	(131,481)	$	(8,999)	$	(374,000)
Other comprehensive loss before reclassifications	(165,023)		(40,341)		(8,635)		(213,999)
Amounts reclassified to net income (c)	21,097		14,187		1,266		36,550
Other comprehensive loss	(143,926)		(26,154)		(7,369)		(177,449)
December 31, 2020	(377,446)		(157,635)		(16,368)		(551,449)
Other comprehensive income (loss) before reclassifications	(203,868)		31,897		3,088		(168,883)
Amounts reclassified to net income (c)	228,999		18,079		1,903		248,981
Other comprehensive income	25,131		49,976		4,991		80,098
December 31, 2021	$	(352,315)	$	(107,659)	$	(11,377)	$	(471,351)

(a) - All amounts are presented net of tax.

(b) - Includes amounts related to supplemental executive retirement plan.

(c) - See Note C for details of amounts reclassified to net income for risk-management assets/liabilities and Note K for retirement and other postretirement benefit plan obligations.

Schedule of Accumulated Other Comprehensive Loss for Risk-Management Assets/Liabilities [Table Text Block]

The following table sets forth information about the balance of accumulated other comprehensive loss at December 31, 2021, representing unrealized losses related to risk-management assets and liabilities:

	Risk- Management Assets/Liabilities (a)
	(Thousands of dollars)
Commodity derivative instruments expected to be realized within the next 36 months (b)	$	(76,942)
Settled interest-rate swaps to be recognized over the life of the long-term, fixed-rate debt (c)	(163,320)
Interest-rate swaps with future settlement dates expected to be amortized over the life of long-term debt	(112,053)
Accumulated other comprehensive loss at December 31, 2021	$	(352,315)

(a) - All amounts are presented net of tax.

(b) - Based on commodity prices on December 31, 2021, we expect net losses of $76.8 million, net of tax, will be reclassified into earnings during the next 12 months.

(c) - We expect net losses of $27.1 million, net of tax, will be reclassified into earnings during the next 12 months.

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EARNINGS PER SHARE EARNINGS PER SHARE (Tables)

12 Months Ended

Dec. 31, 2021

Earnings Per Share [Abstract]

Earnings Per Share

The following tables set forth the computation of basic and diluted EPS for the periods indicated:

	Year Ended December 31, 2021
	Income		Shares	Per Share Amount
	(Thousands, except per share amounts)
Basic EPS
Net income available for common stock	$	1,498,606	446,403	$	3.36
Diluted EPS
Effect of dilutive securities	—		1,000
Net income available for common stock and common stock equivalents	$	1,498,606	447,403	$	3.35

	Year Ended December 31, 2020
	Income		Shares	Per Share Amount
	(Thousands, except per share amounts)
Basic EPS
Net income available for common stock	$	611,709	431,105	$	1.42
Diluted EPS
Effect of dilutive securities	—		677
Net income available for common stock and common stock equivalents	$	611,709	431,782	$	1.42

	Year Ended December 31, 2019
	Income		Shares	Per Share Amount
	(Thousands, except per share amounts)
Basic EPS
Net income available for common stock	$	1,277,477	413,560	$	3.09
Diluted EPS
Effect of dilutive securities	—		1,884
Net income available for common stock and common stock equivalents	$	1,277,477	415,444	$	3.07

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SHARE-BASED PAYMENTS SHARE-BASED PAYMENTS (Tables)

12 Months Ended

Dec. 31, 2021

Restricted Stock Units Activity

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Schedule of Share-based Compensation, Activity

The following tables set forth activity and various statistics for our restricted stock unit awards:

	Number of Units	Weighted Average Price
Nonvested December 31, 2020	646,287	$	63.85
Granted	417,212	$	46.84
Released to participants	(242,765)	$	51.57
Forfeited	(40,797)	$	55.27
Nonvested December 31, 2021	779,937	$	59.02

	2021		2020		2019
Weighted-average grant date fair value (per share)	$	46.84	$	76.49	$	58.07
Fair value of units granted (thousands of dollars)	$	19,542	$	16,552	$	15,238
Grant date fair value of units vested (thousands of dollars)	$	12,519	$	11,204	$	10,691

Performance-Unit Activity

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Schedule of Share-based Compensation, Activity

The following tables set forth activity and various statistics related to the performance unit awards and the assumptions used in the valuations at the respective grant dates:

	Number of Units	Weighted Average Price
Nonvested December 31, 2020	834,246	$	75.96
Granted	542,183	$	62.03
Released to participants	(311,907)	$	64.00
Forfeited	(87,937)	$	68.37
Nonvested December 31, 2021	976,585	$	72.73

	2021	2020	2019
Volatility (a)	60.30%	21.70%	27.10%
Dividend yield	8.13%	4.87%	5.05%
Risk-free interest rate	0.21%	1.39%	2.47%

(a) - Volatility was based on historical volatility over three years using daily stock price observations.

	2021		2020		2019
Weighted-average grant date fair value (per share)	$	62.03	$	88.43	$	68.02
Fair value of units granted (thousands of dollars)	$	33,632	$	25,028	$	23,020
Grant date fair value of units vested (thousands of dollars)	$	19,962	$	17,722	$	15,018

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EMPLOYEE BENEFIT PLANS EMPLOYEE BENEFIT PLANS (Tables)

12 Months Ended

Dec. 31, 2021

Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]

Pension and postretirement benefit plans obligations and fair value of plan assets

The following table sets forth our retirement and other postretirement benefit plans benefit obligations and fair value of plan assets for the periods indicated:

	Retirement Benefits				Other Postretirement Benefits
	December 31,				December 31,
	2021		2020		2021		2020
Change in benefit obligation	(Thousands of dollars)
Benefit obligation, beginning of period	$	583,072	$	534,849	$	54,515	$	52,309
Service cost	8,314		8,154		421		460
Interest cost	16,900		18,318		1,454		1,771
Plan participants’ contributions	—		—		1,092		1,032
Actuarial loss (gain)	(22,792)		37,951		(2,496)		2,860
Benefits paid	(18,483)		(16,200)		(3,959)		(3,917)
Benefit obligation, end of period (b)	567,011		583,072		51,027		54,515
Change in plan assets
Fair value of plan assets, beginning of period	379,092		346,792		20,874		39,060
Actual return on plan assets (a)	41,374		36,400		5,919		(15,699)
Employer contributions	11,200		12,100		—		—
Plan participants’ contributions	—		—		1,092		1,032
Benefits paid	(18,483)		(16,200)		(3,488)		(3,519)
Fair value of plan assets, end of period (c)	413,183		379,092		24,397		20,874
Balance at December 31	$	(153,828)	$	(203,980)	$	(26,630)	$	(33,641)
Current liabilities	$	(5,219)	$	(4,679)	$	—	$	—
Noncurrent liabilities	(148,609)		(199,301)		(26,630)		(33,641)
Balance at December 31	$	(153,828)	$	(203,980)	$	(26,630)	$	(33,641)

(a) - Other Postretirement Benefits for the year ended December 31, 2020, includes a $13.2 million tax loss incurred from the exit of an investment in an insurance contract.

(b) - The benefit obligation for Retirement Benefits at December 31, 2021 and 2020, include the supplemental executive retirement plan obligation.

(c) - Fair value of plan assets for Retirement Benefits exclude the assets of our supplemental executive retirement plan, which totaled $111.2 million and $116.2 million at December 31, 2021 and 2020, respectively, and are included in other assets on the Consolidated Balance Sheets. These assets are maintained in a rabbi trust and are not treated as assets of the supplemental executive retirement plan.

Components of net periodic benefit cost for pension and postretirement benefit plans

The following table sets forth the components of net periodic benefit cost for our retirement and other postretirement benefit plans for the periods indicated:

	Retirement Benefits						Other Postretirement Benefits
	Years Ended December 31,						Years Ended December 31,
	2021		2020		2019		2021		2020		2019
	(Thousands of dollars)
Components of net periodic benefit cost
Service cost	$	8,314	$	8,154	$	7,825	$	421	$	460	$	468
Interest cost	16,900		18,318		20,528		1,454		1,771		2,038
Expected return on plan assets	(25,109)		(24,964)		(23,600)		(1,364)		(2,894)		(2,285)
Amortization of prior service cost (credit)	114		114		—		—		—		(227)
Amortization of net loss	19,673		18,306		12,649		3,692		5		297
Net periodic benefit cost (income)	$	19,892	$	19,928	$	17,402	$	4,203	$	(658)	$	291

Amounts recognized in other comprehensive income (loss)

The following table sets forth the amounts recognized in other comprehensive income (loss) related to our retirement and other postretirement benefits for the periods indicated:

	Retirement Benefits						Other Postretirement Benefits
	Years Ended December 31,						Years Ended December 31,
	2021		2020		2019		2021		2020		2019
	(Thousands of dollars)
Net gain (loss) (a)	$	34,529	$	(31,016)	$	(25,389)	$	7,052	$	(21,453)	$	700
Prior service cost	—		—		(601)		—		—		—
Amortization of prior service cost (credit) (b)	114		114		—		—		—		(227)
Amortization of net loss (b)	19,673		18,306		12,649		3,692		5		297
Deferred income taxes	(12,493)		2,897		3,068		(2,471)		4,933		(177)
Total recognized in other comprehensive income (loss)	$	41,823	$	(9,699)	$	(10,273)	$	8,273	$	(16,515)	$	593

(a) - Other Postretirement Benefits for the year ended December 31, 2020, includes a $13.2 million tax loss incurred from the exit of an investment in an insurance contract.

(b) - These components are recognized in accumulated other comprehensive loss and are reclassified to other expense in our Consolidated Statements of Income, with related income tax benefits of $5.4 million, $4.2 million and $2.9 million reclassified to income tax expense for the years ended December 31, 2021, 2020 and 2019, respectively.

Amounts in accumulated other comprehensive income (loss)

The table below sets forth the amounts in accumulated other comprehensive loss that had not yet been recognized as components of net periodic benefit expense for the periods indicated:

	Retirement Benefits				Other Postretirement Benefits
	December 31,				December 31,
	2021		2020		2021		2020
	(Thousands of dollars)
Prior service cost	$	(374)	$	(487)	$	—	$	—
Accumulated loss (a)	(131,460)		(185,662)		(14,815)		(25,558)
Accumulated other comprehensive loss	(131,834)		(186,149)		(14,815)		(25,558)
Deferred income taxes	36,759		49,251		3,852		6,322
Accumulated other comprehensive loss, net of tax	$	(95,075)	$	(136,898)	$	(10,963)	$	(19,236)

(a) - Other Postretirement Benefits for the year ended December 31, 2020, includes a $13.2 million tax loss incurred from the exit of an investment in an insurance contract.

Weighted-average assumptions used to determine benefit obligations and net periodic benefit costs

The following table sets forth the weighted-average assumptions used to determine benefit obligations for retirement and other postretirement benefits for the periods indicated:

	Retirement Benefits		Other Postretirement Benefits
	December 31,		December 31,
	2021	2020	2021	2020
Discount rate	3.25%	3.00%	3.00%	2.75%
Compensation increase rate	3.60%	3.60%	NA	NA

The following table sets forth the weighted-average assumptions used to determine net periodic benefit costs for the periods indicated:

	Years Ended December 31,
	2021	2020	2019
Discount rate - retirement plans	3.00%	3.50%	4.50%
Discount rate - other postretirement plans	2.75%	3.50%	4.50%
Expected long-term return on plan assets	7.00%	7.50%	7.50%
Compensation increase rate	3.60%	3.70%	3.65%

Assumed health care cost trend rates

The following table sets forth the assumed health care cost-trend rates for the periods indicated:

	2021	2020
Health care cost-trend rate assumed for next year	6.50%	6.50%
Rate to which the cost-trend rate is assumed to decline (the ultimate trend rate)	5.00%	5.00%
Year that the rate reaches the ultimate trend rate	2025	2024

Schedule of allocation of plan assets

The target allocation for the assets of our retirement plan as of December 31, 2021, is as follows:

Domestic and international equities	42	%
Long duration fixed income	30	%
Return-seeking credit	11	%
Hedge funds	10	%
Real estate funds	7	%
Total	100	%

As part of our risk management for the plans, minimums and maximums have been set for each of the asset classes listed above.

The following tables set forth the plan assets by fair value category as of the measurement date for our defined benefit pension and other postretirement benefit plans:

	Pension Benefits
	December 31, 2021
Asset Category	Level 1		Level 2		Level 3		Subtotal		Measured at NAV (d)		Total
	(Thousands of dollars)
Investments:
Equity securities	$	42	$	—	$	—	$	42	$	—	$	42
Common/collective trusts
Equity securities (a)	—		—		—		—		166,132		166,132
Real estate funds	—		—		—		—		30,491		30,491
Government obligations	—		—		—		—		49,444		49,444
Corporate obligations (b)	—		—		—		—		120,877		120,877
Short-term investments	—		—		—		—		4,243		4,243
Other investments (c)	—		—		—		—		41,954		41,954
Fair value of plan assets	$	42	$	—	$	—	$	42	$	413,141	$	413,183

(a) - This category represents securities of the respective market sector from diverse industries.

(b) - This category represents bonds from diverse industries.

