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, 2024

Or

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

Commission File Number: 001-40392

DT Midstream, Inc.

Delaware	38-2663964
(State or other jurisdiction of incorporation or organization)	(I.R.S Employer Identification No.)

Registrant's address of principal executive offices: 500 Woodward Ave., Suite 2900, Detroit, Michigan 48226-1279

Registrant's telephone number, including area code: (313) 402-8532

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

Title of Each Class	Trading Symbol	Name of Exchange on which Registered
Common stock, par value $0.01	DTM	New York Stock Exchange

Securities registered pursuant to Section 12(g) of the Exchange 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 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 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, a 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 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. ☒

If securities are registered pursuant to Section 12(b) of the Exchange Act, indicate by check mark whether the financial statements of the registrant included in the filing reflect the correction of an error to previously issued financial statements. Yes ☐ No ☒

Indicate by check mark whether any of those error corrections are restatements that required a recovery analysis of incentive-based compensation received by any of the registrant’s executive officers during the relevant recovery period pursuant to Section 240.10D-1(b). Yes ☐ No ☒

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

On June 28, 2024, the aggregate market value of DT Midstream's voting common stock was approximately $6.9 billion (based on the New York Stock Exchange closing price on such date).

Number of shares of common stock outstanding at February 14, 2025:

Description	Shares
Common stock, par value $0.01	101,358,534

DOCUMENTS INCORPORATED BY REFERENCE

Certain information in DT Midstream's definitive Proxy Statement for our 2025 Annual Meeting of Common Shareholders to be held May 6, 2025, which will be filed with the Securities and Exchange Commission pursuant to Regulation 14A, not later than 120 days after the end of the registrant’s fiscal year covered by this report on Form 10-K, is incorporated herein by reference to Part III (Items 10, 11, 12, 13, and 14) of this Form 10-K.

TABLE OF CONTENTS

		Page
	Definitions	1
	Forward-Looking Statements	4
PART I
Items 1. and 2.	Business and Properties	6
Item 1A.	Risk Factors	24
Item 1B.	Unresolved Staff Comments	39
Item 1C.	Cybersecurity	39
Item 3.	Legal Proceedings	39
Item 4.	Mine Safety Disclosures	39
PART II
Item 5.	Market for Registrant’s Common Equity, Related Stockholder Matters, and Issuer Purchases of Equity Securities	40
Item 7.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	42
Item 7A.	Quantitative and Qualitative Disclosures About Market Risk	54
Item 8.	Financial Statements	55
Item 9.	Changes in and Disagreements with Accountants on Accounting and Financial Disclosure	94
Item 9A.	Controls and Procedures	94
Item 9B.	Other Information	95
Item 9C.	Disclosure Regarding Foreign Jurisdictions that Prevent Inspections	95
PART III
Item 10.	Directors, Executive Officers, and Corporate Governance	95
Item 11.	Executive Compensation	95
Item 12.	Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters	95
Item 13.	Certain Relationships and Related Transactions, and Director Independence	95
Item 14.	Principal Accountant Fees and Services	95
PART IV
Item 15.	Exhibits and Financial Statement Schedules	96
Item 16.	Form 10-K Summary	98
	Signatures	99

DEFINITIONS

Unless the context otherwise requires, references to "we," "us," "our," "Registrant," or the "Company" and words of similar importance refer to DT Midstream and, unless otherwise specified, our consolidated subsidiaries and our unconsolidated joint ventures. As used in this Form 10-K, the terms and definitions below have the following meanings:

AFUDC	Allowance for funds used during construction, represents the cost of financing construction projects for FERC-regulated businesses, including the estimated cost of debt and authorized return on equity
Appalachia Gathering	A 152-mile gathering system that gathers Marcellus shale natural gas and delivers to the Texas Eastern Pipeline and Stonewall
ASC 606	The Accounting Standards Codification of Revenue from Contracts with Customers issued by the FASB
ASU	Accounting Standards Update issued by the FASB
Bcf	Billion cubic feet of natural gas
Bcf/d	Billion cubic feet of natural gas per day
Birdsboro	A 14-mile interstate pipeline transporting gas supply to a gas-fired power plant in Pennsylvania
Bluestone	A 65-mile gathering lateral pipeline, and two compression facilities, that gathers Marcellus shale natural gas and delivers to Millennium and the Tennessee Pipeline
Blue Union Gathering	A 427-mile gathering system that gathers shale natural gas from the Haynesville formation of Louisiana and Texas and delivers to markets in the Gulf Coast region; ancillary services include water impoundment, water transportation, water disposal and sand
Bridge Facility	The $700 million 364-day bridge loan facility committed by Barclays Bank PLC
CAD	Canadian Dollar ($)
CERCLA	Comprehensive Environmental Response, Compensation, and Liability Act
CFTC	Commodity Futures Trading Commission
Chicago Hub	A major natural gas market and transportation hub located in the Chicago area, serving as a critical interconnection point for multiple interstate pipelines
Clean Fuels Acquisition	The purchase of Clean Fuels Gathering from a privately held coal mine methane producer
Clean Fuels Gathering	A 77-mile gathering system that gathers and treats coal mine methane into pipeline quality gas
Columbia Pipeline	Columbia Gas Transmission, LLC, owned by TC Energy Corporation and Global Infrastructure Partners
Credit Agreement	DT Midstream's credit agreement which provides for the Revolving Credit Facility
Distribution	Pro rata distribution to DTE Energy shareholders of all the outstanding common stock of DT Midstream upon the Separation
DTE Energy	DTE Energy Company, the consolidating entity of DT Midstream prior to the Separation
DT Midstream	DT Midstream, Inc. and our consolidated subsidiaries
DT Midstream Plan	The DT Midstream, Inc. Long-Term Incentive Plan
DTM Interstate Transportation	DTM Interstate Transportation, LLC, the consolidated subsidiary of DT Midstream created for the Midwest Pipeline Acquisition which is comprised of Guardian, Midwestern and Viking
EPA	U.S. Environmental Protection Agency
EPAct 2005	Energy Policy Act of 2005
ESA	The U.S. federal Endangered Species Act
ESG	Environmental, social and corporate governance
Expand Energy	Expand Energy Corporation, the company resulting from the merger of Chesapeake Energy Corporation and Southwestern Energy Company which closed on October 1, 2024, and/or its affiliates

1

DEFINITIONS

FASB	Financial Accounting Standards Board
FERC	Federal Energy Regulatory Commission
GAAP	Generally Accepted Accounting Principles in the United States
Generation	A 29-mile intrastate pipeline in northern Ohio and owned by NEXUS
GHG	Greenhouse gas
Guardian	Guardian Pipeline, L.L.C., a 263-mile interstate pipeline which connects to the Chicago Hub and serves key Wisconsin demand centers
Haynesville System	Pipeline and gathering system which is comprised of LEAP, Blue Union Gathering, and associated facilities
HCA	High consequence area
Inflation Reduction Act	The Inflation Reduction Act of 2022 (H.R. 5374)
LEAP	Louisiana Energy Access Project, a 211-mile gathering lateral pipeline that gathers Haynesville shale natural gas and delivers to markets in the Gulf Coast region
LIBOR	London Inter-Bank Offered Rates
LNG	Liquefied natural gas
Michigan System	A 335-mile pipeline system in northern Michigan
Midwestern	Midwestern Gas Transmission Company, a 402-mile bi-directional interstate pipeline which connects Appalachia supply to the Midwest market region between Tennessee and the Chicago Hub
Midwest Pipeline Acquisition	The transaction with ONEOK, pursuant to which DTM Interstate Transportation acquired 100% of the equity interests in each of Guardian, Midwestern and Viking
Millennium	Millennium Pipeline Intermediate Holdings LLC, a joint venture that, through its wholly owned subsidiary, Millennium Pipeline Company, LLC, owns a 266-mile interstate transportation pipeline and compression facilities serving markets in the northeast and supply from the northeast Marcellus region, in which DT Midstream owns a 52.5% interest
Mountain Valley Pipeline	A 303-mile natural gas pipeline owned by Mountain Valley Pipeline, LLC which spans from West Virginia to Virginia and transports natural gas from the Marcellus and Utica shale regions to markets in the southeastern United States
MVC	Minimum volume commitment
National Grid	National Grid Millennium LLC
NEPA	National Environmental Policy Act
NEXUS	NEXUS Gas Transmission, LLC, a joint venture that owns (i) a 256-mile interstate transportation pipeline and three compression facilities that transports Utica and Marcellus shale natural gas to Ohio, Michigan and Ontario market centers and (ii) Generation, in which DT Midstream owns a 50% interest
NGA	Natural Gas Act
NGPA	Natural Gas Policy Act
NWP 12	The U.S. Army Corps of Engineers Clean Water Act Section 404 Nationwide Permit 12
NYSE	New York Stock Exchange
Ohio Utica Gathering	A 20-mile gathering system, including compression and dehydration facilities, that gathers Utica shale natural gas from producer wells and delivers to a nearby processing plant
ONEOK	ONEOK, Inc., a publicly traded energy company engaged in the gathering, processing, storage, and transportation of natural gas, including through its ownership of ONEOK Partners Intermediate Limited Partnership and Border Midwestern Company
OSHA	The U.S. federal Occupational Safety and Health Act

2

DEFINITIONS

PHMSA	Pipeline and Hazardous Materials Safety Administration
RCRA	Resource Conservation and Recovery Act
Revolving Credit Facility	DT Midstream's secured revolving credit facility issued under the Credit Agreement
S&P 500 Index	Standard & Poor's 500 Index
SEC	Securities and Exchange Commission
Separation	The separation and spin-off of DT Midstream from DTE Energy, effective July 1, 2021
Separation and Distribution Agreement	The Separation and Distribution Agreement with DTE Energy was established before the Distribution to set forth DT Midstream's agreements with DTE Energy regarding the principal actions to be taken in connection with the Separation, as well as other agreements that govern aspects of DT Midstream's relationship with DTE Energy following the Separation
SOFR	Secured Overnight Financing Rate
South Romeo	South Romeo Gas Storage Company, LLC, a joint venture which owns the Washington 28 Storage Complex, in which DT Midstream owns a 50% interest
Stonewall	A 68-mile gathering lateral pipeline, in which DT Midstream owns an 85% interest, that gathers Marcellus and Utica shale natural gas and delivers to the Columbia Pipeline
Susquehanna Gathering	A 198-mile gathering system that gathers Marcellus shale natural gas and delivers to Bluestone
Tax Matters Agreement	The agreement that governs the respective rights, responsibilities and obligations of DTE Energy and DT Midstream after the Separation with respect to all tax matters
Tennessee Pipeline	Tennessee Gas Pipeline Company, LLC, owned by Kinder Morgan, Inc.
Term Loan Facility	DT Midstream's term loan facility issued under the Credit Agreement, which was repaid in 2024
Texas Eastern Pipeline	Texas Eastern Transmission, LP, owned by Enbridge Inc.
Tioga Gathering	A 3-mile gathering system that gathers shale natural gas to the Eastern Gas Transmission system
U.S.	United States of America
USD	United States Dollar ($)
Vector	Vector Pipeline LP, a joint venture that owns a 348-mile interstate transportation pipeline and five compression facilities connecting Illinois, Michigan, and Ontario market centers, in which DT Midstream owns a 40% interest
VIE	Variable Interest Entity
Viking	Viking Gas Transmission Company, a 674-mile bi-directional interstate pipeline which serves key utility customers in Minnesota, Wisconsin and North Dakota
Washington 10 Storage Complex	An interstate storage system located in Michigan with 94 Bcf of storage capacity, in which DT Midstream owns a 91% interest, and associated compression facilities
WOTUS	Navigable Waters Protection Rule under the U.S. federal Clean Water Act
2020 PIPES Act	Protecting Our Infrastructure of Pipelines and Enhancing Safety Act of 2020
2029 Notes	Senior unsecured notes of $1.1 billion in aggregate principal amount due June 2029
2031 Notes	Senior unsecured notes of $1.0 billion in aggregate principal amount due June 2031
2032 Notes	Senior secured notes of $600 million in aggregate principal amount due April 2032
2034 Notes	Senior secured notes of $650 million in aggregate principal amount due December 2034

3

FORWARD-LOOKING STATEMENTS

Certain information presented herein includes "forward-looking statements" within the meaning of the Private Securities Litigation Reform Act of 1995 with respect to the financial condition, results of operations, and businesses of DT Midstream. Words such as "believe," "expect," "expectations," "plans," "strategy," "prospects," "estimate," "project," "target," "anticipate," "will," "should," "see," "guidance," "outlook," "confident," and other words of similar meaning in connection with a discussion of future operating or financial performance may signify forward-looking statements. Forward-looking statements are not guarantees of future results and conditions, but rather are subject to numerous assumptions, risks, and uncertainties that may cause actual future results to be materially different from those contemplated, projected, estimated, or budgeted. Many factors may impact forward-looking statements of DT Midstream including, but not limited to, the following:

•changes in general economic conditions, including increases in interest rates and associated Federal Reserve policies, a potential economic recession, and the impact of inflation on our business;

•industry changes, including the impact of consolidations, alternative energy sources, technological advances, infrastructure constraints and changes in competition;

•changes in global trade policies and tariffs;

•global supply chain disruptions;

•actions taken by third-party operators, producers, processors, transporters and gatherers;

•changes in expected production from Expand Energy and other third parties in our areas of operation;

•demand for natural gas gathering, transmission, storage, transportation and water services;

•the availability and price of natural gas to the consumer compared to the price of alternative and competing fuels;

•our ability to successfully and timely implement our business plan;

•our ability to complete organic growth projects on time and on budget;

•our ability to finance, complete, or successfully integrate acquisitions;

•our ability to realize the anticipated benefits and manage the risks of the Midwest Pipeline Acquisition described herein;

•the price and availability of debt and equity financing;

•restrictions in our existing and any future credit facilities and indentures;

•the effectiveness of our information technology and operational technology systems and practices to detect and defend against evolving cyber attacks on United States critical infrastructure;

•changing laws regarding cybersecurity and data privacy, and any cybersecurity threat or event;

•operating hazards, environmental risks and other risks incidental to gathering, storing and transporting natural gas;

•geologic and reservoir risks and considerations;

•natural disasters, adverse weather conditions, casualty losses and other matters beyond our control;

•the impact of outbreaks of illnesses, epidemics and pandemics, and any related economic effects;

•the impacts of geopolitical events, including the conflicts in Ukraine and the Middle East;

•labor relations and markets, including the ability to attract, hire and retain key employee and contract personnel;

•large customer defaults;

•changes in tax status, as well as changes in tax rates and regulations;

4

FORWARD-LOOKING STATEMENTS

•the effects and associated cost of compliance with existing and future laws and governmental regulations, such as the Inflation Reduction Act;

•changes in environmental laws, regulations or enforcement policies, including laws and regulations relating to pipeline safety, climate change and GHG emissions;

•changes in laws, regulations or enforcement policies, including those relating to construction and operation of new interstate gas pipelines, ratemaking to which our pipelines may be subject, or other non-environmental laws and regulations;

•our ability to qualify for federal income tax credits by Clean Fuels Gathering;

•our ability to develop low carbon business opportunities and deploy GHG reducing technologies;

•changes in insurance markets impacting costs and the level and types of coverage available;

•the timing and extent of changes in commodity prices;

•the success of our risk management strategies;

•the suspension, reduction or termination of our customers’ obligations under our commercial agreements;

•disruptions due to equipment interruption or failure at our facilities, or third-party facilities on which our business is dependent; and

•the effects of future litigation.

The above list of factors is not exhaustive. New factors emerge from time to time. We cannot predict what factors may arise or how such factors may cause actual results to vary materially from those stated in forward-looking statements. Any forward-looking statements speak only as of the date on which such statements are made. We are under no obligation to, and expressly disclaim any obligation to, update or alter our forward-looking statements, whether as a result of new information, subsequent events or otherwise.

5

PART I

Items 1. and 2. Business and Properties

General

DT Midstream was incorporated in the state of Delaware in 2021. Our annual reports on Form 10-K, quarterly reports on Form 10-Q, current reports on Form 8-K, proxy statements, and all amendments to such reports are available free of charge through the Investors Relations page of DT Midstream's website: www.dtmidstream.com, as soon as reasonably practicable after they are filed with or furnished to the SEC. Additionally, the public may read and copy any materials that we file electronically with the SEC at www.sec.gov.

The DT Midstream Code of Conduct, Board of Directors' Code of Business Conduct and Ethics, Board of Directors' Governance Guidelines, Board of Directors' Committee Charters, and Categorical Standards for Director Independence are also posted on DT Midstream's website. The information on DT Midstream's website is not part of this report or any other report that DT Midstream files with, or furnishes to, the SEC.

Business Overview

We are an owner, operator, and developer of an integrated portfolio of natural gas midstream assets. We provide multiple, integrated natural gas services to customers through our interstate pipelines, intrastate pipelines, storage systems, gathering lateral pipelines including related treatment plants and compression and surface facilities, and gathering systems including related treatment plants, and compression and surface facilities. We also own joint venture interests in equity method investees which own and operate interstate pipelines that connect to our wholly owned assets. On December 31, 2024, we closed on the Midwest Pipeline Acquisition of three FERC-regulated natural gas transmission pipelines. See Note 16, "Acquisitions" to the Consolidated Financial Statements under Part II, Item 8 of this Form 10-K.

Our core assets strategically connect key demand centers in the Midwestern U.S., Eastern Canada and Northeastern U.S. regions to the premium production areas of the Marcellus/Utica natural gas formation in the Appalachian Basin and connect key demand centers and LNG export terminals in the Gulf Coast region to premium production areas of the Haynesville natural gas formation.

We have an established history of stable, long-term growth with contractual cash flows from customers that include natural gas producers, local distribution companies, electric power generators, industrials, and national marketers.

We believe that our properties are generally in good condition, well-maintained and suitable and adequate to carry on our business at capacity for the foreseeable future.

6

2024 Executive Summary

During the year ended December 31, 2024, DT Midstream's accomplishments and business developments included:

•Attained Net Income Attributable to DT Midstream of $354 million;

•Declared total cash dividends of $2.94 per common share;

•Closed on the Midwest Pipeline Acquisition of three FERC-regulated natural gas transmission pipelines, Guardian, Midwestern and Viking, from ONEOK for a purchase price of $1.2 billion on December 31, 2024. The pipelines have a total capacity of approximately 3.7 Bcf/d and 1,300 miles across seven states in the Midwest market region;

•To fund the Midwest Pipeline Acquisition, we:

◦Issued 4,168,750 common shares and received net proceeds of approximately $406 million;

◦Issued 5.800% senior secured notes due 2034 in aggregate principal amount of $650 million; and

◦Utilized our Revolving Credit Facility and cash on hand for the remaining purchase consideration;

•Placed the LEAP phase 3 expansion into service early and reached a final investment decision on the LEAP phase 4 expansion, which will increase the system capacity to 2.1 Bcf/d by the first half of 2026;

•Reached a final investment decision to construct an interconnect between Stonewall and the Mountain Valley Pipeline;

•Completed the Clean Fuels Acquisition and advanced the carbon capture and sequestration project in Louisiana through completion of the Class V test well;

•Credit rating was upgraded to investment-grade by Fitch Ratings and our outlook was upgraded to positive by both Moody's and S&P;

•Received a net distribution of $416 million from Millennium as a result of the issuance of senior unsecured notes;

•Repaid our remaining Term Loan Facility borrowings of $399 million;

•Amended the Credit Agreement to extend the Revolving Credit Facility maturity date to December 2029; and

•Published our third annual Corporate Sustainability Report. The information in our Corporate Sustainability Report is not incorporated by reference into this Form 10-K.

7

Our Strategy

Our principal business objective is to safely and reliably operate and develop natural gas assets across our premier footprint. Our proven leadership and highly engaged employees have an excellent track record. Prospectively, we intend to continue this track record by executing on our natural gas-centric business strategy focused on disciplined capital deployment and supported by a flexible, well capitalized balance sheet. Additionally, we intend to develop low carbon business opportunities and deploy GHG reducing technologies as part of our goal of being leading environmental stewards in the midstream industry. We are executing on a plan to achieve net zero carbon emissions by 2050.

Our strategy is premised on the following principles:

•Operate our assets in a sustainable and responsible manner. We believe that consistently serving our communities, customers, team members, and stakeholders is foundational.

•Provide exceptional service to our customers. We will continue to provide safe, highly reliable, timely and cost-competitive service, which is a key distinguishing competitive advantage.

•Disciplined capital deployment in assets supported by strong fundamentals. New capital spending will continue to go through a rigorous review process to ensure that it is accretive and deployed to assets serving high quality, low cost resources with proximity to strong demand centers, meeting our strategic criteria and expected returns.

•Capitalize on asset integration and utilization opportunities. We intend to leverage the scale and scope of our large asset platforms, our services, and our capabilities to increase efficiency across our portfolio and in the strategically situated natural gas basins in which we operate.

•Pursue economically attractive opportunities. We intend to pursue economically attractive expansion and acquisition opportunities that leverage our current asset footprint and strategic relationships with our customers.

•Grow cash flows supported by long-term firm service revenue contracts. We will continue pursuing opportunities that increase the demand-based component of our contract portfolio and will focus on obtaining additional long-term firm service commitments from customers, which may include fixed demand charges, MVCs and acreage dedications.

Our Operations and Business Segments

DT Midstream sets strategic goals, allocates resources, and evaluates performance based on the following two segments: Pipeline and Gathering. For financial information by segment for the last three years, see Note 14, "Segment and Related Information," to the Consolidated Financial Statements under Part II, Item 8 of this Form 10-K.

Expand Energy accounted for approximately 56% of our operating revenues for the year ended December 31, 2024. Our operating revenues do not include revenues of unconsolidated joint ventures accounted for as equity method investments.

8

Pipeline Segment

Description

Our Pipeline segment includes our interstate pipelines, intrastate pipelines, storage systems, gathering lateral pipelines including related treatment plants and compression and surface facilities. The Pipeline segment also includes joint venture interests in equity method investees which own and operate interstate pipelines that connect to our wholly owned assets. Our subsidiary companies own and operate these types of assets across multiple states and Eastern Canada.

Our interstate pipelines are FERC-regulated assets that transport natural gas from interconnected pipelines to power plants, local distribution companies and industrial end users, as well as interconnected pipelines for delivery to additional markets. Our intrastate pipelines are typically state-regulated assets that transport natural gas from interconnected pipelines to power plants, local distribution companies and industrial end users. Our gathering lateral pipelines are assets that gather natural gas for our customers from multiple central delivery points within a basin and redeliver that natural gas to interstate pipelines, intrastate pipelines, and LNG export terminals for further downstream transportation and, accordingly, perform a gathering function not subject to FERC jurisdiction. Our storage systems provide natural gas storage services for customers, subject to FERC jurisdiction. On December 31, 2024, we closed on the Midwest Pipeline Acquisition of three FERC-regulated natural gas transmission pipelines. See Note 16, "Acquisitions" to the Consolidated Financial Statements under Part II, Item 8 of this Form 10-K.

Revenues and Earnings from Equity Method Investees

DT Midstream primarily provides two types of pipeline and storage services: firm service and interruptible service. Firm service revenue contracts are typically long-term and structured using fixed demand charges or MVCs with fixed deficiency fee rates. This provides for fixed revenue commitments regardless of actual volumes of natural gas that flow, which leads to more stable operating performance, revenues and cash flows and limits our exposure to natural gas price fluctuations. For the year ended December 31, 2024, approximately 92% of our Pipeline revenue was generated under firm service revenue contracts and approximately 99% of the revenue of our unconsolidated joint ventures was generated under firm service revenue contracts. The earnings of our unconsolidated joint ventures are included in earnings from equity method investees in our Consolidated Statements of Operations. Interruptible service revenue contracts typically contain fixed rates, with total consideration dependent on actual natural gas volumes that flow.

For the year ended December 31, 2024, revenue from the Pipeline segment accounted for approximately 45% of our consolidated revenue. The cash flows from our Pipeline operations can be impacted in the short term by seasonality, weather fluctuations and the financial condition of our customers.

Competition

Our Pipeline operations compete for customers primarily based on geographic location, which determines connectivity and proximity to supply sources and end users, as well as price, operating reliability and flexibility, available capacity, and service offerings. Our primary competitors in the natural gas interstate pipelines and transmission market and in the gathering lateral pipelines market include major interstate pipelines and midstream companies that can transport and gather natural gas volumes between interstate systems and between central delivery points within a basin.

9

Properties

The following table presents certain information concerning our principal properties included in the Pipeline segment:

Property Classification	% Owned	Operator	Approximate Capacity (Bcf/d)	Approximate Compression Horsepower	Description	Location
Pipeline
FERC-Regulated Interstate Pipelines
Birdsboro	100%	Yes	0.2	—	A 14-mile interstate pipeline transporting gas supply to a gas-fired power plant in Pennsylvania	PA
Guardian (a)	100%	Yes	1.3	100,300	A 263-mile interstate pipeline which connects to the Chicago Hub and serves key Wisconsin demand centers	IL and WI
Midwestern (a)	100%	Yes	1.5	82,900	A 402-mile bi-directional interstate pipeline which connects Appalachia supply to the Midwest market region between Tennessee and the Chicago Hub	KY, IL, IN and TN
Millennium (b)	52.5%	No	1.9	84,400	A joint venture that owns a 266-mile interstate transportation pipeline and compression facilities serving markets in the northeast and supply from the northeast Marcellus region	NY
NEXUS (b)	50%	No	1.4	99,100	A joint venture that owns a 256-mile transportation pipeline and three compression facilities that transports Utica and Marcellus shale natural gas to Ohio, Michigan and Ontario market centers and Generation	OH and MI
Vector (b)	40%	No	2.8	120,000	A joint venture that owns a 348-mile pipeline and five compression facilities connecting Illinois, Michigan and Ontario market centers	Canada, IL, IN and MI
Viking (a)	100%	Yes	1.0	69,500	A 674-mile bi-directional interstate pipeline which serves key utility customers in Minnesota, Wisconsin and North Dakota	MN, ND and WI
Intrastate Pipelines
Generation	50%	No	0.4	—	A 29-mile intrastate pipeline in northern Ohio and owned by NEXUS	OH
FERC-Regulated Storage System
Washington 10 Storage Complex (c)	91%	Yes	N/A	26,200	An interstate storage system with 94 Bcf of storage capacity and associated compression facilities	MI
Gathering Lateral Pipelines
Bluestone	100%	Yes	1.2	33,200	A 65-mile gathering lateral pipeline, and two compression facilities, that gathers Marcellus shale natural gas to Millennium and the Tennessee Pipeline	PA and NY
LEAP	100%	Yes	1.9	27,000	A 211-mile gathering pipeline that gathers Haynesville shale natural gas to markets in the Gulf Coast region	LA
Michigan System	100%	Yes	0.8	2,400	A 335-mile pipeline system in northern Michigan	MI
Stonewall	85%	Yes	1.5	—	A 68-mile gathering lateral pipeline that gathers Marcellus and Utica shale natural gas to the Columbia Pipeline	WV

__________________________________

(a)The Midwest Pipeline Acquisition closed on December 31, 2024. See Note 16, "Acquisitions" to the Consolidated Financial Statements under Part II, Item 8 of this Form 10-K.

(b)We account for our ownership interest in these joint venture properties as equity method investments in accordance with GAAP. See Note 1, "Description of the Business and Basis of Presentation" to the Consolidated Financial Statements under Part II, Item 8 of this Form 10-K.

(c)The Washington 10 Storage Complex includes 16 Bcf of leased capacity from the Washington 28 Storage Complex, which is held by a joint venture, South Romeo, in which DT Midstream owns a 50% interest.

10

Business Updates

On December 31, 2024, we closed on the Midwest Pipeline Acquisition of three FERC-regulated natural gas transmission pipelines, Guardian, Midwestern and Viking, from ONEOK for a purchase price of $1.2 billion. The pipelines have a total capacity of approximately 3.7 Bcf/d and 1,300 miles across seven states in the Midwest market region. To fund the Midwest Pipeline Acquisition, we issued 4,168,750 common shares at a price to the public of $101.00 per share and received net proceeds of approximately $406 million and issued $650 million in aggregate principal amount of 5.800% senior secured notes due December 2034.

During the year ended December 31, 2024, we placed the LEAP phase 3 expansion into service and reached a final investment decision on the LEAP phase 4 expansion, which will increase the system capacity to 2.1 Bcf/d by the first half of 2026. We also reached a final investment decision to proceed on an interconnect between Stonewall and Mountain Valley Pipeline. Capital expenditure investments for our ongoing expansion projects are contemplated in our forecasted capital expenditures discussed under Part II, Item 7 "Management’s Discussion and Analysis of Financial Condition and Results of Operations—Capital Investments" of this Form 10-K.

In September 2024, Millennium closed on the sale of $800 million of senior unsecured notes with a weighted-average coupon rate of 5.88%. We received a distribution from Millennium of $416 million, net of fees and expenses, which reduced our investment balance under the equity method of accounting. We used the proceeds from the distribution to repay our existing indebtedness under our Term Loan Facility and for general corporate purposes. See Note 1, "Description of the Business and Basis of Presentation" to the Consolidated Financial Statements under Part II, Item 8 of this Form 10-K.

Gathering Segment

Description

Our Gathering segment includes gathering systems, related treatment plants, and compression and surface facilities. Our subsidiary companies own and operate these types of assets across multiple states.

Our natural gas gathering systems primarily consist of networks of pipelines that collect natural gas from points at or near our customers’ wells for delivery to plants for treating, to gathering pipelines for further gathering, or to pipelines for transportation. Natural gas is moved from the receipt points to the central delivery points on our gathering systems. We provide other ancillary services within our Gathering segment, including compression, dehydration, gas treatment, water impoundment, water transportation, water disposal, and sand mining. Our gathering systems provide a gathering function and are therefore not subject to FERC jurisdiction. Our gathering business has significant infrastructure within our customers' production acreage that is contractually dedicated to DT Midstream to provide gathering services. The Clean Fuels Gathering assets and results of operations after the July 1, 2024 acquisition date are presented in our Gathering segment. See Note 16, "Acquisitions" to the Consolidated Financial Statements under Part II, Item 8 of this Form 10-K.

Revenues

Our Gathering segment typically has firm revenue contracts that are long-term and structured using fixed demand charges or MVCs with fixed deficiency fee rates. This provides for fixed revenue commitments regardless of actual volumes of natural gas that flow, which leads to more stable operating performance, revenues and cash flows and limits our exposure to natural gas price fluctuations. Additional revenues are generated from proved developed producing reserves connected to our assets, which we refer to as "flowing gas." For the year ended December 31, 2024, approximately 54% and 45% of our Gathering segment revenue was generated under firm revenue contracts and flowing gas, respectively.

For the years ended December 31, 2024 and 2023, average throughput from the Gathering segment was 2.9 Bcf/d and 3.0 Bcf/d, respectively. For the year ended December 31, 2024, revenue from the Gathering segment accounted for approximately 55% of our consolidated revenue.

Competition

Our Gathering operations compete for customers based on reputation, operating reliability and flexibility, price and service offerings, including interconnectivity to producer-desired takeaway options (i.e., processing facilities and pipelines). We mitigate the risk of competition by signing acreage dedications, entering firm revenue contracts, expanding treating capacity and expanding our systems to desirable production basins. Competition customarily is impacted by the level of drilling activity in a particular geographic region. Our primary competitors include other independent midstream companies with gathering operations and producer owned systems.

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Properties

The following table presents certain information concerning our principal properties included in the Gathering segment:

Property Classification	% Owned	Operator	Approximate Capacity (Bcf/d)	Approximate Compression Horsepower	Description	Location
Gathering
Appalachia Gathering	100%	Yes	1.0	81,300	A 152-mile gathering system that gathers Marcellus shale natural gas to the Texas Eastern Pipeline and Stonewall	PA and WV
Blue Union Gathering	100%	Yes	2.6	81,600	A 427-mile gathering system that gathers shale natural gas from the Haynesville formation of Louisiana and Texas and delivers to markets in the Gulf Coast region; ancillary services include water impoundment, water transportation, water disposal, and sand	LA and TX
Clean Fuels Gathering	100%	Yes	0.0	6,000	A 77-mile gathering system that gathers and treats coal mine methane into pipeline quality natural gas	IL
Ohio Utica Gathering	100%	Yes	0.1	12,500	A 20-mile gathering system, including compression and dehydration facilities, that gathers Utica shale natural gas from producer wells to a nearby processing plant	OH
Susquehanna Gathering	100%	Yes	1.3	88,700	A 198-mile gathering system that gathers Marcellus shale natural gas to Bluestone	PA
Tioga Gathering	100%	Yes	0.1	—	A 3-mile gathering system that gathers shale natural gas to the Eastern Gas Transmission system	PA

Business Updates

During the first half of 2024, we placed the new Ohio Utica Gathering system into service. Additionally, we completed the Clean Fuels Acquisition and advanced our carbon capture and sequestration project in Louisiana through completion of the Class V test well. The carbon capture and sequestration Class VI permit application was transferred to the Louisiana Department of Energy and Natural Resources in February 2024, and we are awaiting the completion of their review.

Capital expenditure investments for our ongoing expansion projects are contemplated in our forecasted capital expenditures discussed under Part II, Item 7 "Management’s Discussion and Analysis of Financial Condition and Results of Operations—Capital Investments" of this Form 10-K.

Pipeline and Gathering Rights-of-Way

We obtain satisfactory title to the properties we own and use in our businesses, subject to liens for current taxes, liens incident to minor encumbrances, and easements and restrictions, which do not materially detract from the value of such property, the interests in those properties or the use of such properties in our businesses. Our storage facilities, treating and processing plants, compressor stations, offices and related facilities are located on real property owned or leased by us. In some cases, the real property we lease is on federal, state or local government land.

We typically obtain and maintain rights to construct and operate the pipelines on other people’s land under agreements that are perpetual or provide for renewal rights. Our pipelines are constructed on rights-of-way granted by the current record owners of such property. In many instances, lands over which rights-of-way have been obtained are subject to prior liens that have not been subordinated to the rights-of-way grants. All record owners have joined in the rights-of-way grants and signatures have been obtained, except in unusual cases where title is unclear and requires additional investigation.

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Human Capital Resources

DT Midstream recognizes that being innovative is necessary for our continued growth. We currently employ 556 employees, all of whom are employed full-time, exclusive of our student intern program. This includes approximately 150 employees who joined DT Midstream to support DTM Interstate Transportation as part of the Midwest Pipeline Acquisition. All of our employees are in the U.S., with our headquarters in Detroit, Michigan and locations in Illinois, Indiana, Kentucky, Louisiana, Minnesota, Ohio, Oklahoma, Pennsylvania, Tennessee, Texas, West Virginia, and Wisconsin. None of our employees are covered by collective bargaining agreements. We believe that our employee relations are good.

Know, Support and Respect Culture

Our human capital resources objectives center around employee engagement, fostering our culture, and leadership development, including training focused on our Know, Support and Respect Culture priorities discussed below. We maintain and grow our team using practices that help us identify, hire, incentivize, and retain our existing employees. Our employees have access to mentoring and educational development opportunities, including leadership development programs for emerging leaders identified at various levels within our corporate structure. Our executive leadership team meets annually with our Board of Directors' Organization and Compensation Committee to discuss executive leadership succession planning, including successor candidates and emerging leaders for management positions within the Company.

DT Midstream is committed to building an empowered and engaged team of the highest quality that delivers safe and reliable service to our customers. Rather than having stand-alone programs, we integrate these practices into our overall operating model and focus on the outcomes of Knowing, Supporting, and Respecting one another. We regularly review our representation demographics and engagement scores, and we evaluate our success based on our ability to advance our Know, Support and Respect Culture priorities:

•Know — Deliberately understanding the demographics and cultural norms of the communities where we live and operate;

•Support — Honestly understanding and listening to the perspectives and needs of all employees, regardless of location, position, or tenure - and developing strategic action plans based on annual engagement survey feedback; and

•Respect — Respect is required, so every employee will feel comfortable at work.

Health and Safety

The health and safety of people, including our employees, contractors, customers, and the communities we serve is our top priority. Our safety culture is maintained and strengthened by our safety team, which monitors events, compliance, and training activities.

We monitor our safety performance with leading and lagging indicators, such as safety observations, near-misses and the OSHA recordable injury metrics.

Compensation and Benefits Description

Our human capital resources objectives also include recruiting, incentivizing, fostering belonging, and retaining top talent. To achieve this, we offer all employees competitive compensation packages, annual and long-term incentive programs, defined contribution retirement savings plans and an employer contribution match, as well as paid time off, medical, dental, vision and other employee benefits. We review our compensation practices annually to ensure that pay is fair and internally equitable, and we believe our long-term incentive plan is important for our ability to attract, retain, motivate and reward employees. For additional information on the metrics used in our incentive plans, see Part III, Item 11 "Executive Compensation" of this Form 10-K.

For additional information on our approach to managing our human capital resources, see our 2024 Corporate Sustainability Report on our website. The information in our Corporate Sustainability Report is not incorporated by reference into this Form 10-K.

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Regulatory Environment

Our operations and investments are subject to extensive regulation by United States federal, state and local authorities. In addition, NEXUS and Vector are subject to applicable laws, rules, and regulations in Canada. Failure to comply with federal, state or local regulations may result in the imposition of administrative, civil and/or criminal remedies. We cannot predict whether a regulatory complaint or proceeding will be filed against us in the future or how a regulator may rule on any such complaint. We are not aware of any pending proceedings or complaints at this time.

Additional rules and legislation pertaining to these matters are considered and adopted from time to time. In certain instances, existing rules and legislation may be repealed or substantially modified in a way that reduces our regulatory compliance obligations. We cannot predict whether any such additional rules or legislation will be promulgated or enacted, whether any existing rules or legislation will be repealed or substantially modified, or what effect, if any, such changes might have on our operations, or existing regulatory requirements. To the extent that any new rules or legislation increase our regulatory compliance obligations, the industry could be required to incur additional capital expenditures and increased costs depending on future legislative and regulatory changes.

Federal Interstate Transportation & Storage Regulation

Many of our business operations are subject to extensive regulation by FERC under the NGA, the NGPA and regulations, rules and policies promulgated under those and other statutes. Specifically, Birdsboro, Guardian, Midwestern, Millennium, NEXUS, Vector, Viking and the Washington 10 Storage Complex are subject to FERC's NGA authority and provide interstate natural gas transportation or storage services in accordance with their FERC-approved tariffs. Notwithstanding the regulatory discussion below, we believe the regulatory burden does not currently affect our competitive condition.

Generally, FERC’s authority with respect to natural gas extends to:

•rates and charges for interstate pipelines and storage facilities as well as intrastate pipelines and storage facilities providing service in interstate commerce;

•terms and conditions of services and service contracts with customers;

•certification and construction of new interstate pipelines and storage services and facilities and expansion of such facilities;

•abandonment of interstate pipelines and storage services and facilities;

•maintenance of accounts and records;

•relationships between pipelines and certain affiliates;

•depreciation and amortization rates and policies;

•facility replacements and upgrades; and

•acquisitions and dispositions of interstate pipelines and storage facilities.

Under the NGA, rates charged by interstate pipelines must be just, reasonable, and not unduly discriminatory or preferential. The recourse rate is the maximum rate an interstate pipeline may charge for its services under its tariff. It is established through FERC’s cost-of-service ratemaking process. Generally, such recourse rates are based on the cost of providing service, including recovery of and a return on the pipeline’s cost of capital. Key determinants in the ratemaking process include the costs of providing service, the volumes of gas being transported, the rate design, the allocation of costs between services, the capital structure, the depreciation rate and the rate of return a natural gas company is permitted to earn. The maximum applicable recourse rates and terms and conditions for service on an interstate natural gas pipeline are set forth in the pipeline’s FERC-approved tariff unless market-based rates have been approved by FERC. Rate design and the allocation of costs also can affect a pipeline’s profitability. While the ratemaking process establishes the recourse rate, interstate pipelines such as some of our pipelines and storage systems are permitted to charge discounted rates, which are lower than the recourse rates, without further FERC authorization down to the minimum rate set forth in the tariff for the applicable service. If a pipeline company desires to change its recourse rates or terms and conditions of service, including pro forma contracts, then it

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must propose such changes to FERC in a filing made pursuant to Section 4 of the NGA. Such changes may be challenged by intervening parties, including customers and state agencies, and such proposed changes may ultimately be rejected by FERC.

Existing rates or terms and conditions of service and contracts also may be challenged by a complaint filed by interested persons, including customers, state agencies or FERC, under Section 5 of the NGA. Rate increases proposed by a pipeline may be allowed to become effective subject to refund and/or a period of suspension, while rates or terms and conditions of service that are the subject of a complaint under Section 5 of the NGA are subject only to prospective change by FERC. Any successful challenge against existing or proposed rates charged for our pipelines and storage services could materially adversely affect our business, financial condition and results of operations.

In addition, our interstate pipelines may also charge negotiated rates that may be above or below the recourse rate or that are subject to a different rate design than the rates specified in our interstate pipeline tariffs, provided that the pipeline has appropriate language in its tariff permitting negotiated rates, that affected customers are willing to agree to such rates rather than recourse rates, and that FERC has approved the negotiated rate agreement. A prerequisite for allowing the negotiated rates is that negotiated rate customers must have had the option to take service under the pipeline’s recourse rates. Some negotiated rate transactions are designed to fix the negotiated rate for the term of the firm transportation agreement and the fixed rate is generally not subject to adjustment for increased or decreased costs occurring during the contract term or for changes in the recourse rate during the contract term.

Interstate transportation and storage service agreements are required to conform, in all material respects, with the form of service agreements set forth in the pipeline’s FERC-approved tariff. Non-conforming agreements must be filed with, and accepted by, FERC. If FERC finds that an agreement is materially non-conforming, in whole or in part, it could reject, or require us to seek modification of, the agreement, or alternatively require us to modify our tariff so that the non-conforming provisions are generally available to all customers or class of customers.

Failure of an interstate pipeline to comply with its obligations under the NGA could result in the imposition of civil and criminal penalties. The EPAct 2005 amended the NGA to give FERC authority to impose civil penalties for violations of the NGA up to $1,584,648 per violation per day (as adjusted for inflation for 2025), and violators may be subject to criminal penalties of up to $1 million per violation per day and five years in prison.

To the extent that an intrastate pipeline system transports natural gas in interstate commerce, the rates, terms and conditions of such interstate transportation service are subject to FERC rules and regulations under Section 311 of the NGPA. Non-compliance with FERC’s rules and regulations established under Section 311 of the NGPA could result in the imposition of civil and criminal penalties. The EPAct 2005 also amended the NGPA to give FERC authority to impose civil penalties for violations of the NGPA up to $1,584,648 per violation per day (as adjusted for inflation for 2025), and violators may be subject to criminal penalties of up to $1 million per violation and five years in prison.

State Intrastate Transportation Regulation

Many state agencies possess the authority to review and authorize natural gas transportation transactions and the construction, acquisition, abandonment and interconnection of physical facilities for intrastate pipelines. State agencies also may regulate transportation rates, service terms, and conditions and contract pricing. Other state regulations may not directly apply to our business but may nonetheless affect the availability of natural gas for purchase, compression and sale. Regulations within a particular state generally will affect all intrastate pipeline operators within the state on a comparable basis; thus, we believe that the regulation of intrastate transportation in any state in which we operate will not disproportionately affect our operations.

Gathering Pipeline Regulation

Section 1(b) of the NGA exempts natural gas gathering facilities from regulation by FERC. We believe that our gathering systems meet the traditional tests FERC has used to establish a pipeline’s status as an exempt gatherer not subject to regulation as a FERC-jurisdictional natural gas company. If FERC were to consider the status of an individual facility and determine that the facility is not a gathering pipeline and the pipeline provides interstate transmission service, the rates for, and terms and conditions of, services provided by such facility would become subject to regulation by FERC under the NGA or the NGPA. Such regulation could decrease revenue, increase operating costs and, depending upon the facility in question, adversely affect our business, financial condition and results of operations. In addition, if any of our facilities were found to have provided

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services or otherwise operated in violation of the NGA or NGPA, this could result in the imposition of civil penalties as well as a requirement to disgorge charges collected for such service in excess of the rate established by FERC.

Our gathering assets may be subject to the rules and regulations of various state utility commissions. State regulation of gathering facilities generally includes various safety, environmental and, in some circumstances, nondiscriminatory take requirements and complaint-based rate regulation. States in which we operate may adopt ratable take and common purchaser statutes, which would require our gathering pipelines to take natural gas without undue discrimination in favor of one producer over another producer or one supply source over another similarly situated supply source. The regulations under these statutes may impose some restrictions on our ability as an owner of gathering facilities to decide with whom we contract to gather natural gas. States in which we operate may also adopt a complaint-based regulation of natural gas gathering activities, which allows natural gas producers and shippers to file complaints with state regulators in an effort to resolve grievances relating to gathering access and rate discrimination.

Our gathering operations could be adversely affected should they be subject in the future to different application of state regulation of rates and services. Our gathering operations also may be, or become, subject to additional safety and operational regulations relating to the design, installation, testing, construction, operation, replacement, and management of gathering facilities.

FERC and CFTC Enforcement

The EPAct 2005 amended the NGA and NGPA to prohibit fraud and manipulation in natural gas markets, and FERC issued a final rule making it unlawful for any entity, in connection with the purchase or sale of natural gas or transportation service subject to FERC’s jurisdiction, to defraud, make an untrue statement or omit a material fact, or engage in any practice, act or course of business that operates or would operate as a fraud. FERC’s anti-manipulation rules apply to interstate gas pipeline and storage companies and intrastate gas pipeline and storage companies that provide interstate services, such as Section 311 service, as well as otherwise non-jurisdictional entities to the extent the activities are conducted "in connection with" gas sales, purchases or transportation subject to FERC jurisdiction. The anti-manipulation rules apply to intrastate sales and gathering activities only to the extent that there is a "nexus" to FERC-jurisdictional transactions. The EPAct 2005 also provided FERC with the authority to impose civil penalties, which, as adjusted for inflation for 2025, is currently up to a maximum of $1,584,648 per violation per day.

In addition, the CFTC is directed under the Commodities Exchange Act to prevent price manipulations for the commodity and futures markets, including the energy futures markets. Pursuant to the Dodd-Frank Act and other authority, the CFTC has adopted anti-market manipulation regulations that prohibit fraud and price manipulation in the commodity and futures markets. The CFTC also has statutory authority to seek civil penalties of up to the greater of approximately $1.5 million (as adjusted for inflation for 2025) or triple the monetary gain to the violator for violations of the anti-market manipulation sections of the Commodities Exchange Act.

Pipeline Safety and Maintenance Regulation

Our natural gas pipeline assets are subject to the pipeline safety regulations implemented by PHMSA. PHMSA establishes and implements minimum federal safety standards and reporting requirements applicable to gas pipeline facilities, including associated underground natural gas storage. These standards include requirements that apply to the design, installation, testing, construction, operation and maintenance, operator qualification as well as requirements for integrity management on certain pipelines. The integrity management programs apply to gas transmission line segments located in HCAs and require operators to perform periodic risk-based assessments in addition to the minimum required inspections and other preventative and mitigation measures. Notwithstanding the investigatory and preventative maintenance costs incurred in our performance of customary pipeline management activities, we may incur significant additional expenses if anomalous pipeline conditions are discovered or additional preventative and mitigation measures need to be implemented.

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PHMSA often issues new or amended safety standards and reporting requirements for gas pipeline facilities. For example, the "Safety of Gas Transmission Pipelines: MAOP Reconfirmation, Expansion of Assessment Requirements, and Other Related Amendments" rule, which became effective July 1, 2020, requires operators of certain gas transmission pipelines to reconfirm maximum allowable operating pressure and establishes "Moderate Consequence Areas" for determining regulatory requirements for gas transmission pipeline segments outside of HCAs. The rule also establishes new requirements for conducting periodic integrity assessments outside of HCAs and incorporates industry standards and guidelines as well as new requirements for integrity management programs. In August 2022, PHMSA published the "Safety of Gas Transmission Pipelines: Repair Criteria, Integrity Management Improvements, Cathodic Protection, Management of Change, and Other Related Amendments" rule, effective May 24, 2023, which increases gas integrity management and corrosion control requirements and establishes repair criteria for pipelines outside of HCAs, among other things. We have revised our operating and inspection procedures to address these requirements and have implemented these changes as required by the rules. We may incur additional expenses related to compliance activities associated with this rule but do not expect these expenses to be material.

In November 2021, PHMSA issued another final rule, entitled "Safety of Gas Gathering Pipelines: Extension of Reporting Requirements, Regulation of Large, High-Pressure Lines, and Other Related Amendments," effective May 16, 2022, that established new safety standards and reporting requirements for certain historically unregulated onshore gas gathering lines. The final rule created a new Type C category of regulated onshore gas gathering lines in Class 1 locations that are subject to PHMSA’s safety standards and reporting requirements and required operators to comply with certain regulatory requirements applicable to newly designated Type C gas gathering lines by May 16, 2023. The final rule also created a new Type R category of reporting-only onshore gas gathering pipelines that are subject to PHMSA’s incident and annual reporting requirements. We have revised our operating and maintenance procedures to address these requirements and have implemented these changes. We may incur additional expenses related to compliance activities but do not expect these expenses to be material.

Additionally, in April 2022, PHMSA published the "Pipeline Safety: Requirement of Valve Installation and Minimum Rupture Detection Standard" rule, effective October 5, 2022, which required installation of remote control or automatic shut-off valves (or alternative equivalent technology) on certain newly constructed or replaced gas transmission pipelines. The final rule also imposed minimum performance standards for operation of those valves. We may incur additional expenses related to the requirements imposed by this rule, but do not expect these expenses to be material.

PHMSA is in the process of developing regulations to address congressional mandates set forth in the 2020 PIPES Act and for other purposes. For example, in May 2023, PHMSA issued a Notice of Proposed Rulemaking, entitled "Gas Pipeline Leak Detection and Repair," that proposes amendments to implement a congressional mandate in the 2020 PIPES Act and impose leak detection and repair criteria applicable to gas pipelines and underground natural gas storage facilities. The final rule was submitted for publication in the Federal Register in January 2025 but has since been withdrawn for further review by PHMSA with no timeframe for a final rule. PHMSA is also in the process of revising regulations applicable to requirements for operators in response to certain class location changes and developing a proposed rule to establish inspection and maintenance requirements for idled pipelines. Congress was due to reauthorize the Pipeline Safety Act in 2023, but that process has been delayed until 2025. Through reauthorization of the Pipeline Safety Act, Congress may pass a bill that mandates other statutory changes or directs PHMSA to develop additional rulemaking. The adoption of these new PHMSA rules could impact our pipeline assets and operations by requiring the installation of new or modified safety controls and the implementation of new capital projects or accelerated maintenance programs, all of which could require us to incur increased operational costs that could be significant. We may also be affected by lost cash flows resulting from shutting down our pipelines during the pendency of any repairs and any testing, maintenance, and repair of pipeline facilities downstream from our own facilities.

Every state in which we operate is certified by PHMSA to regulate the safety of intrastate gas pipeline facilities consistent with the federal safety standards, and some of these states apply additional or more stringent safety standards or reporting requirements to intrastate gas pipeline facilities in their respective jurisdictions. We may incur significant costs and liabilities associated with repair, remediation, preventive or mitigation measures associated with complying with these additional or more stringent state requirements, including for certain gas gathering lines or other pipeline facilities that are not currently subject to PHMSA’s regulations. The costs, if any, for repair, remediation, preventive or mitigating actions that may be determined to be necessary, as well as lost cash flows resulting from shutting down our pipelines during the pendency of such actions, could be material.

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We incur significant costs in complying with U.S. federal and state pipeline safety laws and regulations and otherwise administering our pipeline safety program, but we do not believe such costs of compliance will materially adversely affect our business, financial condition and results of operations. While we cannot predict the outcome of pending or future legislative or regulatory initiatives, we anticipate that pipeline safety requirements will continue to become more stringent over time. As a result, we may incur significant additional costs to comply with the new pipeline safety regulations, the pending pipeline safety regulations, and any new pipeline safety laws and regulations associated with our pipeline facilities, which could materially adversely affect our business, financial condition and results of operations.

Should we fail to comply with PHMSA regulations, we could be subject to penalties and fines. PHMSA has the statutory authority to impose civil penalties for pipeline safety violations up to a maximum of approximately $272,926 per day for each violation and approximately $2.73 million for a related series of violations (as adjusted for inflation as prescribed in 2025). This maximum penalty authority established by statute will continue to be adjusted periodically to account for inflation.

Our operations are in substantial compliance with all existing U.S. federal, state and local pipeline safety laws and regulations. However, the adoption of new laws and regulations, such as those proposed by PHMSA, could result in significant added costs or delays in service or the termination of projects, which could have a material adverse effect on us in the future.

In the course of operating our pipeline facilities, we may experience a leak or a rupture on our system. These leaks and ruptures may cause explosions, fire, damage to the environment, damage to property, personal injury and/or death. Depending on the circumstances of the leak or rupture, PHMSA or the state agent may require that certain pipeline assets remain out of service and/or operate at a significantly reduced operating pressure until certain corrective measures are performed and a return to normal operation is approved by PHMSA or the state agent. In addition to any regulatory fines or corrective measures, we may be sued for any damages. Depending upon the facts and circumstances of a particular incident, state and federal regulatory authorities may also seek civil and/or criminal fines and penalties.

Natural Gas Storage Regulation

We operate natural gas storage facilities in Michigan as interstate facilities regulated by PHMSA and provide interstate storage and related services pursuant to a FERC-approved tariff. As such, our natural gas storage facilities are required to meet the federal safety standards as required by 49 C.F.R. §192.12, Underground natural gas storage facilities. New regulations that may expand requirements for underground natural gas storage facilities are still under development by PHMSA based on the May 2023 PHMSA Notice of Proposed Rulemaking entitled "Gas Pipeline Leak Detection and Repair." PHMSA submitted a final rule for publication in the Federal Register in January 2025, which was subsequently withdrawn for further review by PHMSA with no projected timeframe for finalizing the regulations.

Our operations are in substantial compliance with 49 C.F.R. §192.12, Underground natural gas storage facilities. However, the adoption of new laws and regulations could result in significant added costs or delays in service or the termination of projects, which could have a material adverse effect on us in the future.

Environmental and Occupational Health and Safety Regulations

General. Our operations are subject to U.S. federal, state and local environmental laws and regulations relating to air quality, water quality, waste management, wildlife conservation, natural resources and worker health and safety. These laws and regulations require the acquisition of and compliance with permits and the installation of pollution control equipment or replacement of aging pipelines and other facilities; limit or prohibit construction activities in sensitive areas such as wetlands, wilderness or areas that provide habitat for endangered or threatened species; require investigatory and remedial actions to mitigate or eliminate pollution conditions caused by our operations or attributable to former operations; and apply health and safety criteria addressing worker protections.

In addition, our operations and construction activities are subject to county and local ordinances that restrict the time, place or manner in which those activities may be conducted to reduce or mitigate nuisance-type conditions, such as, for example, excessive levels of dust or noise or increased traffic congestion.

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Failure to comply with these laws and regulations may result in the assessment of administrative, civil and criminal penalties; the occurrence of delays or cancellations in the permitting or performance or expansion of projects; the denial or termination of project authorizations; the imposition of restrictions or limitations on project authorizations; the addition or removal of conditions or terms in project authorizations; the issuance of injunctions limiting or preventing some or all of our operations in a particular area; and, under certain environmental laws, citizen suits, in which individuals and environmental organizations act in the place of the government and sue operators for alleged violations of environmental law.

We have implemented programs and policies designed to keep our pipelines and other facilities in compliance with existing environmental laws and regulations, and we incur significant costs in connection with compliance. We also incur, and expect to continue to incur, additional costs with respect to construction as existing environmental laws and regulations impact the cost of planning, design, permitting, installation and start-up, and with respect to capital expenditures for pollution control equipment that is necessary to achieve emission and discharge standards included in our permits.

Moreover, we incur, and expect to continue to incur, additional costs in connection with spill response. Spills can result in significant costs associated with the investigation and remediation of contaminated facilities, and with injury and damage claims arising from releases and related contamination.

The timing and complete extent of future expenditures related to environmental matters is difficult to estimate accurately because, among other things, interpretation and enforcement of environmental laws and regulations are constantly changing, our pollution control and clean-up cost estimates may change, especially when our current estimates are based on preliminary site investigations or agreements, and new contaminated facilities and sites may be found, or what we know about existing sites and facilities could change.

We do not believe that our compliance with environmental legal requirements will materially adversely affect our business, financial condition and results of operations. Nonetheless, the trend in environmental regulation is to place more restrictions and limitations on activities that may affect the environment. Thus, there can be no assurance as to the amount or timing of future expenditures for environmental compliance or remediation, and actual future expenditures may be significantly in excess of the amounts we currently anticipate. For example, we try to anticipate future regulatory requirements that might be imposed and plan accordingly to remain in compliance with changing environmental laws and regulations and to minimize the costs of such compliance. While we are in substantial compliance with existing environmental laws and regulations, additional, unplanned measures and expenditures may be required to maintain compliance in the future.

The following is a discussion of several of the principal environmental laws and regulations, as amended from time to time, which relate to our business.

Hazardous Substances and Waste. CERCLA and comparable state laws impose liability, without regard to fault or the legality of the original conduct, on current and prior owners or operators of the sites where a release of hazardous substances occurred or extends and companies that transported, disposed or arranged for the transportation or disposal of the hazardous substances released. Under CERCLA, these "responsible parties" may be subject to strict and joint and several liability for the costs of cleaning up the hazardous substances that have been released into the environment, for damages to natural resources, and for the costs of certain health studies. CERCLA also authorizes the EPA and, in some instances, third parties to act in response to threats to the public health or the environment and to seek to recover from the responsible parties the costs they incur. It is not uncommon for neighboring landowners and other third parties to file claims for personal injury and property damage allegedly caused by hazardous substances or other pollutants released into the environment. We generate materials in the course of our ordinary operations that are regulated as "hazardous substances" under CERCLA or similar state laws and, as a result, may be jointly and severally liable under CERCLA, or such laws, for all or part of the costs required to clean up sites at which these hazardous substances have been released into the environment.

In the ordinary course of our operations, we generate solid wastes and in some instances hazardous wastes, which are subject to the requirements of RCRA and comparable state statutes. While RCRA regulates both solid and hazardous wastes, it imposes strict requirements on the generation, storage, treatment, transportation and disposal of hazardous wastes. While certain petroleum production wastes are excluded from RCRA’s hazardous waste regulations, it is possible that these wastes will in the future be designated as "hazardous wastes" and be subject to more rigorous and costly disposal requirements, which could have a material adverse effect on our maintenance capital expenditures and operating expenses.

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We own, lease or operate properties where hydrocarbons are being or have been handled for many years, by us and by former owners or operators, and we send hydrocarbons and wastes to third-party sites for treatment or disposal. Under CERCLA, RCRA and analogous state laws, we could be required to remove or remediate previously disposed or released wastes (including wastes disposed of or released by prior owners or operators), to clean up contaminated property (including contaminated groundwater) or to perform remedial operations to prevent future contamination, as well as to reimburse for or contribute to the remediation of third-party disposal and treatment sites. We are not currently aware of any facts, events or conditions relating to the application of such requirements that could reasonably materially adversely affect our business, financial condition and results of operations.

Air Emissions. The U.S. federal Clean Air Act and comparable state laws and regulations restrict the emission of air pollutants from various industrial sources, including our compressor stations, and also impose various pre-construction, operational, monitoring and reporting requirements. Such laws and regulations may require that we obtain pre-approval for the construction or modification of certain projects or facilities, obtain and strictly comply with air permits containing various emissions and operational limitations, and utilize specific emission control technologies to limit emissions. Our failure to comply with these requirements could subject us to monetary penalties, injunctions, conditions or restrictions on operations and, potentially, criminal enforcement actions. We may be required to incur certain capital expenditures in the future for air pollution control equipment in connection with obtaining and maintaining permits and approvals for air emissions. Compliance with these requirements may require modifications to certain of our operations, including the installation of new equipment to control emissions from our compressors that could result in significant costs, increased capital expenditures and operating costs, and could adversely affect our business. Further, the permitting, regulatory compliance and reporting programs, taken as a whole, increase the costs and complexity of oil and gas operations with potential to adversely affect the cost of doing business for our customers resulting in reduced demand for our gas processing and transportation services. Although we can give no assurances, we believe such requirements will not materially adversely affect our business, financial condition and results of operations, and the requirements are not expected to be more burdensome to us than to any similarly situated midstream company.

Climate Change. Legislative and regulatory measures to address climate change and GHG emissions are in various phases of discussion or implementation. The EPA regulates GHG emissions from new and modified facilities that are potential major sources of criteria pollutants under the Clean Air Act’s Prevention of Significant Deterioration and Title V programs and has adopted regulations that require, among other things, preconstruction and operating permits for certain large stationary sources and the monitoring and annual reporting of GHGs from certain onshore oil and natural gas production sources. On December 2, 2023, the EPA published a final rule to regulate GHG emissions (in the form of methane limitations, as well as design, equipment, work practice, and operational standards) and volatile organic compound emissions from crude oil and natural gas production, processing, transmission, and storage. The final rule includes standards of performance for new, modified, and reconstructed sources and emission guidelines for existing sources. Additionally, the U.S. Congress, along with U.S. federal and state agencies, has considered measures to reduce the emissions of GHGs. On August 16, 2022, the U.S. Congress enacted the Inflation Reduction Act, pursuant to which EPA issued regulations (announced November 12, 2024) that impose a charge on methane emissions that exceed certain thresholds from offshore and onshore petroleum and natural gas production, onshore natural gas processing, onshore natural gas transmission compression, certain kinds of natural gas and LNG storage, and onshore petroleum and natural gas gathering and boosting. Legislation or regulation that levies a charge related to our GHG emissions or that restricts GHG emissions could increase our cost of environmental compliance by requiring us to install new equipment to reduce emissions from larger facilities; purchase emission allowances; administer and manage a GHG emissions program; and otherwise increase the costs of our operations, including costs to operate and maintain our facilities.

FERC does not directly regulate GHG emissions. However, on February 17, 2022, FERC issued two policy statements providing guidance on its consideration of GHG emissions and other factors when reviewing proposed projects under the NGA. These policy statements have been the subject of public comments. On January 24, 2025, FERC issued an order terminating the Consideration of Greenhouse Gas Emissions in Natural Gas Infrastructure Project Reviews proceeding. FERC instead said it will address GHG emissions issues on a case by case basis. It is unclear at this point the impacts that termination of this proceeding will have on FERC’s processing of certificate applications.

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PHMSA is also working on a Congressionally-mandated rulemaking that is designed to impose leak detection and repair criteria in order to reduce GHG emissions associated with PHMSA-regulated gas pipeline facilities and underground natural gas storage facilities. PHMSA submitted a final rule for publication in the Federal Register in January 2025, which has since been withdrawn for further review by PHMSA with no timeframe for finalizing the regulations. This rulemaking process could undergo significant revisions and a final rule may not be issued in 2025. If this rulemaking is finalized, we may incur additional expenses related to the requirements imposed by this rule, but do not expect these expenses to be material.

The effect of climate change legislation or regulation on our business is currently uncertain. If we incur additional costs to comply with such legislation or regulations, we may not be able to pass on the higher costs to our customers or recover all the costs related to complying with such requirements, and any such recovery may depend on events beyond our control, including the outcome of future rate proceedings before FERC or state regulatory agencies and the provisions of any final legislation or implementing regulations. Our future business, financial condition and results of operations could be adversely affected if such costs are not recovered through regulated rates or otherwise passed on to our customers. Additionally, our customers or suppliers may also be affected by legislation or regulation, which may adversely impact their drilling schedules and production volumes and reduce the volumes delivered to us and demand for our services.

Climate change and GHG legislation or regulation could also delay or otherwise negatively affect efforts to obtain permits and other regulatory approvals with regard to existing and new facilities or impose additional monitoring and reporting requirements. The effect of any new legislative or regulatory measures on us will depend on the particular provisions that are ultimately adopted.

Water Discharges. The U.S. federal Clean Water Act and analogous state laws impose restrictions and strict controls regarding the discharge of pollutants or dredged and fill material into state waters as well as WOTUS, including adjacent wetlands. The discharge of pollutants into regulated waters is prohibited, except in accordance with the terms of permits issued by the EPA, the U.S. Army Corps of Engineers, and/or an analogous state agency. The definition of WOTUS has been the subject of multiple regulatory interpretations and judicial decisions in recent years. In May 2023, the U.S. Supreme Court issued its decision in Sackett v. Environmental Protection Agency, which adopted a narrower test for wetlands covered under the Clean Water Act; and, in August 2023, the EPA and the U.S. Army Corps of Engineers promulgated final rule amendments for a new WOTUS definition that conformed to the Supreme Court's Sackett decision. Despite these recent changes, the definition remains subject to litigation, with opponents arguing it is not sufficiently narrow. While recent changes to the definition may ease permitting in certain circumstances, continued controversy over the WOTUS definition may result in uncertainty, costs and delays with respect to obtaining permits for activities in jurisdictional waters, including wetlands.

Spill prevention, control and countermeasure requirements of U.S. federal laws require appropriate containment berms and similar structures to help prevent the contamination of regulated waters in the event of a hydrocarbon spill, rupture or leak. In addition, the Clean Water Act and analogous state laws require individual permits or coverage under general permits for discharges of storm water runoff from certain types of facilities. These permits may require us to monitor and sample the storm water runoff from some of our facilities. The Clean Water Act and regulations implemented thereunder also prohibit discharges of dredged and fill material in wetlands and other waters of the U.S. unless authorized by an appropriately issued permit. Some states also maintain groundwater protection programs that require permits for discharges or operations that may impact groundwater conditions. U.S. federal and state regulatory agencies can impose administrative, civil and criminal penalties for non-compliance with discharge permits or other requirements of the Clean Water Act and analogous state laws. We believe that compliance with existing permits and foreseeable new permit requirements will not materially adversely affect our business, financial condition and results of operations.

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National Environmental Policy Act. The construction of interstate natural gas transportation pipelines pursuant to the NGA requires authorization from FERC. Certain FERC actions relating to such pipelines are subject to NEPA, which requires U.S. federal agencies, such as FERC, to evaluate major U.S. federal actions having the potential to significantly affect the environment. During such evaluations, an agency will prepare a detailed Environmental Impact Statement unless it has found on the basis of an environmental assessment that no significant effect is likely. Such NEPA analyses have the potential to significantly delay or limit, and significantly increase the cost of, development of midstream infrastructure. On April 20, 2022, the White House Council on Environmental Quality published a final rule amending its existing regulations governing the implementation of NEPA by federal agencies. The amendments principally address definitions relating to environmental effects and alternatives that require agency consideration. On January 9, 2023, the Council published interim guidance, effective immediately, that addresses how federal agencies should consider GHG emissions and climate change when conducting reviews under NEPA. The interim guidance recommends that agencies quantify GHG emissions and then use an algorithm to translate the emissions into an expected social cost. On June 3, 2023, the federal government enacted the Fiscal Responsibility Act of 2023, which includes amendments to NEPA concerning the scope and scientific basis of impact analysis, the duration of impact reviews, and other matters. On May 1, 2024, the Council published a second rule, further amending its NEPA implementing regulations. This rule addresses a wide range of topics, including the implementation of the statutory amendments passed in 2023 and the replacement of numerous regulatory measures adopted during the prior presidential administration. The Council’s rulemaking and policy efforts generally require agencies to undertake more searching inquiries during their NEPA reviews of new projects that require federal permits. However, the scope and detail of NEPA requirements may change as pending court cases are resolved. For example, a challenge to the Council’s May 2024 rule is underway in federal court in North Dakota. In a separate case, the federal court of appeals in Washington D.C. ruled in November 2024 that the Council’s regulations exceed the Council’s authority and do not bind the federal agencies. Petitions for rehearing are pending before the appellate court, and the ultimate import of that decision is unclear. On December 10, 2024, the U.S. Supreme Court heard argument in Seven County Infrastructure Coalition v. Eagle County, Colorado, in which petitioners seek to reverse a recent trend in courts requiring more extensive NEPA reviews, particularly related to indirect and downstream impacts of new infrastructure projects. The outcomes of these cases are uncertain.

Hydraulic Fracturing. We do not operate any assets that conduct hydraulic fracturing. However, our customers’ natural gas production is developed from unconventional sources that require hydraulic fracturing as part of the completion process. Hydraulic fracturing involves the injection of water, sand and chemicals under pressure into the formation to fracture the surrounding rock and stimulate crude oil and natural gas production. The process is regulated by state agencies, typically the state’s commission that regulates oil and gas production. A number of U.S. federal agencies, including the EPA and the U.S. Department of Energy, have analyzed, or have been requested to review, a variety of environmental issues associated with hydraulic fracturing. For example, the EPA finalized regulations under the Clean Water Act in June 2016 prohibiting wastewater discharges from hydraulic fracturing and certain other natural gas operations to publicly owned wastewater treatment plants. In addition, some states have adopted, and other states are considering adopting, regulations that could impose more stringent disclosure and/or well construction requirements on hydraulic fracturing operations.

Certain state and U.S. federal regulatory agencies are also focused on a possible connection between hydraulic fracturing-related activities, including wastewater disposal, and the increased occurrence of seismic activity. When caused by human activity, such events are called induced seismicity. In a few instances, operators of injection disposal wells in the vicinity of seismic events have been ordered by regulatory agencies to reduce injection volumes or suspend operations. Additionally, some state regulatory agencies have modified their regulations or issued orders to restrict disposal wells or enhance well construction and monitoring requirements.

These developments could result in additional regulation and restrictions on the use of injection disposal wells and hydraulic fracturing. The adoption of new laws, regulations or ordinances at the U.S. federal, state or local levels imposing more stringent restrictions on hydraulic fracturing or wastewater disposal could make it more difficult for our customers to complete natural gas wells, increase customers’ costs of compliance and doing business, and otherwise adversely affect the hydraulic fracturing services they perform, which could negatively impact demand for our services.

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Endangered Species Act. The ESA restricts activities that may adversely affect endangered and threatened species or their habitats and it makes illegal the "take" of any protected species. U.S. federal agencies are required to ensure that any action authorized, funded or carried out by them is not likely to jeopardize the continued existence of listed species or modify their critical habitat. While some of our facilities are located in areas that are designated as habitats for endangered or threatened species, we have not incurred any material costs to comply or restrictions on our operations and we believe that we are in substantial compliance with the ESA. The designation of previously unprotected species as being endangered or threatened, or the designation of previously unprotected areas as a critical habitat for such species, could cause us to incur additional costs, result in delays in construction of pipelines and facilities, cause us to become subject to operating restrictions in areas where the species are known to exist or could result in limitations on our customers’ exploration and production activities that could have an adverse impact on demand for our services. For example, the U.S. Fish and Wildlife Service has received hundreds of petitions to consider listing additional species as endangered or threatened and is being regularly sued or threatened with lawsuits to address these petitions. Compliance with all applicable laws providing special protection for designated species has not posed a material cost on our business and operations to date.

Employee Health and Safety. We are subject to a number of U.S. federal and state laws and regulations, including OSHA, and comparable state statutes, whose purpose is to protect the health and safety of workers. In addition, the OSHA hazard communication standard, the EPA community "right-to-know" regulations, and comparable state laws and regulations require that information be maintained concerning hazardous materials used or produced in our operations and that this information be provided to employees, state and local government authorities and citizens. We are also subject to OSHA Process Safety Management regulations, which are designed to prevent or minimize the consequences of catastrophic releases of toxic, reactive, flammable or explosive chemicals. We are also subject to the EPA Risk Management Program, which addresses the prevention of chemical accidents and preparedness for emergencies. In February 2024, the EPA issued a final rule amending the Risk Management Program’s implementing regulations. The amended regulations impose numerous new or heightened requirements concerning incident investigations, third-party compliance auditing, consideration of alternative chemicals and technologies, and evaluation of risks from natural hazards and climate change, among other issues.

We are in substantial compliance with all applicable laws and regulations relating to worker health and safety. Historically, worker safety and health compliance costs have not materially adversely affected our business, financial condition and results of operations; however, there can be no assurance that such costs will not be material in the future or that such future compliance will not materially adversely affect our business, financial condition and results of operations. While we may increase future expenditures to comply with higher industry and regulatory safety standards, such increases in costs of compliance, and the extent to which they might be recoverable through our rates, cannot be estimated at this time.

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Item 1A. Risk Factors

You should carefully consider the following risks and other information in this Form 10-K. Any of the following risks and uncertainties could materially adversely affect our business, financial condition and results of operations.

Risks Relating to Our Business

Operational Risks

Any significant decrease in production or in demand of natural gas in our asset footprint could materially adversely affect our business, financial condition and results of operations.

Our business is dependent on the continued availability of and demand for natural gas in our areas of operation, which include the Midwestern U.S., Canada, Northeastern U.S. and Gulf Coast regions.

To maintain or increase the contracted capacity or the volume of natural gas gathered, transported and stored on our systems and cash flows associated therewith, our customers must continually obtain adequate supplies of natural gas. If new supplies of natural gas are not obtained to replace the natural decline in volumes from existing supply basins in our areas of operation, or if natural gas supplies are diverted to serve other markets, the overall volume of natural gas gathered, transported and stored on our systems would decline. The primary factors affecting our ability to obtain sources of natural gas include (i) the level of successful drilling activity near our systems, (ii) our ability to compete for volumes from successful new wells and (iii) our ability to compete successfully for volumes from sources connected to other pipelines. A reduction in the natural gas volumes supplied by producers for any of the factors mentioned above as well as national, regional, local, economic and political factors, including tariffs and periods of changing inflation, could result in reduced throughput on our systems and corresponding service revenues, which could materially adversely affect our business, financial condition and results of operations.

In addition, demand for our services is dependent on the demand for gas in the markets we serve. Alternative fuel sources such as electricity, coal, fuel oils, or nuclear energy, as well as technological advances and renewable sources of energy, could reduce demand for natural gas in our markets and have an adverse effect on our business. Government imposed constraints, such as changes in regulatory policy and permitting and environmental limitations, could also artificially limit new demand for natural gas, which could materially adversely affect our business, financial condition and results of operations.

We have one key customer, Expand Energy. The loss of, or reduction in volumes from, this customer could result in a decline in demand for our services and materially adversely affect our business, financial condition and results of operations.

Expand Energy accounted for approximately 56% of our operating revenues for the year ended December 31, 2024. Our operating revenues do not include revenues of unconsolidated joint ventures accounted for as equity method investments. The loss of all or even a portion of the contracted volumes of this or other customers, the failure to extend or replace customer contracts, or the extension or replacement of customer contracts on less favorable terms, as a result of competition, creditworthiness, reduced natural gas production or otherwise, could materially adversely affect our business, financial condition and results of operations.

We may be unable to renew or replace expiring contracts at favorable rates or on a long-term basis.

One of our exposures to market risk occurs when our existing contracts, including both our contracts with customers and our contracts with suppliers and other counterparties, expire and are subject to renegotiation and renewal. The majority of our customer contracts are firm service revenue contracts. Firm service revenue contracts are typically long-term and structured using fixed demand charges or MVCs with fixed deficiency fee rates. This provides for fixed revenue commitments regardless of actual volumes of natural gas that flow, which leads to more stable operating performance, revenues and cash flows and limits our exposure to natural gas price fluctuations. We may be unable to renew or replace these contracts at expiration, and our efforts to negotiate for similar fixed revenue commitments may be unsuccessful, which could cause our exposure to natural gas price risk to change or adversely affect the stability of our cash flows.

If third-party pipelines and other facilities interconnected to our assets become unavailable to transport natural gas, it could materially adversely affect our business, financial condition and results of operations.

We depend upon third-party pipelines and other facilities that provide receipt and delivery options to and from our assets. For example, our pipelines interconnect with multiple interstate pipelines in the Midwestern U.S., Canada, Northeastern U.S.

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and Gulf Coast regions and a significant number of intrastate pipelines. Because we do not own these third-party pipelines or facilities, their continuing operation is not within our control. If these pipeline connections become unavailable for current or future volumes of natural gas due to testing, turnarounds, repairs, maintenance, damage, reduced operating pressure, lack of capacity, regulatory requirements or any other reason, our ability to operate efficiently and continue shipping natural gas to end markets could be restricted, thereby reducing our revenues. Any temporary or permanent interruption at any key pipeline interconnect or other downstream facility utilized to move our customers’ product to their end destination that causes a material reduction in volumes transported on our pipelines could materially adversely affect our business, financial condition and results of operations.

In addition, the rates charged by treating plants, pipelines and other facilities interconnected to our assets affect the utilization and value of our services. Significant changes in the rates charged by these third parties, or the rates charged by the third parties that own "downstream" assets required to move commodities to their final destinations, could materially adversely affect our business, financial condition and results of operations.

Our operations are subject to operational hazards, unforeseen interruptions and damage caused by third parties and natural events. If a significant accident or event occurs that results in a business interruption or damage to our pipelines, storage and gathering systems, the facilities of our customers or other interconnected pipelines and facilities, it could materially adversely affect our business, financial condition and results of operations.

Our operations, our customers’ operations and other interconnected pipelines and facilities are subject to many operational hazards, including (i) damage to pipelines, facilities, equipment, environmental controls and surrounding properties, including damage resulting from landslide and ground movement slippage; (ii) leaks, migrations or losses of natural gas and other hydrocarbons, water, brine, other fluids and hazardous chemicals that we handle in our treating and other operations; (iii) inadvertent damage from third parties, including from construction, farm and utility equipment; (iv) uncontrolled releases of natural gas and other hydrocarbons; (v) ruptures, fires and explosions; (vi) product and waste spills and unauthorized discharges of products, wastes and other pollutants; (vii) pipeline freeze-offs due to cold weather; (viii) operator error; (ix) aging infrastructure, mechanical or other performance problems; (x) damages to and loss of availability of interconnecting third-party pipelines, railroads and terminals; (xi) disruption or failure of information technology systems and network infrastructure; (xii) floods; (xiii) severe weather; (xiv) lightning and (xv) terrorism.

These risks could result in loss of human life, personal injuries, significant property damage, environmental pollution, impairment of our operations, regulatory investigations and penalties and substantial financial losses. The location of certain segments of our systems in or near populated areas, including residential areas, commercial business centers and industrial sites, could increase the damages resulting from these risks. In spite of any precautions taken, the occurrence of an event such as those described above that is not fully covered by insurance could materially adversely affect our business, financial condition and results of operations. In addition, these risks could materially impact or completely prevent our customers’ from performing their respective obligations under our commercial agreements, which, in turn, could materially adversely affect our business, financial condition and results of operations.

Failure to successfully combine our business with the assets acquired in the Midwest Pipeline Acquisition, or an inaccurate estimate by us of the benefits to be realized from the Midwest Pipeline Acquisition, may adversely affect our future results.

On December 31, 2024, we closed our transaction with ONEOK pursuant to which DT Midstream acquired 100% of the equity interests of Guardian, Midwestern and Viking. The Midwest Pipeline Acquisition involves potential risks, including:

•failure to attract and retain skilled professional and technical employees could adversely affect operations;

•the failure to realize expected profitability, growth or accretion;

•environmental or regulatory compliance matters or liabilities;

•title or permit issues;

•uncertainty associated with future rate-making proceedings with FERC;

•the diversion of management’s attention;

•the incurrence of substantial maintenance capital or other expenses;

•the incurrence of significant charges, such as impairment of goodwill or other intangible assets, asset devaluation or restructuring charges; and

•the incurrence of unanticipated liabilities and costs for which indemnification is unavailable or inadequate.

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The expected benefits from the Midwest Pipeline Acquisition may not be realized if our estimates of the potential revenues associated with the interests acquired by us in the Midwest Pipeline Acquisition are materially inaccurate or if we failed to identify operating problems or liabilities associated with the underlying pipeline systems prior to closing. The accuracy of our estimates of the potential cash flows generated by the acquired assets is inherently uncertain. Although we conducted due diligence in connection with the Midwest Pipeline Acquisition, DT Midstream cannot assure investors that this diligence surfaced all material issues that may arise as a result of the Midwest Pipeline Acquisition. Additionally, unexpected risks may arise, and previously known risks may materialize in a manner not consistent with our preliminary risk analysis. If problems are identified in the future, the purchase agreement for the Midwest Pipeline Acquisition provides for limited recourse against the seller. If any of these risks or unanticipated liabilities or costs were to materialize, any desired benefits of the Midwest Pipeline Acquisition may not be fully realized, if at all, and our future financial performance, results of operations and cash available for distribution could be negatively impacted.

Expansion projects or acquisitions that are expected to be accretive, including our Midwest Pipeline Acquisition, may nevertheless reduce our cash from operations and could materially adversely affect our business, financial condition and results of operations.

We regularly review our portfolio of businesses and pursue growth through expansions and acquisitions that we expect to be accretive, and we believe the Midwest Pipeline Acquisition will be accretive to our distributive cash flow, improve our business profile, and add to the backlog of future growth opportunities. However, even if we complete expansion projects or acquisitions that we believe will be accretive, these expansion projects or acquisitions may nevertheless reduce our cash from operations and could materially adversely affect our business, financial condition and results of operations. Any expansion project or acquisition involves potential risks, including, among other things: (i) service interruptions or increased downtime associated with our projects; (ii) a decrease in our liquidity; (iii) an inability to complete expansion projects or acquisitions on schedule or within the budgeted cost; (iv) the assumption of unknown liabilities when making acquisitions for which we are not indemnified or for which our indemnity is inadequate; (v) the diversion of our management’s attention from other business concerns; (vi) mistaken assumptions about the overall costs of equity or debt, demand for our services, supply volumes, reserves, revenues and costs, synergies and potential growth; (vii) an inability to secure adequate customer commitments to use the expanded or acquired systems or facilities; (viii) an inability to successfully integrate the businesses we build or acquire; (ix) an inability to receive cash flows from a newly built asset until it is operational; and (x) unforeseen difficulties operating in new service areas or new geographic areas.

We have entered into joint ventures, and may in the future enter into additional or modify existing joint ventures, which might restrict our operational and corporate flexibility. In addition, these joint ventures are subject to most of the same operational risks to which we are subject.

We conduct a meaningful portion of our operations through joint ventures with third parties, including through our interests in Vector, Millennium and NEXUS, and we may enter into additional joint venture arrangements in the future. Generally, we do not operate the assets owned by these joint ventures and our control over their operations is limited by the applicable governing provisions of such joint venture agreements. In certain cases, we could have limited ability to influence or control certain day-to-day activities affecting the operations, the amount of capital expenditures that we may be required to fund with respect to these operations and the amount of cash we will receive from the joint venture. We also could be dependent on our joint venture partners to fund their required share of capital expenditures and be exposed to third party credit risk through our contractual arrangements with our joint venture partners. Additionally, we may be subject to restrictions or limitations on our ability to sell or transfer our interests in the jointly owned assets, and we may be required to offer business opportunities to the joint venture, or rights of participation to other joint venture partners or participants in certain areas of mutual interest.

In addition, our joint venture arrangements may involve risks not otherwise present when operating assets directly. We may incur liabilities as a result of an action taken by our joint venture partners and may be required to devote significant management time to the requirements of and matters relating to the joint ventures. Our joint venture partners may be in a position to take actions contrary to our instructions or requests, or contrary to our policies or objectives. Any disputes between us and our joint venture partners may result in delays, litigation or operational impasses.

The risks described above or the failure to continue our joint ventures or to resolve disagreements with our joint venture partners could adversely affect our ability to conduct business that is the subject of a joint venture, which could in turn materially adversely affect our business, financial condition and results of operations. In addition, these joint ventures are subject to most of the same operational risks to which we are subject and the impact of any of these operational risks on our joint ventures’ respective business, financial condition or results of operations could in turn materially adversely affect our business, financial condition and results of operations.

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We do not own the majority of the land on which our assets are located, which could disrupt our current and future operations.

We do not own the majority of the land on which our assets are located, and we are therefore subject to the possibility of more onerous terms and increased costs or delays to retain necessary land use rights required to conduct our operations if we do not have valid rights-of-way, if such rights-of-way lapse or terminate or if our facilities are not properly located within the boundaries of such rights-of-way. If we were to be unsuccessful in negotiating or renegotiating rights-of-way, we might have to institute condemnation proceedings on our FERC-regulated assets or relocate our facilities for non-regulated assets. Restrictions on our ability to use our rights-of-way, through our inability to renew right-of-way contracts or otherwise, or a relocation could materially adversely affect our business, financial condition and results of operations. Additionally, even when we own an interest in the land on which our assets are located, agreements with correlative rights owners may require us to relocate pipelines and facilities, shut in storage facilities to facilitate the development of the correlative rights owners’ estate or pay the correlative rights owners the lost value of their estate if they are not willing to accommodate development.

We face and will continue to face opposition to the development or operation of our assets from various groups.

We face and will continue to face opposition to the development or operation of our assets from environmental groups, landowners, local and national groups, activists and other advocates. Such opposition could take many forms, including organized protests, attempts to block, vandalize or sabotage our development or operations, intervention in regulatory or administrative proceedings involving our assets directly or indirectly, lawsuits, legislation or other actions designed to prevent, disrupt or delay the development or operation of our assets and business. Any such event that delays or interrupts the revenues generated, or expected to be generated, by our operations, or which causes us to make significant expenditures not covered by insurance, could materially adversely affect our business, financial condition and results of operations.

The expansion of our existing assets and construction of new assets is subject to economic, market, regulatory, environmental, political, and legal risks, which could materially adversely affect our business, financial condition and results of operations. If we are unable to complete expansion projects, our future growth may be limited.

We may be unable to complete successful, accretive expansion projects for many reasons, including economic and market risks such as an inability to identify attractive expansion projects; an inability to successfully integrate the infrastructure we build; an inability to raise financing for expansion projects on economically acceptable terms; and because some of our competitors may be better positioned to compete for certain expansion projects that we believe would be accretive. In addition, the construction of additions or modifications to our existing energy infrastructure assets, and the construction of other new energy infrastructure assets, involve numerous regulatory, environmental, political and legal uncertainties beyond our control. The development and construction of pipeline and gathering infrastructure and storage facilities expose us to construction risks such as: (i) the failure of third parties to meet their contractual requirements; (ii) environmental hazards; (iii) adverse weather conditions; (iv) the performance of third-party contractors; and (v) the lack of available skilled labor, equipment and materials.

Certain of our internal growth projects may require regulatory approval from U.S. federal and state authorities and Canadian authorities prior to construction. The approval process for storage and transportation projects located in the Northeast has become increasingly challenging, due in part to state and local concerns related to unregulated exploration and production and gathering activities in new production areas, including the Marcellus/Utica formations. In addition, FERC could modify its policy governing the issuance of interstate natural gas pipeline authorizations, in part to address concerns about climate change. It is not clear at this time whether FERC will modify its policy governing the issuance of certificates and, if so, what those modifications will be. Policy and regulatory changes relating to the implementation of NEPA may increase scrutiny of environmental impacts associated with our projects. Authorizations required for our projects under existing or future agency policies may not be granted or, if granted, such authorization may include burdensome or expensive conditions.

Failure to retain and attract key executives and other skilled professional and technical employees could materially adversely affect our business, financial condition and results of operations.

Our business is dependent on our ability to attract, retain and motivate employees. We rely on our management team, which has significant experience in the midstream industry, to manage our day-to-day affairs and establish and execute our strategic and operational plans. The loss of any of our key executives or the failure to fill new positions created by expansion, turnover or retirement could adversely affect our ability to implement our business strategy. In addition, our operations require engineers, operational and field technicians and other highly skilled employees. The competition for talent has become increasingly intense, and we may experience increased employee turnover, increased wage inflation or an impediment of our ability to execute certain key strategic initiatives due to a tightening labor market and skilled labor shortages. Failure to

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successfully attract and retain an appropriately qualified workforce could materially adversely affect our business, financial condition and results of operations.

The lack of diversification of our assets and geographic locations could materially adversely affect our business, financial condition and results of operations.

We rely primarily on revenues generated from our pipeline, storage and gathering systems, substantially all of which are located in the Midwestern U.S., Eastern Canada, Northeastern U.S. and Gulf Coast regions. Due to our lack of diversification in assets and geographic location, an adverse development in these businesses or our areas of operations, including adverse developments due to catastrophic events, weather, regulatory action, state and local political activities, availability of equipment and personnel, local prices, producer liquidity and decreases in demand for natural gas could have a more significant impact on our business, financial condition and results of operations than if we maintained more diverse assets and locations.

Liquidity, Credit and Financial Risks

We may not have access to additional financing sources on favorable terms, or at all, which could materially adversely affect our business, financial condition and results of operations, and independent third parties determine our credit ratings outside of our control.

The cost of capital for our business depends, in part, on our credit ratings; general market conditions; the market’s perception of our business risk and growth potential; our current debt levels; interest rate changes; our current and expected future earnings; our cash flow; and the market price per share of our common stock. In part based on our current credit ratings, potential lenders may be unwilling or unable to provide us with financing that is attractive to us, may increase collateral requirements or may charge us prohibitively high fees in order to obtain financing. Consequently, our ability to access the credit markets in order to attract financing on reasonable terms may be adversely affected. Depending on market conditions at the relevant time, we may have to rely more heavily on additional equity financings or on less efficient forms of debt financing that require a larger portion of our cash flow from operations, thereby reducing funds available for our operations, future business opportunities and other purposes. We may not have access to such equity or debt capital on favorable terms, at the desired times, or at all. In addition, declines in our credit ratings may influence our suppliers’ and customers’ willingness to transact with us, increase the cost of our debt capital, and we may be required to make prepayments or provide security to satisfy credit concerns.

Fluctuations in energy prices could materially adversely affect our business, financial condition and results of operations.

Fluctuations in energy prices can greatly affect the development of new natural gas reserves. Drilling and production activity generally decreases as commodity prices decrease. In general terms, the prices of natural gas, oil and other hydrocarbon products fluctuate in response to changes in supply and demand, market uncertainty and a variety of additional factors that are beyond our control. These factors include (i) worldwide political and economic conditions; (ii) weather conditions and seasonal trends; (iii) the levels of domestic production and consumer demand; (iv) the availability of imported and exported natural gas, LNG and other commodities; (v) the ability to export LNG; (vi) the availability of transportation systems with adequate capacity; (vii) the volatility and uncertainty of regional pricing differentials and premiums; (viii) the price and availability of alternative fuels; (ix) the effect of energy conservation measures; and (x) governmental regulation and taxation.

Prices of natural gas have been historically volatile, and we expect this volatility to continue. Consequently, even if new natural gas reserves are discovered in areas served by our assets, producers may choose not to develop those reserves. Sustained declines in natural gas prices could have a negative impact on exploration, development and production activity and could lead to a material decrease in such activity, which could result in reduced throughput on our systems and materially adversely affect our business, financial condition and results of operations. See also "Operational Risks—Any significant decrease in production or in demand of natural gas in our asset footprint could materially adversely affect our business, financial condition and results of operations."

We are exposed to our customers’ credit risk and our credit risk management and contractual terms may be inadequate to protect against such risk.

We are subject to the risk of loss resulting from nonpayment or nonperformance by our customers in the ordinary course of our business. While some of our customers are rated investment grade, others have sub-investment grade ratings. These customers are otherwise considered creditworthy or are required to make prepayments or provide security to satisfy credit concerns. However, our credit procedures and policies may not be adequate to fully eliminate customer credit risk. If we fail to adequately assess the creditworthiness of existing or future customers, the unanticipated deterioration in their creditworthiness

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and any resulting increase in nonpayment or nonperformance by them could materially adversely affect our business, financial condition and results of operations.

Our existing and future level of debt may limit our flexibility to obtain additional financing and to pursue other business opportunities.

As of December 31, 2024, we had outstanding approximately $2.1 billion of senior notes, $1.25 billion of senior secured notes and $150 million of borrowings under our Revolving Credit Facility. Our existing and future level of debt could have important consequences to us, including the following: (i) our ability to obtain additional financing, if necessary, for working capital, capital expenditures, acquisitions or other purposes may be impaired, or such financing may not be available on favorable terms; (ii) the funds that we have available for operations and payment of dividends to shareholders will be reduced by that portion of our cash flow required to make principal and interest payments on outstanding debt; and (iii) our debt level could make us more vulnerable to competitive pressures than competitors with less debt or to a downturn in our business or the economy generally.

Our ability to service our debt will depend upon, among other things, our future financial and operating performance, which will be affected by prevailing economic conditions and financial, business, regulatory and other factors, some of which are beyond our control. In addition, our ability to service debt under our Revolving Credit Facility and other debt facilities with floating rate terms will depend on market interest rates, since we anticipate that the interest rates applicable to our borrowings will fluctuate with movements in interest rate markets. If our operating results are not sufficient to service our current or future indebtedness, we will be forced to take actions such as reducing dividends, reducing or delaying our business activities, acquisitions, investments or capital expenditures, selling assets, restructuring or refinancing our debt, or seeking additional equity capital. We may not be able to effect any of these actions on satisfactory terms, or at all.

Increases in interest rates could increase our interest expense and may adversely affect our cash flows, our ability to service our indebtedness and our ability to pay dividends to our shareholders.

Borrowings under our Revolving Credit Facility have, and we may in the future enter into debt instruments with, variable interest rates. From early 2022 through late 2023, in response to growing signs of inflation, the Federal Reserve increased interest rates rapidly. Although the Federal Reserve reduced the federal funds rate in late 2024, we are unable to predict changes in interest rates which are affected by factors beyond our control. Increases in interest rates on variable rate debt would increase our interest expense unless we make arrangements to hedge the risk of rising interest rates. In addition, interest rates under our Revolving Credit Facility will, and interest rates under future debt instruments we enter into may, increase depending on our leverage ratio levels or, under certain circumstances, our public debt ratings. These increased costs could reduce our profitability, reduce our credit availability, limit our ability to pursue growth opportunities, impair our ability to meet our debt obligations, increase the cost of financing, place us at a competitive disadvantage and materially adversely affect our business, financial condition, cash flows and results of operations. An increase in interest rates also could limit our ability to refinance existing debt upon maturity or cause us to pay higher rates upon refinancing.

Restrictions under our existing or any future credit facilities, indentures and senior notes could adversely affect our business, financial condition, results of operations and ability to pay dividends to our shareholders.

Our existing Revolving Credit Facility and the indenture governing our senior notes limit our ability to, and any future credit facility or indenture we may enter into might limit our ability to, among other things: (i) incur additional indebtedness or guarantee other indebtedness; (ii) grant liens or make certain negative pledges; (iii) make certain dividends or investments; (iv) engage in transactions with affiliates; (v) transfer, sell or otherwise dispose of all or substantially all of our assets; or (vi) enter into a merger, consolidate, liquidate, wind up or dissolve.

Furthermore, our existing Revolving Credit Facility contains, or any future credit facility or indenture we may enter into may also contain, covenants requiring us to maintain certain financial ratios and tests. If we violate any of the restrictions, covenants, ratios or tests in the applicable credit facility or indentures, the lenders thereunder will be able to accelerate the maturity of all borrowings under the credit facility and demand repayment of amounts outstanding, and our lenders’ commitment to make further loans to us may terminate. We might not have, or be able to obtain, sufficient funds to make these accelerated payments. Additionally, we have recently entered into amendments to our Revolving Credit Facility that, among other things, permitted us to incur certain customary bridge loans, extended the maturity date and implemented customary "limited condition transactions provisions", enabling us to enter into future acquisitions and other transactions with the conditionality to the consummation thereof subject only to customary "SunGard" conditions, which provide additional financing certainty and reduce the number of conditions required. Any subsequent amendment to the terms of our Revolving Credit Facility, replacement of our Revolving Credit Facility or any new indebtedness could have similar or greater restrictions.

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For more information, see the section entitled "Management’s Discussion and Analysis of Financial Condition and Results of Operations—Capital Resources and Liquidity".

Inflation and cost increases may impact our sales margins and profitability.

Inflationary pressure could adversely impact our profitability. Inflation in the United States has recently declined; however, we are unable to predict changes in inflation which is affected by factors beyond our control, including the recent imposition of tariffs by the U.S. and certain of its trading partners. Rising inflation in the future could have an adverse impact on our operating costs, which have historically increased with the market during inflationary periods and may continue to increase as a result of inflationary impacts on product costs, labor rates, and domestic transportation. We may not be able to fully offset these inflation increases by raising prices for our services, which could result in downward pressure on our results of operations.

If our intangible assets or goodwill become impaired, we may be required to record a charge to earnings.

We annually review the carrying value of goodwill associated with business combinations we have made for impairment. Our intangible assets and goodwill are also reviewed whenever events or circumstances indicate that the carrying value of these assets may not be recoverable. Factors that may be considered for purposes of this analysis include a decline in stock price and market capitalization, slower industry growth rates, changes in cost of capital or material changes with customers or contracts that could negatively impact future cash flows. We cannot predict the timing, strength or duration of such changes or any subsequent recovery. If the carrying value of any of our intangible assets or goodwill is determined to be not recoverable, we may take a non-cash impairment charge, which could materially adversely affect our business, financial condition and results of operations.

Regulatory Risks

The adoption of legislation and introduction of regulations relating to hydraulic fracturing and the enactment of new or increased severance taxes and impact fees on natural gas production could cause our current and potential customers to reduce the number of future wells or curtail production of existing wells. If reductions are significant for those or other reasons, the reductions could materially adversely affect our business, financial condition and results of operations.

The U.S. Congress has from time to time considered the adoption of legislation to provide for U.S. federal regulation of hydraulic fracturing, while a growing number of states, including some of those in which we operate, have adopted, and other states are considering adopting, regulations that could impose more stringent disclosure and/or well construction requirements on hydraulic fracturing operations. Some states, such as Pennsylvania, have imposed fees on the drilling of new unconventional oil and gas wells. Also, certain local governments have adopted, and additional local governments may further adopt, ordinances within their jurisdictions regulating the time, place and manner of drilling activities in general or hydraulic fracturing activities in particular. Further, several U.S. federal governmental agencies, including the EPA and the U.S. Department of Energy, have conducted or are conducting reviews and studies on the environmental aspects of hydraulic fracturing. These completed, ongoing or proposed studies on the environmental aspects of hydraulic fracturing, depending on their degree of pursuit and any meaningful results obtained, could spur initiatives to further regulate hydraulic fracturing or other regulatory mechanisms.

Certain state and U.S. federal regulatory agencies are also focused on a possible connection between hydraulic fracturing-related activities and the increased occurrence of seismic activity. In a few instances, operators of injection disposal wells in the vicinity of seismic events have been ordered to reduce injection volumes or suspend operations. These developments could result in additional regulation and restrictions on the use of injection disposal wells and hydraulic fracturing. The adoption of new laws, regulations or ordinances at the U.S. federal, state or local levels imposing more stringent restrictions on hydraulic fracturing could make it more difficult for our customers to complete natural gas wells, increase customers’ costs of compliance and doing business, and otherwise adversely affect the hydraulic fracturing services they perform, which could negatively impact demand for our services.

Risks related to climate change could materially adversely affect our business, financial condition, results of operations, cash flow, access to and cost of capital or insurance, reputation, and business strategies.

Our business is subject to physical risks and transition risks related to climate change. Physical risks may arise from more frequent or severe weather events such as floods, landslides, storms, rising water levels, and changes in established weather patterns that cause damage to our assets or to portions of the country’s natural gas infrastructure upon which we or our customers rely. Physical risks from climate change may reduce our ability to operate reliably, safely, and economically and may cause significant insured or uninsured losses that affect our cash flows. In addition to physical risks, our business is subject to

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transition risks arising from efforts to address climate change through legislation and policies and through market preferences that disfavor fossil fuels and related businesses. State and federal governments, as well as foreign governments and international governing bodies such as the United Nations, continue to develop laws, policies, and goals to reduce carbon emissions, foster a lower-carbon economy, and transition away from fossil fuels. While these efforts are diverse and subject to change, they may impose additional compliance costs and may reduce market interest in our business. Changing customer behaviors may lead to less demand for our services, less favorable pricing for our services, inefficient utilization of our assets, and diminished reputation. Our ability to comply with laws and avoid or mitigate physical and transition risks related to climate change may be limited, insufficient, or dependent on technological developments (such as lower-emission equipment) that we do not control or that require substantial additional investments and increase our cost of doing business. If we are unable to implement business strategies that address the physical risks of climate change and that meet the changing expectations of regulators or investors concerning climate change, we may experience a material adverse effect on our business.

Our operations are subject to environmental laws and regulations that may expose us to significant costs and liabilities, and changes in these laws and regulations could materially adversely affect our business, financial condition and results of operations.

Our natural gas transmission, storage and gathering activities are subject to stringent and complex U.S. federal, state and local environmental laws and regulations relating to air quality, water quality, waste management, wildlife conservation, natural resources and worker health and safety. As with the industry generally, compliance with current and anticipated environmental laws and regulations increases our overall cost of conducting business, including our capital costs to construct, maintain and upgrade pipelines and other facilities, or may even cause us not to pursue a project. For instance, we may be required to obtain and maintain permits and other approvals issued by various U.S. federal, state and local governmental authorities; monitor for, limit or prevent releases of materials from our operations in accordance with these permits and approvals; install pollution control equipment or replace aging pipelines and other facilities; limit or prohibit construction activities in sensitive areas such as wetlands, wilderness or areas that provide habitat for endangered or threatened species; incur potentially substantial new obligations or liabilities for any pollution or contamination that may result from our operations; and apply health and safety criteria addressing worker protections. Failure to comply with environmental laws and regulations, or the permits issued under them, may result in the assessment of administrative, civil and criminal penalties, the imposition of investigatory, remedial or corrective action obligations or the incurrence of capital expenditures, the occurrence of delays in the permitting or performance or expansion of projects, the issuance of injunctions limiting or preventing some or all of our operations in a particular area, and private party claims for personal injuries or property damage.