(c) - This category represents alternative investments in limited partnerships, which can be redeemed with a 30-day notice with no further restrictions. There are no unfunded capital commitments. These limited partnerships invest through multi-strategy programs in broadly diversified portfolios of private investment funds, hedge funds and/or separate accounts to seek equity-like returns with low market correlation, reduced volatility and limited risk.

(d) - Plan asset investments measured at fair value using the net asset value per share.

	Pension Benefits
	December 31, 2020
Asset Category	Level 1		Level 2		Level 3		Subtotal		Measured at NAV (d)		Total
	(Thousands of dollars)
Investments:
Equity securities	$	43	$	—	$	—	$	43	$	—	$	43
Common/collective trusts
Equity securities (a)	—		—		—		—		164,099		164,099
Real estate funds	—		—		—		—		24,134		24,134
Government obligations	—		—		—		—		45,237		45,237
Corporate obligations (b)	—		—		—		—		101,626		101,626
Short-term investments (e)	—		—		—		—		4,890		4,890
Other investments (c)	—		—		—		—		39,063		39,063
Fair value of plan assets	$	43	$	—	$	—	$	43	$	379,049	$	379,092

(a) - This category represents securities of the respective market sector from diverse industries.

(b) - This category represents bonds from diverse industries.

(c) - This category represents alternative investments in limited partnerships, which can be redeemed with a 30-day notice with no further restrictions. There are no unfunded capital commitments. These limited partnerships invest through multi-strategy programs in broadly diversified portfolios of private investment funds, hedge funds and/or separate accounts to seek equity-like returns with low market correlation, reduced volatility and limited risk.

(d) - Plan asset investments measured at fair value using the net asset value per share.

(e) - The fair value of short term investments in the Bank of New York Mellon EB Temporary Investment Fund was previously reported in Level 2. We elected to consistently apply the practical expedient to all investments within common/collective trusts, and therefore, the fair value of this fund is now measured at net asset value per share and no longer classified in the fair value hierarchy.

	Other Postretirement Benefits
	December 31, 2021
Asset Category	Level 1		Level 2		Level 3		Total
	(Thousands of dollars)
Investments:
Equity securities (a)	$	17,953	$	—	$	—	$	17,953
Money market funds	—		480		—		480
Municipal obligations	5,964		—		—		5,964
Fair value of plan assets	$	23,917	$	480	$	—	$	24,397

(a) - This category represents securities of the respective market sector from diverse industries.

	Other Postretirement Benefits
	December 31, 2020
Asset Category	Level 1		Level 2		Level 3		Total
	(Thousands of dollars)
Investments:
Equity securities (a)(b)	$	15,116	$	—	$	—	$	15,116
Money market funds	—		808		—		808
Municipal obligations (b)	4,950		—		—		4,950
Fair value of plan assets	$	20,066	$	808	$	—	$	20,874

(a) - This category represents securities of the respective market sector from diverse industries.

(b) - Net proceeds of $16.2 million from the exit of an investment in an insurance contract were reinvested in various equity securities and municipal obligations.

Pension benefits and postretirement benefit payments expected to be paid

The following table sets forth the defined benefit pension and other postretirement benefits payments expected to be paid in 2022 through 2031:

	Pension Benefits		Other Postretirement Benefits
Benefits to be paid in:	(Thousands of dollars)
2022	$	25,962	$	3,387
2023	$	26,756	$	3,363
2024	$	27,769	$	3,302
2025	$	28,759	$	3,293
2026	$	29,651	$	3,220
2027 through 2031	$	156,041	$	15,339

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INCOME TAXES (Tables)

12 Months Ended

Dec. 31, 2021

Income Tax Disclosure [Abstract]

Provision for Income Taxes

The following table sets forth our provision for income taxes for the periods indicated:

	Years Ended December 31,
	2021		2020		2019
	(Thousands of dollars)
Current tax expense (benefit)
Federal	$	2,897	$	980	$	(1,278)
State	9,544		1,797		963
Total current tax expense (benefit)	12,441		2,777		(315)
Deferred tax expense
Federal	433,469		154,068		327,806
State	38,588		32,662		44,923
Total deferred tax expense	472,057		186,730		372,729
Total provision for income taxes	$	484,498	$	189,507	$	372,414

Reconciliation of Income Tax Provision

The following table is a reconciliation of our income tax provision for the periods indicated:

	Years Ended December 31,
	2021			2020			2019
	(Thousands of dollars)
Income before income taxes	$	1,984,204		$	802,316		$	1,650,991
Federal statutory income tax rate	21.0		%	21.0		%	21.0		%
Provision for federal income taxes	416,683			168,486			346,708
State income taxes, net of federal benefit	40,092			13,580			34,545
Deferred tax rate change, inclusive of valuation allowance	6,350			20,879			11,340
Excess tax benefits from share-based compensation	(1,968)			(7,380)			(20,983)
Other, net (a)	23,341			(6,058)			804
Income tax provision	$	484,498		$	189,507		$	372,414

(a) The year ended December 31, 2021, includes $19.4 million impact from previously recognized gains on certain benefit plan investments.

Schedule of Deferred Tax Assets and Liabilities

The following table sets forth the tax effects of temporary differences that gave rise to significant portions of the deferred tax assets and liabilities for the periods indicated:

	December 31, 2021		December 31, 2020
Deferred tax assets	(Thousands of dollars)
Employee benefits and other accrued liabilities	$	95,952	$	96,741
Federal net operating loss	1,337,050		1,473,093
State net operating loss and benefits	216,181		258,929
Derivative instruments	118,063		134,499
Other	4,863		12,894
Total deferred tax assets	1,772,109		1,976,156
Valuation allowance for state net operating loss and tax credits
Carryforward expected to expire prior to utilization	(84,755)		(121,212)
Net deferred tax assets	1,687,354		1,854,944
Deferred tax liabilities
Excess of tax over book depreciation	84,692		87,021
Investment in partnerships (a)	2,769,352		2,437,620
Total deferred tax liabilities	2,854,044		2,524,641
Net deferred tax assets (liabilities)	$	(1,166,690)	$	(669,697)

(a) Due primarily to excess of tax over book depreciation.

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UNCONSOLIDATED AFFILIATES (Tables)

12 Months Ended

Dec. 31, 2021

Schedule of Equity Method Investments [Line Items]

Schedule of Equity Method Investments

The following table sets forth our investments in unconsolidated affiliates for the periods indicated:

	Net Ownership Interest	December 31, 2021		December 31, 2020
		(Thousands of dollars)
Northern Border Pipeline	50%	$	283,170	$	291,987
Overland Pass Pipeline	50%	403,011		409,573
Roadrunner	50%	70,777		66,794
Other (a)	Various	40,655		36,678
Investments in unconsolidated affiliates (b)		$	797,613	$	805,032

(a) - Year ended December 31, 2020, includes the impact of noncash impairment charges of $37.7 million related to the equity investments discussed below, offset partially by an acquisition of an additional equity interest for $20.0 million.

(b) - Equity-method goodwill (Note A) was $16.5 million at December 31, 2021 and 2020.

Equity In Net Earnings From Investments

Schedule of Equity Method Investments [Line Items]

Schedule of Equity Method Investments

The following table sets forth our equity in net earnings (loss) from investments for the periods indicated:

	Years Ended December 31,
	2021		2020		2019
	(Thousands of dollars)
Northern Border Pipeline	$	64,470	$	75,409	$	68,871
Overland Pass Pipeline	19,434		38,618		63,698
Roadrunner	33,293		29,017		26,839
Other	5,323		197		(4,867)
Equity in net earnings from investments	$	122,520	$	143,241	$	154,541
Impairment of equity investments	$	—	$	(37,730)	$	—

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COMMITMENTS AND CONTINGENCIES (Tables)

12 Months Ended

Dec. 31, 2021

Commitments and Contingencies Disclosure [Abstract]

Future Minimum Rental Payments for Firm Transportation, Storage Contracts and Capital Leases

The following table sets forth our firm transportation and storage contract payments for the periods indicated:

	Firm Transportation and Storage Contracts
	(Millions of dollars)
2022	$	72.3
2023	63.1
2024	59.3
2025	53.9
2026	40.8
Thereafter	211.6
Total	$	501.0

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LEASES (Tables)

12 Months Ended

Dec. 31, 2021

Leases [Abstract]

Lessee, Operating Lease, Liability, Maturity [Table Text Block]

The following table sets forth the maturity of our lease liabilities as of December 31, 2021:

	Finance Lease		Operating Leases
	(Millions of dollars)
2022	$	4.7	$	16.4
2023	4.7		13.9
2024	4.7		12.6
2025	5.4		11.2
2026	4.5		11.4
2027 and beyond	8.3		36.9
Total lease payments	32.3		102.4
Less: Interest	8.6		13.0
Present value of lease liabilities	$	23.7	$	89.4

LeaseAssetsAndLiabilitiesInBalanceSheet [Table Text Block]

The following table sets forth information about our lease assets and liabilities included in our Consolidated Balance Sheet for the periods indicated:

Leases	Location in our Consolidated Balance Sheet	December 31, 2021		December 31, 2020
		(Thousands of dollars)
Assets
Operating leases	Other assets	$	89,558	$	100,154
Finance lease	Property, plant and equipment	29,962		28,286
Finance lease	Accumulated depreciation	(3,590)		(2,451)
Total leased assets		$	115,930	$	125,989
Liabilities
Current
Operating leases	Operating lease liability	$	13,783	$	13,610
Finance lease	Other current liabilities	2,584		2,153
Noncurrent
Operating leases	Operating lease liability	75,636		87,610
Finance lease	Other deferred credits	21,082		22,143
Total lease liabilities		$	113,085	$	125,516

The following table sets forth supplemental cash flow information related to our leases:

	Years Ended December 31,
	2021		2020
	(Thousands of dollars)
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows for operating leases	$	15,690	$	13,245
Financing cash flows for finance lease	$	2,307	$	1,949
Right-of-use assets obtained in exchange for operating lease liabilities (noncash) (a)	$	1,150	$	99,547

(a) - In December 2019, we entered into an operating lease for pipeline capacity with a lease term of 10 years that commenced January 1, 2020. In connection with this lease, we recognized an operating lease right-of-use asset and a lease liability with remaining balances of $69.0 million and $69.9 million, respectively, as of December 31, 2020.

Lease, Cost [Table Text Block]

The following table sets forth information about our lease costs for the periods indicated:

		Years Ended December 31,
	Location in our Consolidated Statement of Income	2021		2020
		(Thousands of dollars)
Operating leases	Operations and maintenance	$	17,747	$	17,162
Finance lease
Amortization of lease assets	Depreciation and amortization	1,139		1,131
Interest on lease liabilities	Interest expense	2,338		2,537
Total lease cost		$	21,224	$	20,830

The following table sets forth information about our leases for the periods indicated:

	December 31, 2021	December 31, 2020
Weighted average remaining lease term (years)
Operating leases	7.8	8.3
Finance lease	6.6	7.8
Weighted average discount rate (a)
Operating leases	3.40%	3.20%
Finance lease	9.60%	10.00%

(a) - Our weighted-average discount rates represent the rate implicit in the lease or our incremental borrowing rate for a term equal to the remaining term of the lease.

Finance Lease, Liability, Maturity [Table Text Block]

The following table sets forth the maturity of our lease liabilities as of December 31, 2021:

	Finance Lease		Operating Leases
	(Millions of dollars)
2022	$	4.7	$	16.4
2023	4.7		13.9
2024	4.7		12.6
2025	5.4		11.2
2026	4.5		11.4
2027 and beyond	8.3		36.9
Total lease payments	32.3		102.4
Less: Interest	8.6		13.0
Present value of lease liabilities	$	23.7	$	89.4

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REVENUES (Tables)

12 Months Ended

Dec. 31, 2021

Revenue from Contract with Customer [Abstract]

Contract with Customer, Asset and Liability [Table Text Block]

The following table sets forth the balances in contract liabilities for the periods indicated:

Contract Liabilities	(Millions of dollars)
Balance at January 1, 2020	$	57.1
Revenue recognized included in beginning balance (c)	(36.1)
Net additions	20.4
Balance at December 31, 2020 (a)	41.4
Revenue recognized included in beginning balance	(23.7)
Net additions	33.8
Balance at December 31, 2021 (b)	$	51.5

(a) - Contract liabilities of $23.7 million and $17.7 million are included in other current liabilities and other deferred credits, respectively, in our Consolidated Balance Sheet.

(b) - Contract liabilities of $35.3 million and $16.2 million are included in other current liabilities and other deferred credits, respectively, in our Consolidated Balance Sheet.

(c) - Includes a contract settlement of revenue previously deferred.