Moreover, environmental laws, regulations and enforcement policies tend to become more stringent over time. New, modified or stricter environmental laws, regulations or enforcement policies, including climate change laws and regulations restricting emissions of GHGs, could be implemented that significantly increase our compliance costs, pollution mitigation costs, or the cost of any necessary remediation of environmental contamination. For example, in April 2020 the U.S. District Court for the District of Montana issued a broad order vacating NWP 12, a general permit issued by the U.S. Army Corps of Engineers relied upon by industry for expedited permitting of oil and gas pipelines, for alleged failure to comply with consultation requirements under the ESA. While the U.S. Supreme Court ultimately stayed the vacatur of NWP 12, the District Court’s action temporarily caused uncertainty and disruption in the industry. A challenge to the 2021 reissuance of NWP 12 (re-issued on a five-year schedule) is pending in the federal district court in Washington, D.C. after the case was transferred from federal court in Montana. The NWP 12 reissuance was among the agency actions listed for review in accordance with the January 20, 2021 Executive Order ("Protecting Public Health and the Environment and Restoring Science to Tackle the Climate Crisis"); and, in 2022 the U.S. Army Corps of Engineers sought public comment on the potential to revise NWP 12 in response to objections to the use of NWP 12 related, primarily, to environmental justice, public participation, and climate change. The prior presidential administration did not take final action to modify the current version of NWP 12 before its expiration and reissuance in March 2026. While a new version might be proposed in early 2025, the position of the new presidential administration is not yet clear. Any disruption in our ability to obtain coverage under NWP 12 or other general permits may result in increased costs and project delays if we are forced to seek individual permits from the U.S. Army Corps of Engineers. Our compliance with changing legal requirements could result in our incurring significant additional expenses and operating restrictions with respect to our operations, which may not be fully recoverable from customers and, thus, could materially adversely affect our business, financial condition and results of operations.

Our customers may similarly incur increased costs or restrictions that may limit or decrease those customers’ operations and have an indirect material adverse effect on our business, financial condition and results of operations. For example, an Executive Order was issued on January 27, 2021 ("Tackling the Climate Crisis at Home and Abroad") that included provisions directing the Secretary of the Interior to pause approval of new oil and natural gas leases on public lands pending completion of a comprehensive review and reconsideration of U.S. federal oil and gas permitting and leasing practices and directing the heads

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of U.S. federal agencies to take steps to ensure that, to the extent consistent with applicable law, federal funding is not directly subsidizing fossil fuels. During the course of the prior presidential administration, litigation over the “pause” ensued. While lease sales ultimately continued, they have been scaled back and are subject to challenge by environmental groups. Over the past four years, the Department of the Interior has issued various regulations, with portions implementing the provisions of the Inflation Reduction Act pertaining to oil and gas leasing. These regulations include the so-called Waste Prevention Rule, which would strictly limit releases of methane from oil and gas drilling on public lands. This could lead to increased costs for producers and increased need for pipeline capacity as operators would be required to have a plan to reduce venting and flaring as a predicate to approval of production of federal minerals. The new presidential administration may return to a robust oil and gas leasing program and re-visit the Waste Prevention Rule as well as a number of other rules that may impact our customers. While the prior presidential administration had placed a temporary pause on the authorization of new LNG terminals, impacting LNG projects in various stages of planning and review, the new presidential administration has lifted this pause and the Department of Energy has been directed to review LNG export applications as expeditiously as possible. Moreover, a number of state and regional legal initiatives, including climate change laws, have emerged in recent years that seek to reduce GHGs emissions and the EPA, based on its findings that emissions of GHGs present a danger to public health and the environment, has adopted regulations under existing provisions of the U.S. federal Clean Air Act that, among other things, restrict emissions of GHGs and require the monitoring and reporting of GHG emissions from specified onshore and offshore production sources and onshore treating sources in the U.S. on an annual basis. In addition, some communities and cities have banned new natural gas hook-ups or are expected to enact similar electrification measures in response to climate change concerns. Any new U.S. federal laws restricting emissions of GHGs, such as a carbon tax, from customer operations, or that limit the growth of pipelines and LNG exports from the U.S., could delay or curtail their activities and, in turn, adversely affect our business, financial condition and results of operations.

There is inherent risk of the incurrence of environmental costs and liabilities in our business due to our handling of natural gas and hazardous substances, and historical industry operations and waste management and disposal practices. For example, an accidental release from one of our facilities could subject us to substantial liabilities arising from environmental cleanup and restoration costs, claims made by neighboring landowners and other third parties for personal injury and property damage, or governmental claims for natural resource damages or imposing fines or penalties for related violations of environmental laws, permits or regulations. In addition, strict, joint and several liabilities may be imposed under certain environmental laws that govern the investigation and remediation of soil and groundwater contamination, which could cause us to become liable for the contamination caused by others, such as prior operators of our facilities, or for the consequences of our own actions that were in compliance with all applicable laws at the time those actions were taken, such as the historic disposal by us of hazardous substances or wastes at third party sites where contamination is subsequently discovered. Private parties, including the owners of the properties through which our assets pass and facilities where our wastes are taken for reclamation or disposal, may also have the right to pursue legal actions against us to enforce compliance, as well as to seek damages for non-compliance, with environmental laws and regulations or for personal injury or property damage that may result from environmental and other impacts of our operations. We may not be able to recover some or any of these costs through insurance or increased revenues, which could materially adversely affect our business, financial condition and results of operations. For more information, see the section entitled "Items 1. and 2. Business and Properties—Regulatory Environment—Environmental and Occupational Health and Safety Regulations".

Our natural gas transportation and storage operations are subject to extensive regulation by FERC and state regulatory authorities, and changes in FERC or state regulation could materially adversely affect our business, financial condition and results of operations.

Our business operations are subject to extensive regulation by FERC, and state regulatory authorities. Generally, FERC’s authority extends to rates and charges for interstate pipelines and storage facilities as well as intrastate pipelines and storage facilities providing service in interstate commerce; terms and conditions of services and service contracts with customers; certification and construction of new interstate pipelines and storage services and facilities and expansion of such facilities; abandonment of interstate pipelines and storage services and facilities; maintenance of accounts and records; relationships between pipelines and certain affiliates; depreciation and amortization rates and policies; facility replacements and upgrades; and acquisitions and dispositions of interstate pipelines and storage facilities.

While FERC may exercise jurisdiction over the rates and terms of service for certain of the services provided by our intrastate pipelines providing service in interstate commerce, such assets are not subject to FERC’s certification and construction authority. Prior to commencing construction of new or expanded existing interstate pipelines and storage facilities, an interstate pipeline must obtain a certificate from FERC authorizing the construction, either by filing a new certificate application or filing to amend its existing certificate. In reviewing certificate applications or amendments, FERC applies its Certificate Policy Statement, which FERC is considering revising, in part to address the consideration of climate change when

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acting on such applications. A revised Certificate Policy Statement could result in more stringent review of future projects within FERC’s jurisdiction.

FERC regulations also extend to the terms and conditions set forth in agreements for our transportation and storage services executed between interstate transportation and storage service providers and their customers. These service agreements are required to conform, in all material respects, with the forms of service agreements set forth in the interstate company's FERC-approved tariff. Non-conforming agreements must be filed with, and accepted by, FERC. In the event that FERC finds that an agreement is materially non-conforming, in whole or in part, it could reject or require us to seek modification of the agreement, or alternatively require us to modify our tariff so that the non-conforming provisions are generally available to all customers or similarly-situated customers. Birdsboro, Guardian, Midwestern, Millennium, NEXUS, Vector, Viking and the Washington 10 Storage Complex provide interstate services in accordance with their FERC-approved tariffs.

Compliance with these requirements can be time-consuming, costly and burdensome and FERC action in any of these areas could adversely affect our ability to compete for business, construct new facilities, offer new services or recover the full cost of operating our pipelines. This regulatory oversight can result in longer lead times to develop and complete any future project than competitors that are not subject to FERC’s regulations. Furthermore, should FERC or state regulatory authorities find that we have failed to comply with all applicable FERC or state-administered statutes, rules, regulations and orders, or the terms of our tariffs on file with FERC, we could be subject to administrative and criminal remedies and substantial civil penalties and fines. We cannot give any assurance regarding the likely future regulations under which we will operate our assets or the effect such regulation could have on our business, financial condition and results of operations.

Any changes to the policies of FERC or state regulatory authorities regarding the natural gas industry may have an impact on us, including FERC’s approach as it considers policies affecting the establishment and modification of interstate pipeline rates and terms and conditions of service, policies that may affect rights of access to natural gas transmission capacity and policies that govern FERC's authorization of new or expanded pipeline and storage infrastructure. FERC is currently considering modifications to its long-standing Certificate Policy Statement that currently governs its granting of certificate authority for the construction of proposed interstate natural gas infrastructure, whether new or expanded. In addition, future U.S. federal, state or local legislation or regulations under which we will operate our assets could materially adversely affect our business, financial condition and results of operations. Guardian, Midwestern and Viking are subject to rate regulation and accounting requirements of the FERC. The regulated operations of each of these subsidiaries have rates that are (i) established by independent, third-party regulators, (ii) set at levels that will recover our costs when considering the demand and competition for our services and (iii) collectible from our customers. Accordingly, we follow the accounting for regulated operations as defined in ASC 980, Regulated Operations for these pipelines, which results in differences in the application of GAAP between our regulated and non-regulated businesses. Under ASC 980, our regulated operations are required to record regulatory assets and liabilities for certain transactions that would have been treated as revenue or expense in non-regulated businesses. Future regulatory changes could result in changes in the amounts of regulatory assets and liabilities or the discontinuance of this accounting treatment for regulatory assets and liabilities and may require the write-off of the portion of any regulatory asset or liability that is no longer probable of recovery through regulated rates. Actions by regulatory authorities could also have an effect on the amounts we charge to and collect from our customers. Any changes to ASC 980 or on the determination of whether Guardian, Midwestern or Viking will continue to meet the criteria of ASC 980 could materially adversely affect our business, financial condition and results of operations.

We are exposed to costs associated with lost and unaccounted-for volumes.

A certain amount of natural gas is inherently lost and unaccounted-for in connection with meter differences and movement across a pipeline or storage system, and under our contractual arrangements with our customers we are entitled to retain a specified volume of natural gas in order to compensate us for such volumes as well as the natural gas used to operate our compressor stations, which we refer to as "fuel usage." The level of fuel usage and lost and unaccounted-for volumes on our transportation, storage and gathering systems may exceed the natural gas volumes retained from our customers as compensation for such volumes. In addition, our gathering systems have contracts that provide for specified levels of fuel retainage. As such, we need to purchase natural gas in the market to make up for any of these differences, which exposes us to natural gas price risk. Future exposure to the volatility of natural gas prices as a result of gas imbalances on our transportation, storage and gathering systems could materially adversely affect our business, financial condition and results of operations.

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A change in the jurisdictional characterization of our gathering assets may result in increased regulation by FERC, which could cause our revenues to decline and operating expenses to increase and could materially adversely affect our business, financial condition and results of operations.

We believe that our non-jurisdictional natural gas gathering facilities, including those which we refer to as "gathering lateral pipelines," meet the traditional tests FERC has used to establish a pipeline’s status as an exempt gatherer not subject to regulation as a FERC-jurisdictional natural gas company under the NGA, although FERC has not made a formal determination with respect to the jurisdictional status of those facilities. FERC regulation nonetheless affects our businesses and the markets for products derived from our gathering businesses. FERC’s policies and practices across the range of its gas regulatory activities, including, for example, its policies on certification of new interstate natural gas facilities, open access transportation, rate making, terms and conditions of service, capacity release and market center promotion, indirectly affect intrastate markets. We have no assurance that FERC will continue its current policies as it considers matters such as certification of new interstate natural gas facilities, pipeline rates and rules and policies that may affect rights of access to natural gas transportation capacity. In addition, the distinction between FERC-regulated transmission services and federally unregulated gathering services is regularly the subject of substantial litigation in the industry. Consequently, the classification and regulation of some of our gathering operations could change based on future determinations by FERC, the courts or the U.S. Congress. If our gathering operations become subject to FERC jurisdiction, the result may adversely affect the rates we are able to charge and the services we currently provide and may include the potential for a termination of certain gathering agreements, which could materially adversely affect our business, financial condition and results of operations.

State and local legislative and regulatory initiatives relating to gas operations could adversely affect our services and customers’ production and therefore, materially adversely affect our business, financial condition and results of operations.

State and municipal regulations also impact our business. Common purchaser statutes generally require gatherers to gather or provide services without undue discrimination as to source of supply or producer; as a result, these statutes restrict our right to decide whose production we gather or transport. U.S. federal law leaves any economic regulation of natural gas gathering to the states. Some of the states in which we currently operate have adopted complaint-based regulation of gathering activities, which allows gas producers and shippers to file complaints with state regulators in an effort to resolve access and rate grievances. Other state and municipal regulations may not directly regulate our gathering business but may nonetheless affect the availability of natural gas for purchase, treating and sale, including state regulation of production rates and maximum daily production allowable from gas wells. While our gathering lines currently are subject to limited state regulation, there is a risk that state laws will be changed, which may give producers a stronger basis to challenge the rates, terms and conditions of their gathering lines.

Certain states in which we operate have adopted or are considering adopting measures that could impose new or more stringent requirements on gas exploration and production activities. For example, the potential for adverse impacts to our business is present where state or local governments have enacted ordinances directly regulating production rates and maximum daily production allowable from gas wells, and private individuals have sponsored and may in the future sponsor citizen initiatives to limit hydraulic fracturing, increase mandatory setbacks of oil and gas operations from occupied structures and achieve more restrictive state or local control over such activities.

In the event state or local restrictions or prohibitions are adopted in our areas of operations, our customers may incur significant compliance costs or may experience delays or curtailment in the pursuit of their exploration, development or production activities, and possibly be limited or precluded in the drilling of certain wells altogether. Any adverse impact on our customers’ activities would have a corresponding negative impact on our throughput volumes. In addition, while the general focus of debate is on upstream development activities, certain proposals may, if adopted, directly impact our ability to competitively locate, construct, maintain and operate our own assets. Accordingly, such restrictions or prohibitions could materially adversely affect our business, financial condition and results of operations.

Changes in tax laws or regulations may have a material adverse effect on our business, cash flow, financial condition or results of operations.

New income, sales, use or other tax laws, statutes, rules, regulations or ordinances could be enacted at any time, which could adversely affect our business operations and financial performance. Further, existing tax laws, statutes, rules, regulations or ordinances could be interpreted, changed, modified or applied adversely to us. It cannot be predicted whether or when tax laws, statutes, rules, regulations or ordinances may be enacted, issued, or amended. Changes to existing tax laws or the

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enactment of future reform legislation could have a material impact on our financial condition, results of operations and ability to pay dividends to our shareholders.

Some of our operations cross the U.S./Canada border and are subject to cross-border regulation and potential tariffs which may have a material impact on our business, cash flow, financial condition or results of operations.

Our cross-border activities subject us to regulatory matters, including import and export licenses, tariffs, Canadian and U.S. customs and tax issues, and toxic substance certifications. Such regulations include the "Short Supply Controls" of the Export Administration Act, the United States-Mexico-Canada Agreement and the Toxic Substances Control Act. Violations of these licensing, tariff and tax-reporting requirements could result in the imposition of significant administrative, civil and criminal penalties, which could, in turn, materially adversely affect our business, financial condition and results of operations.

For example, tariffs or other restrictions placed on the import and export of natural gas with Canada and any related counter-measures that are taken by Canada could have an adverse effect on our financial condition or results of operations. Even in the absence of further tariffs, the related uncertainty could have a material adverse effect on our business, liquidity, financial condition or results of operations.

Pipeline Safety and Maintenance Risks

We may incur significant costs and liabilities to maintain our pipeline integrity management program and related testing, pipeline repair, and preventative or remedial measures, as well as other operational and maintenance requirements and assessments.

The U.S. Department of Transportation, through PHMSA, has adopted regulations requiring pipeline operators to comply with a number of operational and maintenance requirements, including to continuously survey their assets, conduct leakage surveys, and repair certain conditions. Additionally, these requirements require operators to develop integrity management programs for transportation pipelines located where a leak or rupture could do the most harm in a high consequence area, referred to as an HCA. The regulations require operators to: (i) perform ongoing assessments of pipeline integrity; (ii) identify and characterize applicable threats to pipeline segments that could impact an HCA; (iii) improve data collection, integration and analysis; (iv) repair and remediate the pipeline as necessary; and (v) implement preventive and mitigating actions. PHMSA regulations also require assessment and repairs outside of HCAs in what are referred to as moderate consequence areas or MCAs.

Additionally, while states are preempted by U.S. federal law from regulating pipeline safety for interstate lines, most are certified by PHMSA to assume responsibility for enforcing U.S. federal intrastate pipeline regulations and inspection of intrastate pipelines. In practice, states can adopt stricter standards for intrastate pipelines than those imposed by PHMSA for interstate pipelines, and states vary considerably in their authority and capacity to address pipeline safety. Accordingly, midstream operators of pipeline and associated storage facilities may be required to make operational changes or modifications at their facilities to meet standards beyond current federal requirements, where such changes or modifications may result in additional capital costs, possible operational delays and potentially significant increased costs of operations.

Failure to comply with PHMSA or state pipeline safety regulations could result in a number of consequences which may have an adverse effect on our operations. We incur significant costs in complying with existing PHMSA and state pipeline safety regulations, but we do not believe such costs of compliance will materially adversely affect our business, financial condition and results of operations. We may incur significant costs associated with repair, remediation, preventive and mitigation measures associated with our integrity management programs and may be required to comply with new safety regulations and make additional maintenance capital expenditures in the future for similar regulatory compliance initiatives that are not reflected in our forecasted maintenance capital expenditures.

Certain portions of our pipelines, storage and gathering infrastructure are aging, which could materially adversely affect our business, financial condition and results of operations.

Certain portions of our systems, particularly our Northern Michigan assets and our storage assets, have been in operation for many years, with some portions being more than 50 years old. In some cases, certain portions may have been in service for many years prior to our purchase of the relevant systems or have been operated by third parties not under our control and consequently, there may be historical occurrences or latent issues regarding our pipeline systems that management may be unaware of and that could materially adversely affect our business, financial condition and results of operations. Certain portions of our pipeline systems are located in or near areas determined to be HCAs, which are areas where a leak or rupture could have the most significant adverse consequences. The age and condition of these systems could result in increased maintenance or repair expenditures, and any downtime associated with increased maintenance and repair activities could

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materially reduce our revenue. If, due to their age, certain pipeline sections were to become unexpectedly unavailable for current or future volumes of natural gas because of repairs, maintenance, damage, spills or leaks, or any other reason, it could materially adversely affect our business, financial condition and results of operation.

Our insurance policies do not cover all losses, costs or liabilities that we may experience, and there is no assurance that we will be able to purchase cost effective insurance in the future.

We are not fully insured against all risks inherent in our business, including environmental accidents that might occur as well as cyberattacks. In addition, we do not maintain business interruption insurance of the types and in amounts necessary to cover all possible risks of loss, like project delays caused by governmental action or inaction. The occurrence of any operating risk events not fully covered by insurance could materially adversely affect our business, financial condition and results of operations.

As a result of market conditions, premiums and deductibles for certain of our insurance policies may substantially increase. In some instances, certain insurance could become unavailable or available only for reduced coverage amounts. If significant changes in the number or financial solvency of insurance underwriters for the energy industry occur, we may be unable to obtain and maintain adequate insurance at a reasonable cost. The unavailability of full insurance coverage or our inability to maintain or obtain insurance of the type and amount we desire at reasonable rates to cover events in which we suffer significant losses could materially adversely affect our business, financial condition and results of operations.

A terrorist attack or armed conflict event, or the threat of them, could harm our business.

The U.S. Department of Homeland Security (DHS) has continued to issue public warnings that indicated that pipelines and other energy assets might be specific targets of terrorist organizations. Potential targets include our pipelines, storage and gathering systems and may affect our ability to operate or control our assets or utilize our customer service systems. Destructive forms of protests and opposition by extremists, and other disruptions, including acts of sabotage or eco-terrorism, against oil and natural gas development and production or midstream treating or transportation activities could potentially result in damage or injury to persons, property or the environment or lead to extended interruptions of our or our customers’ operations. The threat or occurrence of any of these events could cause a substantial decrease in revenues; increased costs or other financial losses; exposure or loss of customer information; damage to our reputation or business relationships; increased regulation or litigation; disruption of our operations; and inaccurate information reported from our operations.

Other Business Risks

Customers’, legislators’ or regulators’ perceptions of us are affected by many factors, including environmental and safety concerns, pipeline reliability, protection of customer information, media coverage, and public sentiment. Customers’, legislators’ or regulators’ negative opinion of us could materially adversely affect our business, financial condition and results of operations.

Many factors can affect customers’, legislators’ or regulators’ perceptions of us, including: safety concerns due to potential natural disasters, the rupture of pipelines, or other causes and our ability to promptly respond to such issues; our ability to safeguard sensitive customer information; media coverage, including the proliferation of social media, which may include factual and nonfactual information that could damage the public sentiment and perception of our company and the midstream industry.

If customers, legislators or regulators have or develop a negative opinion of us and our services, or of fossil fuels as an energy source generally, this could hinder our ability to achieve favorable legislative or regulatory outcomes. Negative opinions could also result in sales volumes reductions, increased use of alternative forms of energy, reduced access to capital markets, or greater challenges in developing or operating our assets.

In addition, in recent years, attention has been given to corporate activities related to ESG matters in public discourse and the investment community. Investor advocacy groups, proxy advisory firms, certain institutional investors and lenders, investment funds and other influential investors and rating agencies have been focused on climate change, societal expectations on companies to address climate change, investor and societal expectations regarding voluntary ESG disclosures, and consumer demand for alternative forms of energy. Attention to climate change and environmental conservation could result in increased costs, reduced access to insurance at reasonable rates, reduced demand for our services, reduced profits, negative impacts on our stock price, reduced access to capital markets, and governmental investigations and private litigation against us or our customers. To the extent that societal pressures or political or other factors are involved, it is possible that a liability could be imposed without regard to our causation of or contribution to the asserted damage, or to other mitigating factors. While we may

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participate in various voluntary frameworks and certification programs to improve the ESG profile of our operations and products, we cannot guarantee that such participation or certification will have the intended results on our ESG profile.

A number of advocacy groups have campaigned for governmental and private action to promote change at public companies related to ESG matters, including demands for action related to climate change, promoting the use of alternative forms of energy, and encouraging the divestment of companies in the fossil fuel industry. Some organizations that provide corporate governance and related information to investors have ratings systems for evaluating companies on their approach to ESG matters. Unfavorable ESG ratings could lead to negative investor and bank financing sentiment toward us and our industry and to the diversion of investment to other companies or industries, which could adversely affect the demand for our services, our stock price, our access to and costs of capital and, in turn, materially adversely affect our business, financial condition and results of operations.

We published our third annual Corporate Sustainability Report in 2024, which detailed how we seek to manage our operations responsibly and ethically, as well as strategies and goals associated with reducing our environmental impact. The Corporate Sustainability Report included our policies and practices on a variety of social and ethical matters, including, but not limited to, corporate governance, environmental compliance, employee health and safety practices, human capital management and workforce inclusion and diversity. We believe providing more expansive disclosure on these topics in our Corporate Sustainability Report increases our transparency to our stakeholders and complements the disclosures regarding our contributions to sustainable development in this Form 10-K. It is possible that stakeholders may not be satisfied with our ESG practices or the speed of their adoption. We could also incur additional costs and require additional resources to monitor, report and comply with various ESG practices. Also, our failure, or perceived failure, to meet the standards set forth in the Corporate Sustainability Report could negatively impact our reputation, employee retention, and the willingness of our customers and suppliers to do business with us. Any of these consequences could materially adversely affect our business, financial condition and results of operations.

We are subject to cybersecurity and data privacy laws, regulations, litigation and directives relating to our processing of personal data.

Our business involves collection, uses and other processing of personal data of our employees, contractors, suppliers and service providers. Governmental standards and commonly accepted frameworks for the protection of computer-based systems and technology from cyber threats and attacks have been adopted. On November 7, 2024, the DHS's Transportation Security Administration issued a notice of proposed rulemaking seeking to imposes cybersecurity requirements on certain pipeline facilities entitled "Enhancing Surface Cyber Risk Management." New data privacy and cybersecurity laws add additional complexity, requirements, restrictions and potential legal risk, and compliance programs may require additional investment in resources, and could impact strategies and availability of previously useful data. Any failure by us or one of our technology service providers to comply with such laws and regulations could result in reputational harm, penalties, regulatory scrutiny, liabilities, legal claims, and/or mandated changes in our business practices.

We will report any confirmed cybersecurity incidents to the Cybersecurity and Infrastructure Security Agency. As legislation continues to develop and cyber incidents continue to evolve, we may be required to expend significant additional resources to respond to cyberattacks, to continue to modify or enhance our protective measures, or to detect, assess, investigate and remediate any security vulnerabilities and report any cyber incidents to the applicable regulatory authorities. Any failure to maintain compliance with these evolving government regulations may result in enforcement actions which may then result in significant time, support and cost and have a material adverse effect on our business and operations.

A cyberattack or threat could harm our business.

We have become increasingly dependent on digital information technologies, including computer-based systems, infrastructure, and cloud applications, to conduct almost all aspects of our business. These include operating our pipeline, storage and gathering assets, recording commercial transactions, communicating with employees supporting our operations and our customers or other business partners, and reporting financial information. We also collect and store sensitive data in the ordinary course of our business, including personally identifiable information of our employees, as well as our proprietary business information and that of our vendors, customers and other business partners. We depend on both our own systems, networks and technology, as well as the systems, networks and technology of our vendors, customers, and other business partners, including our joint venture partners. The secure processing, maintenance and transmission of this information is critical to our operations.

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Our increasing reliance on digital technologies puts us at risk for system failures, disruptions, incidents, data breaches and cyberattacks, which could significantly impair our ability to conduct our business. Cyberattacks are becoming more sophisticated and include, but are not limited to, ransomware, credential stuffing, spear phishing, social engineering and other attempts to gain unauthorized access to data for purposes of extortion or malfeasance. The methodologies used by attackers change frequently and may not be recognized until such attack is underway. In April 2022, the cybersecurity authorities of the United States, Australia, Canada, New Zealand, and the United Kingdom issued a joint cybersecurity advisory warning of the increased risks of Russian state-sponsored cyberattacks following the international response to Russia’s invasion of Ukraine. We expect to continue to be targeted by cyberattacks as a critical infrastructure company.

We may not be able to anticipate, detect or prevent all cyberattacks, and the threat or occurrence of a cyberattack affecting our information technology systems or the information technology systems of our counterparties, depending on the extent or duration of the event, could materially adversely affect us, including by leading to corruption, misappropriation or loss of our proprietary and sensitive data, delays (which could be significant) in the performance of services for our customers, difficulty in completing and settling transactions, challenges in maintaining our books and records, communication interruptions, environmental damage, regulatory scrutiny, personal injury or death, property damage and other operational disruptions, as well as damage to our reputation, financial condition and cash flows and potential legal claims and liabilities.

Treated gas produced by Clean Fuels Gathering may not qualify for federal income tax credits for clean fuel production as had been projected.

The economic proceeds from Clean Fuels Gathering are expected to come from sales of treated gas, carbon offsets, and federal income tax credits. Clean Fuels Gathering produced gas may not qualify for federal income tax credits. The income tax credit value could be lower and/or uncertain compared to economic expectations. A change in tax law could lower or eliminate Clean Fuels Gathering from qualifying or receiving federal income tax credits, which would impact its projected economic return.

Risks Related to the Separation

We agreed to numerous restrictions to preserve the non-recognition treatment of the Distribution, and we could have an indemnification obligation to DTE Energy in accordance with the terms of the Tax Matters Agreement if the Distribution were determined not to qualify for non-recognition treatment for U.S. federal tax purposes.

We agreed in the Tax Matters Agreement to covenants and indemnification obligations that address compliance with Section 355(e) of the Internal Revenue Code. These covenants and indemnification obligations may limit our ability to pursue strategic transactions or engage in new businesses that may otherwise maximize the value of our Company and might discourage or delay a strategic transaction that our shareholders may consider favorable. Additionally, if it were determined that the Distribution did not qualify as a distribution to which Section 355(a), Section 355(c) and Section 361 of the Internal Revenue Code apply, we could, under certain circumstances, be required to indemnify DTE Energy for the resulting taxes and related expenses.

The Separation may expose us to potential liabilities arising out of state and U.S. federal fraudulent conveyance laws and legal dividend requirements.

If DTE Energy files for bankruptcy or is otherwise determined or deemed to be insolvent under U.S. federal bankruptcy laws, a court could deem the Separation or certain internal restructuring transactions undertaken by DTE Energy in connection with the Separation to be a fraudulent conveyance or transfer. Fraudulent conveyances or transfers are defined to include transfers made or obligations incurred with the actual intent to hinder, delay or defraud current or future creditors, or transfers made or obligations incurred for less than a reasonably equivalent value when the debtor was insolvent, or that rendered the debtor insolvent, inadequately capitalized or unable to pay its debts as they become due. A court could void the transactions or impose substantial liabilities upon us, which could materially adversely affect our business, financial condition and results of operations. Among other things, a court could require our shareholders to return to DTE Energy some or all of the shares of our common stock issued in the Separation or require us to fund liabilities of other companies involved in the restructuring transactions for the benefit of creditors. The distribution of our common stock is also subject to review under state corporate distribution statutes. Although DTE Energy intended to make a lawful distribution of our common stock, we cannot assure you that a court will not later determine that some or all of the Distribution to DTE Energy shareholders was unlawful.

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Item 1B. Unresolved Staff Comments

None.

Item 1C. Cybersecurity

Cybersecurity Risk Management and Strategy

To identify and manage the material risks of cybersecurity threats to our business, operations and control environments, we have made investments in our technology and have implemented policies, programs and controls, with a focus on cybersecurity incident prevention and mitigation. Our cybersecurity program is integrated into our risk management process and is managed by a dedicated cybersecurity team that is responsible for leading enterprise-wide cybersecurity strategy, policy, standards, architecture, and processes. The program is aligned with industry standards and best practices, such as the National Institute of Standards and Technology Cybersecurity Framework. As part of our cybersecurity process, we engage external experts and consultants to assess our cybersecurity program and compliance with applicable practices and standards.

The Company mitigates risks from cybersecurity incidents using a multifaceted approach which includes but is not limited to: establishing information security policies, implementing information protection processes and technologies, assessing cybersecurity risk, implementing cybersecurity training, monitoring our information technology systems, and collaborating with public and private organizations on best practices. The Company is currently in material compliance with relevant information privacy and cybersecurity governmental standards with which it is required to comply.

The Company has not experienced a material cybersecurity incident during the year ended December 31, 2024. For more information on how material cybersecurity incidents may impact our business, see Part I, Item 1A. "Risk Factors—Risks Relating to Our Business—Other Business Risks—A cyberattack or threat could harm our business" of this Form 10-K.

Cybersecurity Governance

Our Director of Cybersecurity has over 20 years of relevant experience and is responsible for managing our cybersecurity program and team, which monitors the day-to-day risks using the approach described above. Material near-term and long-term risks are communicated with senior management and the Board of Directors. The Company's Board of Directors is engaged in overseeing and reviewing the Company’s strategic direction and objectives, taking into account, among other considerations, the Company’s risk profile and exposures. While the Board of Directors retains oversight over policy and strategy related to cybersecurity, it has delegated the responsibility for the oversight of the Company’s cybersecurity program to the Audit Committee. The Audit Committee is responsible for reviewing and discussing the Company’s policies regarding risk assessment and risk management, major accounting risk exposures and the implementation and effectiveness of risk management protocols with respect to information technology security and cybersecurity risks, as well as reviewing material breaches and attacks, as applicable.

Item 3. Legal Proceedings

For information on legal proceedings and matters related to DT Midstream, see Note 12, "Commitments and Contingencies" to the Consolidated Financial Statements under Part II, Item 8 of this Form 10-K.

Item 4. Mine Safety Disclosures

Our sand mining facility in Louisiana is subject to regulation by the Federal Mine Safety and Health Administration under the Federal Mine Safety and Health Act of 1977. Information concerning mine safety violations or other regulatory matters required by section 1503(a) of the Dodd-Frank Wall Street Reform and Consumer Protection Act and Item 104 of Regulation S-K is filed as Exhibit 95.1 to this Annual Report on Form 10-K.

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PART II

Item 5. Market for Registrant’s Common Equity, Related Stockholder Matters, and Issuer Purchases of Equity Securities

DT Midstream's common stock is listed under the ticker symbol "DTM" on the NYSE, which is the principal market for such stock. As of December 31, 2024, there were 101,324,894 shares of DT Midstream common stock issued and outstanding. These shares were held by a total of 37,147 shareholders of record.

We expect to pay regular cash dividends to DT Midstream common stockholders in the future. Any payment of future dividends is subject to approval by the Board of Directors and may depend on our future earnings, cash flows, capital requirements, financial condition, and the effect a dividend payment would have on our compliance with relevant financial covenants. Over the long-term, we expect to grow our dividend with cash flow growth. For information on DT Midstream's historical dividends and dividend restrictions, see Note 8, "Earnings Per Share and Dividends" and Note 10, "Debt" to the Consolidated Financial Statements under Part II, Item 8 of this Form 10-K. There were no sales of unregistered equity securities during the past three years.

Securities Authorized for Issuance Under Equity Compensation Plans

DT Midstream's Long-Term Incentive Plan was approved by shareholders as an equity compensation plan that provides for the annual awarding of stock-based compensation to all employees. See Note 13, "Stock-Based Compensation and Defined Contribution Plans" to the Consolidated Financial Statements under Part II, Item 8 of this Form 10-K.

See the following table for information as of December 31, 2024:

	Number of Securities to be Issued Upon Exercise of Outstanding Options, Warrants, and Rights (a)	Weighted-Average Exercise Price of Outstanding Options, Warrants, and Rights		Number of Securities Remaining Available for Future Issuance Under Equity Compensation Plans
DT Midstream, Inc. Long-Term Incentive Plan	1,163,847	$	—	6,605,030

_____________________________________

(a)Includes 463,033 Restricted Stock Units and 700,814 Performance Share Awards.

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COMPARISON OF CUMULATIVE TOTAL RETURN

Total Return to DT Midstream Investors

The graph below shows the cumulative total shareholder return assuming the investment of $100, including the reinvestment of dividends, on July 1, 2021 in our common stock, the Standard & Poor’s 500 Index, or S&P 500 Index, and the Alerian Midstream Energy Index. We believe the Alerian Midstream Energy Index is meaningful because it is an independent, objective view of the performance of similarly-sized midstream energy companies.

	Base Period	Indexed Returns
Company/Index	July 1, 2021	December 31, 2021	December 31, 2022	December 31, 2023	December 31, 2024
DT Midstream	100.00	117.18	141.56	148.29	280.16
S&P 500 Index	100.00	111.07	90.94	114.82	143.52
Alerian Midstream Energy Index	100.00	97.63	118.56	136.19	196.66

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Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations

This discussion contains forward-looking statements that involve risks and uncertainties. The forward-looking statements are not historical facts, but rather are based on current expectations, estimates, assumptions and projections about the midstream industry and our business and financial results. Our actual results could differ materially from the results contemplated by these forward-looking statements due to a number of factors, including those discussed in the sections entitled "Forward-Looking Statements" and "Risk Factors."

OVERVIEW

Our Business

We are an owner, operator, and developer of an integrated portfolio of natural gas midstream assets. We provide multiple, integrated natural gas services to customers through our Pipeline segment, which includes interstate pipelines, intrastate pipelines, storage systems, and gathering lateral pipelines, and through our Gathering segment. We also own joint venture interests in equity method investees which own and operate interstate pipelines that connect to our wholly owned assets. On December 31, 2024, we closed on the Midwest Pipeline Acquisition of three FERC-regulated natural gas transmission pipelines. See Note 16, "Acquisitions" to the Consolidated Financial Statements under Part II, Item 8 of this Form 10-K.

Our core assets strategically connect key demand centers in the Midwestern U.S., Eastern Canada and Northeastern U.S. regions to the premium production areas of the Marcellus/Utica natural gas formation in the Appalachian Basin and connect key demand centers and LNG export terminals in the Gulf Coast region to premium production areas of the Haynesville natural gas formation.

We have an established history of stable, long-term growth with contractual cash flows from customers that include natural gas producers, local distribution companies, electric power generators, industrials, and national marketers.

Our Strategy

See discussion of our strategy under Part I, Items 1. and 2. "Business and Properties—Our Strategy" of this Form 10-K.

RESULTS OF OPERATIONS

Management’s Discussion and Analysis of Financial Condition and Results of Operations includes financial information prepared in accordance with GAAP. The following sections discuss the operating performance and future outlook of our segments. Segment information includes intercompany revenues and expenses, as well as other income and deductions that are eliminated in the Consolidated Financial Statements.

For purposes of the following discussion, any increases or decreases refer to the comparison of the year ended December 31, 2024 to the year ended December 31, 2023, or the year ended December 31, 2023 to the year ended December 31, 2022, as applicable. The following table summarizes our consolidated financial results:

	Year Ended December 31,
	2024		2023		2022
	(millions, except per share amounts)
Operating revenues	$	981	$	922	$	920
Net Income Attributable to DT Midstream	$	354	$	384	$	370
Diluted Earnings per Common Share	$	3.60	$	3.94	$	3.81

	Year Ended December 31,
	2024		2023		2022
	(millions)
Net Income Attributable to DT Midstream
Pipeline	$	276	$	278	$	228
Gathering	78		106		142
Total	$	354	$	384	$	370

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Pipeline

The Pipeline segment consists of our interstate pipelines, intrastate pipelines, storage systems, gathering lateral pipelines including related treatment plants and compression and surface facilities. This segment also includes our equity method investments. During the three months ended March 31, 2023, we completed the conversion of the Michigan System from gathering to dry gas transmission service and began providing services under a new long-term dry gas transmission contract. For the years ended December 31, 2024 and 2023, the Michigan System financial results are presented in the Pipeline segment. The activity for the year ended December 31, 2022 was for gathering services and therefore was not revised from presentation in the Gathering segment.

Pipeline results and outlook are discussed below:

	Year Ended December 31,
	2024		2023		2022
	(millions)
Operating revenues	$	443	$	377	$	339
Operation and maintenance	68		55		54
Depreciation and amortization	74		69		63
Taxes other than income	22		15		14
Asset (gains) losses and impairments, net	—		(4)		(6)
Operating Income	279		242		214
Interest expense	47		55		57
Interest income	(4)		(1)		(1)
Earnings from equity method investees	(162)		(177)		(150)
Loss from financing activities	3		—		6
Other income	(1)		—		—
Income tax expense	107		75		62
Net Income	289		290		240
Less: Net Income Attributable to Noncontrolling Interests	13		12		12
Net Income Attributable to DT Midstream	$	276	$	278	$	228

Operating revenues increased $66 million for the year ended December 31, 2024 primarily due to new LEAP long-term firm service revenue contracts of $55 million, higher long-term contracting rates and volumes at the Washington 10 Storage Complex of $9 million and higher volumes at Stonewall of $9 million, partially offset by lower volumes at Bluestone of $8 million. Operating revenues increased $38 million for the year ended December 31, 2023 primarily due to higher long-term and short-term storage contracting rates at the Washington 10 Storage Complex of $18 million, new transmission service contracts at the Michigan System of $16 million, and new LEAP long-term firm service revenue contracts of $10 million, partially offset by lower volumes at Bluestone of $2 million.

Operation and maintenance expense increased $13 million for the year ended December 31, 2024 primarily due to higher production-related operating expenses from the expansion of LEAP and acquisition related costs for the Midwest Pipeline Acquisition. Operation and maintenance expense increased $1 million for the year ended December 31, 2023 primarily due to new transmission service contracts at the Michigan System, partially offset by increased capitalized labor and overhead.

Depreciation and amortization expense increased $5 million for the year ended December 31, 2024 primarily due to new LEAP assets placed into service. Depreciation and amortization expense increased $6 million for the year ended December 31, 2023 primarily due to new transmission service assets at the Michigan System and new LEAP assets placed into service.

Taxes other than income increased $7 million for the year ended December 31, 2024 primarily due to LEAP assets placed into service.

Asset (gains) losses and impairments, net decreased $4 million for the year ended December 31, 2024 due to a one-time gain realized from an insurance settlement that occurred in the prior year.

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Interest expense decreased $8 million for the year ended December 31, 2024 primarily due to lower outstanding borrowings under the Revolving Credit Facility and the repayment of the Term Loan Facility during 2024, partially offset by lower capitalized interest driven by lower construction in progress during 2024 and higher interest related to the Bridge Facility and 2034 Notes. Interest expense decreased $2 million for the year ended December 31, 2023 primarily due to higher capitalized interest on higher construction in progress during 2023, partially offset by higher borrowings and rates under the Revolving Credit Facility, higher interest rates on the Term Loan Facility, and a full year of interest expense related to our 2032 Notes.

Earnings from equity method investees decreased $15 million for the year ended December 31, 2024 primarily due to higher interest expense from new senior unsecured notes at Millennium and a full year of interest expense from senior unsecured notes at NEXUS. Earnings from equity method investees increased $27 million for the year ended December 31, 2023 primarily due to higher earnings from Millennium of $19 million from our higher ownership percentage and a goodwill impairment at Generation of $7 million in 2022. Additionally, NEXUS had increased contract rates and additional customers offset by higher interest expense from new senior unsecured notes. On October 7, 2022, DT Midstream closed on the $552 million purchase of an additional 26.25% ownership interest in Millennium from National Grid. See Note 1, "Description of the Business and Basis of Presentation" to the Consolidated Financial Statements under Part II, Item 8 of this Form 10-K.

Loss from financing activities increased $3 million for the year ended December 31, 2024 primarily due to the repayment of our remaining Term Loan Facility that occurred during the current year. Loss from financing activities decreased $6 million for the year ended December 31, 2023 due to the partial repayment of our Term Loan Facility that occurred during the three months ended June 30, 2022. See Note 10, "Debt" to the Consolidated Financial Statements under Part II, Item 8 of this Form 10-K for further details.

Income tax expense increased $32 million for the year ended December 31, 2024 primarily due to higher income before income taxes and deferred tax remeasurement adjustments for changes in state tax rates and apportionment factors due to the Midwest Pipeline Acquisition and enacted state legislation. Income tax expense increased $13 million for the year ended December 31, 2023 due to higher income before income taxes in 2023. Income tax expense for the years ended December 31, 2023 and 2022 include the impacts of net tax benefits related to state tax rate changes. See Note 7, "Income Taxes" to the Consolidated Financial Statements under Part II, Item 8 of this Form 10-K for further details.

Pipeline Outlook

We believe our long-term agreements with customers and the location and connectivity of our pipeline assets position the business for future growth. We will continue to pursue economically attractive expansion opportunities that leverage our current asset footprint and strategic relationships. These growth opportunities include DTM Interstate Transportation assets, further expansion at LEAP and Stonewall, new contracts at the Washington 10 Storage Complex and additional growth related to our equity method investments.

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Gathering

The Gathering segment includes gathering systems, related treatment plants and compression and surface facilities. Gathering results and outlook are discussed below:

	Year Ended December 31,
	2024		2023		2022
	(millions)
Operating revenues	$	538	$	545	$	581
Operation and maintenance	176		190		213
Depreciation and amortization	135		113		107
Taxes other than income	17		13		14
Asset (gains) losses and impairments, net	—		—		(17)
Operating Income	210		229		264
Interest expense	106		95		80
Interest income	(3)		—		(2)
Loss from financing activities	2		—		7
Other income	(3)		(1)		(1)
Income tax expense	30		29		38
Net Income Attributable to DT Midstream	$	78	$	106	$	142

Operating revenues decreased $7 million for the year ended December 31, 2024 primarily due to lower volumes and recovery of production-related operating expenses on Blue Union Gathering of $19 million and lower Susquehanna Gathering volumes of $16 million, partially offset by a full year of operations at Ohio Utica Gathering of $18 million and higher Appalachia Gathering volumes of $12 million. Operating revenues decreased $36 million for the year ended December 31, 2023 primarily due to lower Blue Union Gathering revenues of $50 million, lower Michigan System gathering services of $6 million, and lower Susquehanna Gathering volumes of $3 million, partially offset by higher Appalachia Gathering volumes of $21 million driven primarily by new contracts resulting from the expansion in 2023. Lower Blue Union Gathering revenues were driven primarily by lower deficiency fees of $23 million, lower recovery of production-related operating expenses of $12 million, lower rates of $9 million and lower production volumes of $5 million.

Operation and maintenance expense decreased $14 million for the year ended December 31, 2024 primarily due to lower planned maintenance and production-related operating expenses on Blue Union Gathering of $18 million, partially offset by a full year of operations at Ohio Utica Gathering. Operation and maintenance expense decreased $23 million for the year ended December 31, 2023 primarily due to lower Blue Union Gathering expenses of $14 million driven by lower production-related operating expenses, a reduction in Appalachia Gathering environmental contingent liabilities of $6 million, and increased capitalized labor and overhead of $3 million.

Depreciation and amortization expense increased $22 million for the year ended December 31, 2024 primarily due to assets placed into service at Ohio Utica Gathering, Blue Union Gathering, and Appalachia Gathering. Depreciation and amortization expense increased $6 million for the year ended December 31, 2023 primarily due to new Blue Union Gathering and Appalachia Gathering assets placed into service.

Taxes other than income increased $4 million for the year ended December 31, 2024 primarily due to assets placed into service at Blue Union Gathering.

Asset (gains) losses and impairments, net decreased $17 million for the year ended December 31, 2023 due to the 2022 one-time gain on sale of certain assets in the Utica Shale region. See Note 2, "Significant Accounting Policies" to the Consolidated Financial Statements under Part II, Item 8 of this Form 10-K.

Interest expense increased $11 million for the year ended December 31, 2024 primarily due to lower capitalized interest driven by lower construction in progress during 2024 and higher interest related to the Bridge Facility and 2034 Notes issued in 2024. This increase was partially offset by lower outstanding borrowings under the Revolving Credit Facility and the repayment of the Term Loan Facility during 2024. Interest expense increased $15 million for the year ended December 31, 2023 primarily due to higher borrowings and interest rates under the Revolving Credit Facility, higher interest rates on the Term Loan Facility, and a full year of interest expense related to our 2032 Notes, partially offset by higher capitalized interest due to higher construction in progress during 2023.

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Loss from financing activities increased $2 million for the year ended December 31, 2024 primarily due to the repayment of our remaining Term Loan Facility that occurred during the current year. Loss from financing activities decreased $7 million for the year ended December 31, 2023 due to the partial repayment of our Term Loan Facility that occurred during the three months ended June 30, 2022. See Note 10, "Debt" to the Consolidated Financial Statements under Part II, Item 8 of this Form 10-K.

Income tax expense increased $1 million for the year ended December 31, 2024 primarily due to deferred tax remeasurement adjustments for changes in state tax rates and apportionment factors due to the Midwest Pipeline Acquisition and enacted state legislation, partially offset by lower income before income taxes. Income tax expense decreased $9 million for the year ended December 31, 2023 primarily due to lower income before income taxes in 2023. Income tax expense for the years ended December 31, 2023 and 2022 include the impacts of net tax benefits related to state tax rate changes. See Note 7, "Income Taxes" to the Consolidated Financial Statements under Part II, Item 8 of this Form 10-K.

Gathering Outlook

We believe our long-term agreements with producers and the quality of the natural gas reserves in the Marcellus/Utica and Haynesville formations position the business for future growth. We will continue to pursue economically attractive expansion opportunities that leverage our current asset footprint and strategic relationships. These growth opportunities include further expansions at Blue Union Gathering, Appalachia Gathering, Ohio Utica Gathering, Tioga Gathering and Clean Fuels Gathering.

ENVIRONMENTAL MATTERS

We are subject to extensive U.S. federal, state, and local environmental regulations. Additional compliance costs may result as the effects of various substances on the environment are studied and governmental regulations are developed and implemented. Actual costs to comply with such regulation could vary substantially from our expectations. Pending or future legislation or regulation could have a material impact on our operations and financial position. Potential impacts include unplanned expenditures for environmental equipment, such as pollution control equipment, financing costs related to additional capital expenditures, and the replacement costs of aging pipelines and other facilities.

For further discussion of environmental matters, see Part I, Items 1. and 2. "Business and Properties — Regulatory Environment — Environmental and Occupational Health and Safety Regulations" and Note 12, "Commitments and Contingencies" to the Consolidated Financial Statements under Part II, Item 8 of this Form 10-K.

CLIMATE CHANGE

We believe we have an opportunity to address climate change and have made strategically aligned environmental investment decisions a priority. Our Board of Directors includes a committee focused on environmental, social and governance initiatives, and our strategy will focus on targeted growth from carbon-reducing technologies associated with our current platforms. We have announced our intent to employ carbon-reducing technologies as part of our goal of being leading environmental stewards in the midstream industry, and we are executing on a plan to achieve net zero carbon emissions by 2050. We established our baseline Scope 1 carbon emissions in 2021 and are targeting a 30% reduction from this baseline by 2030.

In 2024, we completed the Clean Fuels Acquisition and advanced our carbon capture and sequestration project in Louisiana through completion of the Class V test well. The carbon capture and sequestration Class VI permit application was transferred to the Louisiana Department of Energy and Natural Resources in February 2024, and we are awaiting the completion of their review.

In future years, we plan to continue to make progress on opportunities for energy transition advancements leveraging our existing assets, competencies and partnerships. These opportunities include the following:

•Our efforts to advance our Louisiana carbon capture project, as well as other potential carbon capture projects across our geographic regions;

•Our Clean Fuels Gathering project to capture fugitive methane emissions; and

•Our strategic joint development agreement with Mitsubishi Power Americas, Inc. to advance hydrogen development projects across the United States.

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Capital project investments have been contemplated in our forecasted capital expenditures discussed in the Capital Investments section below. DT Midstream published our third annual Corporate Sustainability Report in 2024. The information in our Corporate Sustainability Report is not incorporated by reference into this Form 10-K.

For discussion of various risks including transitional risks associated with climate change related laws and regulations, reputational risks of climate change, and the physical risks of climate change, see Part I, Item 1A. "Risk Factors—Risks Relating to Our Business—Regulatory Risks—Risks related to climate change could materially adversely affect our business, financial condition, results of operations, cash flow, access to and cost of capital or insurance, reputation, and business strategies." of this Form 10-K. For discussion of recent climate change related laws and regulations, see Part I, Items 1. and 2. "Business and Properties—Regulatory Environment—Environmental and Occupational Health and Safety Regulations—Climate Change" of this Form 10-K.