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table Text Block]

The following table presents aggregate value allocated to unsatisfied performance obligations as of December 31, 2021, and the amounts we expect to recognize in revenue in future periods, related primarily to firm transportation and storage contracts with remaining contract terms ranging from one month to 22 years:

Expected Period of Recognition in Revenue	(Millions of dollars)
2022	$	339.1
2023	288.2
2024	238.1
2025	162.7
2026 and beyond	781.3
Total estimated transaction price allocated to unsatisfied performance obligations	$	1,809.4

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SEGMENTS (Tables)

12 Months Ended

Dec. 31, 2021

Segment Reporting, Disclosure of Entity's Reportable Segments [Abstract]

Segments

The following tables set forth certain selected financial information for our operating segments for the periods indicated:

Year Ended December 31, 2021	Natural Gas Gathering and Processing		Natural Gas Liquids (a)		Natural Gas Pipelines (b)		Total Segments
	(Thousands of dollars)
NGL and condensate sales	$	2,821,175	$	13,653,120	$	—	$	16,474,295
Residue natural gas sales	1,483,898		—		115,495		1,599,393
Gathering, processing and exchange services revenue	135,501		517,758		—		653,259
Transportation and storage revenue	—		179,619		490,498		670,117
Other	20,965		41,376		910		63,251
Total revenues (c)	4,461,539		14,391,873		606,903		19,460,315
Cost of sales and fuel (exclusive of depreciation and operating costs)	(3,226,078)		(11,939,661)		(11,236)		(15,176,975)
Operating costs	(367,390)		(528,084)		(170,257)		(1,065,731)
Equity in net earnings from investments	3,757		21,000		97,763		122,520
Noncash compensation expense and other	17,299		18,511		4,637		40,447
Segment adjusted EBITDA	$	889,127	$	1,963,639	$	527,810	$	3,380,576
Depreciation and amortization	$	(260,011)	$	(298,937)	$	(58,702)	$	(617,650)
Investments in unconsolidated affiliates	$	27,018	$	416,648	$	353,947	$	797,613
Total assets	$	6,768,955	$	14,502,372	$	2,143,307	$	23,414,634
Capital expenditures	$	275,165	$	306,949	$	92,617	$	674,731

(a) - Our Natural Gas Liquids segment has regulated and nonregulated operations. Our Natural Gas Liquids segment’s regulated operations had revenues of $2.4 billion, of which $2.2 billion related to revenues within the segment, and cost of sales and fuel of $607.5 million.

(b) - Our Natural Gas Pipelines segment has regulated and nonregulated operations. Our Natural Gas Pipelines segment’s regulated operations had revenues of $394.2 million and cost of sales and fuel of $24.3 million.

(c) - Intersegment revenues are primarily commodity sales which are based on the contracted selling price, which is generally index-based and settled monthly, and for the Natural Gas Gathering and Processing segment totaled $2.9 billion. Intersegment revenues for the Natural Gas Liquids and Natural Gas Pipelines segments were not material.

Year Ended December 31, 2021	Total Segments		Other and Eliminations		Total
	(Thousands of dollars)
Reconciliations of total segments to consolidated
NGL and condensate sales	$	16,474,295	$	(2,904,598)	$	13,569,697
Residue natural gas sales	1,599,393		—		1,599,393
Gathering, processing and exchange services revenue	653,259		—		653,259
Transportation and storage revenue	670,117		(13,121)		656,996
Other	63,251		(2,287)		60,964
Total revenues (a)	$	19,460,315	$	(2,920,006)	$	16,540,309
Cost of sales and fuel (exclusive of depreciation and operating costs)	$	(15,176,975)	$	2,920,320	$	(12,256,655)
Operating costs	$	(1,065,731)	$	(1,357)	$	(1,067,088)
Depreciation and amortization	$	(617,650)	$	(4,051)	$	(621,701)
Equity in net earnings from investments	$	122,520	$	—	$	122,520
Investments in unconsolidated affiliates	$	797,613	$	—	$	797,613
Total assets	$	23,414,634	$	206,979	$	23,621,613
Capital expenditures	$	674,731	$	22,123	$	696,854

(a) - Noncustomer revenue for the year ended December 31, 2021, totaled $(565.0) million related primarily to losses from derivatives on commodity contracts.

Year Ended December 31, 2020	Natural Gas Gathering and Processing		Natural Gas Liquids (a)		Natural Gas Pipelines (b)		Total Segments
	(Thousands of dollars)
NGL and condensate sales	$	889,388	$	6,409,332	$	—	$	7,298,720
Residue natural gas sales	771,486		—		8,693		780,179
Gathering, processing and exchange services revenue	141,943		488,574		—		630,517
Transportation and storage revenue	—		182,915		470,097		653,012
Other	17,304		9,192		1,192		27,688
Total revenues (c)	1,820,121		7,090,013		479,982		9,390,116
Cost of sales and fuel (exclusive of depreciation and operating costs)	(843,976)		(5,108,558)		(6,809)		(5,959,343)
Operating costs	(326,938)		(412,900)		(141,713)		(881,551)
Equity in net earnings (loss) from investments	(1,123)		39,938		104,426		143,241
Noncash compensation expense and other	1,952		8,748		1,540		12,240
Segment adjusted EBITDA	$	650,036	$	1,617,241	$	437,426	$	2,704,703
Depreciation and amortization	$	(247,010)	$	(271,900)	$	(55,739)	$	(574,649)
Impairment charges	$	(566,145)	$	(78,785)	$	—	$	(644,930)
Investments in unconsolidated affiliates	$	22,757	$	423,494	$	358,781	$	805,032
Total assets	$	6,499,908	$	13,636,109	$	2,100,213	$	22,236,230
Capital expenditures	$	446,142	$	1,655,759	$	71,918	$	2,173,819

(a) - Our Natural Gas Liquids segment has regulated and nonregulated operations. Our Natural Gas Liquids segment’s regulated operations had revenues of $2.0 billion, of which $1.8 billion related to revenues within the segment, and cost of sales and fuel of $520.6 million.

(b) - Our Natural Gas Pipelines segment has regulated and nonregulated operations. Our Natural Gas Pipelines segment’s regulated operations had revenues of $298.5 million and cost of sales and fuel of $30.4 million.

(c) - Intersegment revenues are primarily commodity sales which are based on the contracted selling price, which is generally index-based and settled monthly, and for the Natural Gas Gathering and Processing segment totaled $865.6 million. Intersegment revenues for the Natural Gas Liquids and Natural Gas Pipelines segments were not material.

Year Ended December 31, 2020	Total Segments		Other and Eliminations		Total
	(Thousands of dollars)
Reconciliations of total segments to consolidated
NGL and condensate sales	$	7,298,720	$	(820,851)	$	6,477,869
Residue natural gas sales	780,179		(10,860)		769,319
Gathering, processing and exchange services revenue	630,517		—		630,517
Transportation and storage revenue	653,012		(14,599)		638,413
Other	27,688		(1,564)		26,124
Total revenues (a)	$	9,390,116	$	(847,874)	$	8,542,242
Cost of sales and fuel (exclusive of depreciation and operating costs)	$	(5,959,343)	$	849,197	$	(5,110,146)
Operating costs	$	(881,551)	$	(4,653)	$	(886,204)
Depreciation and amortization	$	(574,649)	$	(4,013)	$	(578,662)
Impairment charges	$	(644,930)	$	—	$	(644,930)
Equity in net earnings from investments	$	143,241	$	—	$	143,241
Investments in unconsolidated affiliates	$	805,032	$	—	$	805,032
Total assets	$	22,236,230	$	842,524	$	23,078,754
Capital expenditures	$	2,173,819	$	21,562	$	2,195,381

(a) - Noncustomer revenue for the year ended December 31, 2020, totaled $65.8 million related primarily to gains from derivatives on commodity contracts.

Year Ended December 31, 2019	Natural Gas Gathering and Processing		Natural Gas Liquids (a)		Natural Gas Pipelines (b)		Total Segments
	(Thousands of dollars)
NGL and condensate sales	$	1,224,378	$	7,910,833	$	—	$	9,135,211
Residue natural gas sales	966,149		—		1,244		967,393
Gathering, processing and exchange services revenue	164,299		414,238		—		578,537
Transportation and storage revenue	—		197,483		466,266		663,749
Other	13,813		9,962		4,477		28,252
Total revenues (c)	2,368,639		8,532,516		471,987		11,373,142
Cost of sales and fuel (exclusive of depreciation and operating costs)	(1,302,310)		(6,690,918)		(4,628)		(7,997,856)
Operating costs	(368,352)		(456,892)		(157,230)		(982,474)
Equity in net earnings (loss) from investments	(6,292)		65,123		95,710		154,541
Noncash compensation expense and other	10,965		15,936		2,977		29,878
Segment adjusted EBITDA	$	702,650	$	1,465,765	$	408,816	$	2,577,231
Depreciation and amortization	$	(219,519)	$	(196,132)	$	(57,250)	$	(472,901)
Investments in unconsolidated affiliates	$	34,426	$	439,393	$	388,025	$	861,844
Total assets	$	6,795,744	$	12,551,476	$	2,094,072	$	21,441,292
Capital expenditures	$	926,489	$	2,796,604	$	99,221	$	3,822,314

(a) - Our Natural Gas Liquids segment has regulated and nonregulated operations. Our Natural Gas Liquids segment’s regulated operations had revenues of $1.4 billion, of which $1.2 billion related to revenues within the segment, and cost of sales and fuel of $496.8 million.

(b) - Our Natural Gas Pipelines segment has regulated and nonregulated operations. Our Natural Gas Pipelines segment’s regulated operations had revenues of $285.3 million and cost of sales and fuel of $20.0 million.

(c) - Intersegment revenues are primarily commodity sales which are based on the contracted selling price, which is generally index-based and settled monthly, and for the Natural Gas Gathering and Processing segment totaled $1.2 billion. Intersegment revenues for the Natural Gas Liquids and Natural Gas Pipelines segments were not material.

Year Ended December 31, 2019	Total Segments		Other and Eliminations		Total
	(Thousands of dollars)
Reconciliations of total segments to consolidated
NGL and condensate sales	$	9,135,211	$	(1,190,424)	$	7,944,787
Residue natural gas sales	967,393		(1,418)		965,975
Gathering, processing and exchange services revenue	578,537		—		578,537
Transportation and storage revenue	663,749		(15,646)		648,103
Other	28,252		(1,287)		26,965
Total revenues (a)	$	11,373,142	$	(1,208,775)	$	10,164,367
Cost of sales and fuel (exclusive of depreciation and operating costs)	$	(7,997,856)	$	1,209,816	$	(6,788,040)
Operating costs	$	(982,474)	$	(390)	$	(982,864)
Depreciation and amortization	$	(472,901)	$	(3,634)	$	(476,535)
Equity in net earnings from investments	$	154,541	$	—	$	154,541
Investments in unconsolidated affiliates	$	861,844	$	—	$	861,844
Total assets	$	21,441,292	$	370,829	$	21,812,121
Capital expenditures	$	3,822,314	$	26,035	$	3,848,349

(a) - Noncustomer revenue for the year ended December 31, 2019, totaled $139.6 million related primarily to gains from derivatives on commodity contracts.

	Years Ended December 31,
	2021		2020		2019
Reconciliation of net income to total segment adjusted EBITDA	(Thousands of dollars)
Net income	$	1,499,706	$	612,809	$	1,278,577
Add:
Interest expense, net of capitalized interest	732,924		712,886		491,773
Depreciation and amortization	621,701		578,662		476,535
Income tax expense	484,498		189,507		372,414
Impairment charges	—		644,930		—
Noncash compensation expense	42,592		8,540		26,699
Other corporate costs and equity AFUDC (a)	(845)		(42,631)		(68,767)
Total segment adjusted EBITDA	$	3,380,576	$	2,704,703	$	2,577,231

(a) - The year ended December 31, 2020, includes corporate net gains of $22.3 million on extinguishment of debt related to open market repurchases. The year ended December 31, 2019, includes higher equity AFUDC related to our capital-growth projects compared with 2020.

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Entity [Line Items]
Contract Liabilities, Contract Term	5 to 10 years.
Number Of Years Of Service Employees Must Work To Be Entitled To Postretirement Medical And Life Insurance Benefits	5 years
Impairment of equity investments	$ 0	$ 37,730	$ 0
Natural Gas Gathering And Processing
Entity [Line Items]
Impairment charges		362,300
Goodwill, Impairment Loss		153,400
Natural Gas Liquids
Entity [Line Items]
Impairment charges		$ 71,600
Venice Energy Services Company [Member] | Natural Gas Gathering And Processing
Entity [Line Items]
Net ownership percentage		10.20%
Impairment of equity investments		$ 30,500
Impairment of equity investments - goodwill		$ 22,300
Chisholm Pipeline Company [Member] | Natural Gas Liquids
Entity [Line Items]
Net ownership percentage		50.00%
Impairment of equity investments		$ 7,200
Northern Border Pipeline [Member]
Entity [Line Items]
Net ownership percentage	50.00%
Northern Border Pipeline [Member] | Natural Gas Pipelines
Entity [Line Items]
Net ownership percentage	50.00%
Roadrunner Gas Transmission [Member]
Entity [Line Items]
Net ownership percentage	50.00%
Roadrunner Gas Transmission [Member] | Natural Gas Pipelines
Entity [Line Items]
Net ownership percentage	50.00%
Overland Pass Pipeline Company [Member]
Entity [Line Items]
Net ownership percentage	50.00%
Overland Pass Pipeline Company [Member] | Natural Gas Liquids
Entity [Line Items]
Net ownership percentage	50.00%

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FAIR VALUE MEASUREMENTS - Part 1 (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Cash held - offsetting derivative net asset positions under master-netting arrangements	$ 0	$ 0
Cash posted - total	157,000	63,100
Cash posted - offsetting derivative net liability positions under master-netting arrangements	99,600	35,100
Cash posted - remaining in excess of derivative net liability positions included in consolidated Balance Sheets	57,400	28,000
Long-term Debt, Fair Value	15,600,000	16,300,000
Long-term Debt	13,600,000	14,200,000
Fair Value, Recurring [Member] | Gross Fair Value Measurement [Member]
Derivative assets
Derivative asset, fair value, gross	204,161	110,498
Derivative liabilities
Derivative liability, fair value, gross	(449,264)	(349,018)
Fair Value, Recurring [Member] | Gross Fair Value Measurement [Member] | Financial contracts
Derivative assets
Derivative asset, fair value, gross	204,161	110,498
Derivative liabilities
Derivative liability, fair value, gross	(303,740)	(145,611)
Fair Value, Recurring [Member] | Gross Fair Value Measurement [Member] | Interest Rate Contracts
Derivative liabilities
Interest-rate contracts	(145,524)	(203,407)
Fair Value, Recurring [Member]
Derivative assets
Derivative assets	0	0
Derivative assets netting	(204,161)	(110,498)
Derivative liabilities
Derivative liabilities	(145,524)	(203,407)
Derivative liabilities netting	303,740	145,611
Fair Value, Recurring [Member] | Financial contracts
Derivative assets
Derivative assets	0	0
Derivative assets netting	(204,161)	(110,498)
Derivative liabilities
Derivative liabilities	0	0
Derivative liabilities netting	303,740	145,611
Fair Value, Recurring [Member] | Interest Rate Contracts
Derivative liabilities
Interest-rate contracts	(145,524)	(203,407)
Derivative liabilities netting	0	0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Derivative assets
Derivative asset, fair value, gross	22,019	6,697
Derivative liabilities
Derivative liability, fair value, gross	(67,226)	(10,489)
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Financial contracts
Derivative assets
Derivative asset, fair value, gross	22,019	6,697
Derivative liabilities
Derivative liability, fair value, gross	(67,226)	(10,489)
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Interest Rate Contracts
Derivative liabilities
Interest-rate contracts	0	0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Derivative assets
Derivative asset, fair value, gross	172,833	0
Derivative liabilities
Derivative liability, fair value, gross	(258,446)	(203,407)
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Financial contracts
Derivative assets
Derivative asset, fair value, gross	172,833	0
Derivative liabilities
Derivative liability, fair value, gross	(112,922)	0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Interest Rate Contracts
Derivative liabilities
Interest-rate contracts	(145,524)	(203,407)
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Derivative assets
Derivative asset, fair value, gross	9,309	103,801
Derivative liabilities
Derivative liability, fair value, gross	(123,592)	(135,122)
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Financial contracts
Derivative assets
Derivative asset, fair value, gross	9,309	103,801
Derivative liabilities
Derivative liability, fair value, gross	(123,592)	(135,122)
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Interest Rate Contracts
Derivative liabilities
Interest-rate contracts	$ 0	$ 0

XML

FAIR VALUE MEASUREMENTS - Part 2 (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Fair Value, Assets And Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Abstract]
Net assets (liabilities) at beginning of period	$ (31,321)	$ 30,772
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Settlements	31,003	(31,660)
Transfers in or out of level 3	(59,911)	0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, New Level 3 Derivatives	(57,325)	(36,568)
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Unrealized Change Included in Other Comprehensive Income (Loss)	3,271	6,135
Net assets (liabilities) at end of period	$ (114,283)	$ (31,321)

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RISK MANAGEMENT AND HEDGING ACTIVITIES USING DERIVATIVES - Part 1 (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Derivatives, Fair Value [Line Items]
Assets	$ 204,161	$ 110,498
(Liabilities)	(449,264)	(349,018)
Derivative, Net Liability Position, Aggregate Fair Value	0
Cash posted - offsetting derivative net liability positions under master-netting arrangements	99,600	35,100
Derivatives designated as hedging instruments
Derivatives, Fair Value [Line Items]
Assets	204,161	107,461
(Liabilities)	(449,264)	(345,980)
Derivatives not designated as hedging instruments
Derivatives, Fair Value [Line Items]
Assets	0	3,037
(Liabilities)	0	(3,038)
Natural Gas Pipelines
Derivatives, Fair Value [Line Items]
Derivative, Fair Value, Net	0	0
Other Current Liabilities [Member] | Interest Rate Contracts | Derivatives designated as hedging instruments
Derivatives, Fair Value [Line Items]
Assets	0	0
(Liabilities)	(145,524)	0
Other Deferred Credits | Interest Rate Contracts | Derivatives designated as hedging instruments
Derivatives, Fair Value [Line Items]
Assets	0	0
(Liabilities)	0	(203,407)
Fully Netted Assets/Liabilities | Commodity contracts | Financial contracts | Derivatives designated as hedging instruments
Derivatives, Fair Value [Line Items]
Assets	204,161	107,461
(Liabilities)	(303,740)	(142,573)
Fully Netted Assets/Liabilities | Commodity contracts | Financial contracts | Derivatives not designated as hedging instruments
Derivatives, Fair Value [Line Items]
Assets	0	3,037
(Liabilities)	$ 0	$ (3,038)

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RISK MANAGEMENT AND HEDGING ACTIVITIES USING DERIVATIVES - Part 2 (Details) $ in Millions	3 Months Ended		12 Months Ended
	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2021 USD ($) Bcf MMBbls	Dec. 31, 2020 USD ($) MMBbls Bcf
Derivative [Line Items]
Realized Loss on Settled Interest Rate Swaps Recorded in AOCI	$ 48.3	$ 152.5		$ 48.3
Notional Amount Of Cash Flow Hedge Instruments Settled	$ 1,300.0	750.0		1,300.0
Derivatives designated as hedging instruments | Interest Rate Contract | Purchased/Payor
Derivative [Line Items]
Derivative, Notional Amount			$ 1,100.0	$ 1,100.0
Derivatives designated as hedging instruments | Future | Natural gas (Bcf) | Fixed price | Sold/Receiver
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Volume | Bcf			32.3	43.3
Derivatives designated as hedging instruments | Future | Natural gas (Bcf) | Basis | Sold/Receiver
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Volume | Bcf			30.5	43.3
Derivatives designated as hedging instruments | Future | Crude oils and NGLs (MMBbl) | Fixed price | Sold/Receiver
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Volume | MMBbls			10.0	4.6
Derivatives not designated as hedging instruments | Future | Crude oils and NGLs (MMBbl) | Fixed price | Purchased/Payor
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Volume | MMBbls			0.8
Derivatives not designated as hedging instruments | Future | Crude oils and NGLs (MMBbl) | Fixed price | Sold/Receiver
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Volume | MMBbls			0.8
Forecasted Debt Issuances [Member] | Cash Flow Hedging [Member] | Forward contracts | Interest Rate Contract
Derivative [Line Items]
Derivative, Notional Amount			$ 1,100.0	$ 1,100.0
Notes Payable from Public Offering Due 2025, 2030 and 2050 [Member]
Derivative [Line Items]
Senior Notes, Noncurrent		$ 1,750.0

XML

RISK MANAGEMENT AND HEDGING ACTIVITIES USING DERIVATIVES - Part 3 (Details) - Cash Flow Hedging [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized change in fair value of cash flow hedges in other comprehensive income (loss)	$ (264,764)	$ (214,315)	$ (191,952)
Change in fair value of cash flow hedges reclassified from accumulated other comprehensive loss into net income on derivatives	(298,133)	(27,410)	27,115
Commodity Contract
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized change in fair value of cash flow hedges in other comprehensive income (loss)	(322,648)	(5,699)	38,819
Commodity Contract | Commodity sales revenues
Derivative Instruments, Gain (Loss) [Line Items]
Change in fair value of cash flow hedges reclassified from accumulated other comprehensive loss into net income on derivatives	(731,793)	85,436	94,547
Commodity Contract | Cost of sales and fuel
Derivative Instruments, Gain (Loss) [Line Items]
Change in fair value of cash flow hedges reclassified from accumulated other comprehensive loss into net income on derivatives	473,612	(19,170)	(44,202)
Interest Rate Contract
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized change in fair value of cash flow hedges in other comprehensive income (loss)	57,884	(208,616)	(230,771)
Interest Rate Contract | Interest expense
Derivative Instruments, Gain (Loss) [Line Items]
Change in fair value of cash flow hedges reclassified from accumulated other comprehensive loss into net income on derivatives	$ (39,952)	$ (93,676)	$ (23,230)

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PROPERTY, PLANT AND EQUIPMENT - (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment	$ 23,820,539	$ 23,072,935
Accumulated depreciation and amortization	(4,500,665)	(3,918,007)
Net property, plant and equipment	19,319,874	19,154,928
Construction in Progress Expenditures Incurred but Not yet Paid	130,500	151,700	$ 544,800
Amortization expense for intangible assets	10,400	10,800	$ 11,900
Natural Gas Liquids
Property, Plant and Equipment [Line Items]
Impairment charges		71,600
Natural Gas Gathering And Processing
Property, Plant and Equipment [Line Items]
Impairment charges		362,300
Non-Regulated Property, Plant and Equipment [Member]
Property, Plant and Equipment [Line Items]
Accumulated depreciation and amortization	(2,885,020)	(2,514,328)
Non-Regulated Property, Plant and Equipment [Member] | Gathering pipelines and related equipment
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment	$ 4,371,936	4,143,752
Non-Regulated Property, Plant and Equipment [Member] | Gathering pipelines and related equipment | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	5 years
Non-Regulated Property, Plant and Equipment [Member] | Gathering pipelines and related equipment | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	40 years
Non-Regulated Property, Plant and Equipment [Member] | Processing and fractionation and related equipment
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment	$ 5,356,508	5,084,802
Non-Regulated Property, Plant and Equipment [Member] | Processing and fractionation and related equipment | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	3 years
Non-Regulated Property, Plant and Equipment [Member] | Processing and fractionation and related equipment | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	40 years
Non-Regulated Property, Plant and Equipment [Member] | Storage and related equipment
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment	$ 874,522	798,785
Non-Regulated Property, Plant and Equipment [Member] | Storage and related equipment | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	3 years
Non-Regulated Property, Plant and Equipment [Member] | Storage and related equipment | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	54 years
Non-Regulated Property, Plant and Equipment [Member] | Transmission pipelines and related equipment
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment	$ 886,343	810,434
Non-Regulated Property, Plant and Equipment [Member] | Transmission pipelines and related equipment | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	5 years
Non-Regulated Property, Plant and Equipment [Member] | Transmission pipelines and related equipment | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	54 years
Non-Regulated Property, Plant and Equipment [Member] | General plant and other
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment	$ 695,117	647,675
Non-Regulated Property, Plant and Equipment [Member] | General plant and other | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	2 years
Non-Regulated Property, Plant and Equipment [Member] | General plant and other | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	60 years
Non-Regulated Property, Plant and Equipment [Member] | Construction work in process
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment	$ 1,132,961	1,265,736
Regulated Property Plant and Equipment [Member]
Property, Plant and Equipment [Line Items]
Accumulated depreciation and amortization	$ (1,615,645)	$ (1,403,679)
Regulated Property Plant and Equipment [Member] | Natural Gas Liquids
Property, Plant and Equipment [Line Items]
Average Depreciation Rate	2.20%	2.20%	2.00%
Regulated Property Plant and Equipment [Member] | Natural Gas Pipelines
Property, Plant and Equipment [Line Items]
Average Depreciation Rate	2.10%	2.10%	2.10%
Regulated Property Plant and Equipment [Member] | Storage and related equipment
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment	$ 9,197	$ 9,180
Regulated Property Plant and Equipment [Member] | Storage and related equipment | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	5 years
Regulated Property Plant and Equipment [Member] | Storage and related equipment | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	25 years
Regulated Property Plant and Equipment [Member] | Natural gas transmission pipelines and related equipment
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment	$ 1,660,034	1,569,268
Regulated Property Plant and Equipment [Member] | Natural gas transmission pipelines and related equipment | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	5 years
Regulated Property Plant and Equipment [Member] | Natural gas transmission pipelines and related equipment | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	77 years
Regulated Property Plant and Equipment [Member] | NGL transmission pipelines and related equipment
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment	$ 8,595,968	8,423,544
Regulated Property Plant and Equipment [Member] | NGL transmission pipelines and related equipment | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	5 years
Regulated Property Plant and Equipment [Member] | NGL transmission pipelines and related equipment | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	88 years
Regulated Property Plant and Equipment [Member] | General plant and other
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment	$ 73,449	72,535
Regulated Property Plant and Equipment [Member] | General plant and other | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	2 years
Regulated Property Plant and Equipment [Member] | General plant and other | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	50 years
Regulated Property Plant and Equipment [Member] | Construction work in process
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment	$ 164,504	$ 247,224