CAPITAL RESOURCES AND LIQUIDITY

Cash Requirements

Our principal liquidity requirements are to finance our operations, fund capital expenditures, satisfy our indebtedness obligations, and pay approved dividends. We believe we will have sufficient internal and external capital resources to fund anticipated capital and operating requirements.

	Year Ended December 31,
	2024		2023		2022
	(millions)
Cash and Cash Equivalents at Beginning of Period	$	56	$	61	$	132
Net cash and cash equivalents from operating activities	763		798		725
Net cash and cash equivalents used for investing activities	(1,081)		(351)		(854)
Net cash and cash equivalents from (used for) financing activities	330		(452)		58
Net Increase (Decrease) in Cash and Cash Equivalents	12		(5)		(71)
Cash and Cash Equivalents at End of Period	$	68	$	56	$	61

For purposes of the following discussion, any increases or decreases refer to the comparison of the year ended December 31, 2024 to the year ended December 31, 2023 and the year ended December 31, 2023 to the year ended December 31, 2022.

Operating Activities

Cash flows from our operating activities can be impacted in the short term by the natural gas volumes gathered or transported through our systems under interruptible service revenue contracts, changing natural gas prices, seasonality, weather fluctuations, dividends received from equity method investees, working capital changes and the financial condition of our customers. Our preference to enter into firm service revenue contracts leads to more stable operating performance, revenues and cash flows and limits our exposure to natural gas price fluctuations.

Net cash and cash equivalents from operating activities decreased $35 million for the year ended December 31, 2024 primarily due to a decrease in working capital changes and a decrease in dividends received from equity method investees, partially offset by a decrease in cash paid for income taxes and an increase in operating income after adjustment for non-cash items including depreciation and amortization expense, stock-based compensation, and amortization of operating lease right-of-use assets.

Net cash and cash equivalents from operating activities increased $73 million for the year ended December 31, 2023 primarily due to a decrease in cash paid for taxes, net changes in working capital, an increase in operating income after adjustment for non-cash items including depreciation and amortization expense, stock-based compensation, amortization of operating lease right-of-use assets, and assets (gains) losses and impairments, and an increase in dividends received from equity method investees. These increases were partially offset by an increase in interest expense.

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Investing Activities

Cash outflows associated with our investing activities are primarily the result of plant and equipment expenditures, acquisitions, and contributions to equity method investees. Cash inflows from our investing activities are generated from proceeds from sale or collection of Notes receivable, distributions received from equity method investees, and proceeds from asset sales.

On December 31, 2024, we closed on the Midwest Pipeline Acquisition of three FERC-regulated natural gas transmission pipelines for $1.2 billion. See Note 16, "Acquisitions" to the Consolidated Financial Statements under Part II, Item 8 of this Form 10-K.

As a result of the sales of senior unsecured notes at our equity method investees, we received net distributions from Millennium of $416 million and NEXUS of $371 million during the years ended December 31, 2024 and 2023, respectively. See Note 1, "Description of the Business and Basis of Presentation" to the Consolidated Financial Statements under Part II, Item 8 of this Form 10-K.

Net cash and cash equivalents used for investing activities increased $730 million for the year ended December 31, 2024 primarily due to cash consideration for the Midwest Pipeline Acquisition, partially offset by a decrease in cash used for plant and equipment expenditures and higher distributions received from equity method investees, including those noted above.

Net cash and cash equivalents used for investing activities decreased $503 million for the year ended December 31, 2023 primarily due to the acquisition of an additional 26.25% ownership interest in the Millennium from National Grid in 2022 and higher distributions received from equity method investees in 2023, including the NEXUS distribution noted above. This change was partially offset by an increase in cash used for plant and equipment expenditures for expansions on LEAP, Blue Union Gathering, Appalachia Gathering, and Ohio Utica Gathering, and a decrease in proceeds from the sale of notes receivable.

Financing Activities

In December 2024, we issued the 2034 Notes in aggregate principal amount of $650 million, and we amended the Credit Agreement to, among other things, extend the Revolving Credit Facility maturity date to 2029. In November 2024, we amended our Credit Agreement to permit the Company to incur certain customary bridge loans, including the Bridge Facility. In September 2024, we repaid the remaining indebtedness under the Term Loan Facility of $399 million. See Note 10, "Debt" to the Consolidated Financial Statements under Part II, Item 8 of this Form 10-K.

In November 2024, we issued 4,168,750 common shares for net proceeds of approximately $406 million. DT Midstream paid cash dividends on common stock of $280 million, $263 million, and $244 million during the years ended December 31, 2024, 2023 and 2022, respectively. See Note 8, "Earnings Per Share and Dividends" to the Consolidated Financial Statements under Part II, Item 8 of this Form 10-K.

In April 2022, we issued the 2032 Notes in aggregate principal amount of $600 million. We used the net proceeds from the sale of the 2032 Notes of $593 million to partially repay indebtedness under our Term Loan Facility.

Net cash and cash equivalents from financing activities of $330 million for the year ended December 31, 2024 increased as compared to net cash and cash equivalents used for financing activities of $452 million for the year ended December 31, 2023. The increase was primarily due to proceeds received from the issuance of common shares, proceeds received from the issuance of the 2034 Notes, and lower net repayments of borrowings under the Revolving Credit Facility, partially offset by the repayment of the Term Loan Facility and higher dividends paid on common stock.

Net cash and cash equivalents used for financing activities of $452 million for the year ended December 31, 2023 increased as compared to net cash and cash equivalents from financing activities of $58 million for the year ended December 31, 2022. The increase was primarily due to higher net repayments of borrowings under the Revolving Credit Facility, higher dividends paid on common stock, and lower proceeds from the issuance of long-term debt. The increase was partially offset by lower repayments of long-term debt.

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Outlook

We expect to continue executing on our natural gas-centric business strategy focused on disciplined capital deployment and supported by a flexible, well capitalized balance sheet. Other than the impact of the items discussed below on our debt and equity capitalization, we are not aware of any trends, other demands, commitments, events or uncertainties that are reasonably likely to materially impact our liquidity position.

Our working capital requirements will be primarily driven by changes in accounts receivable, accounts payable and taxes payable. We continue our efforts to identify opportunities to improve cash flows through working capital initiatives and obtaining long-term firm service revenue contracts from customers.

Our sources of liquidity include cash and cash equivalents generated from operating activities and available borrowings under our Revolving Credit Facility. As of December 31, 2024, we had $16 million of letters of credit outstanding and $150 million borrowings outstanding under our Revolving Credit Facility. We had approximately $902 million of available liquidity as of December 31, 2024, consisting of cash and cash equivalents and available borrowings under our Revolving Credit Facility.

We expect to pay regular cash dividends to DT Midstream common stockholders in the future. Any payment of future dividends is subject to approval by the Board of Directors and may depend on our future earnings, cash flows, capital requirements, financial condition, and the effect a dividend payment would have on our compliance with relevant financial covenants. Over the long-term, we expect to grow our dividend with cash flow growth.

We believe we will have sufficient operating flexibility, cash resources and funding sources to maintain adequate liquidity amounts and to meet future operating cash, capital expenditure and debt servicing requirements. However, our business is capital intensive, and the inability to access adequate capital could adversely impact future earnings and cash flows.

The Credit Agreement covering the Revolving Credit Facility includes financial covenants that DT Midstream must maintain. See Note 10, "Debt" to the Consolidated Financial Statements under Part II, Item 8 of this Form 10-K.

See also Note 12, "Commitments and Contingencies" to the Consolidated Financial Statements under Part II, Item 8 of this Form 10-K.

Credit Ratings

Credit ratings are intended to provide banks and capital market participants with a framework for comparing the credit quality of securities and are not a recommendation to buy, sell, or hold securities. Our credit ratings affect our cost of capital and other terms of financing, as well as our ability to access the credit and commercial paper markets. We believe that the current credit ratings provide sufficient access to capital markets. However, disruptions in the banking and capital markets not specifically related to us may affect our ability to access these funding sources or cause an increase in the return required by investors. During the year ended December 31, 2024, our credit rating was upgraded to investment-grade by Fitch Ratings and our outlook was upgraded to positive by both Moody's and S&P.

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Contractual Obligations

The following table details our contractual obligations due by year as of December 31, 2024:

	2025		2026		2027		2028		2029 and Thereafter
	(millions)
Short-term borrowings (a)	$	150	$	—	$	—	$	—	$	—
Long-term debt:
Senior notes (b)	—		—		—		—		2,100
Senior secured notes (c)	—		—		—		—		1,250
Letters of credit	—		—		—		—		16
Interest expense (d)	156		153		153		153		446
Operating lease payments	17		15		14		6		5
Purchase commitments	14		13		12		12		44
Total Contractual Obligations	$	337	$	181	$	179	$	171	$	3,861

_____________________________

(a) Short-term borrowings under our Revolving Credit Facility can be extended up to the October 2027 expiration date.

(b) Excludes $19 million of unamortized debt issuance costs.

(c) Excludes $1 million of unamortized debt discount and $11 million of unamortized debt issuance costs.

(d) Represents interest expense related to all Long-term debt.

CAPITAL INVESTMENTS

Capital spending within our Company is primarily for ongoing maintenance and expansion of our existing assets, and if identified, attractive growth opportunities. We have been disciplined in our capital deployment and make growth investments that meet our criteria in terms of strategy, management skills, and identified risks and expected returns. All potential investments are analyzed for their rates of return and cash payback on a risk-adjusted basis. Our total capital expenditures, inclusive of $5 million in contributions to equity method investees, were $355 million for the year ended December 31, 2024 primarily for expansions on Blue Union Gathering, Ohio Utica Gathering, LEAP and Appalachia Gathering. On December 31, 2024, we closed on the Midwest Pipeline Acquisition of three FERC-regulated natural gas transmission pipelines for $1.2 billion. See Note 16, "Acquisitions" to the Consolidated Financial Statements under Part II, Item 8 of this Form 10-K. We anticipate total capital expenditures, inclusive of contributions to equity method investees, for the year ended December 31, 2025 of approximately $470 million to $550 million.

OFF-BALANCE SHEET ARRANGEMENTS

We are party to off-balance sheet arrangements, which include our equity method investments. See Note 1, "Description of the Business and Basis of Presentation—Principles of Consolidation" to the Consolidated Financial Statements under Part II, Item 8 of this Form 10-K for further discussion of the nature, purpose and other details of such agreements.

Other off-balance sheet arrangements include the Vector line of credit and our surety bonds, which are discussed in Note 12, "Commitments and Contingencies" to the Consolidated Financial Statements under Part II, Item 8 of this Form 10-K.

INDEMNIFICATION OBLIGATIONS

We could have an indemnification obligation to DTE Energy pursuant to the Tax Matters Agreement and the Separation and Distribution Agreement. See Part I, Item 1A. "Risk Factors—Risks Related to the Separation—We agreed to numerous restrictions to preserve the non-recognition treatment of the Distribution, and we could have an indemnification obligation to DTE Energy in accordance with the terms of the Tax Matters Agreement if the Distribution were determined not to qualify for non-recognition treatment for U.S. federal tax purposes." of this Form 10-K for further details.

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CRITICAL ACCOUNTING ESTIMATES

The preparation of our Consolidated Financial Statements in conformity with GAAP requires that management apply accounting policies and make estimates and assumptions that affect results of operations and the amounts of assets and liabilities reported in the Consolidated Financial Statements. Management believes that the areas described below require significant judgment in the application of the accounting policy or in making estimates and assumptions in matters that are inherently uncertain and that may change in subsequent periods. See additional discussion of our accounting policies in the Notes to Consolidated Financial Statements in Item 8 of this Form 10-K.

Purchase Accounting

In accordance with business combination accounting guidance, the assets acquired and liabilities assumed in an acquired business are measured at their estimated fair values at the acquisition date. As discussed in the Regulation paragraph below, these acquired FERC-regulated pipelines are accounted for under ASC 980, and thus, the fair value of assets acquired and liabilities assumed subject to these provisions approximate their regulated basis, and therefore no fair value adjustments have been reflected related to these amounts. Customer relationship intangible assets are not subject to rate making and cost recovery provisions, and therefore do include fair value adjustments. Determining the fair value of these items required management's judgment and involved the use of significant estimates and assumptions with respect to the timing and amounts of future cash inflows and outflows, discount rates, market prices and asset lives, among other items. Changes to these estimates and assumptions could result in material changes to the fair value of assets and liabilities as of the acquisition date. For income tax purposes, the transaction is treated as a taxable deemed asset acquisition. Accordingly, the majority of deferred income tax assets and liabilities of the acquired entities are eliminated as the tax bases were increased to fair market value which equals net book value.

See Note 7, "Income Taxes" and Note 16, "Acquisitions" to the Consolidated Financial Statements under Part II, Item 8 of this Form 10-K.

Goodwill

We have goodwill that resulted from business combinations. Annually as of October 1st, an impairment test for goodwill is performed which compares the fair value of each reporting unit to its carrying value including goodwill. If the carrying value including goodwill exceeds the fair value of a reporting unit, an impairment loss would be recognized. A goodwill impairment loss is measured as the amount by which a reporting unit’s carrying value exceeds its fair value, not to exceed the carrying amount of goodwill.

The October 1, 2024 fair values for the reporting units were calculated using an income approach. The estimated fair value in our annual goodwill impairment analysis utilizes significant assumptions that require judgment by management. One such significant assumption is the weighted average cost of capital (WACC) which is used to discount estimates of projected future results and cash flows to be generated by each reporting unit. The WACC is based on our cost of debt, which includes U.S. industrial bond spreads, and cost of equity, which consists of U.S. Treasury Rates plus an equity risk premium. Another significant assumption is the terminal value that utilizes an assumed long-term growth rate, which incorporates management’s judgment regarding sustainable long-term growth of the reporting units.

Our annual goodwill impairment analysis included a comparison of the estimated fair value of the Company as a whole to our market capitalization. Management also compared the implied market multiple of the estimated fair value of each reporting unit to midstream industry transaction multiples and considered other market indicators to support the appropriateness of the fair value estimates.

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We performed our annual impairment test as of October 1, 2024 and determined that the estimated fair value of each reporting unit exceeded its carrying value, and no impairment existed. The results of the impairment test are as follows as of the October 1, 2024 valuation date:

Reporting Unit	Goodwill		Weighted Average Costs of Capital		Fair Value Reduction % (a)		Valuation Methodology (b)
	(millions)
Pipeline	$	53	7.5	%	65	%	DCF
Gathering	420		8.6	%	22	%	DCF
	$	473

_________________________________

(a) Percentage by which the estimated fair value of the reporting unit would need to decline to equal its carrying value including goodwill.

(b) Discounted cash flows (DCF) incorporated 2024 (fourth quarter) through 2028 projected cash flows plus a calculated terminal value. We calculated the terminal-year cash flows using an estimated long-term growth rate of 2.5%, discounted at the WACC for each of the reporting units.

In between annual impairment tests, we monitor our estimates and assumptions regarding estimated future cash flows, including the impact of movements in market indicators, and will update the impairment analysis if a triggering event occurs. While we believe the estimates and assumptions in the fair value are reasonable, the actual results may differ from projections. To the extent projected results or cash flows are revised downward, the reporting unit may be required to write down all or a portion of its goodwill, which would adversely impact our earnings. If current expectations of future long-term growth are not met or market factors outside of our control change, such as U.S. Treasury Rates or a decline in midstream industry transaction multiples, this may lead to a goodwill impairment in the future. See Part II, Item 7A., "Quantitative and Qualitative Disclosures About Market Risk", in this Form 10-K for more information on our exposure to market risk.

On December 31, 2024, we completed the Midwest Pipeline Acquisition, which resulted in an addition of $303 million to goodwill under the Pipeline reporting unit. This addition occurred after the completion of our annual impairment test as of October 1, 2024. As part of our year-end procedures, we performed a qualitative assessment of the goodwill balance, including the newly added goodwill from the acquisition, and determined there were no indicators of impairment as of December 31, 2024. See Note 16, "Acquisitions" to the Consolidated Financial Statements under Part II, Item 8 of this Form 10-K.

Assessment of Long-Lived Assets for Impairment

We evaluate the carrying value of long-lived assets, excluding goodwill, when circumstances indicate that the carrying value of those assets may not be recoverable. Conditions that could have an adverse impact on the cash flows and fair value of the long-lived assets are a deteriorating business climate, condition of the asset, or plans to dispose of or abandon the asset before the end of its useful life, which could result from the loss of or reduction in volume from our customers. The review of long-lived assets for impairment requires significant assumptions about operating strategies and estimates of future cash flows, which require assessments of current and projected market conditions and anticipated customer revenues. An impairment evaluation is based on an undiscounted cash flow analysis at the lowest level for which independent cash flows of long-lived assets can be identified from other groups of assets and liabilities. Impairment may occur when the carrying value of the asset exceeds the future undiscounted cash flows. When the undiscounted cash flow analysis indicates a long-lived asset is not recoverable, the amount of the impairment loss is determined by measuring the excess of the long-lived asset over its fair value. An impairment would require us to reduce both the long-lived asset and current period earnings by the amount of the impairment, which would adversely impact our earnings. As part of our ongoing reviews of business operations and associated long-lived assets, we did not identify any indicators of impairment that existed during 2024.

Depreciation and Amortization of Long-Lived Assets

We compute depreciation and amortization based on estimated useful lives. These estimates are based on various factors including condition, manufacturing specifications, technological advances and historical data concerning useful lives of similar assets. Uncertainties that impact these estimates include economic conditions and supply and demand in the area. When assets are put into service, we make estimates with respect to useful lives and salvage values that we believe are reasonable. However, subsequent events could cause us to change our estimates, thus impacting the future calculation of depreciation and amortization. For our regulated assets, depreciation studies to assess the estimated useful lives of the asset are typically conducted as part of rate proceedings or tariff filings, which can result in changes in economic lives. Changes in economic lives, if applicable, are implemented prospectively as of the tariff approved effective date.

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Assessment of Equity Method Investments for Impairment

We assess at each balance sheet date whether there is objective evidence that the equity method investment is impaired by completing a quantitative or qualitative analysis of factors impacting the investment. If there is objective evidence of impairment, we determine whether the decline below carrying value is other than temporary. If the decline is determined to be other than temporary, an impairment charge is recorded in earnings with an offsetting reduction to the carrying value of the investment. As part of our ongoing reviews of equity method investment operations, we did not identify any indicators of impairment that existed during 2024.

Regulation

Guardian, Midwestern and Viking are subject to rate regulation and accounting requirements of the FERC. The regulated operations of each of these subsidiaries have rates that are (i) established by independent, third-party regulators, (ii) set at levels that will recover our costs when considering the demand and competition for our services and (iii) collectible from our customers. Accordingly, we follow the accounting for regulated operations as defined in ASC 980, Regulated Operations for these pipelines, which results in differences in the application of GAAP between our regulated and non-regulated businesses. These entities are required to record regulatory assets and liabilities for certain transactions that would have been treated as revenue or expense in non-regulated businesses. Future regulatory changes could result in changes in the amounts of regulatory assets and liabilities or the discontinuance of this accounting treatment for regulatory assets and liabilities for some or all of our regulated businesses. We believe that currently available facts support the continued use of regulatory accounting and that all regulatory assets and liabilities are recoverable or refundable in the current regulatory environment.

See Note 17, "Regulatory Matters" to the Consolidated Financial Statements under Part II, Item 8 of this Form 10-K.

NEW ACCOUNTING PRONOUNCEMENTS

See Note 3, "New Accounting Pronouncements" to the Consolidated Financial Statements under Part II, Item 8 of this Form 10-K.

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Item 7A. Quantitative and Qualitative Disclosures About Market Risk

Market Price Risk

Our gathering business is dependent on the continued availability of natural gas production and reserves in our geographical areas of operation. Low prices for natural gas, including those resulting from regional basis differentials, could adversely affect development of additional reserves and future natural gas production that is accessible by our pipeline and storage assets. We manage our exposure through the use of short, medium, and long-term transportation, gathering, and storage contracts. Consequently, our existing operations and cash flows have limited direct exposure to natural gas price risk.

Credit Risk

We are exposed to credit risk, which is the risk of loss resulting from nonpayment or nonperformance under a contract. We manage our exposure to credit risk associated with customers through credit analysis, credit approval, credit limits and monitoring procedures. For certain transactions, we may request letters of credit, cash collateral, prepayments or guarantees as forms of credit support. Our FERC tariffs require tariff customers that do not meet specified credit standards to provide three months of credit support, however, we are exposed to credit risk beyond this three-month period when our tariffs do not require our customers to provide additional credit support. For some long-term contracts with associated system construction or expansion, we have entered into negotiated credit agreements that provide for enhanced forms of credit support if certain customer credit standards are not met.

We depend on a key customer, Expand Energy, in the Haynesville formation in the Gulf Coast and in the Marcellus formation in the Northeastern U.S. for a significant portion of our revenues. The loss of, or reduction in volumes from, this key customer could result in a decline in demand for our services and materially adversely affect our business, financial condition and results of operations.

Our key customer, Expand Energy, is investment grade. We engage with other customers that are sub-investment grade. These customers are otherwise considered creditworthy or are required to make prepayments or provide security to satisfy credit concerns. We regularly monitor for bankruptcy proceedings that may impact our customers and had no bankruptcy proceedings during the year ended December 31, 2024.

Interest Rate Risk

We are subject to interest rate risk in connection with floating rate debt borrowings under our Revolving Credit Facility. Our exposure to interest rate risk arises primarily from changes in SOFR. As of December 31, 2024, we had floating rate debt of $150 million related to borrowings outstanding under our Revolving Credit Facility, and a floating rate debt-to-total debt ratio of 4.29%. See Note 10, "Debt" to the Consolidated Financial Statements under Part II, Item 8 of this Form 10-K.

We are subject to interest rate risk in connection with our goodwill impairment assessment. See "Critical Accounting Estimates" under Part II, Item 7 of this Form 10-K.

Summary of Sensitivity Analysis

A sensitivity analysis was performed on the fair values of our long-term debt obligations. The sensitivity analysis involved increasing and decreasing interest rates as of December 31, 2024 by a hypothetical 10% and calculating the resulting change in the fair values. The hypothetical losses related to long-term debt would be realized only if we transferred all of our fixed-rate long-term debt to other creditors. The results of the sensitivity analysis are as follows:

	Assuming a 10% Increase in Rates		Assuming a 10% Decrease in Rates		Change in the Fair Value of
Activity	As of December 31, 2024
	(millions)
Interest rate risk	$	(100)	$	104	Long-term debt

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Item 8. Financial Statements

The following Consolidated Financial Statements are included herein:

	Page
Report of Independent Registered Public Accounting Firm (PCAOB ID 238)	56
Consolidated Statements of Operations	58
Consolidated Statements of Comprehensive Income	59
Consolidated Statements of Financial Position	60
Consolidated Statements of Cash Flows	62
Consolidated Statements of Changes in Stockholders' Equity	63
Notes to Consolidated Financial Statements	64
Note 1 — Description of the Business and Basis of Presentation	64
Note 2 — Significant Accounting Policies	67
Note 3 — New Accounting Pronouncements	69
Note 4 — Revenue	69
Note 5 — Goodwill	72
Note 6 — Property, Plant, and Equipment and Intangible Assets	73
Note 7 — Income Taxes	74
Note 8 — Earnings Per Share and Dividends	77
Note 9 — Fair Value	78
Note 10 — Debt	79
Note 11 — Leases	81
Note 12 — Commitments and Contingencies	83
Note 13 — Stock-Based Compensation and Defined Contribution Plans	84
Note 14 — Segment and Related Information	86
Note 15 — Related Party Transactions	89
Note 16 — Acquisitions	89
Note 17 — Regulatory Matters	91
Note 18 — Subsequent Event	93

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Report of Independent Registered Public Accounting Firm

To the Board of Directors and Stockholders of DT Midstream, Inc.

Opinions on the Financial Statements and Internal Control over Financial Reporting

We have audited the accompanying consolidated statements of financial position of DT Midstream, Inc. and its subsidiaries (the “Company”) as of December 31, 2024 and 2023, and the related consolidated statements of operations, of comprehensive income, of changes in stockholders' equity and of cash flows for each of the three years in the period ended December 31, 2024, 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, 2024, 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, 2024 and 2023, and the results of its operations and its cash flows for each of the three years in the period ended December 31, 2024 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, 2024, 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.

As described in Management’s Report on Internal Control over Financial Reporting, management has excluded three FERC-regulated natural gas transmission pipelines (“Midwest Pipeline Acquisition”) from its assessment of internal control over financial reporting as of December 31, 2024 because they were acquired by the Company in a purchase business combination on December 31, 2024. We have also excluded the Midwest Pipeline Acquisition from our audit of internal control over financial reporting. The three FERC-regulated natural gas transmission pipelines are wholly-owned subsidiaries whose total revenues and total assets excluded from management’s assessment and our audit of internal control over financial reporting represent less than 1 percent and approximately 10 percent, respectively, of the related consolidated financial statement amounts as of and for the year ended December 31, 2024 (the 10 percent calculation excludes assets related to acquired goodwill and other intangible assets, as they were included in management’s assessment).

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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.

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 Matters

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.

Equity Method Investments in NEXUS Gas Transmission, LLC and Millennium Pipeline Intermediate Holdings, LLC

As described in Note 1 to the consolidated financial statements, non-controlled investments are accounted for using the equity method of accounting when the Company is able to significantly influence the operating policies of the investee. Under the equity method of accounting, investments are recorded at historical cost as an asset and adjusted for capital contributions, dividends and distributions received, and the Company’s share of the investee’s earnings or losses, which are recorded as earnings from equity method investees. The Company’s equity method investments are periodically evaluated for certain factors that may be indicative of other-than-temporary impairment. As of December 31, 2024, the Company’s equity method investment balance in NEXUS Gas Transmission, LLC (“NEXUS”) and Millennium Pipeline Intermediate Holdings, LLC (“Millennium”) was $880 million and $283 million, respectively. For the year ended December 31, 2024, earnings from equity method investees for NEXUS and Millennium were $62 million and $59 million, respectively.

The principal consideration for our determination that performing procedures relating to the equity method investments in NEXUS and Millennium is a critical audit matter is a high degree of auditor effort in performing procedures related to these equity method investments.

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 equity method investments. These procedures also included, among others, the following, which were performed as of and for the year ended December 31, 2024 for NEXUS and Millennium (collectively “the investees”): (i) vouching capital contributions, dividends and distributions to source documents, (ii) confirming specific unaudited financial information with the investees, (iii) reconciling the investee financial information per Company records to the investees’ independently audited financial statements, (iv) recalculating the Company’s carrying amount of its investments in the investees that exceeded the Company’s share of the underlying equity in the net assets and the related amortization of such differences, (v) performing inquiries with management, and inspecting supporting evidence and documentation, to understand and evaluate management’s consideration of accounting matters, including management’s assertion that there were no indicators of other-than-temporary impairment, and (vi) performing procedures to evaluate subsequent events impacting the investees.

/s/ PricewaterhouseCoopers LLP

Detroit, Michigan

February 26, 2025

We have served as the Company’s auditor since 2020.

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DT Midstream, Inc.

Consolidated Statements of Operations

	Year Ended December 31,
	2024		2023		2022
	(millions, except per share amounts)
Revenues
Operating revenues	$	981	$	922	$	920
Operating Expenses
Operation and maintenance	244		245		267
Depreciation and amortization	209		182		170
Taxes other than income	39		28		28
Asset (gains) losses and impairments, net	—		(4)		(23)
Operating Income	489		471		478
Other (Income) and Deductions
Interest expense	153		150		137
Interest income	(7)		(1)		(3)
Earnings from equity method investees	(162)		(177)		(150)
Loss from financing activities	5		—		13
Other income	(4)		(1)		(1)
Income Before Income Taxes	504		500		482
Income Tax Expense	137		104		100
Net Income	367		396		382
Less: Net Income Attributable to Noncontrolling Interests	13		12		12
Net Income Attributable to DT Midstream	$	354	$	384	$	370
Basic Earnings per Common Share
Net Income Attributable to DT Midstream	$	3.63	$	3.97	$	3.83
Diluted Earnings per Common Share
Net Income Attributable to DT Midstream	$	3.60	$	3.94	$	3.81
Weighted Average Common Shares Outstanding
Basic	97.6		96.9		96.7
Diluted	98.4		97.5		97.2

See Notes to Consolidated Financial Statements

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DT Midstream, Inc.

Consolidated Statements of Comprehensive Income

	Year Ended December 31,
	2024		2023		2022
	(millions)
Net Income	$	367	$	396	$	382
Foreign currency translation and unrealized gain on derivatives, net of tax	—		2		—
Other comprehensive income	—		2		—
Comprehensive income	367		398		382
Less: Comprehensive income attributable to noncontrolling interests	13		12		12
Comprehensive Income Attributable to DT Midstream	$	354	$	386	$	370

See Notes to Consolidated Financial Statements

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DT Midstream, Inc.

Consolidated Statements of Financial Position

	December 31,
	2024		2023
	(millions)
ASSETS
Current Assets
Cash and cash equivalents	$	68	$	56
Accounts receivable (net of $— allowance for expected credit loss for each period end)	172		154
Deferred property taxes	33		31
Taxes receivable	8		15
Prepaid expenses and other	29		16
	310		272
Investments
Investments in equity method investees	1,297		1,762
Property
Property, plant, and equipment	6,525		5,282
Accumulated depreciation	(998)		(848)
	5,527		4,434
Other Assets
Goodwill	776		473
Long-term notes receivable — related party	4		4
Operating lease right-of-use assets	49		38
Intangible assets, net	1,921		1,968
Other	51		31
	2,801		2,514
Total Assets	$	9,935	$	8,982

See Notes to Consolidated Financial Statements

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DT Midstream, Inc.

Consolidated Statements of Financial Position

	December 31,
	2024		2023
	(millions, except shares)
LIABILITIES AND EQUITY
Current Liabilities
Accounts payable	$	77	$	94
Short-term borrowings	150		165
Operating lease liabilities	16		13
Dividends payable	75		67
Interest payable	12		10
Property taxes payable	42		34
Accrued compensation	19		18
Contract liabilities	18		18
Other	17		15
	426		434
Long-Term Debt, net	3,319		3,065
Other Liabilities
Deferred income taxes	1,129		1,031
Operating lease liabilities	36		27
Contract liabilities	135		111
Regulatory liabilities	90		—
Other	34		34
	1,424		1,203
Total Liabilities	5,169		4,702
Commitments and Contingencies (Note 12)
Stockholders' Equity
Preferred stock ($0.01 par value, 50,000,000 shares authorized, and no shares issued or outstanding as of December 31, 2024 and 2023)	—		—
Common stock ($0.01 par value, 550,000,000 shares authorized, and 101,324,894 and 96,971,021 shares issued and outstanding as of December 31, 2024 and 2023, respectively)	1		1
Additional paid-in capital	3,911		3,485
Retained earnings	723		661
Accumulated other comprehensive income (loss)	(8)		(8)
Total DT Midstream Equity	4,627		4,139
Noncontrolling interests	139		141
Total Equity	4,766		4,280
Total Liabilities and Equity	$	9,935	$	8,982

See Notes to Consolidated Financial Statements

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DT Midstream, Inc.

Consolidated Statements of Cash Flows

	Year Ended December 31,
	2024		2023		2022
	(millions)
Operating Activities
Net Income	$	367	$	396	$	382
Adjustments to reconcile Net Income to Net cash and cash equivalents from operating activities:
Depreciation and amortization	209		182		170
Stock-based compensation	23		20		17
Amortization of operating lease right-of-use assets	18		18		19
Deferred income taxes	120		110		70
Earnings from equity method investees	(162)		(177)		(150)
Dividends from equity method investees	161		196		181
Asset (gains) losses and impairments, net	—		—		(17)
Loss from financing activities	5		—		13
Changes in assets and liabilities:
Accounts receivable, net	11		7		8
Accounts payable	11		(5)		7
Contract liabilities	23		97		3
Other current and noncurrent assets and liabilities	(23)		(46)		22
Net cash and cash equivalents from operating activities	763		798		725
Investing Activities
Plant and equipment expenditures	(350)		(772)		(338)
Acquisition accounted for as a business combination	(1,198)		—		—
Proceeds from sale of notes receivable	—		—		22
Distributions from equity method investees	472		427		17
Contributions to equity method investees	(5)		(7)		(5)
Acquisition of additional interest in equity method investee	—		—		(552)
Other investing activities	—		1		2
Net cash and cash equivalents used for investing activities	(1,081)		(351)		(854)
Financing Activities
Issuance of long-term debt, net of discount and issuance costs	644		—		591
Repayment of long-term debt	(399)		—		(596)
Borrowings under the Revolving Credit Facility	385		540		370
Repayment of borrowings under the Revolving Credit Facility	(400)		(705)		(40)
Payment of Revolving Credit Facility issuance costs	(3)		—		(3)
Issuance of common stock, net of issuance costs	406		—		—
Distributions to noncontrolling interests	(17)		(18)		(14)
Dividends paid on common stock	(280)		(263)		(244)
Other financing activities	(6)		(6)		(6)
Net cash and cash equivalents from (used for) financing activities	330		(452)		58
Net Increase (Decrease) in Cash and Cash Equivalents	12		(5)		(71)
Cash and Cash Equivalents at Beginning of Period	56		61		132
Cash and Cash Equivalents at End of Period	$	68	$	56	$	61
Supplemental disclosure of cash information
Cash paid for:
Interest, net of interest capitalized	$	140	$	140	$	125
Income taxes	12		22		24
Supplemental disclosure of non-cash investing and financing activities
Plant and equipment expenditures in accounts payable and other accrued liabilities	$	44	$	80	$	99

See Notes to Consolidated Financial Statements

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DT Midstream, Inc.

Consolidated Statements of Changes in Stockholders' Equity

				Additional Paid-In Capital		Retained Earnings		Accumulated Other Comprehensive Income (Loss)		Noncontrolling Interests
	Common Stock
	Shares	Amount										Total
	(dollars in millions, shares in thousands)
Balance, December 31, 2021	96,734	$	1	$	3,450	$	431	$	(10)	$	149	$	4,021
Net Income	—	—		—		370		—		12		382
Dividends declared on common stock ($2.56 per common share)	—	—		—		(248)		—		—		(248)
Distributions to noncontrolling interests	—	—		—		—		—		(14)		(14)
Stock-based compensation	78	—		17		(2)		—		—		15
Repurchase of common stock	(57)	—		—		(3)		—		—		(3)
Taxes and other adjustments	—	—		2		(1)		—		—		1
Balance, December 31, 2022	96,755	$	1	$	3,469	$	547	$	(10)	$	147	$	4,154
Net Income	—	—		—		384		—		12		396
Dividends declared on common stock ($2.76 per common share)	—	—		—		(268)		—		—		(268)
Distributions to noncontrolling interests	—	—		—		—		—		(18)		(18)
Stock-based compensation and other	216	—		16		(2)		—		—		14
Other comprehensive income, net of tax	—	—		—		—		2		—		2
Balance, December 31, 2023	96,971	$	1	$	3,485	$	661	$	(8)	$	141	$	4,280
Net Income	—	—		—		354		—		13		367
Issuance of common stock, net of issuance costs (a)	4,169	—		406		—		—		—		406
Dividends declared on common stock ($2.94 per common share)	—	—		—		(288)		—		—		(288)
Contributions from noncontrolling interests	—	—		—		—		—		2		2
Distributions to noncontrolling interests	—	—		—		—		—		(17)		(17)
Stock-based compensation and other	185	—		20		(4)		—		—		16
Balance, December 31, 2024	101,325	$	1	$	3,911	$	723	$	(8)	$	139	$	4,766

_____________________________________

(a)Issuance of common shares at $0.01 par value. See Note 8, "Earnings Per Share and Dividends," to the Consolidated Financial Statements.

See Notes to Consolidated Financial Statements

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DT Midstream, Inc.

Notes to Consolidated Financial Statements

NOTE 1 — DESCRIPTION OF THE BUSINESS AND BASIS OF PRESENTATION

Description of the Business

DT Midstream is an owner, operator, and developer of an integrated portfolio of natural gas midstream assets. We provide multiple, integrated natural gas services to customers through two segments: (i) Pipeline, which includes interstate pipelines, intrastate pipelines, storage systems, gathering lateral pipelines including related treatment plants and compression and surface facilities, and (ii) Gathering, which includes gathering systems, related treatment plants, and compression and surface facilities. Our Pipeline segment also includes joint venture interests in equity method investees which own and operate interstate pipelines that connect to our wholly owned assets. On December 31, 2024, we closed on the Midwest Pipeline Acquisition of three FERC-regulated natural gas transmission pipelines. See Note 16, "Acquisitions" to the Consolidated Financial Statements.

Our core assets strategically connect key demand centers in the Midwestern U.S., Eastern Canada and Northeastern U.S. regions to the premium production areas of the Marcellus/Utica natural gas formation in the Appalachian Basin, and connect key demand centers and LNG export terminals in the Gulf Coast region to premium production areas of the Haynesville natural gas formation.

Basis of Presentation`

The Consolidated Financial Statements and Notes to Consolidated Financial Statements are prepared under GAAP.

These accounting principles require management to use estimates and assumptions that impact reported amounts of assets, liabilities, revenues and expenses, and the disclosure of contingent assets and liabilities. Actual results may differ from our estimates. We believe the assumptions underlying these financial statements are reasonable.

In our opinion, the accompanying Consolidated Financial Statements include all adjustments, consisting of normal recurring adjustments, necessary to present a fair statement of our financial position as of December 31, 2024, results of operations for the years ended December 31, 2024, 2023 and 2022, statement of changes in stockholders' equity for the years ended December 31, 2024, 2023 and 2022, and cash flows for the years ended December 31, 2024, 2023 and 2022.

Cash Management

Our sources of liquidity include cash generated from operations and available borrowings under our Revolving Credit Facility.

Principles of Consolidation

We consolidate all majority-owned subsidiaries and investments in entities in which we have a controlling influence. Non-controlled investments are accounted for using the equity method of accounting when we are able to significantly influence the operating policies of the investee. When we do not influence the operating policies of an investee, the equity investment is measured at fair value, if readily determinable, or if not readily determinable, at cost less impairment, if applicable. We eliminate all intercompany balances and transactions.

We evaluate whether an entity is a VIE whenever reconsideration events occur. We consolidate VIEs for which we are the primary beneficiary. When assessing the determination of the primary beneficiary, we consider all relevant facts and circumstances, including: the power, through voting or similar rights, to direct the activities of the VIE that most significantly impact the VIE's economic performance and the obligation to absorb the expected losses and/or the right to receive the expected returns of the VIE. We perform ongoing reassessments of all VIEs to determine if the primary beneficiary status has changed.

We own an 85% interest in the Stonewall VIE and are the primary beneficiary, therefore Stonewall is consolidated. We own a 50% interest in the South Romeo VIE and are the primary beneficiary, therefore South Romeo is consolidated.

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DT Midstream, Inc.

Notes to Consolidated Financial Statements

The following table summarizes the major line items in the Consolidated Statements of Financial Position for consolidated VIEs as of December 31, 2024 and 2023. All assets and liabilities of a consolidated VIE are included in the table when it has been determined that a consolidated VIE has either (1) assets that can be used only to settle obligations of the VIE or (2) liabilities for which creditors do not have recourse to the general credit of the primary beneficiary. The assets and liabilities of consolidated VIEs that meet the definition of a business and whose assets can be used for purposes other than the settlement of the VIEs' obligations have been excluded from the table below.

	December 31,
	2024		2023
	(millions)
ASSETS (a)
Cash	$	17	$	13
Accounts receivable	11		10
Other current assets	2		2
Intangible assets, net	468		483
Property, plant and equipment, net	391		391
Goodwill	25		25
	$	914	$	924
LIABILITIES (a)
Accounts payable and other current liabilities	$	5	$	4
Other noncurrent liabilities	3		3
	$	8	$	7

_____________________________________

(a)Amounts shown are 100% of the consolidated VIEs' assets and liabilities.

Related Parties

Transactions between DT Midstream and our equity method investees have been presented as related party transactions in the accompanying Consolidated Financial Statements. See Note 15, "Related Party Transactions" to the Consolidated Financial Statements.

Equity Method Investments

Non-controlled investments are accounted for using the equity method of accounting when we are able to significantly influence the operating policies of the investee. Under the equity method of accounting, investments are recorded at historical cost as an asset and adjusted for capital contributions, dividends and distributions received, and our share of the investee's earnings or losses, which are recorded as earnings from equity method investees on the Consolidated Statements of Operations. Equity method investments and related activity are included in the Pipeline segment.

Our equity method investments are periodically evaluated for certain factors that may be indicative of other-than-temporary impairment. As of December 31, 2024 and 2023, our carrying amounts of investments in equity method investees exceeded our share of the underlying equity in the net assets of the investees by $336 million and $352 million, respectively. The difference will be amortized over the life of the underlying assets. As of both December 31, 2024 and 2023, our consolidated retained earnings balance did not have undistributed earnings from equity method investments. We use the cumulative earnings approach to classify proceeds received from equity method investees as dividends or distributions on the Consolidated Statements of Cash Flows.

Earnings from equity method investees include:

	Year Ended December 31,
	2024		2023		2022
	(millions)
NEXUS	$	62	$	68	$	61
Vector	41		38		36
Millennium	59		71		53
Total earnings from equity method investees	$	162	$	177	$	150

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DT Midstream, Inc.

Notes to Consolidated Financial Statements

Equity method investees are described below:

	Investments As of				% Owned As of
	December 31,				December 31,
Equity Method Investee	2024		2023		2024	2023
	(millions)
NEXUS	$	880	$	900	50%	50%
Vector	134		135		40%	40%
Millennium	283		727		52.5%	52.5%
Total investments in equity method investees	$	1,297	$	1,762

In September 2024, Millennium closed on the sale of $800 million of senior unsecured notes with a weighted-average coupon rate of 5.88%. We received a distribution from Millennium of $416 million, net of fees and expenses, which reduced our investment balance. We used the proceeds from the distribution to repay our existing indebtedness under our Term Loan Facility and for general corporate purposes.

In May 2023, NEXUS closed on the sale of $750 million of senior unsecured notes with a weighted-average coupon rate of 5.52%. We received a distribution from NEXUS of $371 million, net of fees and expenses, which reduced our investment balance. We used the proceeds from the distribution to repay borrowings outstanding under our Revolving Credit Facility.

In October 2022, DT Midstream closed on the $552 million purchase of an additional 26.25% ownership interest in Millennium from National Grid. The transaction was financed with cash on hand and available capacity under the Company's Revolving Credit Facility. The purchase constituted National Grid's full ownership interest in Millennium and brought our total ownership interest in Millennium to 52.5%. We account for our ownership interest in Millennium under the equity method of accounting. Millennium is not a VIE and we do not have a controlling interest due to shared control with our partner over all of Millennium's significant business activities. Our carrying amount of our Millennium investment exceeded our share of the underlying equity in the net assets of Millennium by $343 million on the acquisition date.

The following tables present summarized financial information of our non-consolidated equity method investees. The amounts included below represent 100% of the results of continuing operations of such entities, including the portion owned by other parties.

Summarized balance sheet data is as follows:

	December 31,
	2024		2023
	(millions)
Current assets	$	170	$	159
Noncurrent assets	3,939		4,057
Current liabilities	209		208
Noncurrent liabilities	$	1,930	$	1,177

Summarized income statement data is as follows:

	Year Ended December 31,
	2024		2023		2022
	(millions)
Operating revenues	$	818	$	823	$	800
Operating expenses	376		377		396
Net Income	$	364	$	392	$	372

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DT Midstream, Inc.

Notes to Consolidated Financial Statements

NOTE 2 — SIGNIFICANT ACCOUNTING POLICIES

Cash and Cash Equivalents

Cash and cash equivalents include cash in banks and highly liquid money market investments with remaining maturities of three months or less, when purchased. Cash equivalents are stated at cost, which approximates fair value.

Financing Receivables

Financing receivables are primarily composed of trade accounts receivable and notes receivable, which are stated at net realizable value.

We regularly monitor the credit quality of our financing receivables by reviewing counterparty credit quality indicators and monitoring for triggering events, such as a credit rating downgrade or bankruptcy. We have three internal grades of credit quality, with internal grade 1 as the lowest risk and internal grade 3 as the highest risk. The related credit quality indicators and risk ratings utilized to develop the internal grades have been updated through December 31, 2024. As of December 31, 2024, the notes receivable — related party of $4 million, which originated prior to 2021, was classified as internal grade 1. There are no notes receivable on nonaccrual status and no past due financing receivables as of December 31, 2024.

Notes receivable are typically considered delinquent (past due) when payment is not received for periods ranging from 60 to 120 days. We cease accruing interest income (nonaccrual status) and may either write off or establish an allowance for expected credit loss for the note receivable when it is expected that all contractual principal or interest amounts due will not be collected. In determining an allowance for expected credit losses for or the write off of notes receivable, we consider the historical payment experience and other factors that are expected to have a specific impact on collection, including existing and future economic conditions. Cash receipts for notes receivable on nonaccrual status that do not bring the account contractually current are first applied to contractually owed past due interest, with any remainder applied to principal. Recognition of interest income is generally resumed when the note receivable becomes contractually current.

We had an investment in certain assets in the Utica Shale region which was accounted for as a note receivable — third party. A third party purchased our investment in certain assets in the Utica Shale region based on significantly improved commodity pricing during the second quarter 2022 for proceeds of $22 million. This resulted in a gain of $17 million recorded in Asset (gains) losses and impairments, net on the Consolidated Statement of Operations. We maintain no continuing involvement with the note receivable.

For trade accounts receivable, the customer allowance for expected credit loss is calculated based on specific review of future collections based on receivable balances generally in excess of 30 days. Existing and future economic conditions, historical loss rates, customer trends and other relevant factors that may affect our ability to collect are also considered. Receivables are written off on a specific identification basis and determined based on the particular circumstances of the associated receivable. Uncollectible expense (recovery) was zero for each of the years ended December 31, 2024, 2023 and 2022.

Our collections on accounts receivable from customers are current, and no material rate of historical loss was noted, which resulted in no allowance for expected credit loss as of December 31, 2024 or 2023. Any balance would be shown as a deduction from the respective financing receivable's balance in the Consolidated Statements of Financial Position.

Property, Plant, and Equipment

Property is stated at cost and includes construction-related labor, materials, overhead and capitalized interest. Property for FERC-Regulated entities includes equity AFUDC. Equity AFUDC represents the capitalization of the estimated average cost of equity during construction projects and is recorded as a credit to allowance for funds used during construction in our Consolidated Statements of Operations. Expenditures for maintenance and repairs are charged to expense when incurred. Property, plant and equipment is depreciated over its estimated useful life using the straight-line method. See Note 6, "Property, Plant, and Equipment and Intangible Assets" to the Consolidated Financial Statements.

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DT Midstream, Inc.

Notes to Consolidated Financial Statements

On December 31, 2024, DT Midstream closed on the Midwest Pipeline Acquisition of three FERC-regulated natural gas transmission pipelines. These assets are accounted for under ASC 980, which in some cases requires that the cost of regulated property retired or sold, plus removal costs, less salvage, be charged to accumulated depreciation. For regulated assets, depreciation studies to assess the estimated useful lives of the asset are typically conducted as part of rate proceedings or tariff filings. Changes in economic lives, if applicable, are implemented prospectively as of the approved effective date. See Note 16, "Acquisitions" and Note 17, "Regulatory Matters" to the Consolidated Financial Statements.

Intangible Assets

Intangible assets with finite useful lives are amortized on a straight-line basis over the periods benefited. See Note 6, "Property, Plant, and Equipment and Intangible Assets" to the Consolidated Financial Statements.

Long-Lived Assets

Long-lived assets are reviewed for impairment whenever events or changes in circumstances indicate the carrying amount of an asset may not be recoverable. If the carrying amount of the asset exceeds the expected undiscounted future cash flows generated by the asset, an impairment loss is recognized resulting in the asset being written down to its estimated fair value. Assets to be disposed of are reported at the lower of the carrying amount or fair value, less costs to sell.

Purchase Accounting

In accordance with the business combination acquisition method of accounting, the assets acquired and liabilities assumed in an acquired business are measured at their estimated fair values at the acquisition date.

Goodwill

DT Midstream has goodwill resulting from business combinations. For each reporting unit with goodwill, we perform an impairment test annually or whenever events or circumstances indicate that the value of goodwill may be impaired.

Operation and Maintenance

Operation and maintenance is primarily comprised of costs for labor and employee benefits, outside services, materials, compression, purchased natural gas, operating lease costs, office costs, and other operating and maintenance costs.

Depreciation and Amortization

Depreciation and amortization is related to Property, plant and equipment and Customer relationships and other intangible assets, net, used in our transportation, storage and gathering businesses.

Other Significant Accounting Policies

Footnote	Title
Note 1	Equity Method Investments
Note 4	Revenue
Note 7	Income Taxes
Note 9	Fair Value
Note 11	Leases
Note 14	Reportable Segments
Note 16	Acquisitions
Note 17	Regulation

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DT Midstream, Inc.

Notes to Consolidated Financial Statements

NOTE 3 — NEW ACCOUNTING PRONOUNCEMENTS

Recently Adopted Pronouncements

In November 2023, the FASB issued ASU No. 2023-07, Segment Reporting (Topic 280) - Improvements to Reportable Segment Disclosures. The amendments improve reportable segment disclosure requirements, primarily through enhanced disclosures about significant segment expenses and interim disclosure requirements. The amendments are effective for fiscal years beginning after December 15, 2023 and interim periods within fiscal years beginning after December 15, 2024. Early adoption is permitted. We adopted this ASU on December 31, 2024, and applied the amendments retrospectively to all prior periods presented in our Consolidated Financial Statements. See Note 14, "Segment and Related Information," to the Consolidated Financial Statements.

Recently Issued Pronouncements

In December 2023, the FASB issued ASU No. 2023-09, Income Taxes (Topic 740) - Improvements to Income Tax Disclosures. The amendments improve transparency of income tax disclosure requirements, primarily through enhanced disclosures of rate reconciliation and income taxes paid. The amendments are effective for annual periods beginning after December 15, 2024. Early adoption is permitted. We continue to evaluate the impact of this standard's adoption on our Consolidated Financial Statements.

In November 2024, the FASB issued ASU No. 2024-03, Income Statement—Reporting Comprehensive Income—Expense Disaggregation Disclosures (Subtopic 220-40) - Disaggregation of Income Statement Expenses. The amendments require enhanced disclosures of specified costs and expenses included in significant expense captions in the income statement, including purchases of inventory, employee compensation, depreciation, amortization, and other key amounts. The FASB subsequently issued ASU No. 2025-01 in January 2025 to clarify the effective date of ASU No. 2024-03. The amendments are effective for fiscal years beginning after December 15, 2026 and interim reporting periods within annual reporting periods beginning after December 15, 2027. Early adoption is permitted. We are currently evaluating the impact of this standard's adoption on our Consolidated Financial Statements.