XML

GOODWILL AND INTANGIBLE ASSETS (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Goodwill	$ 527,592	$ 527,592
Amortization expense for intangible assets	10,400	10,800	$ 11,900
Gross intangible assets and accumulated amortization [Abstract]
Gross intangible assets	381,435	381,435
Accumulated amortization	(145,732)	(135,304)
Net intangible assets	235,703	246,131
Future amortization expense for next five years [Abstract]
Future amortization expense, year one	10,400
Future amortization expense, year two	10,400
Future amortization expense, year three	10,400
Future amortization expense, year four	10,400
Future amortization expense, year five	10,400
Natural Gas Liquids [Member]
Segment Reporting Information [Line Items]
Goodwill	371,217	371,217
Natural Gas Pipelines
Segment Reporting Information [Line Items]
Goodwill	$ 156,375	156,375
Natural Gas Gathering and Processing
Segment Reporting Information [Line Items]
Goodwill, Impairment Loss		153,400
Impairment of Intangible Assets (Excluding Goodwill)		$ 19,900
Natural Gas Gathering And Processing and Natural Gas Liquids [Member] | Minimum [Member]
Segment Reporting Information [Line Items]
Finite-Lived Intangible Asset, Useful Life	15 years
Natural Gas Gathering And Processing and Natural Gas Liquids [Member] | Maximum [Member]
Segment Reporting Information [Line Items]
Finite-Lived Intangible Asset, Useful Life	40 years

XML

DEBT (Details) $ in Thousands		3 Months Ended						12 Months Ended
	Nov. 01, 2021 USD ($) Rate	Jun. 30, 2021 USD ($)	Mar. 31, 2021 USD ($)	Jun. 30, 2020 USD ($) Rate	Mar. 31, 2020 USD ($) Rate	Sep. 30, 2019 USD ($) Rate	Mar. 31, 2019 USD ($) Rate	Dec. 31, 2021 USD ($) Rate	Dec. 31, 2020 USD ($)
Debt Instrument [Line Items]
Total debt								$ 13,756,709	$ 14,361,644
Unamortized portion of terminated swaps								(11,596)	(13,314)
Unamortized debt issuance costs and discounts								(124,855)	(138,887)
Current maturities of long-term debt								(895,814)	(7,650)
Short-term borrowings								0	0
Long-term debt								12,747,636	14,228,421
Letters of Credit Outstanding, Amount								7,700	7,700
Senior Note Covenant, Acceleration Of Indebtedness								$ 100,000
Senior Note Covenant, Trustee Or Holders Percentage Required Upon Event Of Default								25.00%
Long-term Debt, Repurchased Face Amount			$ 55,200						224,400
Repayments of Long-term Debt			$ 54,600						199,600
Gain (Loss) on Extinguishment of Debt									22,300
$2.5 Billion Credit Agreement [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity								$ 2,500,000
Line of Credit Facility, Amount Outstanding								$ 0	0
Indebtedness to Adjusted EBITDA Maximum								5.0
Line of Credit Facility, Sublimit								$ 100,000
Line of Credit Facility, Swingline Subfacility								200,000
Line Of Credit Facility, Option To Increase Borrowing Capacity								$ 3,500,000
Line of Credit Facility, Annual Facility Fee								0.15%
Indebtedness To Adjusted EBITDA Current								4.0
Debt Instrument, Covenant Description								Among other things, these covenants include maintaining a ratio of indebtedness to adjusted EBITDA (EBITDA, as defined in our $2.5 Billion Credit Agreement, adjusted for all noncash charges and increased for projected EBITDA from certain lender-approved capital expansion projects) of no more than 5.0 to 1 at December 31, 2021. Our $2.5 Billion Credit Agreement includes a $100 million sublimit for the issuance of standby letters of credit and a $200 million sublimit for swingline loans. Under the terms of our $2.5 Billion Credit Agreement, we may request an increase in the size of the facility to an aggregate of $3.5 billion by either commitments from new lenders or increased commitments from existing lenders. Our $2.5 Billion Credit Agreement contains provisions for an applicable margin rate and an annual facility fee, both of which adjust with changes in our credit ratings. Based on our current credit ratings, borrowings, if any, will accrue at LIBOR, or alternate benchmark rate, plus 110 basis points, and the annual facility fee is 15 basis points. At December 31, 2021, our ratio of indebtedness to adjusted EBITDA was 4.0 to 1, and we were in compliance with all covenants under our $2.5 Billion Credit Agreement.
$2.5 Billion Credit Agreement [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate								1.10%
Notes Payable from Public Offering Due 2026, 2031 and 2051 [Member]
Debt Instrument [Line Items]
Senior Notes, Noncurrent				$ 1,500,000
Proceeds from Debt, Net of Issuance Costs				1,480,000
Notes Payable from Public Offering Due 2025, 2030 and 2050 [Member]
Debt Instrument [Line Items]
Senior Notes, Noncurrent					$ 1,750,000
Proceeds from Debt, Net of Issuance Costs					1,730,000
Notes Payable from Public Offering Due 2024, 2029 and 2049 [Member]
Debt Instrument [Line Items]
Senior Notes, Noncurrent						$ 2,000,000
Proceeds from Debt, Net of Issuance Costs						1,970,000
Notes Payable from Public Offering Due 2029 and 2048 [Member]
Debt Instrument [Line Items]
Senior Notes, Noncurrent							$ 1,250,000
Proceeds from Debt, Net of Issuance Costs							$ 1,230,000
Interest Obligations on Debt
Debt Instrument [Line Items]
2022								$ 670,500
2023								629,300
2024								584,600
2025								553,600
2026								508,800
Total Aggregate Maturities of Long-term Debt Outstanding and Interest Obligations on Debt
Debt Instrument [Line Items]
2022								1,566,300
2023								1,554,300
2024								1,084,600
2025								1,440,600
2026								1,108,800
Senior Notes [Member]
Debt Instrument [Line Items]
2022								895,800
2023								925,000
2024								500,000
2025								887,000
2026								600,000
Guardian Pipeline [Member] | Notes Payables 1 due 2022 [Member]
Debt Instrument [Line Items]
Total debt								$ 0	13,657
Average interest rate (in hundredths) | Rate								7.85%
Repayments of Long-term Debt		$ 11,700
Subsidiary Issuer [Member] | 8.625% Notes Payables due 2019
Debt Instrument [Line Items]
Interest rates (in hundredths) | Rate							8.625%
Repayments of Long-term Debt							$ 500,000
Subsidiary Issuer [Member] | 3.80% Notes Payable due 2020
Debt Instrument [Line Items]
Extinguishment of Debt, Amount						$ 300,000
Interest rates (in hundredths) | Rate						3.80%
Debt Instrument, Redemption Price						$ 308,000
Gain (Loss) on Extinguishment of Debt						(2,700)
Subsidiary Issuer [Member] | 3.375% Notes Payable due 2022 [Member]
Debt Instrument [Line Items]
Total debt								$ 895,814	895,814
Debt Instrument, Face Amount								$ 900,000
Interest rates (in hundredths) | Rate								3.375%
Subsidiary Issuer [Member] | 5.0% Notes Payable due 2023 [Member]
Debt Instrument [Line Items]
Total debt								$ 425,000	425,000
Debt Instrument, Face Amount								$ 425,000
Interest rates (in hundredths) | Rate								5.00%
Subsidiary Issuer [Member] | 4.9% Notes Payable due 2025 [Member]
Debt Instrument [Line Items]
Total debt								$ 500,000	500,000
Debt Instrument, Face Amount								$ 500,000
Interest rates (in hundredths) | Rate								4.90%
Subsidiary Issuer [Member] | 6.65% Notes Payable due 2036 [Member]
Debt Instrument [Line Items]
Total debt								$ 600,000	600,000
Debt Instrument, Face Amount								$ 600,000
Interest rates (in hundredths) | Rate								6.65%
Subsidiary Issuer [Member] | 6.85% Notes Payable due 2037 [Member]
Debt Instrument [Line Items]
Total debt								$ 600,000	600,000
Debt Instrument, Face Amount								$ 600,000
Interest rates (in hundredths) | Rate								6.85%
Subsidiary Issuer [Member] | 6.125% Notes Payable due 2041 [Member]
Debt Instrument [Line Items]
Total debt								$ 650,000	650,000
Debt Instrument, Face Amount								$ 650,000
Interest rates (in hundredths) | Rate								6.125%
Subsidiary Issuer [Member] | 6.2% Notes Payable due 2043 [Member]
Debt Instrument [Line Items]
Total debt								$ 400,000	400,000
Debt Instrument, Face Amount								$ 400,000
Interest rates (in hundredths) | Rate								6.20%
Parent Company
Debt Instrument [Line Items]
Commercial Paper								$ 0	0
Parent Company | Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Covenant Description								Our senior notes are governed by indentures containing covenants, including among other provisions, limitations on our ability to place liens on our property or assets and to sell and leaseback our property. The indentures governing our 6.875% senior notes due 2028 include an event of default upon acceleration of other indebtedness of $15 million or more, and the indentures governing the remainder of our senior notes include an event of default upon the acceleration of other indebtedness of $100 million or more. Such events of default would entitle the trustee or the holders of 25% in aggregate principal amount of the outstanding senior notes to declare those senior notes immediately due and payable in full. The indenture for the 7.5% notes due 2023 also contains a provision that allows the holders of the notes to require ONEOK to offer to repurchase all or any part of their notes if a change of control and a credit rating downgrade occur at a purchase price of 101% of the principal amount, plus accrued and unpaid interest, if any.
Debt instrument call feature								We may redeem our senior notes, in whole or in part, at any time prior to their maturity at a redemption price equal to the principal amount, plus accrued and unpaid interest and a make-whole premium. We may redeem the balance of our senior notes due 2022, 2023, 2024, 2025, 2026, 2027, 2028 (4.55%), 2029, 2030, 2031, 2041, 2043, 2047, 2048, 2049, 2050 and 2051 at a redemption price equal to the principal amount, plus accrued and unpaid interest, starting one to six months before the maturity date as stipulated in the respective contract terms. Our senior notes are senior unsecured obligations, ranking equally in right of payment with all of our existing and future unsecured senior indebtedness.
Parent Company | Term Loan Agreement due 2021 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount				1,500,000
Repayments of Long-term Debt				1,250,000		250,000
Parent Company | 4.25% Notes Payable due 2022 [Member]
Debt Instrument [Line Items]
Total debt								$ 0	541,877
Debt Instrument, Face Amount	$ 700,000							$ 700,000
Interest rates (in hundredths) | Rate	4.25%							4.25%
Repayments of Long-term Debt	$ 536,100
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed	100.00%
Parent Company | 7.5% Notes Payable due 2023 [Member]
Debt Instrument [Line Items]
Total debt								$ 500,000	500,000
Debt Instrument, Face Amount								$ 500,000
Interest rates (in hundredths) | Rate								7.50%
Senior Note Covenant, Redemption Price Upon Event Of Default | Rate								101.00%
Parent Company | 2.75% Notes Payable due 2024 [Member]
Debt Instrument [Line Items]
Total debt								$ 500,000	500,000
Debt Instrument, Face Amount						$ 500,000		$ 500,000
Interest rates (in hundredths) | Rate						2.75%		2.75%
Parent Company | 2.2% Notes Payable due 2025 [Member]
Debt Instrument [Line Items]
Total debt								$ 387,000	387,000
Debt Instrument, Face Amount					$ 400,000			$ 400,000
Interest rates (in hundredths) | Rate					2.20%			2.20%
Parent Company | 5.85% Notes Payable due 2026 [Member]
Debt Instrument [Line Items]
Total debt								$ 600,000	600,000
Debt Instrument, Face Amount				$ 600,000				$ 600,000
Interest rates (in hundredths) | Rate				5.85%				5.85%
Parent Company | 4.0% Notes Payable due 2027 [Member]
Debt Instrument [Line Items]
Total debt								$ 500,000	500,000
Debt Instrument, Face Amount								$ 500,000
Interest rates (in hundredths) | Rate								4.00%
Parent Company | 4.55% Notes Payable due 2028 [Member]
Debt Instrument [Line Items]
Total debt								$ 800,000	800,000
Debt Instrument, Face Amount								$ 800,000
Interest rates (in hundredths) | Rate								4.55%
Parent Company | 6.875% Notes Payable due 2028 [Member]
Debt Instrument [Line Items]
Total debt								$ 100,000	100,000
Debt Instrument, Face Amount								$ 100,000
Interest rates (in hundredths) | Rate								6.875%
Senior Note Covenant, Acceleration Of Indebtedness								$ 15,000
Parent Company | 4.35% Notes Payable due 2029 [Member]
Debt Instrument [Line Items]
Total debt								700,000	700,000
Debt Instrument, Face Amount							$ 700,000	$ 700,000
Interest rates (in hundredths) | Rate							4.35%	4.35%
Parent Company | 3.4% Notes Payable due 2029 [Member]
Debt Instrument [Line Items]
Total debt								$ 714,251	714,251
Debt Instrument, Face Amount						$ 750,000		$ 750,000
Interest rates (in hundredths) | Rate						3.40%		3.40%
Parent Company | 3.1% Notes Payable due 2030 [Member]
Debt Instrument [Line Items]
Total debt								$ 780,093	780,093
Debt Instrument, Face Amount					$ 850,000			$ 850,000
Interest rates (in hundredths) | Rate					3.10%			3.10%
Parent Company | 6.35% Notes Payable due 2031 [Member]
Debt Instrument [Line Items]
Total debt								$ 600,000	600,000
Debt Instrument, Face Amount				$ 600,000				$ 600,000
Interest rates (in hundredths) | Rate				6.35%				6.35%
Parent Company | 6.0% Notes Payable due 2035 [Member]
Debt Instrument [Line Items]
Total debt								$ 400,000	400,000
Debt Instrument, Face Amount								$ 400,000
Interest rates (in hundredths) | Rate								6.00%
Parent Company | 4.95% Notes Payable due 2047 [Member]
Debt Instrument [Line Items]
Total debt								$ 689,006	689,006
Debt Instrument, Face Amount								$ 700,000
Interest rates (in hundredths) | Rate								4.95%
Parent Company | 5.2% Notes Payable due 2048 [Member]
Debt Instrument [Line Items]
Total debt								$ 1,000,000	1,000,000
Debt Instrument, Face Amount								$ 1,000,000
Interest rates (in hundredths) | Rate								5.20%
Parent Company | Note Payables, Additional Issuance, due 2048 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount							$ 550,000
Interest rates (in hundredths) | Rate							5.20%
Parent Company | 4.45% Notes Payable due 2049 [Member]
Debt Instrument [Line Items]
Total debt								$ 672,530	713,676
Debt Instrument, Face Amount						$ 750,000		$ 750,000
Interest rates (in hundredths) | Rate						4.45%		4.45%
Parent Company | 4.5% Notes Payable due 2050 [Member]
Debt Instrument [Line Items]
Total debt								$ 443,015	451,270
Debt Instrument, Face Amount					$ 500,000			$ 500,000
Interest rates (in hundredths) | Rate					4.50%			4.50%
Parent Company | 7.15% Notes Payable due 2051 [Member]
Debt Instrument [Line Items]
Total debt								$ 300,000	$ 300,000
Debt Instrument, Face Amount				$ 300,000				$ 300,000
Interest rates (in hundredths) | Rate				7.15%				7.15%