NOTE 4 — REVENUE

Significant Accounting Policy – Revenue

Pipeline revenues consist of services related to the gathering, transportation and/or storage of natural gas. Gathering revenues consist of services related to the gathering, processing, and/or treating of natural gas. Revenue is measured based upon the pricing or consideration for such services specified in the contract with a customer. Consideration may consist of both fixed components including fixed demand charges and fixed deficiency fee rates for MVCs, and variable components including fixed rates for the actual volumes flowed under interruptible services and other associated fees.

Our contracts with customers generally contain a single performance obligation, which is a promise to deliver either a distinct service or a series of distinct services to the customer. When multiple performance obligations exist, the contract consideration is allocated between the performance obligations based on the relative standalone selling price, which is determined by prices charged to customers or the adjusted market assessment approach. The adjusted market assessment approach involves evaluating the market in which we sell services and estimating the price that a customer in that market would be willing to pay.

Revenue is recognized when performance obligations are satisfied by delivering a service to a customer, which occurs when the service is provided to the customer. When a customer simultaneously receives and consumes the service provided, revenue is recognized over time. Alternatively, if it is determined that the criteria for recognition of revenue over time is not met, the revenue is considered to be recognized at a point in time. Our revenues, including estimated unbilled amounts, are generally recognized over time as actual services are provided, or ratably over time when providing a stand-ready service. Unbilled amounts are generally determined using preliminary meter data volumes and contracted pricing, and typically result in minor adjustments. Generally, uncertainties in the variable consideration components are resolved and revenue amounts are known at the time of recognition. We have determined that the above methods represent a faithful depiction of delivering a service to the customer. Revenues are typically billed and consideration received monthly, however, certain deficiency fees related to MVCs are billed quarterly or annually.

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DT Midstream, Inc.

Notes to Consolidated Financial Statements

Disaggregation of Revenue

The following is a summary of revenues disaggregated by segment:

	Year Ended December 31,
	2024		2023		2022
	(millions)
Pipeline (a)	$	443	$	377	$	339
Gathering	538		545		581
Total operating revenues	$	981	$	922	$	920

__________________________________

(a) Includes revenues outside the scope of ASC 606 primarily related to contracts accounted for as leases of $9 million, $7 million and $10 million for the years ended December 31, 2024, 2023 and 2022, respectively.

Nature of Services

We primarily provide two types of revenue services: firm service and interruptible service. Firm service revenue contracts provide for fixed revenue commitments regardless of actual volumes of natural gas that flow, which leads to more stable operating performance, revenues and cash flows and limits our exposure to natural gas price fluctuations. Firm service revenue contracts are typically long-term and structured using fixed demand charges or MVCs with fixed deficiency fee rates. Contracts structured using fixed demand charges contain a performance obligation of a stand-ready series of distinct services that are substantially the same with the same pattern of transfer to the customer, therefore revenue is recognized ratably over time. Contracts structured using MVCs with fixed deficiency fee rates require customers to transport or store a minimum volume of natural gas over a specified time period. If a customer fails to meet its MVCs for the specified time period, the contract consideration includes a fixed rate for the actual volumes gathered, transported or stored, and a deficiency fee for the shortfall between the MVCs and the actual volumes gathered, transported, or stored. If a customer exceeds its MVC for the specified time period, the contract consideration is based on fixed rates for the actual volumes gathered, transported, or stored. The contract consideration is allocated to each distinct monthly performance obligation, consistent with the allocation objective and based upon the level of effort required to satisfy the service obligation. Revenues are generally recognized over time based on the output measure of natural gas volumes gathered, transported, or stored, with the recognition of the deficiency fee revenue in the period when it is known the customer cannot make up the deficient volumes in the specified time period. Interruptible service revenue contracts typically contain fixed rates, with total consideration dependent on actual natural gas volumes that flow. Interruptible service revenues are recognized over time based on the output measure of natural gas volumes gathered, transported, or stored. Certain of our gathering contracts allow for the recovery of production-related operating expenses, which are offsetting in revenue and operating expense. Recovery of production-related operating expenses were $51 million, $53 million and $65 million for the years ended December 31, 2024, 2023 and 2022, respectively.

Contract Liabilities

The following is a summary of contract liability activity:

	2024		2023
	(millions)
Balance as of January 1	$	129	$	32
Increases due to cash received or receivable, excluding amounts recognized as revenue during the period (a)	47		101
Revenue recognized that was included in the balance at the beginning of the period	(23)		(4)
Balance as of December 31	$	153	$	129

__________________________________

(a) During the year ended December 31, 2024 and 2023, we collected prepayment amounts from customers under various long-term revenue contracts on Ohio Utica Gathering, Appalachia Gathering, Blue Union Gathering and LEAP.

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DT Midstream, Inc.

Notes to Consolidated Financial Statements

Contract liabilities generally represent amounts paid by or receivable from customers for which the associated performance obligation has not yet been satisfied. Contract liabilities associated with these services are recognized upon delivery of the service to the customer.    

The following table presents contract liability amounts as of December 31, 2024 that are expected to be recognized as revenue in future periods:

	(millions)
2025	$	18
2026	18
2027	18
2028	16
2029	16
2030 and thereafter	67
Total	$	153

Transaction Price Allocated to the Remaining Performance Obligations

In accordance with optional exemptions available under ASC 606, we do not disclose the value of unsatisfied performance obligations for (1) contracts with an original expected length of one year or less, (2) with the exception of fixed consideration, contracts for which the amount of revenue recognized depends upon our invoices for actual volumes gathered, transported, or stored, and (3) contracts for which variable consideration relates entirely to an unsatisfied performance obligation.

Such contracts consist of various types of performance obligations, including providing midstream services. Contracts with variable volumes and/or variable pricing, including those with pricing provisions tied to a consumer price or other index, have also been excluded as the related contract consideration is variable at the contract inception. Contract lengths vary from cancellable to multi-year.

The following table presents revenue amounts related to fixed consideration associated with unsatisfied performance obligations as of December 31, 2024 that are expected to be recognized as revenue in future periods:

	(millions)
2025	$	265
2026	223
2027	226
2028	181
2029	149
2030 and thereafter	268
Total	$	1,312

Costs to Obtain or Fulfill a Contract

We recognize an asset from the costs incurred to obtain a revenue contract only if we expect to recover those costs. In addition, the costs to fulfill a revenue contract are capitalized if the costs are specifically identifiable to a revenue contract, would result in enhancing resources that will be used in satisfying performance obligations in the future, and are expected to be recovered. These capitalized costs are amortized on a systematic basis consistent with the pattern of transfer of the services to which such costs relate.

As of December 31, 2024 and 2023, we had capitalized costs to obtain or fulfill a contract of $18 million, which are included in other current assets and other noncurrent assets in the accompanying Consolidated Statements of Financial Position. During the years ended December 31, 2024, 2023 and 2022 we recognized $1 million of amortization expense related to such capitalized costs.

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DT Midstream, Inc.

Notes to Consolidated Financial Statements

Major Customers

The following table summarizes the customer which represents 10% or more of our total revenue for the years ended December 31, 2024, 2023 and 2022. Both Pipeline and Gathering segments provided services to this customer.

	2024				2023				2022
	Customer		Percentage		Customer		Percentage		Customer		Percentage
	Revenue		of Total		Revenue		of Total		Revenue		of Total
Customer:	(millions, except percentages)
Expand Energy	$	555	56	%	$	560	60	%	$	596	65	%

NOTE 5 — GOODWILL

We have goodwill that resulted from business combinations. The carrying value of goodwill is evaluated for impairment on an annual basis or whenever events or circumstances indicate that the value of goodwill may be impaired. We performed our annual impairment test as of October 1, 2024 and determined that the estimated fair value of each reporting unit exceeded its carrying value, and no impairment existed. We recognized goodwill as of December 31, 2024 as part of the Midwest Pipeline Acquisition in the Pipeline reporting unit. See Note 16, "Acquisitions" to the Consolidated Financial Statements.

The following is the summary of the change in the carrying amount of goodwill:

	2024		2023
	(millions)
Balance at January 1	$	473	$	473
Goodwill attributable to the Midwest Pipeline Acquisition	303		—
Balance at December 31	$	776	$	473

The following is a summary of the carrying value of goodwill by reporting unit:

	December 31,
	2024		2023
	(millions)
Pipeline	$	356	$	53
Gathering	420		420
Total goodwill	$	776	$	473

While we believe the estimates and assumptions in the estimated fair value are reasonable, the actual results may differ from projections. To the extent projected results or cash flows are revised downward, the reporting unit may be required to write down all or a portion of its goodwill, which would adversely impact our earnings.

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DT Midstream, Inc.

Notes to Consolidated Financial Statements

NOTE 6 — PROPERTY, PLANT, AND EQUIPMENT AND INTANGIBLE ASSETS

Property, Plant, and Equipment

The following is a summary of Property, plant, and equipment by classification:

	Average Estimated Useful Life	December 31,
		2024		2023
	(years)	(millions)
Property, plant, and equipment
Land and other non-depreciable assets	N/A	$	105	$	96
Rights of way and easements	25 to 53	168		103
Pipelines and interconnects	10 to 95	4,437		3,460
Facilities and processing plants	7 to 50	1,364		1,234
Wells and well equipment	40 to 70	70		70
General plant	3 to 40	60		40
Construction in progress	N/A	321		279
Total Property, plant, and equipment		$	6,525	$	5,282
Less accumulated depreciation		(998)		(848)
Net Property, plant, and equipment		$	5,527	$	4,434

Intangible Assets

The following is a summary of Intangible Assets by classification:

		December 31, 2024						December 31, 2023
	Useful Lives	Gross Carrying Value		Accumulated Amortization		Net Carrying Value		Gross Carrying Value		Accumulated Amortization		Net Carrying Value
		(millions)
Intangible assets subject to amortization
Customer relationships	3 - 40 years (a)	$	2,262	$	(345)	$	1,917	$	2,252	$	(289)	$	1,963
Contract intangibles	14 - 26 years	18		(14)		4		18		(13)		5
Total		$	2,280	$	(359)	$	1,921	$	2,270	$	(302)	$	1,968

_____________________________________

(a) The useful lives of the customer relationship intangible assets are based on the number of years in which the assets are expected to economically contribute to the business. The expected economic benefit incorporates existing customer contracts and expected renewal rates based on the estimated volume and production lives of natural gas resources in each region.

The following table summarizes estimated customer relationships and contract intangibles amortization expense to be recognized during each year through 2029:

	2025		2026		2027		2028		2029
	(millions)
Estimated amortization expense	$	60	$	60	$	60	$	59	$	59

Depreciation and Amortization

The following is a summary of depreciation and amortization expense by asset type:

	Year Ended December 31,
	2024		2023		2022
	(millions)
Property, plant, and equipment	$	152	$	125	$	113
Customer relationships and other intangible assets, net	57		57		57
Total Depreciation and amortization	$	209	$	182	$	170

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DT Midstream, Inc.

Notes to Consolidated Financial Statements

NOTE 7 — INCOME TAXES

Significant Accounting Policy – Accounting for Income Taxes

We record the effect of income taxes in accordance with GAAP, which provides for the use of an asset and liability approach. Deferred income tax assets and liabilities are recognized for temporary differences between the basis of assets and liabilities for financial reporting and tax purposes and measured using enacted tax rates in effect for the year in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities as a result of changes in the enacted tax rates is recognized in earnings in the period of enactment. Our recognition of deferred tax assets is based upon a more-likely-than-not criterion. We routinely assess realizability based on objectively-weighted, available positive and negative evidence.

We account for uncertainties in income taxes using a benefit recognition model with a two-step approach: a more-likely-than-not recognition criterion, and a measurement attribute that measures the position as the largest amount of tax benefit that is greater than a 50% likelihood of being realized upon ultimate settlement. If the benefit does not meet the more likely than not criteria for being sustained on its technical merits, no benefit will be recorded. Uncertain tax positions that relate only to timing of when an item is included on a tax return are considered to have met the recognition threshold.

Midwest Pipeline Acquisition

The Midwest Pipeline Acquisition was treated as a deemed asset acquisition which was taxable for federal and state income tax purposes as a result of 1) making tax elections promulgated under Internal Revenue Code §338(h)(10) for the acquired entities which were treated as corporations under Subchapter C of the Internal Revenue Code, and 2) all single member Limited Liability Companies ("LLC") being treated as disregarded entities for income tax purposes. Accordingly, the majority of deferred income tax assets and liabilities of the acquired entities are eliminated as the tax bases were increased to fair market value which equals net book value. The election resulted in tax-deductible goodwill which is subject to revision during the one-year period as additional information is obtained about facts and circumstances that existed at closing and purchase price allocations are completed/reported on income tax returns.

As a result of changes to the expected state apportionment factors and rates due to the Midwest Pipeline Acquisition, the Company recorded a remeasurement to increase the existing deferred income tax liabilities of DT Midstream (acquiring entity) by $22 million which was charged to income tax expense. See Note 16, "Acquisitions" to the Consolidated Financial Statements.

Tax Legislation

On December 4, 2024, the State of Louisiana enacted a series of tax bills aimed at overall tax reform across multiple state tax regimes including income, franchise, and sales and use. House Bill 2 imposes a flat 5.5% (previously tiered from 3.5% to 7.5%) corporate income tax rate beginning January 1, 2025. In accordance with tax accounting guidance, DT Midstream recorded the remeasurement as a deferred income tax benefit of $4 million. Other enacted law changes include the repeal of the Louisiana franchise tax and increased state sales and use tax rates, which will take effect in future years and are not expected to have a material impact on the financial statements.

On July 8, 2022, the Commonwealth of Pennsylvania enacted House Bill 1342 which includes a corporate income tax rate reduction from 9.99% to 4.99% that will phase-in over a nine-year period.

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DT Midstream, Inc.

Notes to Consolidated Financial Statements

Our total Income Tax Expense varied from the statutory federal income tax rate for the following reasons:

	Year Ended December 31,
	2024			2023			2022
	(millions)
Income Before Income Taxes	$	504		$	500		$	482
Income tax expense at statutory rate	106			105			101
State and local income taxes, net of federal benefit	18			18			24
State tax rate changes	15			(18)			(25)
Other, net	(2)			(1)			—
Income Tax Expense	$	137		$	104		$	100
Effective income tax rate	27.3		%	20.9		%	20.7		%

The State tax rate changes line in the table above includes state deferred remeasurements recorded in each of the respective years discussed below.

Our 2024 effective tax rate includes a $15 million expense driven by updates to state rates and apportionment factors, primarily related to the Midwest Pipeline Acquisition and tax legislation, as discussed above.

Our 2023 effective tax rate includes the impact of state tax rate changes of an $18 million benefit driven by changes in tax status and updates to state apportionment which were completed in 2023 as a part of ongoing corporate tax structuring, simplification initiatives, and initial post-separation full-year tax return filings.

Our 2022 effective tax rate includes the impact of state tax rate changes of a $25 million benefit driven by the Pennsylvania legislative changes.

Components of Income tax expense were as follows:

	Year Ended December 31,
	2024		2023		2022
	(millions)
Current income tax expense
Federal	$	13	$	(4)	$	16
State and other income tax	4		(2)		14
Total current income tax expense	17		(6)		30
Deferred income tax expense
Federal	84		109		86
State and other income tax	36		1		(16)
Total deferred income tax expense	120		110		70
Total Income Tax Expense	$	137	$	104	$	100

Deferred tax assets and liabilities are recognized for the estimated future tax effect of temporary differences between the tax basis of assets or liabilities and the reported amounts in our Consolidated Financial Statements. We believe it is more likely than not that we will generate sufficient taxable income in future periods to realize our deferred tax assets.

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DT Midstream, Inc.

Notes to Consolidated Financial Statements

Deferred tax assets (liabilities) were comprised of the following:

	December 31,
	2024		2023
	(millions)
Deferred income tax balance components
Property, plant, and equipment	$	(369)	$	(369)
Federal net operating loss carry-forward	117		184
State and local net operating loss carry-forward, net of federal	75		102
Investment in equity method investees and partnerships	(970)		(979)
Other	18		31
Net deferred income tax asset / (liability)	$	(1,129)	$	(1,031)
Total deferred income tax assets and liabilities
Deferred income tax assets	$	266	$	319
Deferred income tax liabilities	(1,395)		(1,350)
Net deferred income tax asset / (liability)	$	(1,129)	$	(1,031)

We have recorded a deferred tax asset related to a federal net operating loss carry-forward of $117 million as of December 31, 2024. U.S. federal net operating losses will be available to be carried forward indefinitely and available to offset 80% of taxable income in future years.

We have recorded state and local deferred tax assets related to net operating loss carry-forwards of $75 million as of December 31, 2024. Of the state and local net operating loss carry-forwards, $70 million can be carried indefinitely and $5 million will expire from 2033 through 2042 and are available to offset varying amounts of taxable income in future years.

Uncertain Tax Positions

As of December 31, 2024 and 2023, we did not have any unrecognized tax benefits. Our income tax returns remain subject to examination by federal, state, and local taxing jurisdictions.

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DT Midstream, Inc.

Notes to Consolidated Financial Statements

NOTE 8 — EARNINGS PER SHARE AND DIVIDENDS

Basic earnings per share is calculated by dividing Net Income attributable to DT Midstream by the weighted-average number of common shares outstanding during the period. Diluted earnings per share reflect the dilution that would occur if any potentially dilutive instruments were exercised or converted into common shares, using the treasury stock method. Restricted stock units and performance share awards, including dividend equivalents on those grants, are potentially dilutive and, if dilutive, are included in the determination of weighted-average shares outstanding. Restricted stock units and performance share awards do not receive cash dividends, as such, these awards are not considered participating securities.

In November 2024, we issued 4,168,750 common shares at a price to the public of $101.00 per share and received net proceeds of approximately $406 million in anticipation of the Midwest Pipeline Acquisition. See Note 16, "Acquisitions" to the Consolidated Financial Statements.

The following is a reconciliation of basic and diluted earnings per share:

	Year Ended December 31,
	2024		2023		2022
	(millions, except per share amounts)
Basic and Diluted Earnings per Common Share
Net Income Attributable to DT Midstream	$	354	$	384	$	370
Average number of common shares outstanding — basic	97.6		96.9		96.7
Incremental shares attributable to:
Average dilutive restricted stock units and performance share awards	0.8		0.6		0.5
Average number of common shares outstanding — diluted	98.4		97.5		97.2
Basic Earnings per Common Share	$	3.63	$	3.97	$	3.83
Diluted Earnings per Common Share	$	3.60	$	3.94	$	3.81

We declared the following cash dividends:

Dividends Declared	Dividend Amount				Dividend Payment Date
(quarter ended)	(per-share)		(millions)
2022
March 31	$	0.64	$	62	April 2022
June 30	$	0.64	$	62	July 2022
September 30	$	0.64	$	62	October 2022
December 31	$	0.64	$	62	January 2023
2023
March 31	$	0.69	$	67	April 2023
June 30	$	0.69	$	67	July 2023
September 30	$	0.69	$	67	October 2023
December 31	$	0.69	$	67	January 2024
2024
March 31	$	0.735	$	71	April 2024
June 30	$	0.735	$	71	July 2024
September 30	$	0.735	$	71	October 2024
December 31	$	0.735	$	75	January 2025

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DT Midstream, Inc.

Notes to Consolidated Financial Statements

NOTE 9 — FAIR VALUE

Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date in a principal or most advantageous market. Fair value is a market-based measurement that is determined based on inputs, which refer broadly to assumptions that market participants use in pricing assets or liabilities. These inputs can be readily observable, market corroborated, or generally unobservable inputs. We make certain assumptions we believe that market participants would use in pricing assets or liabilities, including assumptions about risk, and the risks inherent in the inputs to valuation techniques. We believe we use valuation techniques that maximize the use of observable market-based inputs and minimize the use of unobservable inputs.

Significant Accounting Policy – Fair Value

A fair value hierarchy has been established that prioritizes the inputs to valuation techniques used to measure fair value in three broad levels. The fair value hierarchy gives the highest priority to quoted prices (unadjusted) in active markets for identical assets or liabilities (Level 1) and the lowest priority to unobservable inputs (Level 3). In some cases, the inputs used to measure fair value might fall in different levels of the fair value hierarchy. All assets and liabilities are required to be classified in their entirety based on the lowest level of input that is significant to the fair value measurement in its entirety. Assessing the significance of a particular input may require judgment considering factors specific to the asset or liability and may affect the valuation of the asset or liability and its placement within the fair value hierarchy. We classify fair value balances based on the fair value hierarchy defined as follows:

•Level 1 — Consists of unadjusted quoted prices in active markets for identical assets or liabilities that we have the ability to access as of the reporting date.

•Level 2 — Consists of inputs other than quoted prices included within Level 1 that are directly observable for the assets or liabilities or indirectly observable through corroboration with observable market data.

•Level 3 — Consists of unobservable inputs for assets or liabilities whose fair value is estimated based on internally developed models or methodologies using inputs that are generally less readily observable and supported by little, if any, market activity at the measurement date. Unobservable inputs are developed based on the best available information and subject to cost-benefit constraints.

Fair Value of Financial Instruments

The following table presents the carrying amount and fair value of financial instruments:

	December 31, 2024								December 31, 2023
	Carrying		Fair Value						Carrying		Fair Value
	Amount		Level 1		Level 2		Level 3		Amount		Level 1		Level 2		Level 3
	(millions)
Cash equivalents (a)	$	—	$	—	$	—	$	—	$	36	$	—	$	36	$	—
Long-term notes receivable — related party	4		—		—		4		4		—		—		4
Short-term borrowings (a)	150		—		150		—		165		—		165		—
Long-term debt (b)	$	3,319	$	—	$	3,136	$	—	$	3,065	$	—	$	2,850	$	—

______________________________________

(a)Short-term borrowings and money market cash equivalents are stated at cost, which approximates fair value.

(b)Carrying value as of December 31, 2024 and 2023 represents principal of $3.4 billion and $3.1 billion, respectively, net of unamortized debt discounts and issuance costs.

On December 31, 2024, we closed on the Midwest Pipeline Acquisition, and assets acquired and liabilities assumed were measured at estimated fair value. See Note 16, "Acquisitions" to the Consolidated Financial Statements.

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DT Midstream, Inc.

Notes to Consolidated Financial Statements

NOTE 10 — DEBT

Amendments to Credit Agreement

In December 2024, we amended our Credit Agreement to, among other things, extend the Revolving Credit Facility maturity date to December 2029 and implement customary "limited condition transaction provisions", enabling us to enter into future acquisitions and other transactions with the conditionality to the consummation thereof subject only to customary "SunGard" conditions, which provide additional financing certainty and reduce the number of conditions required. In November 2024, we amended our Credit Agreement to permit the Company to incur certain customary bridge loans, including the Bridge Facility, a $700 million 364-day bridge loan facility committed by Barclays Bank PLC, which provided certain backstop funding for our Midwest Pipeline Acquisition. Bridge Facility issuance fees of $4 million were incurred during the year ended December 31, 2024 and recorded as interest expense on our Consolidated Statements of Operations.

In June 2023, we amended our Credit Agreement which modified certain of the terms, including, among other things, the replacement of the interest rate provisions related to the Term Loan Facility from Eurodollar Rate to Term SOFR (as defined in the Credit Agreement).

In October 2022, we amended the Credit Agreement to increase the Revolving Credit Facility commitments by $250 million to aggregate commitments of $1.0 billion. The amendment also extended the Revolving Credit Facility maturity date to October 2027, replaced the Revolving Credit Facility's LIBOR interest rate references with Term SOFR, and incorporated various amendments, including amendments to pricing, guarantee and collateral provisions, that will become effective if we receive an investment-grade rating from two of the three credit rating agencies.

Debt Issuances

In November 2024, we issued $650 million in aggregate principal amount of 5.800% senior secured notes due December 2034. The 2034 Notes are guaranteed by certain of our subsidiaries and secured by a first priority lien on certain assets of DT Midstream and our subsidiary guarantors that secure our existing credit facilities. As part of the issuance of the 2034 Notes, we capitalized debt issuance costs and discount costs of approximately $5 million and $1 million, respectively.

In April 2022, we issued $600 million in aggregate principal amount of 4.300% senior secured notes due April 2032. The 2032 Notes are guaranteed by certain of our subsidiaries and secured by a first priority lien on certain assets of DT Midstream and our subsidiary guarantors that secure our existing credit facilities. The 2032 Notes have a security fall away provision where the collateral securing the notes will be released if we receive an investment-grade rating from two of the three credit rating agencies.

Debt Redemptions

In September 2024, we repaid the remaining indebtedness under the Term Loan Facility of $399 million. The early redemption resulted in a loss on extinguishment of debt of $4 million related to the write-off of unamortized discount and issuance costs, which was recorded as a loss from financing activities on our Consolidated Statements of Operations for the year ended December 31, 2024. There were no prepayment costs in conjunction with the early redemption of the Term Loan Facility.

In April 2022, we used $593 million of the net proceeds from the sale of the 2032 Notes to make a partial repayment on the existing indebtedness under the Term Loan Facility. The early redemption resulted in a loss on extinguishment of debt of $9 million and loss on modification of debt of $4 million related to the write-off of unamortized discount and issuance costs, which was recorded as a loss from financing activities in our Consolidated Statements of Operations for the year ended December 31, 2022. There were no prepayment costs in conjunction with the partial redemption of the Term Loan Facility.

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DT Midstream, Inc.

Notes to Consolidated Financial Statements

Interest Expense

The following table summarizes our interest expense:

	Year Ended December 31,
	2024		2023		2022
	(millions)
Interest expense	$	163	$	170	$	142
Capitalized interest	(10)		(20)		(5)
Total interest expense, net	$	153	$	150	$	137

Long-Term Debt

The following is a summary of long-term debt:

			Maturity	December 31,		December 31,
Title	Type	Interest Rate	Date	2024		2023
				(millions)
2029 Notes	Senior Notes (a)	4.125%	2029	$	1,100	$	1,100
2031 Notes	Senior Notes (a)	4.375%	2031	1,000		1,000
2032 Notes	Senior Secured Notes (b)	4.300%	2032	600		600
2034 Notes	Senior Secured Notes (a)	5.800%	2034	650		—
Term Loan Facility	Term Loan Facility	Variable	2028	—		399
Long-term debt principal				3,350		3,099
Unamortized debt discount				(1)		(2)
Unamortized debt issuance costs				(30)		(32)
Long-term debt, net				$	3,319	$	3,065

______________________________

(a) Interest payable semi-annually in arrears each June 15 and December 15. The first interest payment due on the 2034 Notes is June 15, 2025.

(b) Interest payable semi-annually in arrears each April 15 and October 15.

The following table presents scheduled debt maturities, excluding any unamortized discount on debt:

		2025		2026	2027	2028	2029 and Thereafter	Total
	(millions)
Debt maturities		$	—	—	—	—	3,350	$	3,350

Short-Term Credit Arrangements and Borrowings

The following table presents the availability under the Revolving Credit Facility:

	December 31,
	2024
	(millions)
Total availability
Revolving Credit Facility, expiring December 2029	$	1,000
Amounts outstanding
Revolving Credit Facility borrowings (a)	150
Letters of credit	16
	166
Net availability	$	834

______________________________

(a) The weighted average interest rate for Revolving Credit Facility borrowings outstanding was 4.34% as of December 31, 2024.

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DT Midstream, Inc.

Notes to Consolidated Financial Statements

Borrowings under the Revolving Credit Facility, if any, are used for general corporate purposes, acquisitions, and letter of credit issuances to support our operations and liquidity. The 2024 amendment costs of the Revolving Credit Facility of $3 million were capitalized during the year ended December 31, 2024. Revolving Credit Facility issuance and amendment costs, net of amortization, of $7 million and $6 million as of December 31, 2024 and 2023, respectively, are included in other noncurrent assets in our Consolidated Statements of Financial Position and are being amortized over the remaining term of the Revolving Credit Facility.

The Credit Agreement covering the Revolving Credit Facility includes financial covenants that we must maintain. These covenants restrict the ability of DT Midstream and our subsidiaries to incur additional indebtedness and guarantee indebtedness, create or incur liens, engage in mergers, consolidations, liquidations or dissolutions, sell, transfer or otherwise dispose of assets, make investments, acquisitions, loans or advances, pay dividends and distributions or repurchase capital stock, prepay, redeem or repurchase certain junior indebtedness, enter into agreements that limit the ability of the restricted subsidiaries to make distributions to DT Midstream or the ability of DT Midstream and our restricted subsidiaries to incur liens on assets and enter into certain transactions with affiliates. The Revolving Credit Facility requires maintenance of (i) a maximum consolidated net leverage ratio of 5 to 1 (except, that the Company may elect to temporarily step up the maximum consolidated net leverage ratio to 5.5 to 1 for a period of up to three fiscal quarters after the consummation of an acquisition or investment involving consideration exceeding $50 million), and (ii) a minimum interest coverage ratio of no less than 2.5 to 1. The consolidated net leverage ratio means the ratio of net debt determined in accordance with GAAP to annual consolidated EBITDA, as defined in the Credit Agreement. The interest coverage ratio means the ratio of annual consolidated EBITDA to annual interest expense, as defined in the Credit Agreement. The Credit Agreement definition of annual consolidated EBITDA excludes EBITDA from equity method investees, but includes dividends and distributions from equity method investees. As of December 31, 2024, the consolidated net leverage ratio and the interest coverage ratio were 2.3 to 1 and 9.3 to 1, respectively, and we were in compliance with these financial covenants.

Dividend Restrictions

The indentures governing our Senior and Senior Secured Notes permit the payment of quarterly dividends on common stock in each fiscal year up to a dividend capacity calculated as defined in the indentures. For 2024, the dividend capacity remaining at year end was $537 million.

The Credit Agreement permits the payment of quarterly dividends on common stock in each fiscal year as long as giving pro forma effect thereto, we maintain a first lien net leverage ratio that does not exceed 3.25 to 1. We maintained such first lien net leverage ratio as of December 31, 2024.

NOTE 11 — LEASES

Lessee

Our leases are primarily comprised of equipment and buildings with terms ranging from approximately 1 to 11 years.

A lease exists when we have the right to control the use of identified property, plant or equipment, as conveyed through a contract, for a certain time period and consideration paid. The right to control is deemed to occur when we have the right to obtain substantially all of the economic benefits of the identified assets and the right to direct the use of such assets.

Significant Accounting Policy – Lessee Accounting

Lease liabilities are calculated utilizing a discount rate to determine the present values of lease payments. GAAP requires the use of the rate implicit in the lease if it is readily determinable. When the rate implicit in the lease is not readily determinable, the incremental borrowing rate is used. The incremental borrowing rate is based upon the rate of interest that would have been paid on a collateralized basis over similar contract terms to that of the leases. The incremental borrowing rates have been determined utilizing an implied secured borrowing rate based upon an unsecured rate for a similar time period of remaining lease terms, which is then adjusted for the estimated impact of collateral. We have leases with non-index-based escalation clauses for fixed dollar or percentage increases over the contract term.

We have certain leases which contain purchase options. Based upon the nature of the leased property and terms of the purchase options, we have determined it is not reasonably certain that such purchase options will be exercised. Thus, the impact of the purchase options has not been included in the determination of right-of-use assets and lease liabilities for the subject leases.

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DT Midstream, Inc.

Notes to Consolidated Financial Statements

We have certain leases which contain renewal options. Where the renewal options were deemed reasonably certain to occur, the impacts of such options were included in the determination of the right-of-use assets and lease liabilities for the subject leases.

We have agreements with lease and non-lease components, which are generally accounted for separately. Consideration in a lease is allocated between lease and non-lease components based upon the estimated relative standalone prices.

The components of lease cost for the following years includes:

	Year Ended December 31,
	2024		2023		2022
	(millions)
Operating lease cost	$	21	$	20	$	20
Short-term lease cost	3		3		3
	$	24	$	23	$	23

Operating lease cost includes amortization of operating lease right-of-use assets and other related costs. We have elected not to apply the lease balance sheet recognition requirements to short-term leases with a term of 12 months or less. Operating and short-term lease costs are recorded to operation and maintenance in our Consolidated Statements of Operations.

Other relevant information related to leases for the following years includes:

	Year Ended December 31,
	2024			2023			2022
Supplemental Cash Flows Information	(millions, except years and percentages)
Cash paid for amounts included in the measurement of these liabilities:
Operating cash flows for operating leases	$	21		$	21		$	18
Right-of-use assets obtained in exchange for lease obligations:
Operating leases	$	29		$	25		$	14
Weighted Average Remaining Lease Term
Operating leases	3.9 years			4.4 years			4.0 years
Weighted Average Discount Rate
Operating leases	5.3		%	4.8		%	3.5		%

Future minimum lease payments under leases for remaining periods as of December 31, 2024 are as follows:

	Operating Leases
	(millions)
2025	$	17
2026	15
2027	14
2028	6
2029	2
2030 and thereafter	3
Total future minimum lease payments	57
Imputed interest	(5)
Lease liabilities	$	52

Lessor

A lease exists when we have provided other parties with the right to control the use of identified property, plant or equipment, as conveyed through a contract, for a certain time period and consideration received. The right to control is deemed to occur when we have provided other parties with the right to obtain substantially all of the economic benefits of the identified assets and the right to direct the use of such assets.

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DT Midstream, Inc.

Notes to Consolidated Financial Statements

We lease certain assets under an operating lease for a pipeline which commenced in December 2018. The lease is comprised of fixed payments with a remaining term of 14 years. The operating lease does not have renewal provisions or options to purchase the assets at the end of the lease and does not have termination for convenience provisions. The lease term extends to the end of the estimated economic life of the leased assets, thereby resulting in no residual value.

As part of the Midwest Pipeline Acquisition, one pipeline has agreements with a customer and its subsidiaries that results in the use of substantially all the pipeline's capacity through 2026 and represents an operating lease.

Fixed lease income associated with the operating lease was $9 million, $7 million, and $10 million for the years ended December 31, 2024, 2023 and 2022, respectively. Fixed lease income is reported in Operating revenues in our Consolidated Statements of Operations. Depreciation expense associated with the property under the operating lease was $3 million for each of the years ended December 31, 2024, 2023 and 2022.

Future minimum rental revenues for remaining periods as of December 31, 2024 are as follows:

	Operating Lease
	(millions)
2025	$	77
2026	62
2027	9
2028	9
2029	9
2030 and thereafter	79
Total future minimum rental revenues	$	245

Property under the operating lease is as follows:

	December 31,
	2024		2023
	(millions)
Gross property under operating leases	$	484	$	58
Accumulated amortization of property under operating leases	$	17	$	15

NOTE 12 — COMMITMENTS AND CONTINGENCIES

From time to time, we are subject to legal, administrative and environmental proceedings before various courts, arbitration panels and governmental agencies concerning claims arising in the ordinary course of business. These proceedings include certain contract disputes, additional environmental reviews and investigations, audits and pending judicial matters. We cannot predict the final disposition of such proceedings. We regularly review legal matters and record provisions for claims that we can estimate and are considered probable of loss. The amount or range of reasonably possible losses is not anticipated to, either individually or in the aggregate, materially adversely affect our business, financial condition and results of operations.

Guarantees

In certain limited circumstances, we enter into contractual guarantees. We may guarantee another entity's obligation in the event it fails to perform and may provide guarantees in certain indemnification agreements. We did not have any guarantees of other parties' obligations as of December 31, 2024.

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DT Midstream, Inc.

Notes to Consolidated Financial Statements

Purchase Commitments

As of December 31, 2024, we were party to long-term purchase commitments relating to a variety of goods and services required for our business. We estimate lifetime purchase commitments of approximately $95 million, due in the periods shown below.

	(millions)
2025	$	14
2026	13
2027	12
2028	12
2029	12
2030 and thereafter	32
Total	$	95

Surety Bonds

In certain limited circumstances, we enter into contracts that require us to obtain external surety bonds to secure our payment and performance. We agree to indemnify the issuers of these surety bonds for amounts, if any, paid by them under these agreements. In the event that any surety bonds are called for non-performance, we would be obligated to reimburse the issuer of the surety bond. The maximum potential indemnification under our surety bond agreements as of December 31, 2024 is $30 million.

Vector Line of Credit

We are the lender under a revolving term credit facility to Vector, the borrower, in the amount of CAD $70 million. The credit facility was executed in response to the passage of Canadian regulations requiring oil and gas pipelines to demonstrate their financial ability to respond to a catastrophic event and exists for the sole purpose of satisfying these regulations. Vector may only draw upon the facility if the funds are required to respond to a catastrophic event. The maximum potential payout as of December 31, 2024 is USD $49 million. The funding of a loan under the terms of the revolving term credit facility is considered remote.

Contingent Liability

In order to comply with certain state environmental regulations, we have an obligation to restore pipeline right-of-way slope failures that may arise in the ordinary course of business in the Utica and Marcellus formations. We completed evaluations of all locations, which were prioritized based on the severity and proximity of the slope failures, and used updated cost information to assess the adequacy of the estimate for the contingent liability accrual. Based on these evaluations, we recorded a reduction to the contingent liability accrual and decrease to operation and maintenance expense of $9 million and $6 million during the years ended December 31, 2024 and 2023, respectively. As of December 31, 2024 and 2023, we had accrued contingent liabilities of $3 million and $13 million, respectively, for future slope restoration expenditures. The accrual is included in other current liabilities and other liabilities in the Consolidated Statements of Financial Position. While restoration is ongoing, we believe the accrued amounts are sufficient to cover estimated future expenditures.

NOTE 13 — STOCK-BASED COMPENSATION AND DEFINED CONTRIBUTION PLANS

The DT Midstream, Inc. Long-Term Incentive Plan permits the grant of incentive and nonqualified stock options, stock appreciation rights, restricted stock awards and restricted stock units, performance share awards, and performance units to employees, consultants and members of DT Midstream's Board of Directors. As a result of a restricted stock award grant, restricted stock unit or performance share award settlement, or by exercise of a stock option, we may issue common stock from our authorized but unissued common stock and/or from outstanding common stock acquired by or on behalf of DT Midstream in the participant's name. Key provisions of the DT Midstream Plan are:

•Authorized limit as of December 31, 2024 was 8,250,000 shares of common stock. The authorized limit increases annually on January 1 by the lesser of 1,750,000 shares of common stock or the amount determined by the DT Midstream Board of Directors.

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DT Midstream, Inc.

Notes to Consolidated Financial Statements

•Prohibits the grant of a stock option with an exercise price that is less than the fair market value of DT Midstream's stock on the grant date.

The following table summarizes our stock-based compensation expense and the related income tax benefit:

	Year Ended December 31,
	2024		2023		2022
	(millions)
Stock-based compensation expense	$	23	$	20	$	17
Tax benefit	$	5	$	5	$	4

Restricted Stock Units

Restricted stock units granted under the DT Midstream Plan are for a specified number of shares of DT Midstream common stock that entitle the holder to receive common stock, a cash payment, or a combination thereof at the end of the specified vesting period, which is generally three or four years. Restricted stock units are deemed to be equity awards. The fair value of restricted stock units is based on DT Midstream's closing common stock price on the grant date. The fair value is amortized to stock-based compensation expense using a graded vesting schedule over the vesting period. Restricted stock units are settled with DT Midstream common stock and fractional shares are settled in cash.

During the vesting period, the number of restricted stock units granted will increase, assuming full dividend reinvestment on each dividend payment date. The recipient of a restricted stock unit has no shareholder rights during the vesting period. Restricted stock units are nontransferable and subject to risk of forfeiture during the vesting period. Forfeitures are recognized in the period they occur.

The following table summarizes restricted stock unit activity for the year ended December 31, 2024:

	Restricted Stock Units	Weighted- Average Grant Date Fair Value
	(thousands)	(per share)
Nonvested as of December 31, 2023	417	$	45.82
Granted (a)	152	60.37
Forfeited	(4)	49.35
Vested (b)	(104)	42.40
Nonvested as of December 31, 2024	461	$	51.37

____________________________________

(a)Includes initial grants and dividends reinvested.

(b)Includes vested, not issued shares of two thousand at December 31, 2024. Shares will be issued in first quarter 2025.

The weighted-average grant date fair value of restricted stock units granted, excluding dividends reinvested, during the years ended December 31, 2024, 2023 and 2022 was $62.63, $52.66 and $52.25, respectively. The intrinsic value of restricted stock units vested and issued during the years ended December 31, 2024, 2023 and 2022 was $7 million, $8 million, and $3 million, respectively.

Performance Share Awards

Performance share awards granted under the DT Midstream Plan are for a specified number of shares of DT Midstream common stock that entitle the holder to receive common stock, a cash payment, or a combination thereof at the end of the specified vesting period, which is generally three years. Performance share awards are deemed to be equity awards. Performance share stock-based compensation expense is accrued over the vesting period based on the grant date fair value calculated using: (i) DT Midstream's closing common stock price on the grant date; (ii) the grant date fair value of the market condition; and (iii) the probable achievement of performance objectives. The number of shares issued at settlement is determined based on market conditions and the achievement of certain DT Midstream performance objectives. Performance share awards are settled with DT Midstream common stock and fractional shares are settled in cash.

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DT Midstream, Inc.

Notes to Consolidated Financial Statements

During the vesting period, the number of performance share awards granted will increase, assuming full dividend reinvestment on each dividend payment date. The recipient of a performance share award has no shareholder rights during the vesting period. Performance share awards are nontransferable and are subject to risk of forfeiture during the vesting period. Forfeitures are recognized in the period they occur.

The following table summarizes performance share award activity for the year ended December 31, 2024:

	Performance Share Awards	Weighted- Average Grant Date Fair Value
	(thousands)	(per share)
Nonvested as of December 31, 2023	557	$	64.36
Granted (a)	372	55.32
Forfeited	(29)	59.66
Settled	(199)	48.12
Nonvested as of December 31, 2024	701	$	64.38

_____________________________________

(a)Includes initial grants, dividends reinvested and shares added for achievement of final performance objectives on settled awards.

The weighted-average grant date fair value of performance share awards granted, excluding dividends reinvested, during the years ended December 31, 2024, 2023 and 2022 was $52.05, $53.74 and $72.91, respectively. The intrinsic value of performance share awards settled during the years ended December 31, 2024, 2023 and 2022 was $10 million, $9 million and $4 million, respectively.

Unrecognized Compensation Costs

As of December 31, 2024, we had $27 million of total unrecognized compensation costs related to non-vested stock incentive plan arrangements. The unrecognized compensation cost is expected to be recognized over a weighted-average period of 1.77 years.

Defined Contribution Plans

We sponsor defined contribution retirement savings plans, and participation in one of these plans is available to substantially all employees. We match employee contributions up to certain predefined and Internal Revenue Service limits based on eligible compensation and each employee's contribution rate, and contribute additional amounts in lieu of traditional pension and post-employment healthcare benefits. DT Midstream's cost for these plans was $7 million, $7 million and $5 million for the years ended December 31, 2024, 2023 and 2022, respectively.

NOTE 14 — SEGMENT AND RELATED INFORMATION

We set strategic goals, allocate resources, and evaluate performance based on the following two segments: Pipeline and Gathering. Our Chief Operating Decision Maker (CODM) has been identified as our Chief Executive Officer. Our CODM regularly evaluates financial information regarding these segments in deciding how to allocate resources and in assessing our operating and financial performance. We manage and report our operations primarily according to the nature of our products and services. Our plants, pipelines and other fixed assets are located in the U.S. and Canada.

The Pipeline segment owns and operates interstate and intrastate natural gas pipelines, storage systems, and natural gas gathering lateral pipelines. The Pipeline segment also has interests in equity method investees that own and operate interstate natural gas pipelines. The segment is engaged in the transportation and storage of natural gas for intermediate and end user customers. The Midwest Pipeline Acquisition assets are presented in our Pipeline segment as of December 31, 2024. During the three months ended March 31, 2023, we completed the conversion of the Michigan System from gathering to dry gas transmission service and began providing services under a new long-term dry gas transmission contract. For the years ended December 31, 2024 and 2023, the Michigan System financial results are presented in the Pipeline segment. The 2022 comparative activity was for gathering services and therefore was not revised from presentation in the Gathering segment.

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DT Midstream, Inc.

Notes to Consolidated Financial Statements

The Gathering segment owns and operates gas gathering systems. The segment is engaged in collecting natural gas from points at or near customers’ wells for delivery to plants for treating, to gathering pipelines for further gathering, or to pipelines for transportation, as well as associated ancillary services, including compression, dehydration, gas treatment, water impoundment, water transportation, water disposal, and sand mining. The Clean Fuels Gathering assets and results of operations after the July 1, 2024 acquisition date are presented in our Gathering segment.

Our CODM uses Net Income Attributable to DT Midstream to allocate resources, including employees, property, and financial or capital resources, for each segment predominantly in the annual budget and forecasting process. Our CODM considers budget-to-actual variances on a monthly basis when making decisions about allocating capital and personnel to the segments. The CODM also uses Net Income Attributable to DT Midstream to assess the performance for each segment by comparing the results of each segment. Net Income Attributable to DT Midstream is an important performance measure of the core profitability of our operations and forms the basis of our internal and external financial reporting. We believe that investors benefit from having access to the same financial measures that our management uses in evaluating segment results.

Inter-segment billing for goods and services exchanged between segments is based upon contracted prices of the provider. Inter-segment billings were not significant for the years ended December 31, 2024, 2023 and 2022.

Financial data for our business segments follows:

	Year Ended December 31, 2024
	Pipeline		Gathering		Total Reportable Segments		Eliminations		Total Consolidated
	(millions)
Revenues
Operating revenues	$	443	$	538	$	981	$	—	$	981
Operating Expenses
Operation and maintenance	68		176		244		—		244
Depreciation and amortization	74		135		209		—		209
Taxes other than income	22		17		39		—		39
Other (Income) and Deductions
Interest expense	47		106		153		—		153
Interest income	(4)		(3)		(7)		—		(7)
Earnings from equity method investees	(162)		—		(162)		—		(162)
Loss from financing activities	3		2		5		—		5
Other income	(1)		(3)		(4)		—		(4)
Income Tax Expense	107		30		137		—		137
Less: Net Income Attributable to Noncontrolling Interests	13		—		13		—		13
Net Income Attributable to DT Midstream	$	276	$	78	$	354	$	—	$	354
Capital expenditures	$	73	$	277	$	350	$	—	$	350
Acquisition accounted for as a business combination	$	1,198	$	—	$	1,198	$	—	$	1,198
	December 31, 2024
Investments in equity method investees	$	1,297	$	—	$	1,297	$	—	$	1,297
Goodwill	356		420		776		—		776
Total Assets	$	5,274	$	4,661	$	9,935	$	—	$	9,935

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DT Midstream, Inc.

Notes to Consolidated Financial Statements

	Year Ended December 31, 2023
	Pipeline		Gathering		Total Reportable Segments		Eliminations		Total Consolidated
	(millions)
Revenues
Operating revenues	$	377	$	545	$	922	$	—	$	922
Operating Expenses
Operation and maintenance	55		190		245		—		245
Depreciation and amortization	69		113		182		—		182
Taxes other than income	15		13		28		—		28
Asset (gains) losses and impairments, net	(4)		—		(4)		—		(4)
Other (Income) and Deductions
Interest expense	55		95		150		—		150
Interest income	(1)		—		(1)		—		(1)
Earnings from equity method investees	(177)		—		(177)		—		(177)
Other income	—		(1)		(1)		—		(1)
Income Tax Expense	75		29		104		—		104
Less: Net Income Attributable to Noncontrolling Interests	12		—		12		—		12
Net Income Attributable to DT Midstream	$	278	$	106	$	384	$	—	$	384
Capital expenditures	$	255	$	517	$	772	$	—	$	772
	December 31, 2023
Investments in equity method investees	$	1,762	$	—	$	1,762	$	—	$	1,762
Goodwill	53		420		473		—		473
Total Assets	$	4,439	$	4,543	$	8,982	$	—	$	8,982

	Year Ended December 31, 2022
	Pipeline		Gathering		Total Reportable Segments		Eliminations		Total Consolidated
	(millions)
Revenues
Operating revenues	$	339	$	581	$	920	$	—	$	920
Operating Expenses
Operation and maintenance	54		213		267		—		267
Depreciation and amortization	63		107		170		—		170
Taxes other than income	14		14		28		—		28
Asset (gains) losses and impairments, net	(6)		(17)		(23)		—		(23)
Other (Income) and Deductions
Interest expense	57		80		137		—		137
Interest income	(1)		(2)		(3)		—		(3)
Earnings from equity method investees	(150)		—		(150)		—		(150)
Loss from financing activities	6		7		13		—		13
Other income	—		(1)		(1)		—		(1)
Income Tax Expense	62		38		100		—		100
Less: Net Income Attributable to Noncontrolling Interests	12		—		12		—		12
Net Income Attributable to DT Midstream	$	228	$	142	$	370	$	—	$	370
Capital expenditures and acquisitions	$	638	$	252	$	890	$	—	$	890
	December 31, 2022
Investments in equity method investees	$	2,200	$	—	$	2,200	$	—	$	2,200
Goodwill	53		420		473		—		473
Total Assets	$	4,625	$	4,208	$	8,833	$	—	$	8,833

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DT Midstream, Inc.

Notes to Consolidated Financial Statements

NOTE 15 — RELATED PARTY TRANSACTIONS

Transactions between DT Midstream and our equity method investees have been presented as related party transactions in the accompanying Consolidated Financial Statements.

The following is a summary of our balances with related parties:

	December 31,
	2024		2023
	(millions)
Notes receivable from Vector — long-term	$	4	$	4
Current Liabilities — Other	$	1	$	1

DT Midstream had related party transactions presented in Operation and maintenance and Other expense in our Consolidated Statements of Operations during the years ended December 31, 2024, 2023 and 2022 of $2 million, $1 million and $1 million, respectively.

NOTE 16 — ACQUISITIONS

Clean Fuels Acquisition

On July 1, 2024, DT Midstream closed on the purchase of Clean Fuels Gathering from a privately held coal mine methane producer for purchase consideration of $12 million plus immaterial transaction costs, which was accounted for as an asset acquisition. The Clean Fuels Acquisition was primarily comprised of gathering and treating assets that process coal mine methane into pipeline quality gas which was capitalized as property, plant and equipment. The Clean Fuels Acquisition aligns with our strategy to pursue economically attractive opportunities and deploy GHG reducing technologies and is expected to generate carbon offsets and federal income tax credits. A concurrent gas supply agreement was executed which requires contingent payments from DT Midstream of up to $34 million upon the completion of certain milestones, including cumulative production and income tax credits, and variable payments under a sharing mechanism that could be material. As of December 31, 2024, one milestone had been achieved and $10 million was recorded as a long-term prepaid asset in Other assets and Accounts payable in DT Midstream's Consolidated Statements of Financial Position. The Clean Fuels Gathering assets and results of operations after the July 1, 2024 acquisition date are presented in our Gathering segment.

Midwest Pipeline Acquisition

On December 31, 2024, we closed on the Midwest Pipeline Acquisition of three FERC-regulated natural gas transmission pipelines from ONEOK for a purchase price of $1.2 billion, which is subject to certain customary purchase price adjustments. Under the terms of the agreement, DT Midstream acquired 100% operating ownership in Guardian, Midwestern and Viking. The pipelines have a total capacity of approximately 3.7 Bcf/d and 1,300 miles across seven states in the Midwest market region.