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EQUITY (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended													12 Months Ended
	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Stock Issued During Period, Shares, New Issues								29,900
Public Offering Price								$ 32.00
Dividends, Cash														$ 1,700,000	$ 1,600,000	$ 1,500,000
Common Stock, Dividends, Per Share, Cash Paid		$ 0.935	$ 0.935	$ 0.935	$ 0.935	$ 0.935	$ 0.935	$ 0.935	$ 0.935	$ 0.915	$ 0.890	$ 0.865	$ 0.860	$ 3.74	$ 3.74	$ 3.53
Stock Issued During Period, Value, New Issues								$ 937,000
Dividends, Preferred Stock, Cash														$ 1,100	$ 1,100	$ 1,100
Preferred stock dividends paid														$ 1,100	$ 1,100	$ 1,100
Issued Under Equity Agreement
Common Stock Sold Under Equity Distribution Agreement														0
ONEOK [Member]
Aggregate Amount Of Common Shares Available For Issuance And Sale Under Equity Distribution Agreement							$ 1,000,000
Series A Preferred Stock [Member]
Preferred Stock, Shares Outstanding		0												0
Series E Preferred Stock [Member]
Preferred Stock, Dividend Rate, Percentage														5.50%
Subsequent Event [Member]
Common Stock, Dividends, Per Share, Declared	$ 0.935
Common Stock, Dividends, Per Share, Declared, Annualized	$ 3.74
Dividends Payable, Date of Record	Jan. 31, 2022
Preferred stock dividends paid	$ 300

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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Risk management assets/liabilities - January 1	$ (377,446)	$ (233,520)
Retirement and other postretirement benefit plan obligations - January 1	(157,635)	(131,481)
Risk-management assets/liabilities of unconsolidated affiliates - January 1	(16,368)	(8,999)
Accumulated other comprehensive loss - January 1	(551,449)	(374,000)
Other comprehensive income (loss) before reclassification, risk-management assets/liabilities	(203,868)	(165,023)	$ (147,803)
Other comprehensive (income) loss before reclassification, retirement and other postretirement benefit plan obligations	31,897	(40,341)
Other comprehensive income (loss) before reclassification, risk-management assets/liabilities of unconsolidated affiliates	3,088	(8,635)
Other comprehensive income (loss) before reclassifications	(168,883)	(213,999)
Other comprehensive income reclassification adjustment from AOCI for risk-management assets/liabilities, net of tax	228,999	21,097	(21,057)
Other comprehensive income, retirement and other postretirement benefit plans, reclassification adjustment from AOCI, net of tax	18,079	14,187
Other comprehensive income, reclassification adjustment from AOCI for other comprehensive income attributable to unconsolidated affiliates, net of tax	1,903	1,266
Other comprehensive income, reclassification adjustment included in net income, net of tax	248,981	36,550
Other comprehensive income (loss), risk-management assets/liabilities, after reclassification adjustment, net of tax	25,131	(143,926)
Other comprehensive (income) loss, retirement and other postretirement benefit plans, after reclassification adjustment, net of tax	49,976	(26,154)	(9,696)
Other comprehensive income (loss), risk-management assets/liabilities of unconsolidated affiliates, net of tax	4,991	(7,369)
Other comprehensive income (loss), net of tax	80,098	(177,449)
Risk management assets/liabilities - December 31	(352,315)	(377,446)	(233,520)
Retirement and other postretirement benefit plan obligations - December 31	(107,659)	(157,635)	(131,481)
Risk-management assets/liabilities of unconsolidated affiliates - December 31	(11,377)	(16,368)	(8,999)
Accumulated other comprehensive loss - December 31	(471,351)	$ (551,449)	$ (374,000)
Cash Flow Hedging [Member] | Commodity Contract
Unrealized gain loss on cash flow hedges net of tax accumulated other comprehensive income loss	(76,942)
Price risk cash flow hedge unrealized gain (loss) to be reclassified during next 12 months	(76,800)
Cash Flow Hedging [Member] | Interest Rate Contract
Amount of accumulated other comprehensive income (loss) attributable primarily to settled interest-rate swaps	(163,320)
Amount of accumulated other comprehensive income (loss) attributable primarily to forward starting interest-rate swaps	(112,053)
Interest rate cash flow hedge gain (loss) to be reclassified during next 12 months, net	$ (27,100)

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EARNINGS PER SHARE EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Basic EPS
Net income available for common stock	$ 1,498,606	$ 611,709	$ 1,277,477
Shares	446,403	431,105	413,560
Earnings per share, basic	$ 3.36	$ 1.42	$ 3.09
Diluted EPS
Effect of dilutive securities	$ 0	$ 0	$ 0
Effect of dilutive securities, number of shares	1,000	677	1,884
Net income available to common stockholders, Diluted	$ 1,498,606	$ 611,709	$ 1,277,477
Shares	447,403	431,782	415,444
Earnings per share, diluted	$ 3.35	$ 1.42	$ 3.07

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SHARE-BASED PAYMENTS SHARE-BASED PAYMENTS (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common Stock, Capital Shares Reserved for Future Issuance	8,500,000
Number of Shares Available for Issuance	5,500,000
Forfeiture rate maximum (in hundredths)	3.00%
Allocated share-based compensation expense	$ 54,100	$ 29,400	$ 46,500
Tax Benefit	$ 14,400	$ 14,100	$ 31,700
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award Vesting Period	3 years
Nonvested Award, Cost Not yet Recognized, Amount	$ 19,300
Nonvested Award, Cost Not yet Recognized, Period for Recognition	1 year 9 months 18 days
Nonvested, number of units	779,937	646,287
Granted, units	417,212
Released to participants, units	(242,765)
Forfeited, units	(40,797)
Nonvested, Weighted Average Grant Date Fair Value	$ 59.02	$ 63.85
Grants in Period, Weighted Average Grant Date Fair Value	46.84	$ 76.49	$ 58.07
Vested in Period, Weighted Average Grant Date Fair Value	51.57
Forfeitures, Weighted Average Grant Date Fair Value	$ 55.27
Granted in Period, Fair Value	$ 19,542	$ 16,552	$ 15,238
Vested in Period, Fair Value	$ 12,519	$ 11,204	$ 10,691
Performance-Unit Activity
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Payment Award, Description	Upon vesting, a holder of outstanding performance units is entitled to receive a number of shares of our common stock equal to a percentage (0% to 200%) of the performance units granted, based on our total shareholder return over the vesting period, compared with the total shareholder return of a peer group of other energy companies over the same period.
Award Vesting Period	3 years
Nonvested Award, Cost Not yet Recognized, Amount	$ 31,700
Nonvested Award, Cost Not yet Recognized, Period for Recognition	1 year 9 months 18 days
Nonvested, number of units	976,585	834,246
Granted, units	542,183
Released to participants, units	(311,907)
Forfeited, units	(87,937)
Nonvested, Weighted Average Grant Date Fair Value	$ 72.73	$ 75.96
Grants in Period, Weighted Average Grant Date Fair Value	62.03	$ 88.43	$ 68.02
Vested in Period, Weighted Average Grant Date Fair Value	64.00
Forfeitures, Weighted Average Grant Date Fair Value	$ 68.37
Granted in Period, Fair Value	$ 33,632	$ 25,028	$ 23,020
Vested in Period, Fair Value	$ 19,962	$ 17,722	$ 15,018
Volatility	60.30%	21.70%	27.10%
Dividend yield	8.13%	4.87%	5.05%
Risk-free interest rate	0.21%	1.39%	2.47%
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common Stock, Capital Shares Reserved for Future Issuance	11,600,000
Maximum allowable percentage of annual base pay withheld to purchase our common stock	10.00%
Purchase price percentage of the lower of its grant date or exercise date market price	85.00%
Employee participation in the plan (in hundredths)	69.00%	68.00%	62.00%
Shares sold under the Employee Stock Purchase Plan	277,012	359,977	171,590
Weighted Average Share Price of Shares Sold Under the Employee Stock Purchase Plan (In Dollars per Share)	$ 38.98	$ 27.78	$ 51.24
Employee Stock Award Program [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common Stock, Capital Shares Reserved for Future Issuance	900,000
Allocated share-based compensation expense		$ 200	$ 1,000
Shares Awarded Under Employee Stock Award Program	0	2,871	14,022
Share Price of Next Award to be Issued Under the Employee Stock Award Program	$ 78
Non-employees and Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum Value of Shares For Which Awards May Be Issued To A Participant During Any Year	$ 800
Granted, units	0
Options, Outstanding, Number	0

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EMPLOYEE BENEFIT PLANS EMPLOYEE BENEFIT PLANS (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Deferred income taxes	$ (14,929)	$ 7,812	$ 2,910
Total recognized in other comprehensive income (loss)	49,976	(26,154)	(9,696)
Other comprehensive income (loss), risk-management assets/liabilities of unconsolidated affiliates, net of tax	4,991	(7,369)
Accumulated other comprehensive loss, net of tax	$ (107,659)	$ (157,635)	$ (131,481)
Expected long-term return on plan assets	7.00%	7.50%	7.50%
Compensation increase rate	3.60%	3.70%	3.65%
Reclassification Adjustment from AOCI, Tax, Retirement and Other Postretirement Benefit Plans, Gain (Loss)	$ 5,400	$ 4,200	$ 2,900
Deferred Compensation Plan Assets	36,100	32,400
Retirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Benefit Obligation	567,011	583,072	534,849
Service cost	8,314	8,154	7,825
Interest cost	16,900	18,318	20,528
Plan participants’ contributions	0	0
Actuarial loss (gain)	(22,792)	37,951
Benefits paid	(18,483)	(16,200)
Fair value of plan assets	413,183	379,092	346,792
Actual return on plan assets (a)	41,374	36,400
Employer contributions	11,200	12,100
Defined Benefit Plan, Plan Assets, Contributions by Plan Participant	0	0
Defined Benefit Plan, Plan Assets, Benefits Paid	(18,483)	(16,200)
Balance at December 31	(153,828)	(203,980)
Current liabilities	(5,219)	(4,679)
Noncurrent liabilities	(148,609)	(199,301)
Balance at December 31	(153,828)	(203,980)
Defined Benefit Plan, Accumulated Benefit Obligation	541,800	548,200
Expected return on plan assets	(25,109)	(24,964)	(23,600)
Amortization of prior service cost (credit)	114	114	0
Amortization of net loss	19,673	18,306	12,649
Net periodic benefit cost (income)	19,892	19,928	17,402
Net gain (loss) (a)	34,529	(31,016)	(25,389)
Prior service cost	0	0	(601)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax	114	114	0
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax	19,673	18,306	12,649
Deferred income taxes	(12,493)	2,897	3,068
Total recognized in other comprehensive income (loss)	41,823	(9,699)	$ (10,273)
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, Prior Service Cost (Credit), before Tax	(374)	(487)
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), Gain (Loss), before Tax	(131,460)	(185,662)
Accumulated other comprehensive loss	(131,834)	(186,149)
Deferred income taxes	36,759	49,251
Accumulated other comprehensive loss, net of tax	$ (95,075)	$ (136,898)
Discount rate	3.25%	3.00%
Compensation increase rate	3.60%	3.60%
Discount Rates - Retirement and Other Postretirement Plans	3.00%	3.50%	4.50%
Domestic and international equities	42.00%
Long duration fixed income	30.00%
Return-seeking credit	11.00%
Hedge funds	10.00%
Real estate funds	7.00%
Total	100.00%
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months	$ 25,962
Defined Benefit Plan, Expected Future Benefit Payment, Year Two	26,756
Defined Benefit Plan, Expected Future Benefit Payment, Year Three	27,769
Defined Benefit Plan, Expected Future Benefit Payment, Year Four	28,759
Defined Benefit Plan, Expected Future Benefit Payment, Year Five	29,651
Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter	156,041
Defined Benefit Plan, Benefit Obligation, Benefits Paid	(18,483)	$ (16,200)
Retirement Plan [Member] | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	42	43
Retirement Plan [Member] | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Retirement Plan [Member] | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Retirement Plan [Member] | Subtotal
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	42	43
Retirement Plan [Member] | Measured at NAV
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	413,141	379,049
Retirement Plan [Member] | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	42	43
Retirement Plan [Member] | Equity securities | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	42	43
Retirement Plan [Member] | Equity securities | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Retirement Plan [Member] | Equity securities | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Retirement Plan [Member] | Equity securities | Subtotal
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	42	43
Retirement Plan [Member] | Equity securities | Measured at NAV
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Retirement Plan [Member] | Defined Benefit Plan, Common Collective Trust, Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	166,132	164,099
Retirement Plan [Member] | Defined Benefit Plan, Common Collective Trust, Equity Securities | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Retirement Plan [Member] | Defined Benefit Plan, Common Collective Trust, Equity Securities | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Retirement Plan [Member] | Defined Benefit Plan, Common Collective Trust, Equity Securities | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Retirement Plan [Member] | Defined Benefit Plan, Common Collective Trust, Equity Securities | Subtotal
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Retirement Plan [Member] | Defined Benefit Plan, Common Collective Trust, Equity Securities | Measured at NAV
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	166,132	164,099
Retirement Plan [Member] | Real estate funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	30,491	24,134
Retirement Plan [Member] | Real estate funds | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Retirement Plan [Member] | Real estate funds | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Retirement Plan [Member] | Real estate funds | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Retirement Plan [Member] | Real estate funds | Subtotal
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Retirement Plan [Member] | Real estate funds | Measured at NAV
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	30,491	24,134
Retirement Plan [Member] | Government obligations
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	49,444	45,237
Retirement Plan [Member] | Government obligations | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Retirement Plan [Member] | Government obligations | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Retirement Plan [Member] | Government obligations | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Retirement Plan [Member] | Government obligations | Subtotal
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Retirement Plan [Member] | Government obligations | Measured at NAV
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	49,444	45,237
Retirement Plan [Member] | Corporate obligations
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	120,877	101,626
Retirement Plan [Member] | Corporate obligations | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Retirement Plan [Member] | Corporate obligations | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Retirement Plan [Member] | Corporate obligations | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Retirement Plan [Member] | Corporate obligations | Subtotal
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Retirement Plan [Member] | Corporate obligations | Measured at NAV
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	120,877	101,626
Retirement Plan [Member] | Short-term Investments
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	4,243	4,890
Retirement Plan [Member] | Short-term Investments | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Retirement Plan [Member] | Short-term Investments | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Retirement Plan [Member] | Short-term Investments | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Retirement Plan [Member] | Short-term Investments | Subtotal
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Retirement Plan [Member] | Short-term Investments | Measured at NAV
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	4,243	4,890
Retirement Plan [Member] | Other Investments
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	41,954	39,063
Unfunded Capital Commitments	0	0
Retirement Plan [Member] | Other Investments | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Retirement Plan [Member] | Other Investments | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Retirement Plan [Member] | Other Investments | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Retirement Plan [Member] | Other Investments | Subtotal
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Retirement Plan [Member] | Other Investments | Measured at NAV
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 41,954	$ 39,063
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assumed Health Care Cost Trend Rate	6.50%	6.50%
Defined Benefit Plan Assumed Ultimate Health Care Cost Trend Rate	5.00%	5.00%
Minimum Number Of Years Of Service For Certain Employees To Be Eligible To Participate In Welfare Plans That Provide Postretirement Medical And Life Insurance Benefits	5 years
Benefit Obligation	$ 51,027	$ 54,515	$ 52,309
Service cost	421	460	468
Interest cost	1,454	1,771	2,038
Plan participants’ contributions	1,092	1,032
Actuarial loss (gain)	(2,496)	2,860
Benefits paid	(3,959)	(3,917)
Fair value of plan assets	24,397	20,874	39,060
Actual return on plan assets (a)	5,919	(15,699)
Employer contributions	0	0
Defined Benefit Plan, Plan Assets, Contributions by Plan Participant	1,092	1,032
Defined Benefit Plan, Plan Assets, Benefits Paid	(3,488)	(3,519)
Balance at December 31	(26,630)	(33,641)
Current liabilities	0	0
Noncurrent liabilities	(26,630)	(33,641)
Balance at December 31	(26,630)	(33,641)
Expected return on plan assets	(1,364)	(2,894)	(2,285)
Amortization of prior service cost (credit)	0	0	(227)
Amortization of net loss	3,692	5	297
Net periodic benefit cost (income)	4,203	(658)	291
Net gain (loss) (a)	7,052	(21,453)	700
Prior service cost	0	0	0
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax	0	0	(227)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax	3,692	5	297
Deferred income taxes	(2,471)	4,933	(177)
Total recognized in other comprehensive income (loss)	8,273	(16,515)	$ 593
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, Prior Service Cost (Credit), before Tax	0	0
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), Gain (Loss), before Tax	(14,815)	(25,558)
Accumulated other comprehensive loss	(14,815)	(25,558)
Deferred income taxes	3,852	6,322
Accumulated other comprehensive loss, net of tax	$ (10,963)	$ (19,236)
Discount rate	3.00%	2.75%
Discount Rates - Retirement and Other Postretirement Plans	2.75%	3.50%	4.50%
Year that the rate reaches the ultimate trend rate	2025	2024
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months	$ 3,387
Defined Benefit Plan, Expected Future Benefit Payment, Year Two	3,363
Defined Benefit Plan, Expected Future Benefit Payment, Year Three	3,302
Defined Benefit Plan, Expected Future Benefit Payment, Year Four	3,293
Defined Benefit Plan, Expected Future Benefit Payment, Year Five	3,220
Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter	15,339
Defined Benefit Plan, Benefit Obligation, Benefits Paid	(3,959)	$ (3,917)
Other Postretirement Benefits Plan [Member] | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	23,917	20,066
Other Postretirement Benefits Plan [Member] | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	480	808
Other Postretirement Benefits Plan [Member] | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Other Postretirement Benefits Plan [Member] | Subtotal
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	24,397	20,874
Other Postretirement Benefits Plan [Member] | Equity securities | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	17,953	15,116
Other Postretirement Benefits Plan [Member] | Equity securities | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Other Postretirement Benefits Plan [Member] | Equity securities | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Other Postretirement Benefits Plan [Member] | Equity securities | Subtotal
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	17,953	15,116
Other Postretirement Benefits Plan [Member] | Money market funds | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Other Postretirement Benefits Plan [Member] | Money market funds | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	480	808
Other Postretirement Benefits Plan [Member] | Money market funds | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Other Postretirement Benefits Plan [Member] | Money market funds | Subtotal
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	480	808
Other Postretirement Benefits Plan [Member] | Insurance and group annuity contracts
Defined Benefit Plan Disclosure [Line Items]
Actual return on plan assets (a)		13,200
NetProceedsFromExitOfAnInvestmentInAnInsuranceContract		16,200
Other Postretirement Benefits Plan [Member] | Municipal Bonds | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	5,964	4,950
Other Postretirement Benefits Plan [Member] | Municipal Bonds | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Other Postretirement Benefits Plan [Member] | Municipal Bonds | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Other Postretirement Benefits Plan [Member] | Municipal Bonds | Subtotal
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	5,964	4,950
Supplemental Executive Retirement Plan Investments Included in Other Assets[Member]
Defined Benefit Plan Disclosure [Line Items]
Balance at December 31	$ 111,200	116,200
401(k) Plan [Member]
Defined Contribution Plan Disclosure [Line Items]
Percent of employee matched of eligible compensation	100.00%
Percentage of Each Participants Eligible Compensation	6.00%
Contributions made to the Plan	$ 32,700	$ 27,100	$ 30,400
Profit-sharing contribution [Member]
Defined Contribution Plan Disclosure [Line Items]
Percentage of Each Participants Eligible Compensation	1.00%

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INCOME TAXES (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Effective income tax rate reconciliation, at federal statutory income tax rate, percent	21.00%	21.00%	21.00%
Federal net operating loss	$ 1,337,050	$ 1,473,093
State net operating loss and benefits	216,181	258,929
Other tax expense from gains on investments	19,400
Current Tax Expense (Benefit)
Federal	2,897	980	$ (1,278)
State	9,544	1,797	963
Total current tax expense (benefit)	12,441	2,777	(315)
Deferred Tax Expense
Federal	433,469	154,068	327,806
State	38,588	32,662	44,923
Total deferred tax expense	472,057	186,730	372,729
Income tax expense	484,498	189,507	372,414
Income Tax Reconciliation
Income before income taxes	$ 1,984,204	$ 802,316	$ 1,650,991
Federal statutory income tax rate	21.00%	21.00%	21.00%
Provision for federal income taxes	$ 416,683	$ 168,486	$ 346,708
State income taxes, net of federal benefit	40,092	13,580	34,545
Deferred tax rate change, inclusive of valuation allowance	6,350	20,879	11,340
Effective income tax rate reconciliation, tax expense (benefit), share-based payment arrangement, amount	(1,968)	(7,380)	(20,983)
Other, net	23,341	(6,058)	804
Deferred Tax Assets
Employee benefits and other accrued liabilities	95,952	96,741
Federal net operating loss	1,337,050	1,473,093
State net operating loss and benefits	216,181	258,929
Derivative instruments	118,063	134,499
Other	4,863	12,894
Total deferred tax assets	1,772,109	1,976,156
Carryforward expected to expire prior to utilization	(84,755)	(121,212)
Net deferred tax assets	1,687,354	1,854,944
Deferred Tax Liabilities
Excess of tax over book depreciation	84,692	87,021
Deferred tax liabilities, investments	2,769,352	2,437,620
Total deferred tax liabilities	2,854,044	2,524,641
Deferred Tax Liabilities, Net	(1,166,690)	(669,697)
Valuation allowance, deferred tax asset, increase (decrease), amount	6,400	20,900	$ 11,300
Domestic Tax Authority
Operating loss carryforwards	6,400,000
State and Local Jurisdiction | Operating Loss Carryforwards, Subject to Expiration [Domain]
Operating loss carryforwards	1,900,000
State and Local Jurisdiction | Operating Loss Carryforwards, Indefinite Carryforward Period [Domain]
Operating loss carryforwards	2,800,000
Federal and State [Member]
Federal net operating loss	1,600,000	1,700,000
Deferred Tax Assets
Federal net operating loss	$ 1,600,000	$ 1,700,000

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UNCONSOLIDATED AFFILIATES (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated affiliates	$ 797,613	$ 805,032	$ 861,844
Equity method goodwill	16,500	16,500
Equity in net earnings from investments	122,520	143,241	154,541
Impairment of equity investments	0	(37,730)	0
Payments to Acquire Equity Method Investments		20,000
Natural Gas Gathering And Processing
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated affiliates	27,018	22,757	34,426
Equity in net earnings from investments	3,757	(1,123)	(6,292)
Natural Gas Liquids [Member]
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated affiliates	416,648	423,494	439,393
Equity in net earnings from investments	21,000	39,938	65,123
Unconsolidated Affiliates [Member]
Schedule of Equity Method Investments [Line Items]
Related Party Transaction, Expenses from Transactions with Related Party	$ 62,800	135,400	164,700
Northern Border Pipeline [Member]
Schedule of Equity Method Investments [Line Items]
Net ownership percentage	50.00%
Investments in unconsolidated affiliates	$ 283,170	291,987
Equity in net earnings from investments	64,470	75,409	68,871
Payments to Acquire Equity Method Investments	$ 0	0	0
Distributions paid to us			50,000
Cash Distribution Percentage of Equity Method Investment	100.00%
Overland Pass Pipeline Company [Member]
Schedule of Equity Method Investments [Line Items]
Net ownership percentage	50.00%
Investments in unconsolidated affiliates	$ 403,011	409,573
Equity in net earnings from investments	$ 19,434	38,618	63,698
Cash Distribution Percentage of Equity Method Investment	100.00%
Overland Pass Pipeline Company [Member] | Natural Gas Liquids [Member]
Schedule of Equity Method Investments [Line Items]
Net ownership percentage	50.00%
Roadrunner Gas Transmission [Member]
Schedule of Equity Method Investments [Line Items]
Net ownership percentage	50.00%
Investments in unconsolidated affiliates	$ 70,777	66,794
Equity in net earnings from investments	$ 33,293	29,017	26,839
Cash Distribution Percentage of Equity Method Investment	100.00%
Other Unconsolidated Affiliates [Member]
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated affiliates	$ 40,655	36,678
Equity in net earnings from investments	$ 5,323	$ 197	$ (4,867)
Venice Energy Services Company [Member] | Natural Gas Gathering And Processing
Schedule of Equity Method Investments [Line Items]
Net ownership percentage		10.20%
Impairment of equity investments		$ (30,500)
ImpairmentOfEquityMethodInvestmentDifferenceBetweenCarryingAmountAndUnderlyingEquity		$ (22,300)
Chisholm Pipeline Company [Member] | Natural Gas Liquids [Member]
Schedule of Equity Method Investments [Line Items]
Net ownership percentage		50.00%
Impairment of equity investments		$ (7,200)