•Guardian Pipeline, L.L.C. is a 263-mile interstate pipeline which connects to the Chicago Hub and serves key Wisconsin demand centers;

•Midwestern Gas Transmission Company is a 402-mile bi-directional interstate pipeline which connects Appalachia supply to the Midwest market region between Tennessee and the Chicago Hub; and

•Viking Gas Transmission Company is a 674-mile bi-directional interstate pipeline which serves key utility customers in Minnesota, Wisconsin and North Dakota.

The Midwest Pipeline Acquisition has potential commercial synergies and it directly aligns with DT Midstream's strategy of owning natural gas assets serving key demand centers and market regions, and with revenues supported by take-or-pay contracts with creditworthy and diverse customers.

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DT Midstream, Inc.

Notes to Consolidated Financial Statements

The cash consideration provided for the assets acquired was approximately $1.2 billion. The acquisition was accounted for using the acquisition method of accounting for business combinations. Assets acquired and liabilities assumed were measured at estimated fair value at the acquisition date. The FERC-regulated pipelines are subject to rate making and cost recovery provisions and are accounted for under ASC 980 guidance as discussed in Note 17, "Regulatory Matters" to the Consolidated Financial Statements. As such, the fair value of assets acquired and liabilities assumed subject to these provisions approximates their regulated basis, and therefore no fair value adjustments have been reflected related to these amounts.

The intangible assets recorded as a result of the acquisition pertain to existing customer relationships, which were valued at approximately $11 million as of the acquisition date. This fair value was estimated by applying the multi-period excess earnings method, which estimates the value of the intangible asset based upon the present value of the incremental after-tax cash flows solely attributable to the existing customer relationships. The fair value measurement uses significant unobservable inputs, including management estimates and assumptions, and thus represents a fair value Level 3 measurement, pursuant to the applicable accounting guidance. Key estimates and inputs include revenue and expense projections and discount rates based on the risks associated with the intangible assets, and contributory asset charges. The intangible assets are amortized on a straight-line basis over a period of 5 years, which is the number of years the assets are expected to generate incremental after-tax cash flows.

The excess purchase price over the fair value of net assets acquired and liabilities assumed was classified as goodwill. The factors contributing to the recognition of goodwill were based on various strategic benefits that are expected to be realized from the acquisition. The acquisition provides us with a platform for growth and access to further investment opportunities.

For income tax purposes, the transaction is treated as a taxable deemed asset acquisition. Accordingly, the majority of deferred income tax assets and liabilities of the acquired entities are eliminated as the tax bases were increased to fair market value which equals net book value. See Note 7, "Income Taxes" to the Consolidated Financial Statements.

The preliminary allocation of the purchase price is based on estimated fair values of the assets acquired and liabilities assumed at the date of acquisition, December 31, 2024. The purchase price is subject to final working capital settlement adjustments and other potential valuation adjustments during the one year measurement period per the business combination guidance. The components of the preliminary purchase price allocation are as follows:

		December 31,
		2024
		(millions)
Assets
	Accounts receivable	$	29
	Other current assets	10
	Property, plant, and equipment, net	933
	Goodwill	303
	Customer relationship intangible assets	11
	Regulatory assets	10
	Other assets	22
		$	1,318
Liabilities
	Accounts payable	$	12
	Property taxes payable	5
	Other current liabilities	3
	Regulatory liabilities	90
	Other liabilities	10
		$	120
Total cash consideration		$	1,198

90

DT Midstream, Inc.

Notes to Consolidated Financial Statements

DT Midstream incurred approximately $5 million of direct transaction costs for the acquisition during the year ended December 31, 2024. These costs were primarily related to legal and advisory fees and are included in operation and maintenance in DT Midstream's Consolidated Statements of Operations. The Midwest Pipeline Acquisition assets are presented in our Pipeline segment as of December 31, 2024.

Pro forma Financial Information

The Midwest Pipeline Acquisition was completed on December 31, 2024, therefore the acquisition had no impact on our consolidated revenues and earnings for the twelve months ended December 31, 2024. The following unaudited pro forma summary presents our consolidated information as if the acquisition had occurred on January 1, 2023 using our records and seller provided information. The unaudited pro forma financial information does not purport to be indicative of the combined results of operations which would have actually been obtained had the acquisition taken place on January 1, 2023, nor should it be taken as indicative of future consolidated results of operations. The pro forma earnings for the years ended December 31, 2024 and 2023 were adjusted to include net interest expense, after tax, of $11 million and $23 million, respectively, related to the 2034 Senior Notes issued to fund the acquisition offset by the elimination of interest expense on debt held by the acquired pipelines, which was paid off at the acquisition date. Income tax expense of $22 million related to the remeasurement of state deferred income taxes as a result of the acquisition were excluded from the year ended December 31, 2024 and included in the year ended December 31, 2023. Transaction costs, after tax, of $7 million, which includes Bridge Financing fees and legal and professional expenses, were excluded from the year ended December 31, 2024 and included in the year ended December 31, 2023. Other adjustments, after tax, of $1 million and $4 million were included for the years ended December 31, 2024 and 2023, respectively.

	Pro forma (Unaudited)
	Years Ended December 31,
	2024		2023
	(in millions)
Revenue	$	1,182	$	1,091
Net Income attributable to DT Midstream	$	430	$	377

NOTE 17 — REGULATORY MATTERS

Significant Accounting Policy – Regulation

Guardian, Midwestern and Viking are subject to rate regulation and accounting requirements of the FERC. The regulated operations of each of these subsidiaries have rates that are (i) established by independent, third-party regulators, (ii) set at levels that will recover our costs when considering the demand and competition for our services and (iii) collectible from our customers. Accordingly, we follow the accounting for regulated operations as defined in ASC 980, Regulated Operations for these pipelines, which results in differences in the application of GAAP between our regulated and non-regulated businesses. During the rate-making process, FERC sets the framework for what we can charge to and collect from our 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. Examples include costs for fuel and losses, contributions in aid of construction, charges for depreciation, gains or losses on disposition of assets and deferral of tax benefits related to changes in tax rates.

Regulatory Assets and Liabilities

Under ASC 980, our regulated operations are required to record regulatory assets and liabilities for certain transactions that would have been treated as revenue or expense in non-regulated businesses. Future regulatory changes could result in changes in the amounts of regulatory assets and liabilities or the discontinuance of this accounting treatment for regulatory assets and liabilities and may require the write-off of the portion of any regulatory asset or liability that is no longer probable of recovery through regulated rates. Actions by regulatory authorities could also have an effect on the amounts we charge to and collect from our customers. Any difference in the amounts recoverable or deferred is recorded as income or expense at the time of regulatory action.

91

DT Midstream, Inc.

Notes to Consolidated Financial Statements

Continued applicability of regulatory accounting treatment requires that rates be designed to recover specific costs of providing regulated services and be charged to and collected from customers. We believe that currently available facts support the continued use of regulatory accounting and that all regulatory assets and liabilities are recoverable or refundable in the current regulatory environment. Regulatory assets are included in Other Assets – Other on our Consolidated Statement of Financial Position.

The following includes balances and descriptions of our regulatory assets and liabilities.

	December 31,
	2024
	(millions)
Regulatory Assets
Recoverable income taxes related to AFUDC equity	$	7
Load Management Services Cost Recovery Mechanism	2
Other regulatory assets	1
	$	10
Regulatory Liabilities
Refundable federal income taxes	$	79
Removal costs liability	11
	$	90

As noted below, certain Regulatory assets for which costs have been incurred were included (or are expected to be included, for costs incurred subsequent to the most recently approved rate case) in the rate base, thereby providing a return on invested costs (except as noted). Certain other Regulatory assets are not included in the rate base but accrue recoverable carrying charges until tariff rates adjusted to collect the assets are billed. Certain Regulatory assets do not result from cash expenditures and therefore do not represent investments included in rate base or have offsetting liabilities that reduce rate base.

Regulatory Assets

•Recoverable income taxes related to AFUDC equity - Accounting standards for income taxes require recognition of a deferred tax liability for the equity component of AFUDC. A Regulatory asset is required for the future increase in taxes payable related to the equity component of AFUDC that will be recovered from customers through future rates over the remaining life of the related property, plant and equipment.

•Load Management Services Cost Recovery Mechanism - The mechanism reconciles the differences between the cost to our pipelines to maintain their line pack gas and the amounts our pipelines receive or pay for such gas to resolve imbalances with customers and pipeline interconnects and as may be otherwise necessary to maintain an appropriate level of line pack for system management purposes. The balance is recovered through an annual update to the LMS tariff rate applied to daily imbalance volumes with counterparties. The recoverable amount is not earning a return or accruing carrying charges.

Liabilities

•Refundable federal income taxes - In December 2017, the Tax Cuts and Jobs Acts ("TCJA") was enacted and reduced the corporate income tax rate, effective January 1, 2018. Guardian, Midwestern and Viking remeasured deferred taxes, resulting in a reduction to deferred tax liabilities, to reflect the impact of the TCJA on the cumulative temporary differences expected to reverse after the effective date. Regulatory liabilities were established for the anticipated return to ratepayers of deferred income taxes through reductions in future rates. The current amount of amortization and method for amortization of each pipeline’s Regulatory liability related to the TCJA tax rate change has been determined in each pipeline’s most recent rate proceedings.

•Removal costs liability - The amounts collected from customers to fund future asset removal activities in excess of removal costs incurred. The annual amount accumulated in this liability is based on rates established in the most recent rate proceedings for each pipeline. The rate is multiplied by the depreciable base for each applicable asset category to calculate the annual amount accumulated in this liability.

92

DT Midstream, Inc.

Notes to Consolidated Financial Statements

Rate Case Settlements

The settlement dates for the most recent FERC rate proceedings for Guardian, Midwestern and Viking were February 15, 2023, May 3, 2022 and July 31, 2024, respectively. As of December 31, 2024, there were no open FERC proceedings for these pipelines.

NOTE 18 — SUBSEQUENT EVENT

Dividend Declaration

On February 26, 2025, we announced that our Board of Directors declared a quarterly dividend of $0.82 per share of common stock. The dividend is payable to our stockholders of record as of March 17, 2025 and is expected to be paid on April 15, 2025.

93

Item 9. Changes in and Disagreements with Accountants on Accounting and Financial Disclosure

None.

Item 9A. Controls and Procedures

(a) Evaluation of disclosure controls and procedures

Management of DT Midstream carried out an evaluation, under the supervision and with the participation of DT Midstream's Chief Executive Officer (CEO) and Chief Financial Officer (CFO), of the effectiveness of the design and operation of DT Midstream's disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) as of December 31, 2024, which is the end of the period covered by this report. Based on this evaluation, DT Midstream's CEO and CFO have concluded that such disclosure controls and procedures are effective in providing reasonable assurance that information required to be disclosed by DT Midstream in reports that it files or submits under the Exchange Act (i) is recorded, processed, summarized, and reported within the time periods specified in the SEC's rules and forms and (ii) is accumulated and communicated to DT Midstream's management, including our CEO and CFO, as appropriate to allow timely decisions regarding required disclosure. Due to the inherent limitations in the effectiveness of any disclosure controls and procedures, management cannot provide absolute assurance that the objectives of our disclosure controls and procedures will be attained.

(b) Management's report on internal control over financial reporting

Management of DT Midstream is responsible for establishing and maintaining adequate internal control over financial reporting as such term is defined in Exchange Act Rules 13a-15(f) and 15d-15(f). Internal control over financial reporting is a process designed by, or under the supervision of, DT Midstream's CEO and CFO, 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.

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.

Management of DT Midstream has assessed the effectiveness of DT Midstream’s internal control over financial reporting as of December 31, 2024. In making this assessment, management used the criteria issued by the Committee of Sponsoring Organizations of the Treadway Commission in Internal Control - Integrated Framework (2013). Based on this assessment, DT Midstream's management concluded that, as of December 31, 2024, DT Midstream’s internal control over financial reporting was effective.

Management has excluded the Midwest Pipeline Acquisition of three FERC-regulated natural gas transmission pipelines from its assessment of internal control over financial reporting as of December 31, 2024 because they were acquired by DT Midstream in a purchase business combination on December 31, 2024. The acquired wholly-owned subsidiaries from the Midwest Pipeline Acquisition represent less than 1 percent of DT Midstream's consolidated total revenue for the year ended December 31, 2024 and approximately 10 percent of DT Midstream's consolidated total assets (the 10 percent calculation excludes assets related to acquired goodwill and other intangible assets, as they were included in management’s assessment), as of December 31, 2024.

The effectiveness of DT Midstream's internal control over financial reporting as of December 31, 2024 has been audited by PricewaterhouseCoopers, LLP, an independent registered public accounting firm, as stated in their report which appears herein.

(c) 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, 2024 that materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

94

Item 9B. Other Information

During the three months ended December 31, 2024, none of the Company’s directors or executive officers adopted, modified or terminated any contract, instruction or written plan for the purchase or sale of the Company’s common stock that was intended to satisfy the affirmative defense conditions of Exchange Act Rule 10b5-1(c) or any "non-Rule 10b5-1 trading arrangement."

Item 9C. Disclosure Regarding Foreign Jurisdictions that Prevent Inspections

Not applicable.

PART III

Information required of DT Midstream by Part III (Items 10, 11, 12, 13 and 14) of this Form 10-K is incorporated by reference from DT Midstream's definitive Proxy Statement for our 2025 Annual Meeting of Common Shareholders to be held May 6, 2025. The Proxy Statement will be filed with the SEC pursuant to Regulation 14A not later than 120 days after the end of DT Midstream's fiscal year covered by this report on Form 10-K, all of which information is hereby incorporated by reference in, and made part of, this Form 10-K.

Item 10. Directors, Executive Officers, and Corporate Governance

Item 11. Executive Compensation

Item 12. Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters

Item 13. Certain Relationships and Related Transactions, and Director Independence

Item 14. Principal Accountant Fees and Services

95

PART IV

Item 15. Exhibits and Financial Statement Schedules

A.The following documents are filed as part of this Annual Report on Form 10-K.

(a)Consolidated Financial Statements. See "Item 8—Financial Statements."

(b)Financial Statement Schedules. Financial statement schedules listed under the SEC rules are omitted because they are not applicable, or the required information is provided in the Notes to Consolidated Financial Statements in Item 8 of this Form 10-K.

(c)Exhibits.

Exhibit Number	Description
	(i) Exhibits filed herewith:
4.1	First Supplemental Indenture, dated as of January 30, 2025, among DT Midstream, Inc., the Guaranteeing Subsidiaries and U.S. Bank Trust Company, National Association, as trustee
4.2	Second Supplemental Indenture, dated as of January 30, 2025, among DT Midstream, Inc., the Guaranteeing Subsidiaries and U.S. Bank Trust Company, National Association, as trustee and Notes Collateral Agent
4.3	First Supplemental Indenture, dated as of January 30, 2025, among DT Midstream, Inc., the Guaranteeing Subsidiaries and U.S. Bank Trust Company, National Association, as trustee and Notes Collateral Agent
21.1	Subsidiaries of DT Midstream, Inc.
23.1	Consent of PricewaterhouseCoopers LLP
31.1	Chief Executive Officer Section 302 Form 10-K Certification of Periodic Report
31.2	Chief Financial Officer Section 302 Form 10-K Certification of Periodic Report
95.1	Mine Safety Disclosure
101.INS	XBRL Instance Document - The instance document does not appear in the Interactive Data File because its XBRL tags are embedded within the Inline XBRL document
101.SCH	XBRL Taxonomy Extension Schema
101.CAL	XBRL Taxonomy Extension Calculation Linkbase
101.DEF	XBRL Taxonomy Extension Definition Database
101.LAB	XBRL Taxonomy Extension Label Linkbase
101.PRE	XBRL Taxonomy Extension Presentation Linkbase
104	Cover Page Interactive Data File (formatted as Inline XBRL and contained in Exhibit 101)
	(ii) Exhibits furnished herewith:
32.1	Chief Executive Officer Section 906 Form 10-K Certification of Periodic Report
32.2	Chief Financial Officer Section 906 Form 10-K Certification of Periodic Report
	(iii) Exhibits incorporated by reference:
2.1	Separation and Distribution Agreement, dated June 25, 2021, between DTE Energy Company and DT Midstream, Inc. (incorporated by reference to Exhibit 2.1 to DT Midstream’s Current Report on Form 8-K filed on July 1, 2021)
3.1	Amended and Restated Certificate of Incorporation of DT Midstream, Inc., effective July 1, 2021 (incorporated by reference to Exhibit 3.1 to DT Midstream's Current Report on Form 8-K filed on July 1, 2021)
3.2	Amended and Restated Bylaws of DT Midstream, Inc., effective July 1, 2021 (incorporated by reference to Exhibit 3.2 to DT Midstream's Current Report on Form 8-K filed on July 1, 2021)

96

Exhibit Number	Description
	(iii) Exhibits incorporated by reference:
4.4	Description of Securities (incorporated by reference to Exhibit 4.1 to DT Midstream's Annual Report on Form 10-K filed on February 16, 2024)
4.5	Indenture dated as of June 9, 2021 among DT Midstream, the Guarantors and U.S. Bank National Association, as trustee (incorporated by reference to Exhibit 4.1 to DT Midstream's Current Report on Form 8-K filed on June 10, 2021)
4.6	Indenture, dated as of April 11, 2022, among DT Midstream, Inc., the Guarantors and U.S. Bank Trust Company, National Association, as trustee (incorporated by reference to Exhibit 4.1 to DT Midstream's Current Report on Form 8-K filed April 11, 2022)
4.7	Pari Passu Intercreditor Agreement, dated as of April 11, 2022, among DT Midstream, Inc., the Guarantors, Barclays Bank PLC, as Credit Agreement Agent, and U.S. Bank Trust Company, National Association, as Notes Collateral Agent (incorporated by reference to Exhibit 4.2 to DT Midstream's Current Report on Form 8-K filed April 11, 2022)
4.8	First Supplemental Indenture, dated as of August 12, 2024, among DT Midstream, Inc., the Guarantors and U.S. Bank Trust Company, National Association, as Trustee and Notes Collateral Agent (incorporated by reference to Exhibit 4.4 to DT Midstream's Quarterly Report on Form 10-Q filed on October 29, 2024)
4.9	Indenture, dated as of December 6, 2024, among DT Midstream, Inc., the Guarantors and U.S. Bank Trust Company, National Association, as Trustee and Notes Collateral Agent (incorporated by reference to Exhibit 4.1 to DT Midstream's Current Report on Form 8-K filed on December 6, 2024)
10.1*	Form of Amended and Restated Change-In-Control Severance Agreement (incorporated by reference to Exhibit 10.1 to DT Midstream's Annual Report on Form 10-K filed on February 16, 2024)
10.2	Credit Agreement, dated as of June 10, 2021 by and among DT Midstream, as borrower, the Lenders party thereto, the L/C Issuers party thereto, and Barclays Bank PLC, as Administrative Agent and Collateral Agent (incorporated by reference to Exhibit 10.1 to DT Midstream's Current Report on Form 8-K filed on June 10, 2021)
10.3	Tax Matters Agreement, dated June 25, 2021, between DTE Energy Company and DT Midstream, Inc. (incorporated by reference to Exhibit 10.2 to DT Midstream’s Current Report on Form 8-K filed on July 1, 2021)
10.4	DT Midstream, Inc. Long-Term Incentive Plan (incorporated by reference to Exhibit 10.4 to DT Midstream’s Registration Statement on Form 10-12B (File No. 001-40392), filed on May 7, 2021)
10.5	DT Midstream, Inc. Supplemental Savings Plan (incorporated by reference to Exhibit 10.1 to DT Midstream’s Annual Report on Form 10-K filed on February 16, 2023)
10.6	Form of Severance Agreement (incorporated by reference to Exhibit 10.5 to DT Midstream’s Current Report on Form 8-K filed on July 1, 2021)
10.7	DT Midstream, Inc. Annual Incentive Plan (incorporated by reference to Exhibit 10.6 to DT Midstream’s Current Report on Form 8-K filed on July 1, 2021)
10.8	First Incremental Revolving Facility Amendment and Amendment No. 1 to Credit Agreement and Collateral Agreement, by and among DT Midstream, Inc., the lenders and letter of credit issuers party thereto and Barclays Bank PLC, as administrative agent and collateral agent, dated as of October 19, 2022 (incorporated by reference to Exhibit 10.1 to DT Midstream's Current Report on Form 8-K filed on October 20, 2022)
10.9	Amendment No. 2 to Credit Agreement, by and between DT Midstream, Inc., and Barclays Bank PLC, as administrative agent and collateral agent, dated as of June 27, 2023 (incorporated by reference to Exhibit 10.1 to DT Midstream's Current Report on Form 8-K filed on June 29, 2023)

97

Exhibit Number	Description
	(iii) Exhibits incorporated by reference:
10.10	Amendment No. 3 to Credit Agreement, by and between DT Midstream, Inc., and Barclays Bank PLC, as administrative agent and collateral agent, and the lenders party thereto, dated as of November 25, 2024 (incorporated by reference to Exhibit 10.1 to DT Midstream's Current Report on Form 8-K filed on November 27, 2024)
10.11	Amendment No. 4 to Credit Agreement, by and between DT Midstream, Inc., the guarantors party thereto and Barclays Bank PLC, as administrative agent and collateral agent, dated as of December 12, 2024 (incorporated by reference to Exhibit 10.1 to DT Midstream's Current Report on Form 8-K filed on December 12, 2024)
10.12	Purchase and Sale Agreement, dated November 19, 2024, by and among DT Midstream, Inc., DTM Interstate Transportation, LLC, ONEOK Partners Intermediate Limited Partnership and Border Midwestern Company (incorporated by reference to Exhibit 10.1 to DT Midstream’s Current Report on Form 8-K filed on November 19, 2024)
19.1	DT Midstream, Inc. Insider Trading Policy, dated June 1, 2023 (incorporated by reference to Exhibit 19.1 to DT Midstream’s Annual Report on Form 10-K filed on February 16, 2024)
97.1	DT Midstream, Inc. Clawback Policy, dated September 19, 2023 (incorporated by reference to Exhibit 97.1 to DT Midstream’s Annual Report on Form 10-K filed on February 16, 2024)

* Certain portions of this exhibit have been redacted pursuant to Item 601(b)(10)(iv) of Regulation S-K. The registrant agrees to furnish supplementally an unredacted copy of the exhibit to the Securities and Exchange Commission upon its request

Item 16. Form 10-K Summary

None.

98

Signatures

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, DT Midstream, Inc. has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

Date:	February 26, 2025
			DT MIDSTREAM, INC.
			(Registrant)
		By:	/S/ DAVID J. SLATER
			David J. Slater President and Chief Executive Officer of DT Midstream, Inc.

Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below by the following persons on behalf of DT Midstream, Inc. and in the capacities and on the date indicated.

By:	/S/  DAVID J. SLATER	By:	/S/  JEFFREY A. JEWELL
	David J. Slater President, Chief Executive Officer, and Director (Principal Executive Officer)		Jeffrey A. Jewell Executive Vice President, Chief Financial and Accounting Officer (Principal Financial and Accounting Officer)
By:	/S/ ROBERT C. SKAGGS, JR.	By:	/S/  ANGELA ARCHON
	Robert C. Skaggs, Jr.		Angela Archon, Director
	Chairman of the Board, and Director
By:	/S/  STEPHEN BAKER	By:	/S/  ELAINE PICKLE
	Stephen Baker, Director		Elaine Pickle, Director
By:	/S/  PETER TUMMINELLO	By:	/S/ DWAYNE WILSON
	Peter Tumminello, Director		Dwayne Wilson, Director

Date: February 26, 2025

99

EX-4.1

Exhibit 4.1

First Supplemental Indenture (this “Supplemental Indenture”), dated as of January 30, 2025, among DT Midstream, Inc. (the “Issuer”), Guardian Pipeline, L.L.C. (“Guardian”), Midwestern Gas Transmission Company (“Midwestern”), Viking Gas Transmission Company (“Viking”) and DTM Interstate Transportation, LLC (“DTMInterstate”, and, collectively with Guardian, Midwestern and Viking, the “Guaranteeing Subsidiaries”), the other Guarantors (as defined in the Indenture referred to herein) and U.S. Bank Trust Company, National Association (as successor in interest to U.S. Bank National Association), as trustee under the Indenture referred to below (the “Trustee”).

W I T N E S S E T H

WHEREAS, the Issuer has heretofore executed and delivered to the Trustee an indenture (the “Indenture”), dated as of June 9, 2021 providing for the issuance of 4.125% Senior Notes (the “2029 Notes”) and the 4.375% Senior Notes due 2031 (the “2031 Notes” and together with the 2029 Notes, the “Notes”);

WHEREAS, the Indenture provides that under certain circumstances the Guaranteeing Subsidiaries shall execute and deliver to the Trustee a supplemental indenture pursuant to which the Guaranteeing Subsidiaries shall unconditionally guarantee all of the Issuer’s Obligations under the Notes and the Indenture on the terms and conditions set forth herein (the “Note Guarantee”); and

WHEREAS, pursuant to Section 9.01 of the Indenture, the Trustee is authorized to execute and deliver this Supplemental Indenture.

NOW, THEREFORE, in consideration of the foregoing and for other good and valuable consideration, the receipt of which is hereby acknowledged, the Guaranteeing Subsidiaries and the Trustee mutually covenant and agree for the equal and ratable benefit of the Holders of the Notes as follows:

1.Capitalized Terms. Capitalized terms used herein without definition shall have the meanings assigned to them in the Indenture.

2.Agreement to Guarantee. The Guaranteeing Subsidiaries hereby agree to provide an unconditional Guarantee on the terms and subject to the conditions set forth in the Note Guarantee and in the Indenture including, but not limited to, Article 10 thereof.

3.No Recourse Against Others. Neither DTE Energy nor any director, officer, partner, member, employee, incorporator, manager or stockholder or other owner of any Equity Interest of DTE Energy, the Issuer or any Guaranteeing Subsidiaries, as such, shall have any liability for any obligations of the Issuer or any Guaranteeing Subsidiaries under the Notes, any Note Guarantees, the Indenture or this Supplemental Indenture or for any claim based on, in respect of, or by reason of, such obligations or their creation. Each Holder of the Notes by accepting a Note waives and releases all such liability. The waiver and release are part of the consideration for issuance of the Notes. Such waiver may not be effective to waive liabilities under the federal securities laws and it is the view of the SEC that such a waiver is against public policy.

1

4.NEW YORK LAW TO GOVERN. THE LAW OF THE STATE OF NEW YORK SHALL GOVERN AND BE USED TO CONSTRUE THIS SUPPLEMENTAL INDENTURE.

5.Counterparts. This Supplemental Indenture may be executed in two or more counterparts, which when so executed shall constitute one and the same agreement. The exchange of copies of this Supplemental Indenture and of signature pages by facsimile or PDF transmission shall constitute effective execution and delivery of this Supplemental Indenture as to the parties hereto and may be used in lieu of the original Supplemental Indenture for all purposes. Signatures of the parties hereto transmitted by facsimile or PDF shall be deemed to be their original signatures for all purposes. The words “execution,” “signed,” “signature,” “delivery,” and words of like import in or relating to this Supplemental Indenture or any document to be signed in connection with this Supplemental Indenture shall be deemed to include electronic signatures, deliveries or the keeping of records in electronic form, each of which shall be of the same legal effect, validity or enforceability as a manually executed signature, physical delivery thereof or the use of a paper-based recordkeeping system, as the case may be, and the parties hereto consent to conduct the transactions contemplated hereunder by electronic means.

6.Effect of Headings. The Section headings herein are for convenience only and shall not affect the construction hereof.

7.The Trustee. The Trustee shall not be responsible in any manner whatsoever for or in respect of the validity or sufficiency of this Supplemental Indenture or for or in respect of the recitals contained herein, all of which recitals are made solely by the Guaranteeing Subsidiaries and the Issuer.

2

IN WITNESS WHEREOF, the parties hereto have caused this Supplemental Indenture to be duly executed and attested, all as of the date first above written.

    DT MIDSTREAM, INC.

By:    
Name:
Title:

GUARDIAN PIPELINE, L.L.C.

By:    
Name:
Title:

MIDWESTERN GAS TRANSMISSION COMPANY

By:    
Name:
Title:

VIKING GAS TRANSMISSION COMPANY

By:    
Name:
Title:

DTM INTERSTATE TRANSPORTATION, LLC

By:    
Name:
Title:

3

U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION,
as Trustee

By:    
Authorized Signatory

4

EX-4.2

Exhibit 4.2

Second Supplemental Indenture (this “Supplemental Indenture”), dated as of January 30, 2025, among Guardian Pipeline, L.L.C. (“Guardian”), Midwestern Gas Transmission Company (“Midwestern”), Viking Gas Transmission Company (“Viking”) and DTM Interstate Transportation, LLC (“DTM Interstate”, and, collectively with Guardian, Midwestern and Viking, the “Guaranteeing Subsidiaries”) and U.S. Bank Trust Company, National Association, as trustee under the Indenture referred to below (in such capacity, the “Trustee”), and as Notes Collateral Agent (as defined in the Indenture referred to herein).

W I T N E S S E T H

WHEREAS, DT Midstream, Inc. (the “Issuer”) has heretofore executed and delivered to the Trustee an indenture (the “Indenture”), dated as of April 11, 2022, providing for the issuance of $600,000,000 aggregate principal amount of 4.300% Senior Secured Notes due 2032 (the “Notes”); and

WHEREAS, pursuant to Section 9.01 of the Indenture, the Trustee and the Notes Collateral Agent are authorized to execute and deliver this Supplemental Indenture to amend or supplement the Indenture without the consent of any Holder of the Notes.

NOW, THEREFORE, in consideration of the foregoing and for other good and valuable consideration, the receipt of which is hereby acknowledged, the Guaranteeing Subsidiaries, the Trustee and the Notes Collateral Agent mutually covenant and agree for the equal and ratable benefit of the Holders of the Notes as follows:

1.    Capitalized Terms. Capitalized terms used herein without definition shall have the meanings assigned to them in the Indenture.

2.Agreement to Guarantee. The Guaranteeing Subsidiaries hereby agree to provide an unconditional Guarantee on the terms and subject to the conditions set forth in the Indenture including, but not limited to, Article 10 thereof.

3.    No Recourse Against Others. No director, officer, partner, member, employee, incorporator, manager or stockholder of the Issuer or any Guarantor, as such, will have any liability for any obligations of the Issuer or the Guarantors under the Indenture, the Notes, the Subsidiary Guarantees, the Note Security Documents, the Intercreditor Agreement or for any claim based on, in respect of, or by reason of, such obligations or their creation. Each Holder of Notes by accepting a Note waives and releases all such liability. The waiver and release are part of the consideration for the issuance of the Notes and the Subsidiary Guarantees.

4.    NEW YORK LAW TO GOVERN. THE LAW OF THE STATE OF NEW YORK SHALL GOVERN AND BE USED TO CONSTRUE THIS SUPPLEMENTAL INDENTURE.

5.Counterparts. This Supplemental Indenture may be executed in two or more counterparts, which when so executed shall constitute one and the same agreement. The exchange of copies of this Supplemental Indenture and of signature pages by facsimile or PDF

1

transmission shall constitute effective execution and delivery of this Supplemental Indenture as to the parties hereto and may be used in lieu of the original Supplemental Indenture for all purposes. Signatures of the parties hereto transmitted by facsimile or PDF shall be deemed to be their original signatures for all purposes. The words “execution,” “signed,” “signature,” “delivery,” and words of like import in or relating to this Supplemental Indenture or any document to be signed in connection with this Supplemental Indenture shall be deemed to include electronic signatures, deliveries or the keeping of records in electronic form, each of which shall be of the same legal effect, validity or enforceability as a manually executed signature, physical delivery thereof or the use of a paper-based recordkeeping system, as the case may be, and the parties hereto consent to conduct the transactions contemplated hereunder by electronic means.

6.Effect of Headings. The Section headings herein are for convenience only and shall not affect the construction hereof.

7.    The Trustee and the Notes Collateral Agent. Neither the Trustee nor the Notes Collateral Agent shall be responsible in any manner whatsoever for or in respect of the validity or sufficiency of this Supplemental Indenture or for or in respect of the recitals contained herein, all of which recitals are made solely by the Guaranteeing Subsidiaries.

[Signatures on following page]

2

IN WITNESS WHEREOF, the parties hereto have caused this Supplemental Indenture to be duly executed and attested, all as of the date first above written.

GUARDIAN PIPELINE, L.L.C.

By:    Name:
Title:

    MIDWESTERN GAS TRANSMISSION COMPANY

By:    Name:
Title:

    VIKING GAS TRANSMISSION COMPANY

By:    Name:
Title:

    DTM INTERSTATE TRANSPORTATION, LLC

By:    Name:
Title:

3

    U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION,
as Trustee and Notes Collateral Agent

By:    

4

EX-4.3

Exhibit 4.3

First Supplemental Indenture (this “Supplemental Indenture”), dated as of January 30, 2025, among Guardian Pipeline, L.L.C. (“Guardian”), Midwestern Gas Transmission Company (“Midwestern”), Viking Gas Transmission Company (“Viking”) and DTM Interstate Transportation, LLC (“DTM Interstate”, and, collectively with Guardian, Midwestern and Viking, the “Guaranteeing Subsidiaries”) and U.S. Bank Trust Company, National Association, as trustee under the Indenture referred to below (in such capacity, the “Trustee”), and as Notes Collateral Agent (as defined in the Indenture referred to herein).

W I T N E S S E T H

WHEREAS, DT Midstream, Inc. (the “Issuer”) has heretofore executed and delivered to the Trustee an indenture (the “Indenture”), dated as of December 6, 2024, providing for the issuance of $650,000,000 aggregate principal amount of 5.800% Senior Secured Notes due 2034 (the “Notes”); and

WHEREAS, pursuant to Section 9.01 of the Indenture, the Trustee and the Notes Collateral Agent are authorized to execute and deliver this Supplemental Indenture to amend or supplement the Indenture without the consent of any Holder of the Notes.

NOW, THEREFORE, in consideration of the foregoing and for other good and valuable consideration, the receipt of which is hereby acknowledged, the Guaranteeing Subsidiaries, the Trustee and the Notes Collateral Agent mutually covenant and agree for the equal and ratable benefit of the Holders of the Notes as follows:

1.    Capitalized Terms. Capitalized terms used herein without definition shall have the meanings assigned to them in the Indenture.

2.Agreement to Guarantee. The Guaranteeing Subsidiaries hereby agree to provide an unconditional Guarantee on the terms and subject to the conditions set forth in the Indenture including, but not limited to, Article 10 thereof.

3.    No Recourse Against Others. No director, officer, partner, member, employee, incorporator, manager or stockholder of the Issuer or any Guarantor, as such, will have any liability for any obligations of the Issuer or the Guarantors under the Indenture, the Notes, the Subsidiary Guarantees, the Note Security Documents, the Intercreditor Agreement or for any claim based on, in respect of, or by reason of, such obligations or their creation. Each Holder of Notes by accepting a Note waives and releases all such liability. The waiver and release are part of the consideration for the issuance of the Notes and the Subsidiary Guarantees.

4.    NEW YORK LAW TO GOVERN. THE LAW OF THE STATE OF NEW YORK SHALL GOVERN AND BE USED TO CONSTRUE THIS SUPPLEMENTAL INDENTURE.

5.Counterparts. This Supplemental Indenture may be executed in two or more counterparts, which when so executed shall constitute one and the same agreement. The exchange of copies of this Supplemental Indenture and of signature pages by facsimile or PDF

1

transmission shall constitute effective execution and delivery of this Supplemental Indenture as to the parties hereto and may be used in lieu of the original Supplemental Indenture for all purposes. Signatures of the parties hereto transmitted by facsimile or PDF shall be deemed to be their original signatures for all purposes. The words “execution,” “signed,” “signature,” “delivery,” and words of like import in or relating to this Supplemental Indenture or any document to be signed in connection with this Supplemental Indenture shall be deemed to include electronic signatures, deliveries or the keeping of records in electronic form, each of which shall be of the same legal effect, validity or enforceability as a manually executed signature, physical delivery thereof or the use of a paper-based recordkeeping system, as the case may be, and the parties hereto consent to conduct the transactions contemplated hereunder by electronic means.

6.Effect of Headings. The Section headings herein are for convenience only and shall not affect the construction hereof.

7.    The Trustee and the Notes Collateral Agent. Neither the Trustee nor the Notes Collateral Agent shall be responsible in any manner whatsoever for or in respect of the validity or sufficiency of this Supplemental Indenture or for or in respect of the recitals contained herein, all of which recitals are made solely by the Guaranteeing Subsidiaries.

[Signatures on following page]

2

IN WITNESS WHEREOF, the parties hereto have caused this Supplemental Indenture to be duly executed and attested, all as of the date first above written.

GUARDIAN PIPELINE, L.L.C.

By:    Name:
Title:

    MIDWESTERN GAS TRANSMISSION COMPANY

By:    Name:
Title:

    VIKING GAS TRANSMISSION COMPANY

By:    Name:
Title:

    DTM INTERSTATE TRANSPORTATION, LLC

By:    Name:
Title:

3

    U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION,
as Trustee and Notes Collateral Agent

By:    

4

EX-21.1

Exhibit 21.1

SUBSIDIARIES OF DT MIDSTREAM, INC.

DT Midstream’s principal subsidiaries as of December 31, 2024 are listed below. All other subsidiaries, if considered in the aggregate as a single subsidiary, would not constitute a significant subsidiary.

Subsidiary		State of Incorporation
1	Bluestone Pipeline Company of Pennsylvania, LLC	Pennsylvania
2	DTM Appalachia Gathering, LLC	Delaware
3	DTM LEAP Gas Gathering, LLC	Delaware
4	DTM Louisiana Gathering, LLC	Delaware
5	DTM Millennium Company	Michigan
6	DTM Nexus, LLC	Delaware
7	DTM Vector Company	Michigan
8	Guardian Pipeline, LLC	Delaware
9	Midwestern Gas Transmission Company	Delaware
10	Stonewall Gas Gathering LLC	Delaware
11	Stonewall Gas Holdings, LLC	Delaware
12	Susquehanna Gathering Company I, LLC	Pennsylvania
13	Viking Gas Transmission Company	Delaware

EX-23.1

Exhibit 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We hereby consent to the incorporation by reference in the Registration Statements on Form S-3 (No. 333-283345) and Form S-8 (No. 333-257607) of DT Midstream, Inc. of our report dated February 26, 2025 relating to the financial statements and the effectiveness of internal control over financial reporting, which appears in this Form 10-K.

/s/ PricewaterhouseCoopers LLP

Detroit, Michigan

February 26, 2025

EX-31.1

Exhibit 31.1

FORM 10-K CERTIFICATION

I, David Slater, certify that:

1.I have reviewed this Annual Report on Form 10-K of DT Midstream, Inc.;

2.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;

3.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;

4.The registrant's other certifying officer(s) 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

5.The registrant's other certifying officer(s) 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.

/S/ DAVID J. SLATER	Date:	February 26, 2025
David J. Slater President and Chief Executive Officer of DT Midstream, Inc.

EX-31.2

Exhibit 31.2

FORM 10-K CERTIFICATION

I, Jeffrey Jewell, certify that:

1.I have reviewed this Annual Report on Form 10-K of DT Midstream, Inc.;

2.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;

3.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;

4.The registrant's other certifying officer(s) 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

5.The registrant's other certifying officer(s) 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.

/S/ JEFFREY A. JEWELL	Date:	February 26, 2025
Jeffrey A. Jewell Executive Vice President Chief Financial and Accounting Officer of DT Midstream, Inc.

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 DT Midstream, Inc. (the “Company”) for the annual ended December 31, 2024, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, David J. Slater, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that to the best of my knowledge and belief:

(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 Company.

Date:	February 26, 2025	/S/ DAVID J. SLATER
		David J. Slater President and Chief Executive Officer of DT Midstream, Inc.

A signed original of this written statement required by Section 906 has been provided to the Company and will be retained by the Company 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 DT Midstream, Inc. (the “Company”) for the annual ended December 31, 2024, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Jeffrey A. Jewell, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that to the best of my knowledge and belief:

(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 Company.

Date:	February 26, 2025	/S/ JEFFREY A. JEWELL
		Jeffrey A. Jewell Executive Vice President, Chief Financial and Accounting Officer of DT Midstream, Inc.

A signed original of this written statement required by Section 906 has been provided to the Company and will be retained by the Company and furnished to the Securities and Exchange Commission or its staff upon request.

EX-95.1

EXHIBIT 95.1

Mine Safety Disclosure

The following disclosure is provided pursuant to Section 1503(a) of the Dodd-Frank Wall Street Reform and Consumer Protection Act, which requires certain disclosures by companies required to file periodic reports under the Securities Exchange Act of 1934, as amended, that operate mines regulated under the Federal Mine Safety and Health Act of 1977.

The table that follows reflects citations, orders, violations and proposed assessments issued by the Mine Safety and Health Administration (the “MSHA”) to DTM Louisiana Gathering, LLC, an indirect wholly owned subsidiary of DT Midstream, Inc. The disclosure is with respect to the year ended December 31, 2024. Due to timing and other factors, the data may not agree with the mine data retrieval system maintained by the MSHA at www.MSHA.gov.

DT Midstream, Inc.

Mine Safety Disclosure

For the Year Ended December 31, 2024

Operation (1)	Section 104 S&S Citations	Section 104(b) Orders	Section 104(d) Citations and Orders	Section 110(b)(2) Violations	Section 107(a) Orders	Total Dollar Value of Proposed MSHA Assessments (2)		Total Number of Mining Related Fatalities	Received Notice of Pattern of Violations Under Section 104(e)	Received Notice of Potential to Have Pattern Under Section 104(e)	Legal Actions Pending as of the Last Day of Period	Legal Actions Initiated During Period	Legal Actions Resolved During Period
DTM GEN6 Proppants, LLC ID: 1601585	—	—	2	—	—	$	8,411	—	No	No	—	—	—
Total	—	—	2	—	—	$	8,411	—	No	No	—	—	—

(1) The definition of mine under section 3 of the Mine Act includes the mine, as well as other items used in, or to be used in, or resulting from, the work of extracting minerals, such as land, structures, facilities, equipment, machines, tools, and preparation facilities. Unless otherwise indicated, any of these other items associated with a single mine have been aggregated in the totals for that mine.

(2) The whole-dollar amounts included are the total dollar value of all proposed or outstanding assessments, regardless of classification, received from MSHA on or before December 31, 2024 regardless of whether the assessment has been challenged or appealed, for alleged violations occurring during the year ended December 31, 2024. Citations and orders can be contested and appealed, and as part of that process, are sometimes reduced in severity and amount, and are sometimes dismissed. The number of citations, orders, and proposed assessments vary by inspector and also vary depending on the size and type of the operation.

XML

Cover - USD ($) $ in Billions	12 Months Ended
	Dec. 31, 2024	Feb. 14, 2025	Jun. 28, 2024
Cover [Abstract]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2024
Current Fiscal Year End Date	--12-31
Document Transition Report	false
Entity File Number	001-40392
Entity Registrant Name	DT Midstream, Inc.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	38-2663964
Entity Address, Address Line One	500 Woodward Ave., Suite 2900
Entity Address, City or Town	Detroit
Entity Address, State or Province	MI
Entity Address, Postal Zip Code	48226-1279
City Area Code	313
Local Phone Number	402-8532
Title of 12(b) Security	Common stock, par value $0.01
Trading Symbol	DTM
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
Document Financial Statement Error Correction [Flag]	false
Entity Shell Company	false
Entity Public Float			$ 6.9
Entity Common Stock, Shares Outstanding		101,358,534
Documents Incorporated by Reference	Certain information in DT Midstream's definitive Proxy Statement for our 2025 Annual Meeting of Common Shareholders to be held May 6, 2025, which will be filed with the Securities and Exchange Commission pursuant to Regulation 14A, not later than 120 days after the end of the registrant’s fiscal year covered by this report on Form 10-K, is incorporated herein by reference to Part III (Items 10, 11, 12, 13, and 14) of this Form 10-K.
Entity Central Index Key	0001842022
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	FY
Amendment Flag	false

XML

Audit Information	12 Months Ended
	Dec. 31, 2024
Audit Information [Abstract]
Auditor Firm ID	238
Auditor Name	PricewaterhouseCoopers LLP
Auditor Location	Detroit, Michigan

XML

Consolidated Statements of Operations - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Revenues
Operating revenues	$ 981	$ 922	$ 920
Operating Expenses
Operation and maintenance	244	245	267
Depreciation and amortization	209	182	170
Taxes other than income	39	28	28
Asset (gains) losses and impairments, net	0	(4)	(23)
Operating Income	489	471	478
Other (Income) and Deductions
Interest expense	153	150	137
Interest income	(7)	(1)	(3)
Earnings from equity method investees	(162)	(177)	(150)
Loss from financing activities	5	0	13
Other income	(4)	(1)	(1)
Income Before Income Taxes	504	500	482
Income Tax Expense	137	104	100
Net Income	367	396	382
Less: Net Income Attributable to Noncontrolling Interests	13	12	12
Net Income Attributable to DT Midstream	$ 354	$ 384	$ 370
Basic Earnings per Common Share
Net Income Attributable to DT Midstream (in dollars per share)	$ 3.63	$ 3.97	$ 3.83
Diluted Earnings per Common Share
Net Income Attributable to DT Midstream (in dollars per share)	$ 3.60	$ 3.94	$ 3.81
Weighted Average Common Shares Outstanding
Basic (in shares)	97.6	96.9	96.7
Diluted (in shares)	98.4	97.5	97.2

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Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Statement of Comprehensive Income [Abstract]
Net Income	$ 367	$ 396	$ 382
Foreign currency translation and unrealized gain on derivatives, net of tax	0	2	0
Other comprehensive income	0	2	0
Comprehensive income	367	398	382
Less: Comprehensive income attributable to noncontrolling interests	13	12	12
Comprehensive Income Attributable to DT Midstream	$ 354	$ 386	$ 370

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Consolidated Statements of Financial Position - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Current Assets
Cash and cash equivalents	$ 68	$ 56
Accounts receivable (net of $— allowance for expected credit loss for each period end)	172	154
Deferred property taxes	33	31
Taxes receivable	8	15
Prepaid expenses and other	29	16
Total Current Assets	310	272
Investments
Investments in equity method investees	1,297	1,762
Property
Property, plant, and equipment	6,525	5,282
Accumulated depreciation	(998)	(848)
Net Property, plant, and equipment	5,527	4,434
Other Assets
Goodwill	776	473
Long-term notes receivable — related party	4	4
Operating lease right-of-use assets	49	38
Intangible assets, net	1,921	1,968
Other	51	31
Total Other Assets	2,801	2,514
Total Assets	9,935	8,982
Current Liabilities
Accounts payable	77	94
Short-term borrowings	150	165
Operating lease liabilities	16	13
Dividends payable	75	67
Interest payable	12	10
Property taxes payable	42	34
Accrued compensation	19	18
Contract liabilities	18	18
Other	17	15
Total Current Liabilities	426	434
Long-Term Debt, net	3,319	3,065
Other Liabilities
Deferred income taxes	1,129	1,031
Operating lease liabilities	36	27
Contract liabilities	135	111
Regulatory liabilities	90	0
Other	34	34
Total Other Liabilities	1,424	1,203
Total Liabilities	5,169	4,702
Commitments and Contingencies (Note 12)
Stockholders' Equity
Preferred stock ($0.01 par value, 50,000,000 shares authorized, and no shares issued or outstanding as of December 31, 2024 and 2023)	0	0
Common stock ($0.01 par value, 550,000,000 shares authorized, and 101,324,894 and 96,971,021 shares issued and outstanding as of December 31, 2024 and 2023, respectively)	1	1
Additional paid-in capital	3,911	3,485
Retained earnings	723	661
Accumulated other comprehensive income (loss)	(8)	(8)
Total DT Midstream Equity	4,627	4,139
Noncontrolling interests	139	141
Total Equity	4,766	4,280
Total Liabilities and Equity	$ 9,935	$ 8,982

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Consolidated Statements of Financial Position (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Current Assets
Allowance for expected credit loss	$ 0	$ 0
Stockholders' Equity
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	50,000,000	50,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	550,000,000	550,000,000
Common stock, shares issued (in shares)	101,324,894	96,971,021
Common stock, shares outstanding (in shares)	101,324,894	96,971,021

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Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Operating Activities
Net Income	$ 367	$ 396	$ 382
Adjustments to reconcile Net Income to Net cash and cash equivalents from operating activities:
Depreciation and amortization	209	182	170
Stock-based compensation	23	20	17
Amortization of operating lease right-of-use assets	18	18	19
Deferred income taxes	120	110	70
Earnings from equity method investees	(162)	(177)	(150)
Dividends from equity method investees	161	196	181
Asset (gains) losses and impairments, net	0	0	(17)
Loss from financing activities	5	0	13
Changes in assets and liabilities:
Accounts receivable, net	11	7	8
Accounts payable	11	(5)	7
Contract liabilities	23	97	3
Other current and noncurrent assets and liabilities	(23)	(46)	22
Net cash and cash equivalents from operating activities	763	798	725
Investing Activities
Plant and equipment expenditures	(350)	(772)	(338)
Acquisition accounted for as a business combination	(1,198)	0	0
Proceeds from sale of notes receivable	0	0	22
Distributions from equity method investees	472	427	17
Contributions to equity method investees	(5)	(7)	(5)
Acquisition of additional interest in equity method investee	0	0	(552)
Other investing activities	0	1	2
Net cash and cash equivalents used for investing activities	(1,081)	(351)	(854)
Financing Activities
Issuance of long-term debt, net of discount and issuance costs	644	0	591
Repayment of long-term debt	(399)	0	(596)
Borrowings under the Revolving Credit Facility	385	540	370
Repayment of borrowings under the Revolving Credit Facility	(400)	(705)	(40)
Payment of Revolving Credit Facility issuance costs	(3)	0	(3)
Issuance of common stock, net of issuance costs	406	0	0
Distributions to noncontrolling interests	(17)	(18)	(14)
Dividends paid on common stock	(280)	(263)	(244)
Other financing activities	(6)	(6)	(6)
Net cash and cash equivalents from (used for) financing activities	330	(452)	58
Net Increase (Decrease) in Cash and Cash Equivalents	12	(5)	(71)
Cash and Cash Equivalents at Beginning of Period	56	61	132
Cash and Cash Equivalents at End of Period	68	56	61
Cash paid for:
Interest, net of interest capitalized	140	140	125
Income taxes	12	22	24
Supplemental disclosure of non-cash investing and financing activities
Plant and equipment expenditures in accounts payable and other accrued liabilities	$ 44	$ 80	$ 99

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Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Millions		Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Noncontrolling Interests
Beginning balance (in shares) at Dec. 31, 2021			96,734,000
Beginning balance at Dec. 31, 2021		$ 4,021	$ 1	$ 3,450	$ 431	$ (10)	$ 149
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income		382			370		12
Dividends declared on common stock		(248)			(248)
Distributions to noncontrolling interests		(14)					(14)
Stock-based compensation and other (in shares)			78,000
Stock-based compensation and other		15		17	(2)
Repurchase of common stock (in shares)			(57,000)
Repurchase of common stock		(3)			(3)
Taxes and other adjustments		1		2	(1)
Other comprehensive income, net of tax		0
Ending balance (in shares) at Dec. 31, 2022			96,755,000
Ending balance at Dec. 31, 2022		4,154	$ 1	3,469	547	(10)	147
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income		396			384		12
Dividends declared on common stock		(268)			(268)
Distributions to noncontrolling interests		(18)					(18)
Stock-based compensation and other (in shares)			216,000
Stock-based compensation and other		14		16	(2)
Other comprehensive income, net of tax		$ 2				2
Ending balance (in shares) at Dec. 31, 2023		96,971,021	96,971,000
Ending balance at Dec. 31, 2023		$ 4,280	$ 1	3,485	661	(8)	141
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income		367			354		13
Issuance of common shares (in shares)	[1]		4,169,000
Issuance of common shares	[1]	406		406
Dividends declared on common stock		(288)			(288)
Contributions from noncontrolling interests		2					2
Distributions to noncontrolling interests		(17)					(17)
Stock-based compensation and other (in shares)			185,000
Stock-based compensation and other		16		20	(4)
Other comprehensive income, net of tax		$ 0
Ending balance (in shares) at Dec. 31, 2024		101,324,894	101,325,000
Ending balance at Dec. 31, 2024		$ 4,766	$ 1	$ 3,911	$ 723	$ (8)	$ 139

[1] Issuance of common shares at $0.01 par value. See Note 8, "Earnings Per Share and Dividends," to the Consolidated Financial Statements.

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Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) - $ / shares	3 Months Ended												12 Months Ended
	Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Statement of Stockholders' Equity [Abstract]
Dividends declared on common stock (in dollars per share)	$ 0.735	$ 0.735	$ 0.735	$ 0.735	$ 0.69	$ 0.69	$ 0.69	$ 0.69	$ 0.64	$ 0.64	$ 0.64	$ 0.64	$ 2.94	$ 2.76	$ 2.56
Common stock, par value (in dollars per share)	$ 0.01				$ 0.01								$ 0.01	$ 0.01

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DESCRIPTION OF THE BUSINESS AND BASIS OF PRESENTATION

12 Months Ended

Dec. 31, 2024

Organization, Consolidation and Presentation of Financial Statements [Abstract]

DESCRIPTION OF THE BUSINESS AND BASIS OF PRESENTATION

DESCRIPTION OF THE BUSINESS AND BASIS OF PRESENTATION

Description of the Business

DT Midstream is an owner, operator, and developer of an integrated portfolio of natural gas midstream assets. We provide multiple, integrated natural gas services to customers through two segments: (i) Pipeline, which includes interstate pipelines, intrastate pipelines, storage systems, gathering lateral pipelines including related treatment plants and compression and surface facilities, and (ii) Gathering, which includes gathering systems, related treatment plants, and compression and surface facilities. Our Pipeline segment also includes joint venture interests in equity method investees which own and operate interstate pipelines that connect to our wholly owned assets. On December 31, 2024, we closed on the Midwest Pipeline Acquisition of three FERC-regulated natural gas transmission pipelines. See Note 16, "Acquisitions" to the Consolidated Financial Statements.

Our core assets strategically connect key demand centers in the Midwestern U.S., Eastern Canada and Northeastern U.S. regions to the premium production areas of the Marcellus/Utica natural gas formation in the Appalachian Basin, and connect key demand centers and LNG export terminals in the Gulf Coast region to premium production areas of the Haynesville natural gas formation.

Basis of Presentation`

The Consolidated Financial Statements and Notes to Consolidated Financial Statements are prepared under GAAP.

These accounting principles require management to use estimates and assumptions that impact reported amounts of assets, liabilities, revenues and expenses, and the disclosure of contingent assets and liabilities. Actual results may differ from our estimates. We believe the assumptions underlying these financial statements are reasonable.

In our opinion, the accompanying Consolidated Financial Statements include all adjustments, consisting of normal recurring adjustments, necessary to present a fair statement of our financial position as of December 31, 2024, results of operations for the years ended December 31, 2024, 2023 and 2022, statement of changes in stockholders' equity for the years ended December 31, 2024, 2023 and 2022, and cash flows for the years ended December 31, 2024, 2023 and 2022.

Cash Management

Our sources of liquidity include cash generated from operations and available borrowings under our Revolving Credit Facility.

Principles of Consolidation

We consolidate all majority-owned subsidiaries and investments in entities in which we have a controlling influence. Non-controlled investments are accounted for using the equity method of accounting when we are able to significantly influence the operating policies of the investee. When we do not influence the operating policies of an investee, the equity investment is measured at fair value, if readily determinable, or if not readily determinable, at cost less impairment, if applicable. We eliminate all intercompany balances and transactions.

We evaluate whether an entity is a VIE whenever reconsideration events occur. We consolidate VIEs for which we are the primary beneficiary. When assessing the determination of the primary beneficiary, we consider all relevant facts and circumstances, including: the power, through voting or similar rights, to direct the activities of the VIE that most significantly impact the VIE's economic performance and the obligation to absorb the expected losses and/or the right to receive the expected returns of the VIE. We perform ongoing reassessments of all VIEs to determine if the primary beneficiary status has changed.

We own an 85% interest in the Stonewall VIE and are the primary beneficiary, therefore Stonewall is consolidated. We own a 50% interest in the South Romeo VIE and are the primary beneficiary, therefore South Romeo is consolidated.

The following table summarizes the major line items in the Consolidated Statements of Financial Position for consolidated VIEs as of December 31, 2024 and 2023. All assets and liabilities of a consolidated VIE are included in the table when it has been determined that a consolidated VIE has either (1) assets that can be used only to settle obligations of the VIE or (2) liabilities for which creditors do not have recourse to the general credit of the primary beneficiary. The assets and liabilities of consolidated VIEs that meet the definition of a business and whose assets can be used for purposes other than the settlement of the VIEs' obligations have been excluded from the table below.

	December 31,
	2024		2023
	(millions)
ASSETS (a)
Cash	$	17	$	13
Accounts receivable	11		10
Other current assets	2		2
Intangible assets, net	468		483
Property, plant and equipment, net	391		391
Goodwill	25		25
	$	914	$	924
LIABILITIES (a)
Accounts payable and other current liabilities	$	5	$	4
Other noncurrent liabilities	3		3
	$	8	$	7

_____________________________________

(a)Amounts shown are 100% of the consolidated VIEs' assets and liabilities.

Related Parties

Transactions between DT Midstream and our equity method investees have been presented as related party transactions in the accompanying Consolidated Financial Statements. See Note 15, "Related Party Transactions" to the Consolidated Financial Statements.

Equity Method Investments

Non-controlled investments are accounted for using the equity method of accounting when we are able to significantly influence the operating policies of the investee. Under the equity method of accounting, investments are recorded at historical cost as an asset and adjusted for capital contributions, dividends and distributions received, and our share of the investee's earnings or losses, which are recorded as earnings from equity method investees on the Consolidated Statements of Operations. Equity method investments and related activity are included in the Pipeline segment.

Our equity method investments are periodically evaluated for certain factors that may be indicative of other-than-temporary impairment. As of December 31, 2024 and 2023, our carrying amounts of investments in equity method investees exceeded our share of the underlying equity in the net assets of the investees by $336 million and $352 million, respectively. The difference will be amortized over the life of the underlying assets. As of both December 31, 2024 and 2023, our consolidated retained earnings balance did not have undistributed earnings from equity method investments. We use the cumulative earnings approach to classify proceeds received from equity method investees as dividends or distributions on the Consolidated Statements of Cash Flows.

Earnings from equity method investees include:

	Year Ended December 31,
	2024		2023		2022
	(millions)
NEXUS	$	62	$	68	$	61
Vector	41		38		36
Millennium	59		71		53
Total earnings from equity method investees	$	162	$	177	$	150

Equity method investees are described below:

	Investments As of				% Owned As of
	December 31,				December 31,
Equity Method Investee	2024		2023		2024	2023
	(millions)
NEXUS	$	880	$	900	50%	50%
Vector	134		135		40%	40%
Millennium	283		727		52.5%	52.5%
Total investments in equity method investees	$	1,297	$	1,762

In September 2024, Millennium closed on the sale of $800 million of senior unsecured notes with a weighted-average coupon rate of 5.88%. We received a distribution from Millennium of $416 million, net of fees and expenses, which reduced our investment balance. We used the proceeds from the distribution to repay our existing indebtedness under our Term Loan Facility and for general corporate purposes.

In May 2023, NEXUS closed on the sale of $750 million of senior unsecured notes with a weighted-average coupon rate of 5.52%. We received a distribution from NEXUS of $371 million, net of fees and expenses, which reduced our investment balance. We used the proceeds from the distribution to repay borrowings outstanding under our Revolving Credit Facility.

In October 2022, DT Midstream closed on the $552 million purchase of an additional 26.25% ownership interest in Millennium from National Grid. The transaction was financed with cash on hand and available capacity under the Company's Revolving Credit Facility. The purchase constituted National Grid's full ownership interest in Millennium and brought our total ownership interest in Millennium to 52.5%. We account for our ownership interest in Millennium under the equity method of accounting. Millennium is not a VIE and we do not have a controlling interest due to shared control with our partner over all of Millennium's significant business activities. Our carrying amount of our Millennium investment exceeded our share of the underlying equity in the net assets of Millennium by $343 million on the acquisition date.

The following tables present summarized financial information of our non-consolidated equity method investees. The amounts included below represent 100% of the results of continuing operations of such entities, including the portion owned by other parties.

Summarized balance sheet data is as follows:

	December 31,
	2024		2023
	(millions)
Current assets	$	170	$	159
Noncurrent assets	3,939		4,057
Current liabilities	209		208
Noncurrent liabilities	$	1,930	$	1,177

Summarized income statement data is as follows:

	Year Ended December 31,
	2024		2023		2022
	(millions)
Operating revenues	$	818	$	823	$	800
Operating expenses	376		377		396
Net Income	$	364	$	392	$	372

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SIGNIFICANT ACCOUNTING POLICIES

12 Months Ended

Dec. 31, 2024

Accounting Policies [Abstract]

SIGNIFICANT ACCOUNTING POLICIES

SIGNIFICANT ACCOUNTING POLICIES

Cash and Cash Equivalents

Cash and cash equivalents include cash in banks and highly liquid money market investments with remaining maturities of three months or less, when purchased. Cash equivalents are stated at cost, which approximates fair value.

Financing Receivables

Financing receivables are primarily composed of trade accounts receivable and notes receivable, which are stated at net realizable value.

We regularly monitor the credit quality of our financing receivables by reviewing counterparty credit quality indicators and monitoring for triggering events, such as a credit rating downgrade or bankruptcy. We have three internal grades of credit quality, with internal grade 1 as the lowest risk and internal grade 3 as the highest risk. The related credit quality indicators and risk ratings utilized to develop the internal grades have been updated through December 31, 2024. As of December 31, 2024, the notes receivable — related party of $4 million, which originated prior to 2021, was classified as internal grade 1. There are no notes receivable on nonaccrual status and no past due financing receivables as of December 31, 2024.

Notes receivable are typically considered delinquent (past due) when payment is not received for periods ranging from 60 to 120 days. We cease accruing interest income (nonaccrual status) and may either write off or establish an allowance for expected credit loss for the note receivable when it is expected that all contractual principal or interest amounts due will not be collected. In determining an allowance for expected credit losses for or the write off of notes receivable, we consider the historical payment experience and other factors that are expected to have a specific impact on collection, including existing and future economic conditions. Cash receipts for notes receivable on nonaccrual status that do not bring the account contractually current are first applied to contractually owed past due interest, with any remainder applied to principal. Recognition of interest income is generally resumed when the note receivable becomes contractually current.

We had an investment in certain assets in the Utica Shale region which was accounted for as a note receivable — third party. A third party purchased our investment in certain assets in the Utica Shale region based on significantly improved commodity pricing during the second quarter 2022 for proceeds of $22 million. This resulted in a gain of $17 million recorded in Asset (gains) losses and impairments, net on the Consolidated Statement of Operations. We maintain no continuing involvement with the note receivable.

For trade accounts receivable, the customer allowance for expected credit loss is calculated based on specific review of future collections based on receivable balances generally in excess of 30 days. Existing and future economic conditions, historical loss rates, customer trends and other relevant factors that may affect our ability to collect are also considered. Receivables are written off on a specific identification basis and determined based on the particular circumstances of the associated receivable. Uncollectible expense (recovery) was zero for each of the years ended December 31, 2024, 2023 and 2022.

Our collections on accounts receivable from customers are current, and no material rate of historical loss was noted, which resulted in no allowance for expected credit loss as of December 31, 2024 or 2023. Any balance would be shown as a deduction from the respective financing receivable's balance in the Consolidated Statements of Financial Position.

Property, Plant, and Equipment

Property is stated at cost and includes construction-related labor, materials, overhead and capitalized interest. Property for FERC-Regulated entities includes equity AFUDC. Equity AFUDC represents the capitalization of the estimated average cost of equity during construction projects and is recorded as a credit to allowance for funds used during construction in our Consolidated Statements of Operations. Expenditures for maintenance and repairs are charged to expense when incurred. Property, plant and equipment is depreciated over its estimated useful life using the straight-line method. See Note 6, "Property, Plant, and Equipment and Intangible Assets" to the Consolidated Financial Statements.

On December 31, 2024, DT Midstream closed on the Midwest Pipeline Acquisition of three FERC-regulated natural gas transmission pipelines. These assets are accounted for under ASC 980, which in some cases requires that the cost of regulated property retired or sold, plus removal costs, less salvage, be charged to accumulated depreciation. For regulated assets, depreciation studies to assess the estimated useful lives of the asset are typically conducted as part of rate proceedings or tariff filings. Changes in economic lives, if applicable, are implemented prospectively as of the approved effective date. See Note 16, "Acquisitions" and Note 17, "Regulatory Matters" to the Consolidated Financial Statements.

Intangible Assets

Intangible assets with finite useful lives are amortized on a straight-line basis over the periods benefited. See Note 6, "Property, Plant, and Equipment and Intangible Assets" to the Consolidated Financial Statements.

Long-Lived Assets

Long-lived assets are reviewed for impairment whenever events or changes in circumstances indicate the carrying amount of an asset may not be recoverable. If the carrying amount of the asset exceeds the expected undiscounted future cash flows generated by the asset, an impairment loss is recognized resulting in the asset being written down to its estimated fair value. Assets to be disposed of are reported at the lower of the carrying amount or fair value, less costs to sell.

Purchase Accounting

In accordance with the business combination acquisition method of accounting, the assets acquired and liabilities assumed in an acquired business are measured at their estimated fair values at the acquisition date.

Goodwill

DT Midstream has goodwill resulting from business combinations. For each reporting unit with goodwill, we perform an impairment test annually or whenever events or circumstances indicate that the value of goodwill may be impaired.

Operation and Maintenance

Operation and maintenance is primarily comprised of costs for labor and employee benefits, outside services, materials, compression, purchased natural gas, operating lease costs, office costs, and other operating and maintenance costs.

Depreciation and Amortization

Depreciation and amortization is related to Property, plant and equipment and Customer relationships and other intangible assets, net, used in our transportation, storage and gathering businesses.

Other Significant Accounting Policies

Footnote	Title
Note 1	Equity Method Investments
Note 4	Revenue
Note 7	Income Taxes
Note 9	Fair Value
Note 11	Leases
Note 14	Reportable Segments
Note 16	Acquisitions
Note 17	Regulation

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NEW ACCOUNTING PRONOUNCEMENTS

12 Months Ended

Dec. 31, 2024

Accounting Standards Update and Change in Accounting Principle [Abstract]

NEW ACCOUNTING PRONOUNCEMENTS

NEW ACCOUNTING PRONOUNCEMENTS

Recently Adopted Pronouncements

In November 2023, the FASB issued ASU No. 2023-07, Segment Reporting (Topic 280) - Improvements to Reportable Segment Disclosures. The amendments improve reportable segment disclosure requirements, primarily through enhanced disclosures about significant segment expenses and interim disclosure requirements. The amendments are effective for fiscal years beginning after December 15, 2023 and interim periods within fiscal years beginning after December 15, 2024. Early adoption is permitted. We adopted this ASU on December 31, 2024, and applied the amendments retrospectively to all prior periods presented in our Consolidated Financial Statements. See Note 14, "Segment and Related Information," to the Consolidated Financial Statements.

Recently Issued Pronouncements

In December 2023, the FASB issued ASU No. 2023-09, Income Taxes (Topic 740) - Improvements to Income Tax Disclosures. The amendments improve transparency of income tax disclosure requirements, primarily through enhanced disclosures of rate reconciliation and income taxes paid. The amendments are effective for annual periods beginning after December 15, 2024. Early adoption is permitted. We continue to evaluate the impact of this standard's adoption on our Consolidated Financial Statements.

In November 2024, the FASB issued ASU No. 2024-03, Income Statement—Reporting Comprehensive Income—Expense Disaggregation Disclosures (Subtopic 220-40) - Disaggregation of Income Statement Expenses. The amendments require enhanced disclosures of specified costs and expenses included in significant expense captions in the income statement, including purchases of inventory, employee compensation, depreciation, amortization, and other key amounts. The FASB subsequently issued ASU No. 2025-01 in January 2025 to clarify the effective date of ASU No. 2024-03. The amendments are effective for fiscal years beginning after December 15, 2026 and interim reporting periods within annual reporting periods beginning after December 15, 2027. Early adoption is permitted. We are currently evaluating the impact of this standard's adoption on our Consolidated Financial Statements.

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REVENUE

12 Months Ended

Dec. 31, 2024

Revenue from Contract with Customer [Abstract]

REVENUE

REVENUE

Significant Accounting Policy – Revenue

Pipeline revenues consist of services related to the gathering, transportation and/or storage of natural gas. Gathering revenues consist of services related to the gathering, processing, and/or treating of natural gas. Revenue is measured based upon the pricing or consideration for such services specified in the contract with a customer. Consideration may consist of both fixed components including fixed demand charges and fixed deficiency fee rates for MVCs, and variable components including fixed rates for the actual volumes flowed under interruptible services and other associated fees.

Our contracts with customers generally contain a single performance obligation, which is a promise to deliver either a distinct service or a series of distinct services to the customer. When multiple performance obligations exist, the contract consideration is allocated between the performance obligations based on the relative standalone selling price, which is determined by prices charged to customers or the adjusted market assessment approach. The adjusted market assessment approach involves evaluating the market in which we sell services and estimating the price that a customer in that market would be willing to pay.

Revenue is recognized when performance obligations are satisfied by delivering a service to a customer, which occurs when the service is provided to the customer. When a customer simultaneously receives and consumes the service provided, revenue is recognized over time. Alternatively, if it is determined that the criteria for recognition of revenue over time is not met, the revenue is considered to be recognized at a point in time. Our revenues, including estimated unbilled amounts, are generally recognized over time as actual services are provided, or ratably over time when providing a stand-ready service. Unbilled amounts are generally determined using preliminary meter data volumes and contracted pricing, and typically result in minor adjustments. Generally, uncertainties in the variable consideration components are resolved and revenue amounts are known at the time of recognition. We have determined that the above methods represent a faithful depiction of delivering a service to the customer. Revenues are typically billed and consideration received monthly, however, certain deficiency fees related to MVCs are billed quarterly or annually.

Disaggregation of Revenue

The following is a summary of revenues disaggregated by segment:

	Year Ended December 31,
	2024		2023		2022
	(millions)
Pipeline (a)	$	443	$	377	$	339
Gathering	538		545		581
Total operating revenues	$	981	$	922	$	920

__________________________________

(a) Includes revenues outside the scope of ASC 606 primarily related to contracts accounted for as leases of $9 million, $7 million and $10 million for the years ended December 31, 2024, 2023 and 2022, respectively.

Nature of Services

We primarily provide two types of revenue services: firm service and interruptible service. Firm service revenue contracts provide for fixed revenue commitments regardless of actual volumes of natural gas that flow, which leads to more stable operating performance, revenues and cash flows and limits our exposure to natural gas price fluctuations. Firm service revenue contracts are typically long-term and structured using fixed demand charges or MVCs with fixed deficiency fee rates. Contracts structured using fixed demand charges contain a performance obligation of a stand-ready series of distinct services that are substantially the same with the same pattern of transfer to the customer, therefore revenue is recognized ratably over time. Contracts structured using MVCs with fixed deficiency fee rates require customers to transport or store a minimum volume of natural gas over a specified time period. If a customer fails to meet its MVCs for the specified time period, the contract consideration includes a fixed rate for the actual volumes gathered, transported or stored, and a deficiency fee for the shortfall between the MVCs and the actual volumes gathered, transported, or stored. If a customer exceeds its MVC for the specified time period, the contract consideration is based on fixed rates for the actual volumes gathered, transported, or stored. The contract consideration is allocated to each distinct monthly performance obligation, consistent with the allocation objective and based upon the level of effort required to satisfy the service obligation. Revenues are generally recognized over time based on the output measure of natural gas volumes gathered, transported, or stored, with the recognition of the deficiency fee revenue in the period when it is known the customer cannot make up the deficient volumes in the specified time period. Interruptible service revenue contracts typically contain fixed rates, with total consideration dependent on actual natural gas volumes that flow. Interruptible service revenues are recognized over time based on the output measure of natural gas volumes gathered, transported, or stored. Certain of our gathering contracts allow for the recovery of production-related operating expenses, which are offsetting in revenue and operating expense. Recovery of production-related operating expenses were $51 million, $53 million and $65 million for the years ended December 31, 2024, 2023 and 2022, respectively.

Contract Liabilities

The following is a summary of contract liability activity:

	2024		2023
	(millions)
Balance as of January 1	$	129	$	32
Increases due to cash received or receivable, excluding amounts recognized as revenue during the period (a)	47		101
Revenue recognized that was included in the balance at the beginning of the period	(23)		(4)
Balance as of December 31	$	153	$	129

__________________________________

(a) During the year ended December 31, 2024 and 2023, we collected prepayment amounts from customers under various long-term revenue contracts on Ohio Utica Gathering, Appalachia Gathering, Blue Union Gathering and LEAP.

Contract liabilities generally represent amounts paid by or receivable from customers for which the associated performance obligation has not yet been satisfied. Contract liabilities associated with these services are recognized upon delivery of the service to the customer.    

The following table presents contract liability amounts as of December 31, 2024 that are expected to be recognized as revenue in future periods:

	(millions)
2025	$	18
2026	18
2027	18
2028	16
2029	16
2030 and thereafter	67
Total	$	153

Transaction Price Allocated to the Remaining Performance Obligations

In accordance with optional exemptions available under ASC 606, we do not disclose the value of unsatisfied performance obligations for (1) contracts with an original expected length of one year or less, (2) with the exception of fixed consideration, contracts for which the amount of revenue recognized depends upon our invoices for actual volumes gathered, transported, or stored, and (3) contracts for which variable consideration relates entirely to an unsatisfied performance obligation.

Such contracts consist of various types of performance obligations, including providing midstream services. Contracts with variable volumes and/or variable pricing, including those with pricing provisions tied to a consumer price or other index, have also been excluded as the related contract consideration is variable at the contract inception. Contract lengths vary from cancellable to multi-year.

The following table presents revenue amounts related to fixed consideration associated with unsatisfied performance obligations as of December 31, 2024 that are expected to be recognized as revenue in future periods:

	(millions)
2025	$	265
2026	223
2027	226
2028	181
2029	149
2030 and thereafter	268
Total	$	1,312

Costs to Obtain or Fulfill a Contract

We recognize an asset from the costs incurred to obtain a revenue contract only if we expect to recover those costs. In addition, the costs to fulfill a revenue contract are capitalized if the costs are specifically identifiable to a revenue contract, would result in enhancing resources that will be used in satisfying performance obligations in the future, and are expected to be recovered. These capitalized costs are amortized on a systematic basis consistent with the pattern of transfer of the services to which such costs relate.

As of December 31, 2024 and 2023, we had capitalized costs to obtain or fulfill a contract of $18 million, which are included in other current assets and other noncurrent assets in the accompanying Consolidated Statements of Financial Position. During the years ended December 31, 2024, 2023 and 2022 we recognized $1 million of amortization expense related to such capitalized costs.

Major Customers

The following table summarizes the customer which represents 10% or more of our total revenue for the years ended December 31, 2024, 2023 and 2022. Both Pipeline and Gathering segments provided services to this customer.

	2024				2023				2022
	Customer		Percentage		Customer		Percentage		Customer		Percentage
	Revenue		of Total		Revenue		of Total		Revenue		of Total
Customer:	(millions, except percentages)
Expand Energy	$	555	56	%	$	560	60	%	$	596	65	%

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GOODWILL

12 Months Ended

Dec. 31, 2024

Goodwill and Intangible Assets Disclosure [Abstract]

GOODWILL

GOODWILL

We have goodwill that resulted from business combinations. The carrying value of goodwill is evaluated for impairment on an annual basis or whenever events or circumstances indicate that the value of goodwill may be impaired. We performed our annual impairment test as of October 1, 2024 and determined that the estimated fair value of each reporting unit exceeded its carrying value, and no impairment existed. We recognized goodwill as of December 31, 2024 as part of the Midwest Pipeline Acquisition in the Pipeline reporting unit. See Note 16, "Acquisitions" to the Consolidated Financial Statements.

The following is the summary of the change in the carrying amount of goodwill:

	2024		2023
	(millions)
Balance at January 1	$	473	$	473
Goodwill attributable to the Midwest Pipeline Acquisition	303		—
Balance at December 31	$	776	$	473

The following is a summary of the carrying value of goodwill by reporting unit:

	December 31,
	2024		2023
	(millions)
Pipeline	$	356	$	53
Gathering	420		420
Total goodwill	$	776	$	473

While we believe the estimates and assumptions in the estimated fair value are reasonable, the actual results may differ from projections. To the extent projected results or cash flows are revised downward, the reporting unit may be required to write down all or a portion of its goodwill, which would adversely impact our earnings.

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PROPERTY, PLANT, AND EQUIPMENT AND INTANGIBLE ASSETS

12 Months Ended

Dec. 31, 2024

Property, Plant and Equipment [Abstract]

PROPERTY, PLANT, AND EQUIPMENT AND INTANGIBLE ASSETS

PROPERTY, PLANT, AND EQUIPMENT AND INTANGIBLE ASSETS

Property, Plant, and Equipment

The following is a summary of Property, plant, and equipment by classification:

	Average Estimated Useful Life	December 31,
		2024		2023
	(years)	(millions)
Property, plant, and equipment
Land and other non-depreciable assets	N/A	$	105	$	96
Rights of way and easements	25 to 53	168		103
Pipelines and interconnects	10 to 95	4,437		3,460
Facilities and processing plants	7 to 50	1,364		1,234
Wells and well equipment	40 to 70	70		70
General plant	3 to 40	60		40
Construction in progress	N/A	321		279
Total Property, plant, and equipment		$	6,525	$	5,282
Less accumulated depreciation		(998)		(848)
Net Property, plant, and equipment		$	5,527	$	4,434

Intangible Assets

The following is a summary of Intangible Assets by classification:

		December 31, 2024						December 31, 2023
	Useful Lives	Gross Carrying Value		Accumulated Amortization		Net Carrying Value		Gross Carrying Value		Accumulated Amortization		Net Carrying Value
		(millions)
Intangible assets subject to amortization
Customer relationships	3 - 40 years (a)	$	2,262	$	(345)	$	1,917	$	2,252	$	(289)	$	1,963
Contract intangibles	14 - 26 years	18		(14)		4		18		(13)		5
Total		$	2,280	$	(359)	$	1,921	$	2,270	$	(302)	$	1,968

_____________________________________

(a) The useful lives of the customer relationship intangible assets are based on the number of years in which the assets are expected to economically contribute to the business. The expected economic benefit incorporates existing customer contracts and expected renewal rates based on the estimated volume and production lives of natural gas resources in each region.

The following table summarizes estimated customer relationships and contract intangibles amortization expense to be recognized during each year through 2029:

	2025		2026		2027		2028		2029
	(millions)
Estimated amortization expense	$	60	$	60	$	60	$	59	$	59

Depreciation and Amortization

The following is a summary of depreciation and amortization expense by asset type:

	Year Ended December 31,
	2024		2023		2022
	(millions)
Property, plant, and equipment	$	152	$	125	$	113
Customer relationships and other intangible assets, net	57		57		57
Total Depreciation and amortization	$	209	$	182	$	170

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INCOME TAXES

12 Months Ended

Dec. 31, 2024

Income Tax Disclosure [Abstract]

INCOME TAXES

INCOME TAXES

Significant Accounting Policy – Accounting for Income Taxes

We record the effect of income taxes in accordance with GAAP, which provides for the use of an asset and liability approach. Deferred income tax assets and liabilities are recognized for temporary differences between the basis of assets and liabilities for financial reporting and tax purposes and measured using enacted tax rates in effect for the year in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities as a result of changes in the enacted tax rates is recognized in earnings in the period of enactment. Our recognition of deferred tax assets is based upon a more-likely-than-not criterion. We routinely assess realizability based on objectively-weighted, available positive and negative evidence.

We account for uncertainties in income taxes using a benefit recognition model with a two-step approach: a more-likely-than-not recognition criterion, and a measurement attribute that measures the position as the largest amount of tax benefit that is greater than a 50% likelihood of being realized upon ultimate settlement. If the benefit does not meet the more likely than not criteria for being sustained on its technical merits, no benefit will be recorded. Uncertain tax positions that relate only to timing of when an item is included on a tax return are considered to have met the recognition threshold.

Midwest Pipeline Acquisition

The Midwest Pipeline Acquisition was treated as a deemed asset acquisition which was taxable for federal and state income tax purposes as a result of 1) making tax elections promulgated under Internal Revenue Code §338(h)(10) for the acquired entities which were treated as corporations under Subchapter C of the Internal Revenue Code, and 2) all single member Limited Liability Companies ("LLC") being treated as disregarded entities for income tax purposes. Accordingly, the majority of deferred income tax assets and liabilities of the acquired entities are eliminated as the tax bases were increased to fair market value which equals net book value. The election resulted in tax-deductible goodwill which is subject to revision during the one-year period as additional information is obtained about facts and circumstances that existed at closing and purchase price allocations are completed/reported on income tax returns.

As a result of changes to the expected state apportionment factors and rates due to the Midwest Pipeline Acquisition, the Company recorded a remeasurement to increase the existing deferred income tax liabilities of DT Midstream (acquiring entity) by $22 million which was charged to income tax expense. See Note 16, "Acquisitions" to the Consolidated Financial Statements.

Tax Legislation

On December 4, 2024, the State of Louisiana enacted a series of tax bills aimed at overall tax reform across multiple state tax regimes including income, franchise, and sales and use. House Bill 2 imposes a flat 5.5% (previously tiered from 3.5% to 7.5%) corporate income tax rate beginning January 1, 2025. In accordance with tax accounting guidance, DT Midstream recorded the remeasurement as a deferred income tax benefit of $4 million. Other enacted law changes include the repeal of the Louisiana franchise tax and increased state sales and use tax rates, which will take effect in future years and are not expected to have a material impact on the financial statements.

On July 8, 2022, the Commonwealth of Pennsylvania enacted House Bill 1342 which includes a corporate income tax rate reduction from 9.99% to 4.99% that will phase-in over a nine-year period.

Our total Income Tax Expense varied from the statutory federal income tax rate for the following reasons:

	Year Ended December 31,
	2024			2023			2022
	(millions)
Income Before Income Taxes	$	504		$	500		$	482
Income tax expense at statutory rate	106			105			101
State and local income taxes, net of federal benefit	18			18			24
State tax rate changes	15			(18)			(25)
Other, net	(2)			(1)			—
Income Tax Expense	$	137		$	104		$	100
Effective income tax rate	27.3		%	20.9		%	20.7		%

The State tax rate changes line in the table above includes state deferred remeasurements recorded in each of the respective years discussed below.

Our 2024 effective tax rate includes a $15 million expense driven by updates to state rates and apportionment factors, primarily related to the Midwest Pipeline Acquisition and tax legislation, as discussed above.

Our 2023 effective tax rate includes the impact of state tax rate changes of an $18 million benefit driven by changes in tax status and updates to state apportionment which were completed in 2023 as a part of ongoing corporate tax structuring, simplification initiatives, and initial post-separation full-year tax return filings.

Our 2022 effective tax rate includes the impact of state tax rate changes of a $25 million benefit driven by the Pennsylvania legislative changes.

Components of Income tax expense were as follows:

	Year Ended December 31,
	2024		2023		2022
	(millions)
Current income tax expense
Federal	$	13	$	(4)	$	16
State and other income tax	4		(2)		14
Total current income tax expense	17		(6)		30
Deferred income tax expense
Federal	84		109		86
State and other income tax	36		1		(16)
Total deferred income tax expense	120		110		70
Total Income Tax Expense	$	137	$	104	$	100

Deferred tax assets and liabilities are recognized for the estimated future tax effect of temporary differences between the tax basis of assets or liabilities and the reported amounts in our Consolidated Financial Statements. We believe it is more likely than not that we will generate sufficient taxable income in future periods to realize our deferred tax assets.

Deferred tax assets (liabilities) were comprised of the following:

	December 31,
	2024		2023
	(millions)
Deferred income tax balance components
Property, plant, and equipment	$	(369)	$	(369)
Federal net operating loss carry-forward	117		184
State and local net operating loss carry-forward, net of federal	75		102
Investment in equity method investees and partnerships	(970)		(979)
Other	18		31
Net deferred income tax asset / (liability)	$	(1,129)	$	(1,031)
Total deferred income tax assets and liabilities
Deferred income tax assets	$	266	$	319
Deferred income tax liabilities	(1,395)		(1,350)
Net deferred income tax asset / (liability)	$	(1,129)	$	(1,031)

We have recorded a deferred tax asset related to a federal net operating loss carry-forward of $117 million as of December 31, 2024. U.S. federal net operating losses will be available to be carried forward indefinitely and available to offset 80% of taxable income in future years.

We have recorded state and local deferred tax assets related to net operating loss carry-forwards of $75 million as of December 31, 2024. Of the state and local net operating loss carry-forwards, $70 million can be carried indefinitely and $5 million will expire from 2033 through 2042 and are available to offset varying amounts of taxable income in future years.

Uncertain Tax Positions

As of December 31, 2024 and 2023, we did not have any unrecognized tax benefits. Our income tax returns remain subject to examination by federal, state, and local taxing jurisdiction

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EARNINGS PER SHARE AND DIVIDENDS

12 Months Ended

Dec. 31, 2024

Earnings Per Share [Abstract]

EARNINGS PER SHARE AND DIVIDENDS

EARNINGS PER SHARE AND DIVIDENDS

Basic earnings per share is calculated by dividing Net Income attributable to DT Midstream by the weighted-average number of common shares outstanding during the period. Diluted earnings per share reflect the dilution that would occur if any potentially dilutive instruments were exercised or converted into common shares, using the treasury stock method. Restricted stock units and performance share awards, including dividend equivalents on those grants, are potentially dilutive and, if dilutive, are included in the determination of weighted-average shares outstanding. Restricted stock units and performance share awards do not receive cash dividends, as such, these awards are not considered participating securities.

In November 2024, we issued 4,168,750 common shares at a price to the public of $101.00 per share and received net proceeds of approximately $406 million in anticipation of the Midwest Pipeline Acquisition. See Note 16, "Acquisitions" to the Consolidated Financial Statements.

The following is a reconciliation of basic and diluted earnings per share:

	Year Ended December 31,
	2024		2023		2022
	(millions, except per share amounts)
Basic and Diluted Earnings per Common Share
Net Income Attributable to DT Midstream	$	354	$	384	$	370
Average number of common shares outstanding — basic	97.6		96.9		96.7
Incremental shares attributable to:
Average dilutive restricted stock units and performance share awards	0.8		0.6		0.5
Average number of common shares outstanding — diluted	98.4		97.5		97.2
Basic Earnings per Common Share	$	3.63	$	3.97	$	3.83
Diluted Earnings per Common Share	$	3.60	$	3.94	$	3.81

We declared the following cash dividends:

Dividends Declared	Dividend Amount				Dividend Payment Date
(quarter ended)	(per-share)		(millions)
2022
March 31	$	0.64	$	62	April 2022
June 30	$	0.64	$	62	July 2022
September 30	$	0.64	$	62	October 2022
December 31	$	0.64	$	62	January 2023
2023
March 31	$	0.69	$	67	April 2023
June 30	$	0.69	$	67	July 2023
September 30	$	0.69	$	67	October 2023
December 31	$	0.69	$	67	January 2024
2024
March 31	$	0.735	$	71	April 2024
June 30	$	0.735	$	71	July 2024
September 30	$	0.735	$	71	October 2024
December 31	$	0.735	$	75	January 2025

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FAIR VALUE

12 Months Ended

Dec. 31, 2024

Fair Value Disclosures [Abstract]

FAIR VALUE

FAIR VALUE

Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date in a principal or most advantageous market. Fair value is a market-based measurement that is determined based on inputs, which refer broadly to assumptions that market participants use in pricing assets or liabilities. These inputs can be readily observable, market corroborated, or generally unobservable inputs. We make certain assumptions we believe that market participants would use in pricing assets or liabilities, including assumptions about risk, and the risks inherent in the inputs to valuation techniques. We believe we use valuation techniques that maximize the use of observable market-based inputs and minimize the use of unobservable inputs.

Significant Accounting Policy – Fair Value

A fair value hierarchy has been established that prioritizes the inputs to valuation techniques used to measure fair value in three broad levels. The fair value hierarchy gives the highest priority to quoted prices (unadjusted) in active markets for identical assets or liabilities (Level 1) and the lowest priority to unobservable inputs (Level 3). In some cases, the inputs used to measure fair value might fall in different levels of the fair value hierarchy. All assets and liabilities are required to be classified in their entirety based on the lowest level of input that is significant to the fair value measurement in its entirety. Assessing the significance of a particular input may require judgment considering factors specific to the asset or liability and may affect the valuation of the asset or liability and its placement within the fair value hierarchy. We classify fair value balances based on the fair value hierarchy defined as follows:

•Level 1 — Consists of unadjusted quoted prices in active markets for identical assets or liabilities that we have the ability to access as of the reporting date.

•Level 2 — Consists of inputs other than quoted prices included within Level 1 that are directly observable for the assets or liabilities or indirectly observable through corroboration with observable market data.

•Level 3 — Consists of unobservable inputs for assets or liabilities whose fair value is estimated based on internally developed models or methodologies using inputs that are generally less readily observable and supported by little, if any, market activity at the measurement date. Unobservable inputs are developed based on the best available information and subject to cost-benefit constraints.

Fair Value of Financial Instruments

The following table presents the carrying amount and fair value of financial instruments:

	December 31, 2024								December 31, 2023
	Carrying		Fair Value						Carrying		Fair Value
	Amount		Level 1		Level 2		Level 3		Amount		Level 1		Level 2		Level 3
	(millions)
Cash equivalents (a)	$	—	$	—	$	—	$	—	$	36	$	—	$	36	$	—
Long-term notes receivable — related party	4		—		—		4		4		—		—		4
Short-term borrowings (a)	150		—		150		—		165		—		165		—
Long-term debt (b)	$	3,319	$	—	$	3,136	$	—	$	3,065	$	—	$	2,850	$	—

______________________________________

(a)Short-term borrowings and money market cash equivalents are stated at cost, which approximates fair value.

(b)Carrying value as of December 31, 2024 and 2023 represents principal of $3.4 billion and $3.1 billion, respectively, net of unamortized debt discounts and issuance costs.

On December 31, 2024, we closed on the Midwest Pipeline Acquisition, and assets acquired and liabilities assumed were measured at estimated fair value. See Note 16, "Acquisitions" to the Consolidated Financial Statements.

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DEBT

12 Months Ended

Dec. 31, 2024

Debt Disclosure [Abstract]

DEBT

DEBT

Amendments to Credit Agreement

In December 2024, we amended our Credit Agreement to, among other things, extend the Revolving Credit Facility maturity date to December 2029 and implement customary "limited condition transaction provisions", enabling us to enter into future acquisitions and other transactions with the conditionality to the consummation thereof subject only to customary "SunGard" conditions, which provide additional financing certainty and reduce the number of conditions required. In November 2024, we amended our Credit Agreement to permit the Company to incur certain customary bridge loans, including the Bridge Facility, a $700 million 364-day bridge loan facility committed by Barclays Bank PLC, which provided certain backstop funding for our Midwest Pipeline Acquisition. Bridge Facility issuance fees of $4 million were incurred during the year ended December 31, 2024 and recorded as interest expense on our Consolidated Statements of Operations.

In June 2023, we amended our Credit Agreement which modified certain of the terms, including, among other things, the replacement of the interest rate provisions related to the Term Loan Facility from Eurodollar Rate to Term SOFR (as defined in the Credit Agreement).

In October 2022, we amended the Credit Agreement to increase the Revolving Credit Facility commitments by $250 million to aggregate commitments of $1.0 billion. The amendment also extended the Revolving Credit Facility maturity date to October 2027, replaced the Revolving Credit Facility's LIBOR interest rate references with Term SOFR, and incorporated various amendments, including amendments to pricing, guarantee and collateral provisions, that will become effective if we receive an investment-grade rating from two of the three credit rating agencies.

Debt Issuances

In November 2024, we issued $650 million in aggregate principal amount of 5.800% senior secured notes due December 2034. The 2034 Notes are guaranteed by certain of our subsidiaries and secured by a first priority lien on certain assets of DT Midstream and our subsidiary guarantors that secure our existing credit facilities. As part of the issuance of the 2034 Notes, we capitalized debt issuance costs and discount costs of approximately $5 million and $1 million, respectively.

In April 2022, we issued $600 million in aggregate principal amount of 4.300% senior secured notes due April 2032. The 2032 Notes are guaranteed by certain of our subsidiaries and secured by a first priority lien on certain assets of DT Midstream and our subsidiary guarantors that secure our existing credit facilities. The 2032 Notes have a security fall away provision where the collateral securing the notes will be released if we receive an investment-grade rating from two of the three credit rating agencies.

Debt Redemptions

In September 2024, we repaid the remaining indebtedness under the Term Loan Facility of $399 million. The early redemption resulted in a loss on extinguishment of debt of $4 million related to the write-off of unamortized discount and issuance costs, which was recorded as a loss from financing activities on our Consolidated Statements of Operations for the year ended December 31, 2024. There were no prepayment costs in conjunction with the early redemption of the Term Loan Facility.

In April 2022, we used $593 million of the net proceeds from the sale of the 2032 Notes to make a partial repayment on the existing indebtedness under the Term Loan Facility. The early redemption resulted in a loss on extinguishment of debt of $9 million and loss on modification of debt of $4 million related to the write-off of unamortized discount and issuance costs, which was recorded as a loss from financing activities in our Consolidated Statements of Operations for the year ended December 31, 2022. There were no prepayment costs in conjunction with the partial redemption of the Term Loan Facility.

Interest Expense

The following table summarizes our interest expense:

	Year Ended December 31,
	2024		2023		2022
	(millions)
Interest expense	$	163	$	170	$	142
Capitalized interest	(10)		(20)		(5)
Total interest expense, net	$	153	$	150	$	137

Long-Term Debt

The following is a summary of long-term debt:

			Maturity	December 31,		December 31,
Title	Type	Interest Rate	Date	2024		2023
				(millions)
2029 Notes	Senior Notes (a)	4.125%	2029	$	1,100	$	1,100
2031 Notes	Senior Notes (a)	4.375%	2031	1,000		1,000
2032 Notes	Senior Secured Notes (b)	4.300%	2032	600		600
2034 Notes	Senior Secured Notes (a)	5.800%	2034	650		—
Term Loan Facility	Term Loan Facility	Variable	2028	—		399
Long-term debt principal				3,350		3,099
Unamortized debt discount				(1)		(2)
Unamortized debt issuance costs				(30)		(32)
Long-term debt, net				$	3,319	$	3,065

______________________________

(a) Interest payable semi-annually in arrears each June 15 and December 15. The first interest payment due on the 2034 Notes is June 15, 2025.

(b) Interest payable semi-annually in arrears each April 15 and October 15.

The following table presents scheduled debt maturities, excluding any unamortized discount on debt:

		2025		2026	2027	2028	2029 and Thereafter	Total
	(millions)
Debt maturities		$	—	—	—	—	3,350	$	3,350

Short-Term Credit Arrangements and Borrowings

The following table presents the availability under the Revolving Credit Facility:

	December 31,
	2024
	(millions)
Total availability
Revolving Credit Facility, expiring December 2029	$	1,000
Amounts outstanding
Revolving Credit Facility borrowings (a)	150
Letters of credit	16
	166
Net availability	$	834

______________________________

(a) The weighted average interest rate for Revolving Credit Facility borrowings outstanding was 4.34% as of December 31, 2024.

Borrowings under the Revolving Credit Facility, if any, are used for general corporate purposes, acquisitions, and letter of credit issuances to support our operations and liquidity. The 2024 amendment costs of the Revolving Credit Facility of $3 million were capitalized during the year ended December 31, 2024. Revolving Credit Facility issuance and amendment costs, net of amortization, of $7 million and $6 million as of December 31, 2024 and 2023, respectively, are included in other noncurrent assets in our Consolidated Statements of Financial Position and are being amortized over the remaining term of the Revolving Credit Facility.

The Credit Agreement covering the Revolving Credit Facility includes financial covenants that we must maintain. These covenants restrict the ability of DT Midstream and our subsidiaries to incur additional indebtedness and guarantee indebtedness, create or incur liens, engage in mergers, consolidations, liquidations or dissolutions, sell, transfer or otherwise dispose of assets, make investments, acquisitions, loans or advances, pay dividends and distributions or repurchase capital stock, prepay, redeem or repurchase certain junior indebtedness, enter into agreements that limit the ability of the restricted subsidiaries to make distributions to DT Midstream or the ability of DT Midstream and our restricted subsidiaries to incur liens on assets and enter into certain transactions with affiliates. The Revolving Credit Facility requires maintenance of (i) a maximum consolidated net leverage ratio of 5 to 1 (except, that the Company may elect to temporarily step up the maximum consolidated net leverage ratio to 5.5 to 1 for a period of up to three fiscal quarters after the consummation of an acquisition or investment involving consideration exceeding $50 million), and (ii) a minimum interest coverage ratio of no less than 2.5 to 1. The consolidated net leverage ratio means the ratio of net debt determined in accordance with GAAP to annual consolidated EBITDA, as defined in the Credit Agreement. The interest coverage ratio means the ratio of annual consolidated EBITDA to annual interest expense, as defined in the Credit Agreement. The Credit Agreement definition of annual consolidated EBITDA excludes EBITDA from equity method investees, but includes dividends and distributions from equity method investees. As of December 31, 2024, the consolidated net leverage ratio and the interest coverage ratio were 2.3 to 1 and 9.3 to 1, respectively, and we were in compliance with these financial covenants.

Dividend Restrictions

The indentures governing our Senior and Senior Secured Notes permit the payment of quarterly dividends on common stock in each fiscal year up to a dividend capacity calculated as defined in the indentures. For 2024, the dividend capacity remaining at year end was $537 million.

The Credit Agreement permits the payment of quarterly dividends on common stock in each fiscal year as long as giving pro forma effect thereto, we maintain a first lien net leverage ratio that does not exceed 3.25 to 1. We maintained such first lien net leverage ratio as of December 31, 2024.

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LEASES

12 Months Ended

Dec. 31, 2024

Leases [Abstract]

LEASES

LEASES

Lessee

Our leases are primarily comprised of equipment and buildings with terms ranging from approximately 1 to 11 years.

A lease exists when we have the right to control the use of identified property, plant or equipment, as conveyed through a contract, for a certain time period and consideration paid. The right to control is deemed to occur when we have the right to obtain substantially all of the economic benefits of the identified assets and the right to direct the use of such assets.

Significant Accounting Policy – Lessee Accounting

Lease liabilities are calculated utilizing a discount rate to determine the present values of lease payments. GAAP requires the use of the rate implicit in the lease if it is readily determinable. When the rate implicit in the lease is not readily determinable, the incremental borrowing rate is used. The incremental borrowing rate is based upon the rate of interest that would have been paid on a collateralized basis over similar contract terms to that of the leases. The incremental borrowing rates have been determined utilizing an implied secured borrowing rate based upon an unsecured rate for a similar time period of remaining lease terms, which is then adjusted for the estimated impact of collateral. We have leases with non-index-based escalation clauses for fixed dollar or percentage increases over the contract term.

We have certain leases which contain purchase options. Based upon the nature of the leased property and terms of the purchase options, we have determined it is not reasonably certain that such purchase options will be exercised. Thus, the impact of the purchase options has not been included in the determination of right-of-use assets and lease liabilities for the subject leases.

We have certain leases which contain renewal options. Where the renewal options were deemed reasonably certain to occur, the impacts of such options were included in the determination of the right-of-use assets and lease liabilities for the subject leases.

We have agreements with lease and non-lease components, which are generally accounted for separately. Consideration in a lease is allocated between lease and non-lease components based upon the estimated relative standalone prices.

The components of lease cost for the following years includes:

	Year Ended December 31,
	2024		2023		2022
	(millions)
Operating lease cost	$	21	$	20	$	20
Short-term lease cost	3		3		3
	$	24	$	23	$	23

Operating lease cost includes amortization of operating lease right-of-use assets and other related costs. We have elected not to apply the lease balance sheet recognition requirements to short-term leases with a term of 12 months or less. Operating and short-term lease costs are recorded to operation and maintenance in our Consolidated Statements of Operations.

Other relevant information related to leases for the following years includes:

	Year Ended December 31,
	2024			2023			2022
Supplemental Cash Flows Information	(millions, except years and percentages)
Cash paid for amounts included in the measurement of these liabilities:
Operating cash flows for operating leases	$	21		$	21		$	18
Right-of-use assets obtained in exchange for lease obligations:
Operating leases	$	29		$	25		$	14
Weighted Average Remaining Lease Term
Operating leases	3.9 years			4.4 years			4.0 years
Weighted Average Discount Rate
Operating leases	5.3		%	4.8		%	3.5		%

Future minimum lease payments under leases for remaining periods as of December 31, 2024 are as follows:

	Operating Leases
	(millions)
2025	$	17
2026	15
2027	14
2028	6
2029	2
2030 and thereafter	3
Total future minimum lease payments	57
Imputed interest	(5)
Lease liabilities	$	52

Lessor

A lease exists when we have provided other parties with the right to control the use of identified property, plant or equipment, as conveyed through a contract, for a certain time period and consideration received. The right to control is deemed to occur when we have provided other parties with the right to obtain substantially all of the economic benefits of the identified assets and the right to direct the use of such assets.