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COMMITMENTS AND CONTINGENCIES (Details) $ in Millions	Dec. 31, 2021 USD ($)
Firm Transportation and Storage Contracts [Abstract]
2022	$ 72.3
2023	63.1
2024	59.3
2025	53.9
2026	40.8
Thereafter	211.6
Total	$ 501.0

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LEASES (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Jan. 01, 2020
Lessee, Lease, Details [Line Items]
Finance lease assets - accumulated depreciation	$ (4,500,665)	$ (3,918,007)
Operating lease liability - current	13,783	13,610
Operating lease liability - noncurrent	75,636	87,610
Operating cash flows for operating leases	15,690	13,245
Financing cash flows for finance lease	2,307	1,949
Right-of-use assets obtained in exchange for operating lease liability (noncash)	1,150	99,547
Lease remaining balance related to lease entered in December 2019 [Member]
Lessee, Lease, Details [Line Items]
Lessee, Operating Lease, Term of Contract			10 years
Operating lease assets - Other assets		69,000
Present value of operating lease liabilities		69,900
Components of Lease Cost [Member]
Lessee, Lease, Details [Line Items]
Operating leases - Operations and maintenance	17,747	17,162
Finance lease - Amortization of lease assets	1,139	1,131
Finance Lease - Interest on lease liabilities	2,338	2,537
Total lease cost	$ 21,224	$ 20,830
Weighted-Average Remaining Lease Term [Member]
Lessee, Lease, Details [Line Items]
Operating Lease, Weighted Average Remaining Lease Term	7 years 9 months 18 days	8 years 3 months 18 days
Finance Lease, Weighted Average Remaining Lease Term	6 years 7 months 6 days	7 years 9 months 18 days
Weighted-Average Discount Rate [Member]
Lessee, Lease, Details [Line Items]
Operating Lease, Weighted Average Discount Rate, Percent	3.40%	3.20%
Finance Lease, Weighted Average Discount Rate, Percent	9.60%	10.00%
Maturity of Finance Lease Liability [Member]
Lessee, Lease, Details [Line Items]
2022	$ 4,700
2023	4,700
2024	4,700
2025	5,400
2026	4,500
2027 and beyond	8,300
Total lease payments	32,300
Less: Interest	8,600
Present value of finance lease liabilities	23,700
Maturity of Operating Lease Liabilities [Member]
Lessee, Lease, Details [Line Items]
2022	16,400
2023	13,900
2024	12,600
2025	11,200
2026	11,400
2027 and beyond	36,900
Total lease payments	102,400
Less: Interest	13,000
Present value of operating lease liabilities	89,400
Lease Assets and Liabilities Included in the Consolidated Balance Sheet [Member]
Lessee, Lease, Details [Line Items]
Operating lease assets - Other assets	89,558	$ 100,154
Finance lease assets - PPE	29,962	28,286
Finance lease assets - accumulated depreciation	(3,590)	(2,451)
Total leased assets	115,930	125,989
Operating lease liability - current	13,783	13,610
Finance lease liability - current	2,584	2,153
Operating lease liability - noncurrent	75,636	87,610
Finance lease liability - other deferred credits	21,082	22,143
Total lease liabilities	$ 113,085	$ 125,516

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REVENUES (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Contract with Customer, Liability [Abstract]
Contract with customer, liability	$ 51.5	$ 41.4	$ 57.1
Revenue recognized included in beginning balance	(23.7)	(36.1)
Net additions	33.8	20.4
Contract with customer, liability, current	35.3	23.7
Contract with customer, liability, noncurrent	16.2	$ 17.7
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount	$ 1,809.4
Revenue, Remaining Performance Obligation, Contract Term	5 to 10 years.
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Axis]: 2022-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount	$ 339.1
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Axis]: 2023-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount	288.2
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Axis]: 2024-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount	238.1
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Axis]: 2025-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount	162.7
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Axis]: 2026-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount	$ 781.3
Remaining Contract Terms [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Contract Term	one month to 22 years

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SEGMENTS (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Segment Reporting, Disclosure of Major Customers	11.6	10	10
Operating costs	$ (1,067,088)	$ (886,204)	$ (982,864)
Equity in net earnings (loss) from investments	122,520	143,241	154,541
Depreciation and amortization	(621,701)	(578,662)	(476,535)
Impairment charges	0	(644,930)	0
Investments in unconsolidated affiliates (Note M)	797,613	805,032	861,844
Noncash compensation expense	42,592	8,540	26,699
Total assets	23,621,613	23,078,754	21,812,121
Capital expenditures	696,854	2,195,381	3,848,349
Operating income (loss)	2,596,259	1,361,357	1,914,353
Net income	1,499,706	612,809	1,278,577
Interest expense, net of capitalized interest	732,924	712,886	491,773
Income tax expense	484,498	189,507	372,414
Other corporate costs and equity AFUDC	(845)	(42,631)	(68,767)
Revenues	16,540,309	8,542,242	10,164,367
Cost of sales and fuel (exclusive of depreciation and operating costs)	(12,256,655)	(5,110,146)	(6,788,040)
Gain (Loss) on Extinguishment of Debt		22,300
Noncustomer [Domain]
Segment Reporting Information [Line Items]
Revenues	(565,000)	65,800	139,600
Natural Gas Gathering And Processing
Segment Reporting Information [Line Items]
Operating costs	(367,390)	(326,938)	(368,352)
Equity in net earnings (loss) from investments	3,757	(1,123)	(6,292)
Noncash compensation expense and other	17,299	1,952	10,965
Segment adjusted EBITDA	889,127	650,036	702,650
Depreciation and amortization	(260,011)	(247,010)	(219,519)
Impairment charges		(566,145)
Investments in unconsolidated affiliates (Note M)	27,018	22,757	34,426
Total assets	6,768,955	6,499,908	6,795,744
Capital expenditures	275,165	446,142	926,489
Revenues	4,461,539	1,820,121	2,368,639
Cost of sales and fuel (exclusive of depreciation and operating costs)	(3,226,078)	(843,976)	(1,302,310)
Natural Gas Gathering And Processing | Natural Gas Gathering and Processing Intersegment [Member]
Segment Reporting Information [Line Items]
Revenues	2,900,000	865,600	1,200,000
Natural Gas Liquids
Segment Reporting Information [Line Items]
Operating costs	(528,084)	(412,900)	(456,892)
Equity in net earnings (loss) from investments	21,000	39,938	65,123
Noncash compensation expense and other	18,511	8,748	15,936
Segment adjusted EBITDA	1,963,639	1,617,241	1,465,765
Depreciation and amortization	(298,937)	(271,900)	(196,132)
Impairment charges		(78,785)
Investments in unconsolidated affiliates (Note M)	416,648	423,494	439,393
Total assets	14,502,372	13,636,109	12,551,476
Capital expenditures	306,949	1,655,759	2,796,604
Revenues	14,391,873	7,090,013	8,532,516
Cost of sales and fuel (exclusive of depreciation and operating costs)	(11,939,661)	(5,108,558)	(6,690,918)
Natural Gas Liquids | Natural Gas Liquids Regulated [Member]
Segment Reporting Information [Line Items]
Revenues	2,400,000	2,000,000	1,400,000
Cost of sales and fuel (exclusive of depreciation and operating costs)	(607,500)	(520,600)	(496,800)
Natural Gas Pipelines
Segment Reporting Information [Line Items]
Operating costs	(170,257)	(141,713)	(157,230)
Equity in net earnings (loss) from investments	97,763	104,426	95,710
Noncash compensation expense and other	4,637	1,540	2,977
Segment adjusted EBITDA	527,810	437,426	408,816
Depreciation and amortization	(58,702)	(55,739)	(57,250)
Impairment charges		0
Investments in unconsolidated affiliates (Note M)	353,947	358,781	388,025
Total assets	2,143,307	2,100,213	2,094,072
Capital expenditures	92,617	71,918	99,221
Revenues	606,903	479,982	471,987
Cost of sales and fuel (exclusive of depreciation and operating costs)	(11,236)	(6,809)	(4,628)
Natural Gas Pipelines | Natural Gas Pipelines Regulated [Member]
Segment Reporting Information [Line Items]
Revenues	394,200	298,500	285,300
Cost of sales and fuel (exclusive of depreciation and operating costs)	(24,300)	(30,400)	(20,000)
Total Segments [Member]
Segment Reporting Information [Line Items]
Operating costs	(1,065,731)	(881,551)	(982,474)
Equity in net earnings (loss) from investments	122,520	143,241	154,541
Noncash compensation expense and other	40,447	12,240	29,878
Segment adjusted EBITDA	3,380,576	2,704,703	2,577,231
Depreciation and amortization	(617,650)	(574,649)	(472,901)
Impairment charges		(644,930)
Investments in unconsolidated affiliates (Note M)	797,613	805,032	861,844
Total assets	23,414,634	22,236,230	21,441,292
Capital expenditures	674,731	2,173,819	3,822,314
Revenues	19,460,315	9,390,116	11,373,142
Cost of sales and fuel (exclusive of depreciation and operating costs)	(15,176,975)	(5,959,343)	(7,997,856)
Other and Eliminations
Segment Reporting Information [Line Items]
Operating costs	(1,357)	(4,653)	(390)
Equity in net earnings (loss) from investments	0	0	0
Depreciation and amortization	(4,051)	(4,013)	(3,634)
Impairment charges		0
Investments in unconsolidated affiliates (Note M)	0	0	0
Total assets	206,979	842,524	370,829
Capital expenditures	22,123	21,562	26,035
Revenues	(2,920,006)	(847,874)	(1,208,775)
Cost of sales and fuel (exclusive of depreciation and operating costs)	2,920,320	849,197	1,209,816
Operating Segments [Member] | Natural Gas Liquids | Natural Gas Liquids Regulated [Member]
Segment Reporting Information [Line Items]
Revenues	2,200,000	1,800,000	1,200,000
NGL and Condensate Sales [Member]
Segment Reporting Information [Line Items]
Revenues	13,569,697	6,477,869	7,944,787
NGL and Condensate Sales [Member] | Natural Gas Gathering And Processing
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	2,821,175	889,388	1,224,378
NGL and Condensate Sales [Member] | Natural Gas Liquids
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	13,653,120	6,409,332	7,910,833
NGL and Condensate Sales [Member] | Natural Gas Pipelines
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0	0	0
NGL and Condensate Sales [Member] | Total Segments [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	16,474,295	7,298,720	9,135,211
NGL and Condensate Sales [Member] | Other and Eliminations
Segment Reporting Information [Line Items]
Revenues	(2,904,598)	(820,851)	(1,190,424)
Residue Natural Gas Sales [Member]
Segment Reporting Information [Line Items]
Revenues	1,599,393	769,319	965,975
Residue Natural Gas Sales [Member] | Natural Gas Gathering And Processing
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	1,483,898	771,486	966,149
Residue Natural Gas Sales [Member] | Natural Gas Liquids
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0	0	0
Residue Natural Gas Sales [Member] | Natural Gas Pipelines
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	115,495	8,693	1,244
Residue Natural Gas Sales [Member] | Total Segments [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	1,599,393	780,179	967,393
Residue Natural Gas Sales [Member] | Other and Eliminations
Segment Reporting Information [Line Items]
Revenues	0	(10,860)	(1,418)
Gathering and Exchange Services Revenue [Member]
Segment Reporting Information [Line Items]
Revenues	653,259	630,517	578,537
Gathering and Exchange Services Revenue [Member] | Natural Gas Gathering And Processing
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	135,501	141,943	164,299
Gathering and Exchange Services Revenue [Member] | Natural Gas Liquids
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	517,758	488,574	414,238
Gathering and Exchange Services Revenue [Member] | Natural Gas Pipelines
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0	0	0
Gathering and Exchange Services Revenue [Member] | Total Segments [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	653,259	630,517	578,537
Gathering and Exchange Services Revenue [Member] | Other and Eliminations
Segment Reporting Information [Line Items]
Revenues	0	0	0
Transportation and Storage Revenue [Member]
Segment Reporting Information [Line Items]
Revenues	656,996	638,413	648,103
Transportation and Storage Revenue [Member] | Natural Gas Gathering And Processing
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0	0	0
Transportation and Storage Revenue [Member] | Natural Gas Liquids
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	179,619	182,915	197,483
Transportation and Storage Revenue [Member] | Natural Gas Pipelines
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	490,498	470,097	466,266
Transportation and Storage Revenue [Member] | Total Segments [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	670,117	653,012	663,749
Transportation and Storage Revenue [Member] | Other and Eliminations
Segment Reporting Information [Line Items]
Revenues	(13,121)	(14,599)	(15,646)
Other [Member]
Segment Reporting Information [Line Items]
Revenues	60,964	26,124	26,965
Other [Member] | Natural Gas Gathering And Processing
Segment Reporting Information [Line Items]
Revenues	20,965	17,304	13,813
Other [Member] | Natural Gas Liquids
Segment Reporting Information [Line Items]
Revenues	41,376	9,192	9,962
Other [Member] | Natural Gas Pipelines
Segment Reporting Information [Line Items]
Revenues	910	1,192	4,477
Other [Member] | Total Segments [Member]
Segment Reporting Information [Line Items]
Revenues	63,251	27,688	28,252
Other [Member] | Other and Eliminations
Segment Reporting Information [Line Items]
Revenues	$ (2,287)	$ (1,564)	$ (1,287)