We lease certain assets under an operating lease for a pipeline which commenced in December 2018. The lease is comprised of fixed payments with a remaining term of 14 years. The operating lease does not have renewal provisions or options to purchase the assets at the end of the lease and does not have termination for convenience provisions. The lease term extends to the end of the estimated economic life of the leased assets, thereby resulting in no residual value.

As part of the Midwest Pipeline Acquisition, one pipeline has agreements with a customer and its subsidiaries that results in the use of substantially all the pipeline's capacity through 2026 and represents an operating lease.

Fixed lease income associated with the operating lease was $9 million, $7 million, and $10 million for the years ended December 31, 2024, 2023 and 2022, respectively. Fixed lease income is reported in Operating revenues in our Consolidated Statements of Operations. Depreciation expense associated with the property under the operating lease was $3 million for each of the years ended December 31, 2024, 2023 and 2022.

Future minimum rental revenues for remaining periods as of December 31, 2024 are as follows:

	Operating Lease
	(millions)
2025	$	77
2026	62
2027	9
2028	9
2029	9
2030 and thereafter	79
Total future minimum rental revenues	$	245

Property under the operating lease is as follows:

	December 31,
	2024		2023
	(millions)
Gross property under operating leases	$	484	$	58
Accumulated amortization of property under operating leases	$	17	$	15

LEASES

LEASES

Lessee

Our leases are primarily comprised of equipment and buildings with terms ranging from approximately 1 to 11 years.

A lease exists when we have the right to control the use of identified property, plant or equipment, as conveyed through a contract, for a certain time period and consideration paid. The right to control is deemed to occur when we have the right to obtain substantially all of the economic benefits of the identified assets and the right to direct the use of such assets.

Significant Accounting Policy – Lessee Accounting

Lease liabilities are calculated utilizing a discount rate to determine the present values of lease payments. GAAP requires the use of the rate implicit in the lease if it is readily determinable. When the rate implicit in the lease is not readily determinable, the incremental borrowing rate is used. The incremental borrowing rate is based upon the rate of interest that would have been paid on a collateralized basis over similar contract terms to that of the leases. The incremental borrowing rates have been determined utilizing an implied secured borrowing rate based upon an unsecured rate for a similar time period of remaining lease terms, which is then adjusted for the estimated impact of collateral. We have leases with non-index-based escalation clauses for fixed dollar or percentage increases over the contract term.

We have certain leases which contain purchase options. Based upon the nature of the leased property and terms of the purchase options, we have determined it is not reasonably certain that such purchase options will be exercised. Thus, the impact of the purchase options has not been included in the determination of right-of-use assets and lease liabilities for the subject leases.

We have certain leases which contain renewal options. Where the renewal options were deemed reasonably certain to occur, the impacts of such options were included in the determination of the right-of-use assets and lease liabilities for the subject leases.

We have agreements with lease and non-lease components, which are generally accounted for separately. Consideration in a lease is allocated between lease and non-lease components based upon the estimated relative standalone prices.

The components of lease cost for the following years includes:

	Year Ended December 31,
	2024		2023		2022
	(millions)
Operating lease cost	$	21	$	20	$	20
Short-term lease cost	3		3		3
	$	24	$	23	$	23

Operating lease cost includes amortization of operating lease right-of-use assets and other related costs. We have elected not to apply the lease balance sheet recognition requirements to short-term leases with a term of 12 months or less. Operating and short-term lease costs are recorded to operation and maintenance in our Consolidated Statements of Operations.

Other relevant information related to leases for the following years includes:

	Year Ended December 31,
	2024			2023			2022
Supplemental Cash Flows Information	(millions, except years and percentages)
Cash paid for amounts included in the measurement of these liabilities:
Operating cash flows for operating leases	$	21		$	21		$	18
Right-of-use assets obtained in exchange for lease obligations:
Operating leases	$	29		$	25		$	14
Weighted Average Remaining Lease Term
Operating leases	3.9 years			4.4 years			4.0 years
Weighted Average Discount Rate
Operating leases	5.3		%	4.8		%	3.5		%

Future minimum lease payments under leases for remaining periods as of December 31, 2024 are as follows:

	Operating Leases
	(millions)
2025	$	17
2026	15
2027	14
2028	6
2029	2
2030 and thereafter	3
Total future minimum lease payments	57
Imputed interest	(5)
Lease liabilities	$	52

Lessor

A lease exists when we have provided other parties with the right to control the use of identified property, plant or equipment, as conveyed through a contract, for a certain time period and consideration received. The right to control is deemed to occur when we have provided other parties with the right to obtain substantially all of the economic benefits of the identified assets and the right to direct the use of such assets.

We lease certain assets under an operating lease for a pipeline which commenced in December 2018. The lease is comprised of fixed payments with a remaining term of 14 years. The operating lease does not have renewal provisions or options to purchase the assets at the end of the lease and does not have termination for convenience provisions. The lease term extends to the end of the estimated economic life of the leased assets, thereby resulting in no residual value.

As part of the Midwest Pipeline Acquisition, one pipeline has agreements with a customer and its subsidiaries that results in the use of substantially all the pipeline's capacity through 2026 and represents an operating lease.

Fixed lease income associated with the operating lease was $9 million, $7 million, and $10 million for the years ended December 31, 2024, 2023 and 2022, respectively. Fixed lease income is reported in Operating revenues in our Consolidated Statements of Operations. Depreciation expense associated with the property under the operating lease was $3 million for each of the years ended December 31, 2024, 2023 and 2022.

Future minimum rental revenues for remaining periods as of December 31, 2024 are as follows:

	Operating Lease
	(millions)
2025	$	77
2026	62
2027	9
2028	9
2029	9
2030 and thereafter	79
Total future minimum rental revenues	$	245

Property under the operating lease is as follows:

	December 31,
	2024		2023
	(millions)
Gross property under operating leases	$	484	$	58
Accumulated amortization of property under operating leases	$	17	$	15

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COMMITMENTS AND CONTINGENCIES

12 Months Ended

Dec. 31, 2024

Commitments and Contingencies Disclosure [Abstract]

COMMITMENTS AND CONTINGENCIES

COMMITMENTS AND CONTINGENCIES

From time to time, we are subject to legal, administrative and environmental proceedings before various courts, arbitration panels and governmental agencies concerning claims arising in the ordinary course of business. These proceedings include certain contract disputes, additional environmental reviews and investigations, audits and pending judicial matters. We cannot predict the final disposition of such proceedings. We regularly review legal matters and record provisions for claims that we can estimate and are considered probable of loss. The amount or range of reasonably possible losses is not anticipated to, either individually or in the aggregate, materially adversely affect our business, financial condition and results of operations.

Guarantees

In certain limited circumstances, we enter into contractual guarantees. We may guarantee another entity's obligation in the event it fails to perform and may provide guarantees in certain indemnification agreements. We did not have any guarantees of other parties' obligations as of December 31, 2024.

Purchase Commitments

As of December 31, 2024, we were party to long-term purchase commitments relating to a variety of goods and services required for our business. We estimate lifetime purchase commitments of approximately $95 million, due in the periods shown below.

	(millions)
2025	$	14
2026	13
2027	12
2028	12
2029	12
2030 and thereafter	32
Total	$	95

Surety Bonds

In certain limited circumstances, we enter into contracts that require us to obtain external surety bonds to secure our payment and performance. We agree to indemnify the issuers of these surety bonds for amounts, if any, paid by them under these agreements. In the event that any surety bonds are called for non-performance, we would be obligated to reimburse the issuer of the surety bond. The maximum potential indemnification under our surety bond agreements as of December 31, 2024 is $30 million.

Vector Line of Credit

We are the lender under a revolving term credit facility to Vector, the borrower, in the amount of CAD $70 million. The credit facility was executed in response to the passage of Canadian regulations requiring oil and gas pipelines to demonstrate their financial ability to respond to a catastrophic event and exists for the sole purpose of satisfying these regulations. Vector may only draw upon the facility if the funds are required to respond to a catastrophic event. The maximum potential payout as of December 31, 2024 is USD $49 million. The funding of a loan under the terms of the revolving term credit facility is considered remote.

Contingent Liability

In order to comply with certain state environmental regulations, we have an obligation to restore pipeline right-of-way slope failures that may arise in the ordinary course of business in the Utica and Marcellus formations. We completed evaluations of all locations, which were prioritized based on the severity and proximity of the slope failures, and used updated cost information to assess the adequacy of the estimate for the contingent liability accrual. Based on these evaluations, we recorded a reduction to the contingent liability accrual and decrease to operation and maintenance expense of $9 million and $6 million during the years ended December 31, 2024 and 2023, respectively. As of December 31, 2024 and 2023, we had accrued contingent liabilities of $3 million and $13 million, respectively, for future slope restoration expenditures. The accrual is included in other current liabilities and other liabilities in the Consolidated Statements of Financial Position. While restoration is ongoing, we believe the accrued amounts are sufficient to cover estimated future expenditures.

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STOCK-BASED COMPENSATION AND DEFINED CONTRIBUTION PLANS

12 Months Ended

Dec. 31, 2024

Share-Based Payment Arrangement [Abstract]

STOCK-BASED COMPENSATION AND DEFINED CONTRIBUTION PLANS

STOCK-BASED COMPENSATION AND DEFINED CONTRIBUTION PLANS

The DT Midstream, Inc. Long-Term Incentive Plan permits the grant of incentive and nonqualified stock options, stock appreciation rights, restricted stock awards and restricted stock units, performance share awards, and performance units to employees, consultants and members of DT Midstream's Board of Directors. As a result of a restricted stock award grant, restricted stock unit or performance share award settlement, or by exercise of a stock option, we may issue common stock from our authorized but unissued common stock and/or from outstanding common stock acquired by or on behalf of DT Midstream in the participant's name. Key provisions of the DT Midstream Plan are:

•Authorized limit as of December 31, 2024 was 8,250,000 shares of common stock. The authorized limit increases annually on January 1 by the lesser of 1,750,000 shares of common stock or the amount determined by the DT Midstream Board of Directors.

•Prohibits the grant of a stock option with an exercise price that is less than the fair market value of DT Midstream's stock on the grant date.

The following table summarizes our stock-based compensation expense and the related income tax benefit:

	Year Ended December 31,
	2024		2023		2022
	(millions)
Stock-based compensation expense	$	23	$	20	$	17
Tax benefit	$	5	$	5	$	4

Restricted Stock Units

Restricted stock units granted under the DT Midstream Plan are for a specified number of shares of DT Midstream common stock that entitle the holder to receive common stock, a cash payment, or a combination thereof at the end of the specified vesting period, which is generally three or four years. Restricted stock units are deemed to be equity awards. The fair value of restricted stock units is based on DT Midstream's closing common stock price on the grant date. The fair value is amortized to stock-based compensation expense using a graded vesting schedule over the vesting period. Restricted stock units are settled with DT Midstream common stock and fractional shares are settled in cash.

During the vesting period, the number of restricted stock units granted will increase, assuming full dividend reinvestment on each dividend payment date. The recipient of a restricted stock unit has no shareholder rights during the vesting period. Restricted stock units are nontransferable and subject to risk of forfeiture during the vesting period. Forfeitures are recognized in the period they occur.

The following table summarizes restricted stock unit activity for the year ended December 31, 2024:

	Restricted Stock Units	Weighted- Average Grant Date Fair Value
	(thousands)	(per share)
Nonvested as of December 31, 2023	417	$	45.82
Granted (a)	152	60.37
Forfeited	(4)	49.35
Vested (b)	(104)	42.40
Nonvested as of December 31, 2024	461	$	51.37

____________________________________

(a)Includes initial grants and dividends reinvested.

(b)Includes vested, not issued shares of two thousand at December 31, 2024. Shares will be issued in first quarter 2025.

The weighted-average grant date fair value of restricted stock units granted, excluding dividends reinvested, during the years ended December 31, 2024, 2023 and 2022 was $62.63, $52.66 and $52.25, respectively. The intrinsic value of restricted stock units vested and issued during the years ended December 31, 2024, 2023 and 2022 was $7 million, $8 million, and $3 million, respectively.

Performance Share Awards

Performance share awards granted under the DT Midstream Plan are for a specified number of shares of DT Midstream common stock that entitle the holder to receive common stock, a cash payment, or a combination thereof at the end of the specified vesting period, which is generally three years. Performance share awards are deemed to be equity awards. Performance share stock-based compensation expense is accrued over the vesting period based on the grant date fair value calculated using: (i) DT Midstream's closing common stock price on the grant date; (ii) the grant date fair value of the market condition; and (iii) the probable achievement of performance objectives. The number of shares issued at settlement is determined based on market conditions and the achievement of certain DT Midstream performance objectives. Performance share awards are settled with DT Midstream common stock and fractional shares are settled in cash.

During the vesting period, the number of performance share awards granted will increase, assuming full dividend reinvestment on each dividend payment date. The recipient of a performance share award has no shareholder rights during the vesting period. Performance share awards are nontransferable and are subject to risk of forfeiture during the vesting period. Forfeitures are recognized in the period they occur.

The following table summarizes performance share award activity for the year ended December 31, 2024:

	Performance Share Awards	Weighted- Average Grant Date Fair Value
	(thousands)	(per share)
Nonvested as of December 31, 2023	557	$	64.36
Granted (a)	372	55.32
Forfeited	(29)	59.66
Settled	(199)	48.12
Nonvested as of December 31, 2024	701	$	64.38

_____________________________________

(a)Includes initial grants, dividends reinvested and shares added for achievement of final performance objectives on settled awards.

The weighted-average grant date fair value of performance share awards granted, excluding dividends reinvested, during the years ended December 31, 2024, 2023 and 2022 was $52.05, $53.74 and $72.91, respectively. The intrinsic value of performance share awards settled during the years ended December 31, 2024, 2023 and 2022 was $10 million, $9 million and $4 million, respectively.

Unrecognized Compensation Costs

As of December 31, 2024, we had $27 million of total unrecognized compensation costs related to non-vested stock incentive plan arrangements. The unrecognized compensation cost is expected to be recognized over a weighted-average period of 1.77 years.

Defined Contribution Plans

We sponsor defined contribution retirement savings plans, and participation in one of these plans is available to substantially all employees. We match employee contributions up to certain predefined and Internal Revenue Service limits based on eligible compensation and each employee's contribution rate, and contribute additional amounts in lieu of traditional pension and post-employment healthcare benefits. DT Midstream's cost for these plans was $7 million, $7 million and $5 million for the years ended December 31, 2024, 2023 and 2022, respectively.

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SEGMENT AND RELATED INFORMATION

12 Months Ended

Dec. 31, 2024

Segment Reporting [Abstract]

SEGMENT AND RELATED INFORMATION

SEGMENT AND RELATED INFORMATION

We set strategic goals, allocate resources, and evaluate performance based on the following two segments: Pipeline and Gathering. Our Chief Operating Decision Maker (CODM) has been identified as our Chief Executive Officer. Our CODM regularly evaluates financial information regarding these segments in deciding how to allocate resources and in assessing our operating and financial performance. We manage and report our operations primarily according to the nature of our products and services. Our plants, pipelines and other fixed assets are located in the U.S. and Canada.

The Pipeline segment owns and operates interstate and intrastate natural gas pipelines, storage systems, and natural gas gathering lateral pipelines. The Pipeline segment also has interests in equity method investees that own and operate interstate natural gas pipelines. The segment is engaged in the transportation and storage of natural gas for intermediate and end user customers. The Midwest Pipeline Acquisition assets are presented in our Pipeline segment as of December 31, 2024. During the three months ended March 31, 2023, we completed the conversion of the Michigan System from gathering to dry gas transmission service and began providing services under a new long-term dry gas transmission contract. For the years ended December 31, 2024 and 2023, the Michigan System financial results are presented in the Pipeline segment. The 2022 comparative activity was for gathering services and therefore was not revised from presentation in the Gathering segment.

The Gathering segment owns and operates gas gathering systems. The segment is engaged in collecting natural gas from points at or near customers’ wells for delivery to plants for treating, to gathering pipelines for further gathering, or to pipelines for transportation, as well as associated ancillary services, including compression, dehydration, gas treatment, water impoundment, water transportation, water disposal, and sand mining. The Clean Fuels Gathering assets and results of operations after the July 1, 2024 acquisition date are presented in our Gathering segment.

Our CODM uses Net Income Attributable to DT Midstream to allocate resources, including employees, property, and financial or capital resources, for each segment predominantly in the annual budget and forecasting process. Our CODM considers budget-to-actual variances on a monthly basis when making decisions about allocating capital and personnel to the segments. The CODM also uses Net Income Attributable to DT Midstream to assess the performance for each segment by comparing the results of each segment. Net Income Attributable to DT Midstream is an important performance measure of the core profitability of our operations and forms the basis of our internal and external financial reporting. We believe that investors benefit from having access to the same financial measures that our management uses in evaluating segment results.

Inter-segment billing for goods and services exchanged between segments is based upon contracted prices of the provider. Inter-segment billings were not significant for the years ended December 31, 2024, 2023 and 2022.

Financial data for our business segments follows:

	Year Ended December 31, 2024
	Pipeline		Gathering		Total Reportable Segments		Eliminations		Total Consolidated
	(millions)
Revenues
Operating revenues	$	443	$	538	$	981	$	—	$	981
Operating Expenses
Operation and maintenance	68		176		244		—		244
Depreciation and amortization	74		135		209		—		209
Taxes other than income	22		17		39		—		39
Other (Income) and Deductions
Interest expense	47		106		153		—		153
Interest income	(4)		(3)		(7)		—		(7)
Earnings from equity method investees	(162)		—		(162)		—		(162)
Loss from financing activities	3		2		5		—		5
Other income	(1)		(3)		(4)		—		(4)
Income Tax Expense	107		30		137		—		137
Less: Net Income Attributable to Noncontrolling Interests	13		—		13		—		13
Net Income Attributable to DT Midstream	$	276	$	78	$	354	$	—	$	354
Capital expenditures	$	73	$	277	$	350	$	—	$	350
Acquisition accounted for as a business combination	$	1,198	$	—	$	1,198	$	—	$	1,198
	December 31, 2024
Investments in equity method investees	$	1,297	$	—	$	1,297	$	—	$	1,297
Goodwill	356		420		776		—		776
Total Assets	$	5,274	$	4,661	$	9,935	$	—	$	9,935

	Year Ended December 31, 2023
	Pipeline		Gathering		Total Reportable Segments		Eliminations		Total Consolidated
	(millions)
Revenues
Operating revenues	$	377	$	545	$	922	$	—	$	922
Operating Expenses
Operation and maintenance	55		190		245		—		245
Depreciation and amortization	69		113		182		—		182
Taxes other than income	15		13		28		—		28
Asset (gains) losses and impairments, net	(4)		—		(4)		—		(4)
Other (Income) and Deductions
Interest expense	55		95		150		—		150
Interest income	(1)		—		(1)		—		(1)
Earnings from equity method investees	(177)		—		(177)		—		(177)
Other income	—		(1)		(1)		—		(1)
Income Tax Expense	75		29		104		—		104
Less: Net Income Attributable to Noncontrolling Interests	12		—		12		—		12
Net Income Attributable to DT Midstream	$	278	$	106	$	384	$	—	$	384
Capital expenditures	$	255	$	517	$	772	$	—	$	772
	December 31, 2023
Investments in equity method investees	$	1,762	$	—	$	1,762	$	—	$	1,762
Goodwill	53		420		473		—		473
Total Assets	$	4,439	$	4,543	$	8,982	$	—	$	8,982

	Year Ended December 31, 2022
	Pipeline		Gathering		Total Reportable Segments		Eliminations		Total Consolidated
	(millions)
Revenues
Operating revenues	$	339	$	581	$	920	$	—	$	920
Operating Expenses
Operation and maintenance	54		213		267		—		267
Depreciation and amortization	63		107		170		—		170
Taxes other than income	14		14		28		—		28
Asset (gains) losses and impairments, net	(6)		(17)		(23)		—		(23)
Other (Income) and Deductions
Interest expense	57		80		137		—		137
Interest income	(1)		(2)		(3)		—		(3)
Earnings from equity method investees	(150)		—		(150)		—		(150)
Loss from financing activities	6		7		13		—		13
Other income	—		(1)		(1)		—		(1)
Income Tax Expense	62		38		100		—		100
Less: Net Income Attributable to Noncontrolling Interests	12		—		12		—		12
Net Income Attributable to DT Midstream	$	228	$	142	$	370	$	—	$	370
Capital expenditures and acquisitions	$	638	$	252	$	890	$	—	$	890
	December 31, 2022
Investments in equity method investees	$	2,200	$	—	$	2,200	$	—	$	2,200
Goodwill	53		420		473		—		473
Total Assets	$	4,625	$	4,208	$	8,833	$	—	$	8,833

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RELATED PARTY TRANSACTIONS

12 Months Ended

Dec. 31, 2024

Related Party Transactions [Abstract]

RELATED PARTY TRANSACTIONS

RELATED PARTY TRANSACTIONS

Transactions between DT Midstream and our equity method investees have been presented as related party transactions in the accompanying Consolidated Financial Statements.

The following is a summary of our balances with related parties:

	December 31,
	2024		2023
	(millions)
Notes receivable from Vector — long-term	$	4	$	4
Current Liabilities — Other	$	1	$	1

DT Midstream had related party transactions presented in Operation and maintenance and Other expense in our Consolidated Statements of Operations during the years ended December 31, 2024, 2023 and 2022 of $2 million, $1 million and $1 million, respectively.

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ACQUISITIONS

12 Months Ended

Dec. 31, 2024

Business Combination, Asset Acquisition, and Joint Venture Formation [Abstract]

ACQUISITIONS

ACQUISITIONS

Clean Fuels Acquisition

On July 1, 2024, DT Midstream closed on the purchase of Clean Fuels Gathering from a privately held coal mine methane producer for purchase consideration of $12 million plus immaterial transaction costs, which was accounted for as an asset acquisition. The Clean Fuels Acquisition was primarily comprised of gathering and treating assets that process coal mine methane into pipeline quality gas which was capitalized as property, plant and equipment. The Clean Fuels Acquisition aligns with our strategy to pursue economically attractive opportunities and deploy GHG reducing technologies and is expected to generate carbon offsets and federal income tax credits. A concurrent gas supply agreement was executed which requires contingent payments from DT Midstream of up to $34 million upon the completion of certain milestones, including cumulative production and income tax credits, and variable payments under a sharing mechanism that could be material. As of December 31, 2024, one milestone had been achieved and $10 million was recorded as a long-term prepaid asset in Other assets and Accounts payable in DT Midstream's Consolidated Statements of Financial Position. The Clean Fuels Gathering assets and results of operations after the July 1, 2024 acquisition date are presented in our Gathering segment.

Midwest Pipeline Acquisition

On December 31, 2024, we closed on the Midwest Pipeline Acquisition of three FERC-regulated natural gas transmission pipelines from ONEOK for a purchase price of $1.2 billion, which is subject to certain customary purchase price adjustments. Under the terms of the agreement, DT Midstream acquired 100% operating ownership in Guardian, Midwestern and Viking. The pipelines have a total capacity of approximately 3.7 Bcf/d and 1,300 miles across seven states in the Midwest market region.

•Guardian Pipeline, L.L.C. is a 263-mile interstate pipeline which connects to the Chicago Hub and serves key Wisconsin demand centers;

•Midwestern Gas Transmission Company is a 402-mile bi-directional interstate pipeline which connects Appalachia supply to the Midwest market region between Tennessee and the Chicago Hub; and

•Viking Gas Transmission Company is a 674-mile bi-directional interstate pipeline which serves key utility customers in Minnesota, Wisconsin and North Dakota.

The Midwest Pipeline Acquisition has potential commercial synergies and it directly aligns with DT Midstream's strategy of owning natural gas assets serving key demand centers and market regions, and with revenues supported by take-or-pay contracts with creditworthy and diverse customers.

The cash consideration provided for the assets acquired was approximately $1.2 billion. The acquisition was accounted for using the acquisition method of accounting for business combinations. Assets acquired and liabilities assumed were measured at estimated fair value at the acquisition date. The FERC-regulated pipelines are subject to rate making and cost recovery provisions and are accounted for under ASC 980 guidance as discussed in Note 17, "Regulatory Matters" to the Consolidated Financial Statements. As such, the fair value of assets acquired and liabilities assumed subject to these provisions approximates their regulated basis, and therefore no fair value adjustments have been reflected related to these amounts.

The intangible assets recorded as a result of the acquisition pertain to existing customer relationships, which were valued at approximately $11 million as of the acquisition date. This fair value was estimated by applying the multi-period excess earnings method, which estimates the value of the intangible asset based upon the present value of the incremental after-tax cash flows solely attributable to the existing customer relationships. The fair value measurement uses significant unobservable inputs, including management estimates and assumptions, and thus represents a fair value Level 3 measurement, pursuant to the applicable accounting guidance. Key estimates and inputs include revenue and expense projections and discount rates based on the risks associated with the intangible assets, and contributory asset charges. The intangible assets are amortized on a straight-line basis over a period of 5 years, which is the number of years the assets are expected to generate incremental after-tax cash flows.

The excess purchase price over the fair value of net assets acquired and liabilities assumed was classified as goodwill. The factors contributing to the recognition of goodwill were based on various strategic benefits that are expected to be realized from the acquisition. The acquisition provides us with a platform for growth and access to further investment opportunities.

For income tax purposes, the transaction is treated as a taxable deemed asset acquisition. Accordingly, the majority of deferred income tax assets and liabilities of the acquired entities are eliminated as the tax bases were increased to fair market value which equals net book value. See Note 7, "Income Taxes" to the Consolidated Financial Statements.

The preliminary allocation of the purchase price is based on estimated fair values of the assets acquired and liabilities assumed at the date of acquisition, December 31, 2024. The purchase price is subject to final working capital settlement adjustments and other potential valuation adjustments during the one year measurement period per the business combination guidance. The components of the preliminary purchase price allocation are as follows:

		December 31,
		2024
		(millions)
Assets
	Accounts receivable	$	29
	Other current assets	10
	Property, plant, and equipment, net	933
	Goodwill	303
	Customer relationship intangible assets	11
	Regulatory assets	10
	Other assets	22
		$	1,318
Liabilities
	Accounts payable	$	12
	Property taxes payable	5
	Other current liabilities	3
	Regulatory liabilities	90
	Other liabilities	10
		$	120
Total cash consideration		$	1,198

DT Midstream incurred approximately $5 million of direct transaction costs for the acquisition during the year ended December 31, 2024. These costs were primarily related to legal and advisory fees and are included in operation and maintenance in DT Midstream's Consolidated Statements of Operations. The Midwest Pipeline Acquisition assets are presented in our Pipeline segment as of December 31, 2024.

Pro forma Financial Information

The Midwest Pipeline Acquisition was completed on December 31, 2024, therefore the acquisition had no impact on our consolidated revenues and earnings for the twelve months ended December 31, 2024. The following unaudited pro forma summary presents our consolidated information as if the acquisition had occurred on January 1, 2023 using our records and seller provided information. The unaudited pro forma financial information does not purport to be indicative of the combined results of operations which would have actually been obtained had the acquisition taken place on January 1, 2023, nor should it be taken as indicative of future consolidated results of operations. The pro forma earnings for the years ended December 31, 2024 and 2023 were adjusted to include net interest expense, after tax, of $11 million and $23 million, respectively, related to the 2034 Senior Notes issued to fund the acquisition offset by the elimination of interest expense on debt held by the acquired pipelines, which was paid off at the acquisition date. Income tax expense of $22 million related to the remeasurement of state deferred income taxes as a result of the acquisition were excluded from the year ended December 31, 2024 and included in the year ended December 31, 2023. Transaction costs, after tax, of $7 million, which includes Bridge Financing fees and legal and professional expenses, were excluded from the year ended December 31, 2024 and included in the year ended December 31, 2023. Other adjustments, after tax, of $1 million and $4 million were included for the years ended December 31, 2024 and 2023, respectively.

	Pro forma (Unaudited)
	Years Ended December 31,
	2024		2023
	(in millions)
Revenue	$	1,182	$	1,091
Net Income attributable to DT Midstream	$	430	$	377

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REGULATORY MATTERS

12 Months Ended

Dec. 31, 2024

Regulated Operations [Abstract]

REGULATORY MATTERS

REGULATORY MATTERS

Significant Accounting Policy – Regulation

Guardian, Midwestern and Viking are subject to rate regulation and accounting requirements of the FERC. The regulated operations of each of these subsidiaries have rates that are (i) established by independent, third-party regulators, (ii) set at levels that will recover our costs when considering the demand and competition for our services and (iii) collectible from our customers. Accordingly, we follow the accounting for regulated operations as defined in ASC 980, Regulated Operations for these pipelines, which results in differences in the application of GAAP between our regulated and non-regulated businesses. During the rate-making process, FERC sets the framework for what we can charge to and collect from our 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. Examples include costs for fuel and losses, contributions in aid of construction, charges for depreciation, gains or losses on disposition of assets and deferral of tax benefits related to changes in tax rates.

Regulatory Assets and Liabilities

Under ASC 980, our regulated operations are required to record regulatory assets and liabilities for certain transactions that would have been treated as revenue or expense in non-regulated businesses. Future regulatory changes could result in changes in the amounts of regulatory assets and liabilities or the discontinuance of this accounting treatment for regulatory assets and liabilities and may require the write-off of the portion of any regulatory asset or liability that is no longer probable of recovery through regulated rates. Actions by regulatory authorities could also have an effect on the amounts we charge to and collect from our customers. Any difference in the amounts recoverable or deferred is recorded as income or expense at the time of regulatory action.

Continued applicability of regulatory accounting treatment requires that rates be designed to recover specific costs of providing regulated services and be charged to and collected from customers. We believe that currently available facts support the continued use of regulatory accounting and that all regulatory assets and liabilities are recoverable or refundable in the current regulatory environment. Regulatory assets are included in Other Assets – Other on our Consolidated Statement of Financial Position.

The following includes balances and descriptions of our regulatory assets and liabilities.

	December 31,
	2024
	(millions)
Regulatory Assets
Recoverable income taxes related to AFUDC equity	$	7
Load Management Services Cost Recovery Mechanism	2
Other regulatory assets	1
	$	10
Regulatory Liabilities
Refundable federal income taxes	$	79
Removal costs liability	11
	$	90

As noted below, certain Regulatory assets for which costs have been incurred were included (or are expected to be included, for costs incurred subsequent to the most recently approved rate case) in the rate base, thereby providing a return on invested costs (except as noted). Certain other Regulatory assets are not included in the rate base but accrue recoverable carrying charges until tariff rates adjusted to collect the assets are billed. Certain Regulatory assets do not result from cash expenditures and therefore do not represent investments included in rate base or have offsetting liabilities that reduce rate base.

Regulatory Assets

•Recoverable income taxes related to AFUDC equity - Accounting standards for income taxes require recognition of a deferred tax liability for the equity component of AFUDC. A Regulatory asset is required for the future increase in taxes payable related to the equity component of AFUDC that will be recovered from customers through future rates over the remaining life of the related property, plant and equipment.

•Load Management Services Cost Recovery Mechanism - The mechanism reconciles the differences between the cost to our pipelines to maintain their line pack gas and the amounts our pipelines receive or pay for such gas to resolve imbalances with customers and pipeline interconnects and as may be otherwise necessary to maintain an appropriate level of line pack for system management purposes. The balance is recovered through an annual update to the LMS tariff rate applied to daily imbalance volumes with counterparties. The recoverable amount is not earning a return or accruing carrying charges.

Liabilities

•Refundable federal income taxes - In December 2017, the Tax Cuts and Jobs Acts ("TCJA") was enacted and reduced the corporate income tax rate, effective January 1, 2018. Guardian, Midwestern and Viking remeasured deferred taxes, resulting in a reduction to deferred tax liabilities, to reflect the impact of the TCJA on the cumulative temporary differences expected to reverse after the effective date. Regulatory liabilities were established for the anticipated return to ratepayers of deferred income taxes through reductions in future rates. The current amount of amortization and method for amortization of each pipeline’s Regulatory liability related to the TCJA tax rate change has been determined in each pipeline’s most recent rate proceedings.

•Removal costs liability - The amounts collected from customers to fund future asset removal activities in excess of removal costs incurred. The annual amount accumulated in this liability is based on rates established in the most recent rate proceedings for each pipeline. The rate is multiplied by the depreciable base for each applicable asset category to calculate the annual amount accumulated in this liability.

Rate Case Settlements

The settlement dates for the most recent FERC rate proceedings for Guardian, Midwestern and Viking were February 15, 2023, May 3, 2022 and July 31, 2024, respectively. As of December 31, 2024, there were no open FERC proceedings for these pipelines.

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SUBSEQUENT EVENT

12 Months Ended

Dec. 31, 2024

Subsequent Events [Abstract]

SUBSEQUENT EVENT

SUBSEQUENT EVENT

Dividend Declaration

On February 26, 2025, we announced that our Board of Directors declared a quarterly dividend of $0.82 per share of common stock. The dividend is payable to our stockholders of record as of March 17, 2025 and is expected to be paid on April 15, 2025.

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Pay vs Performance Disclosure - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Pay vs Performance Disclosure
Net Income Attributable to DT Midstream	$ 354	$ 384	$ 370

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Insider Trading Arrangements	3 Months Ended
	Dec. 31, 2024
Trading Arrangements, by Individual
Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false

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Insider Trading Policies and Procedures	12 Months Ended
	Dec. 31, 2024
Insider Trading Policies and Procedures [Line Items]
Insider Trading Policies and Procedures Adopted	true

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Cybersecurity Risk Management and Strategy Disclosure

12 Months Ended

Dec. 31, 2024

Cybersecurity Risk Management, Strategy, and Governance [Line Items]

Cybersecurity Risk Management Processes for Assessing, Identifying, and Managing Threats [Text Block]

To identify and manage the material risks of cybersecurity threats to our business, operations and control environments, we have made investments in our technology and have implemented policies, programs and controls, with a focus on cybersecurity incident prevention and mitigation. Our cybersecurity program is integrated into our risk management process and is managed by a dedicated cybersecurity team that is responsible for leading enterprise-wide cybersecurity strategy, policy, standards, architecture, and processes. The program is aligned with industry standards and best practices, such as the National Institute of Standards and Technology Cybersecurity Framework. As part of our cybersecurity process, we engage external experts and consultants to assess our cybersecurity program and compliance with applicable practices and standards.

The Company mitigates risks from cybersecurity incidents using a multifaceted approach which includes but is not limited to: establishing information security policies, implementing information protection processes and technologies, assessing cybersecurity risk, implementing cybersecurity training, monitoring our information technology systems, and collaborating with public and private organizations on best practices. The Company is currently in material compliance with relevant information privacy and cybersecurity governmental standards with which it is required to comply.

Cybersecurity Risk Management Processes Integrated [Flag]

true

Cybersecurity Risk Management Processes Integrated [Text Block]

To identify and manage the material risks of cybersecurity threats to our business, operations and control environments, we have made investments in our technology and have implemented policies, programs and controls, with a focus on cybersecurity incident prevention and mitigation. Our cybersecurity program is integrated into our risk management process and is managed by a dedicated cybersecurity team that is responsible for leading enterprise-wide cybersecurity strategy, policy, standards, architecture, and processes. The program is aligned with industry standards and best practices, such as the National Institute of Standards and Technology Cybersecurity Framework. As part of our cybersecurity process, we engage external experts and consultants to assess our cybersecurity program and compliance with applicable practices and standards.

Cybersecurity Risk Management Third Party Engaged [Flag]

true

Cybersecurity Risk Third Party Oversight and Identification Processes [Flag]

true

Cybersecurity Risk Materially Affected or Reasonably Likely to Materially Affect Registrant [Flag]

false

Cybersecurity Risk Board of Directors Oversight [Text Block]

The Company's Board of Directors is engaged in overseeing and reviewing the Company’s strategic direction and objectives, taking into account, among other considerations, the Company’s risk profile and exposures.

Cybersecurity Risk Board Committee or Subcommittee Responsible for Oversight [Text Block]

While the Board of Directors retains oversight over policy and strategy related to cybersecurity, it has delegated the responsibility for the oversight of the Company’s cybersecurity program to the Audit Committee.

Cybersecurity Risk Process for Informing Board Committee or Subcommittee Responsible for Oversight [Text Block]

The Audit Committee is responsible for reviewing and discussing the Company’s policies regarding risk assessment and risk management, major accounting risk exposures and the implementation and effectiveness of risk management protocols with respect to information technology security and cybersecurity risks, as well as reviewing material breaches and attacks, as applicable.

Cybersecurity Risk Role of Management [Text Block]

Our Director of Cybersecurity has over 20 years of relevant experience and is responsible for managing our cybersecurity program and team, which monitors the day-to-day risks using the approach described above. Material near-term and long-term risks are communicated with senior management and the Board of Directors. The Company's Board of Directors is engaged in overseeing and reviewing the Company’s strategic direction and objectives, taking into account, among other considerations, the Company’s risk profile and exposures. While the Board of Directors retains oversight over policy and strategy related to cybersecurity, it has delegated the responsibility for the oversight of the Company’s cybersecurity program to the Audit Committee. The Audit Committee is responsible for reviewing and discussing the Company’s policies regarding risk assessment and risk management, major accounting risk exposures and the implementation and effectiveness of risk management protocols with respect to information technology security and cybersecurity risks, as well as reviewing material breaches and attacks, as applicable.

Cybersecurity Risk Management Positions or Committees Responsible [Flag]

true

Cybersecurity Risk Management Positions or Committees Responsible [Text Block]

Our Director of Cybersecurity has over 20 years of relevant experience and is responsible for managing our cybersecurity program and team, which monitors the day-to-day risks using the approach described above. Material near-term and long-term risks are communicated with senior management and the Board of Directors.

Cybersecurity Risk Management Expertise of Management Responsible [Text Block]

Our Director of Cybersecurity has over 20 years of relevant experience and is responsible for managing our cybersecurity program and team, which monitors the day-to-day risks using the approach described above.

Cybersecurity Risk Process for Informing Management or Committees Responsible [Text Block]

Our Director of Cybersecurity has over 20 years of relevant experience and is responsible for managing our cybersecurity program and team, which monitors the day-to-day risks using the approach described above. Material near-term and long-term risks are communicated with senior management and the Board of Directors. The Company's Board of Directors is engaged in overseeing and reviewing the Company’s strategic direction and objectives, taking into account, among other considerations, the Company’s risk profile and exposures. While the Board of Directors retains oversight over policy and strategy related to cybersecurity, it has delegated the responsibility for the oversight of the Company’s cybersecurity program to the Audit Committee. The Audit Committee is responsible for reviewing and discussing the Company’s policies regarding risk assessment and risk management, major accounting risk exposures and the implementation and effectiveness of risk management protocols with respect to information technology security and cybersecurity risks, as well as reviewing material breaches and attacks, as applicable.

Cybersecurity Risk Management Positions or Committees Responsible Report to Board [Flag]

true

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SIGNIFICANT ACCOUNTING POLICIES (Policies)

12 Months Ended

Dec. 31, 2024

Accounting Policies [Abstract]

Basis of Presentation

Basis of Presentation`

The Consolidated Financial Statements and Notes to Consolidated Financial Statements are prepared under GAAP.

These accounting principles require management to use estimates and assumptions that impact reported amounts of assets, liabilities, revenues and expenses, and the disclosure of contingent assets and liabilities. Actual results may differ from our estimates. We believe the assumptions underlying these financial statements are reasonable.

In our opinion, the accompanying Consolidated Financial Statements include all adjustments, consisting of normal recurring adjustments, necessary to present a fair statement of our financial position as of December 31, 2024, results of operations for the years ended December 31, 2024, 2023 and 2022, statement of changes in stockholders' equity for the years ended December 31, 2024, 2023 and 2022, and cash flows for the years ended December 31, 2024, 2023 and 2022.

Principles of Consolidation

Principles of Consolidation

We consolidate all majority-owned subsidiaries and investments in entities in which we have a controlling influence. Non-controlled investments are accounted for using the equity method of accounting when we are able to significantly influence the operating policies of the investee. When we do not influence the operating policies of an investee, the equity investment is measured at fair value, if readily determinable, or if not readily determinable, at cost less impairment, if applicable. We eliminate all intercompany balances and transactions.

We evaluate whether an entity is a VIE whenever reconsideration events occur. We consolidate VIEs for which we are the primary beneficiary. When assessing the determination of the primary beneficiary, we consider all relevant facts and circumstances, including: the power, through voting or similar rights, to direct the activities of the VIE that most significantly impact the VIE's economic performance and the obligation to absorb the expected losses and/or the right to receive the expected returns of the VIE. We perform ongoing reassessments of all VIEs to determine if the primary beneficiary status has changed.

Equity Method Investments

Equity Method Investments

Non-controlled investments are accounted for using the equity method of accounting when we are able to significantly influence the operating policies of the investee. Under the equity method of accounting, investments are recorded at historical cost as an asset and adjusted for capital contributions, dividends and distributions received, and our share of the investee's earnings or losses, which are recorded as earnings from equity method investees on the Consolidated Statements of Operations. Equity method investments and related activity are included in the Pipeline segment.

Cash and Cash Equivalents

Cash and Cash Equivalents

Cash and cash equivalents include cash in banks and highly liquid money market investments with remaining maturities of three months or less, when purchased. Cash equivalents are stated at cost, which approximates fair value.

Financing Receivables

Financing Receivables

Financing receivables are primarily composed of trade accounts receivable and notes receivable, which are stated at net realizable value.

We regularly monitor the credit quality of our financing receivables by reviewing counterparty credit quality indicators and monitoring for triggering events, such as a credit rating downgrade or bankruptcy. We have three internal grades of credit quality, with internal grade 1 as the lowest risk and internal grade 3 as the highest risk. The related credit quality indicators and risk ratings utilized to develop the internal grades have been updated through December 31, 2024. As of December 31, 2024, the notes receivable — related party of $4 million, which originated prior to 2021, was classified as internal grade 1. There are no notes receivable on nonaccrual status and no past due financing receivables as of December 31, 2024.

Notes receivable are typically considered delinquent (past due) when payment is not received for periods ranging from 60 to 120 days. We cease accruing interest income (nonaccrual status) and may either write off or establish an allowance for expected credit loss for the note receivable when it is expected that all contractual principal or interest amounts due will not be collected. In determining an allowance for expected credit losses for or the write off of notes receivable, we consider the historical payment experience and other factors that are expected to have a specific impact on collection, including existing and future economic conditions. Cash receipts for notes receivable on nonaccrual status that do not bring the account contractually current are first applied to contractually owed past due interest, with any remainder applied to principal. Recognition of interest income is generally resumed when the note receivable becomes contractually current.

We had an investment in certain assets in the Utica Shale region which was accounted for as a note receivable — third party. A third party purchased our investment in certain assets in the Utica Shale region based on significantly improved commodity pricing during the second quarter 2022 for proceeds of $22 million. This resulted in a gain of $17 million recorded in Asset (gains) losses and impairments, net on the Consolidated Statement of Operations. We maintain no continuing involvement with the note receivable.

For trade accounts receivable, the customer allowance for expected credit loss is calculated based on specific review of future collections based on receivable balances generally in excess of 30 days. Existing and future economic conditions, historical loss rates, customer trends and other relevant factors that may affect our ability to collect are also considered. Receivables are written off on a specific identification basis and determined based on the particular circumstances of the associated receivable.

Property, Plant, and Equipment

Property, Plant, and Equipment

Property is stated at cost and includes construction-related labor, materials, overhead and capitalized interest. Property for FERC-Regulated entities includes equity AFUDC. Equity AFUDC represents the capitalization of the estimated average cost of equity during construction projects and is recorded as a credit to allowance for funds used during construction in our Consolidated Statements of Operations. Expenditures for maintenance and repairs are charged to expense when incurred. Property, plant and equipment is depreciated over its estimated useful life using the straight-line method.

Intangible Assets

Intangible Assets

Intangible assets with finite useful lives are amortized on a straight-line basis over the periods benefited.

Long-Lived Assets

Long-Lived Assets

Long-lived assets are reviewed for impairment whenever events or changes in circumstances indicate the carrying amount of an asset may not be recoverable. If the carrying amount of the asset exceeds the expected undiscounted future cash flows generated by the asset, an impairment loss is recognized resulting in the asset being written down to its estimated fair value. Assets to be disposed of are reported at the lower of the carrying amount or fair value, less costs to sell.

Purchase Accounting

Purchase Accounting

In accordance with the business combination acquisition method of accounting, the assets acquired and liabilities assumed in an acquired business are measured at their estimated fair values at the acquisition date.

Goodwill

Goodwill

DT Midstream has goodwill resulting from business combinations. For each reporting unit with goodwill, we perform an impairment test annually or whenever events or circumstances indicate that the value of goodwill may be impaired.

Operation and Maintenance

Operation and Maintenance

Operation and maintenance is primarily comprised of costs for labor and employee benefits, outside services, materials, compression, purchased natural gas, operating lease costs, office costs, and other operating and maintenance costs.

Depreciation and Amortization

Depreciation and Amortization

Depreciation and amortization is related to Property, plant and equipment and Customer relationships and other intangible assets, net, used in our transportation, storage and gathering businesses.

Recently Adopted Pronouncements and Recently Issued Pronouncements

Recently Adopted Pronouncements

In November 2023, the FASB issued ASU No. 2023-07, Segment Reporting (Topic 280) - Improvements to Reportable Segment Disclosures. The amendments improve reportable segment disclosure requirements, primarily through enhanced disclosures about significant segment expenses and interim disclosure requirements. The amendments are effective for fiscal years beginning after December 15, 2023 and interim periods within fiscal years beginning after December 15, 2024. Early adoption is permitted. We adopted this ASU on December 31, 2024, and applied the amendments retrospectively to all prior periods presented in our Consolidated Financial Statements. See Note 14, "Segment and Related Information," to the Consolidated Financial Statements.

Recently Issued Pronouncements

In December 2023, the FASB issued ASU No. 2023-09, Income Taxes (Topic 740) - Improvements to Income Tax Disclosures. The amendments improve transparency of income tax disclosure requirements, primarily through enhanced disclosures of rate reconciliation and income taxes paid. The amendments are effective for annual periods beginning after December 15, 2024. Early adoption is permitted. We continue to evaluate the impact of this standard's adoption on our Consolidated Financial Statements.

In November 2024, the FASB issued ASU No. 2024-03, Income Statement—Reporting Comprehensive Income—Expense Disaggregation Disclosures (Subtopic 220-40) - Disaggregation of Income Statement Expenses. The amendments require enhanced disclosures of specified costs and expenses included in significant expense captions in the income statement, including purchases of inventory, employee compensation, depreciation, amortization, and other key amounts. The FASB subsequently issued ASU No. 2025-01 in January 2025 to clarify the effective date of ASU No. 2024-03. The amendments are effective for fiscal years beginning after December 15, 2026 and interim reporting periods within annual reporting periods beginning after December 15, 2027. Early adoption is permitted. We are currently evaluating the impact of this standard's adoption on our Consolidated Financial Statements.

Revenue

Significant Accounting Policy – Revenue

Pipeline revenues consist of services related to the gathering, transportation and/or storage of natural gas. Gathering revenues consist of services related to the gathering, processing, and/or treating of natural gas. Revenue is measured based upon the pricing or consideration for such services specified in the contract with a customer. Consideration may consist of both fixed components including fixed demand charges and fixed deficiency fee rates for MVCs, and variable components including fixed rates for the actual volumes flowed under interruptible services and other associated fees.

Our contracts with customers generally contain a single performance obligation, which is a promise to deliver either a distinct service or a series of distinct services to the customer. When multiple performance obligations exist, the contract consideration is allocated between the performance obligations based on the relative standalone selling price, which is determined by prices charged to customers or the adjusted market assessment approach. The adjusted market assessment approach involves evaluating the market in which we sell services and estimating the price that a customer in that market would be willing to pay.

Revenue is recognized when performance obligations are satisfied by delivering a service to a customer, which occurs when the service is provided to the customer. When a customer simultaneously receives and consumes the service provided, revenue is recognized over time. Alternatively, if it is determined that the criteria for recognition of revenue over time is not met, the revenue is considered to be recognized at a point in time. Our revenues, including estimated unbilled amounts, are generally recognized over time as actual services are provided, or ratably over time when providing a stand-ready service. Unbilled amounts are generally determined using preliminary meter data volumes and contracted pricing, and typically result in minor adjustments. Generally, uncertainties in the variable consideration components are resolved and revenue amounts are known at the time of recognition. We have determined that the above methods represent a faithful depiction of delivering a service to the customer. Revenues are typically billed and consideration received monthly, however, certain deficiency fees related to MVCs are billed quarterly or annually.

Accounting for Income Taxes

Significant Accounting Policy – Accounting for Income Taxes

We record the effect of income taxes in accordance with GAAP, which provides for the use of an asset and liability approach. Deferred income tax assets and liabilities are recognized for temporary differences between the basis of assets and liabilities for financial reporting and tax purposes and measured using enacted tax rates in effect for the year in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities as a result of changes in the enacted tax rates is recognized in earnings in the period of enactment. Our recognition of deferred tax assets is based upon a more-likely-than-not criterion. We routinely assess realizability based on objectively-weighted, available positive and negative evidence.

We account for uncertainties in income taxes using a benefit recognition model with a two-step approach: a more-likely-than-not recognition criterion, and a measurement attribute that measures the position as the largest amount of tax benefit that is greater than a 50% likelihood of being realized upon ultimate settlement. If the benefit does not meet the more likely than not criteria for being sustained on its technical merits, no benefit will be recorded. Uncertain tax positions that relate only to timing of when an item is included on a tax return are considered to have met the recognition threshold.

Lessee

Significant Accounting Policy – Lessee Accounting

Lease liabilities are calculated utilizing a discount rate to determine the present values of lease payments. GAAP requires the use of the rate implicit in the lease if it is readily determinable. When the rate implicit in the lease is not readily determinable, the incremental borrowing rate is used. The incremental borrowing rate is based upon the rate of interest that would have been paid on a collateralized basis over similar contract terms to that of the leases. The incremental borrowing rates have been determined utilizing an implied secured borrowing rate based upon an unsecured rate for a similar time period of remaining lease terms, which is then adjusted for the estimated impact of collateral. We have leases with non-index-based escalation clauses for fixed dollar or percentage increases over the contract term.

We have certain leases which contain purchase options. Based upon the nature of the leased property and terms of the purchase options, we have determined it is not reasonably certain that such purchase options will be exercised. Thus, the impact of the purchase options has not been included in the determination of right-of-use assets and lease liabilities for the subject leases.

We have certain leases which contain renewal options. Where the renewal options were deemed reasonably certain to occur, the impacts of such options were included in the determination of the right-of-use assets and lease liabilities for the subject leases.

We have agreements with lease and non-lease components, which are generally accounted for separately. Consideration in a lease is allocated between lease and non-lease components based upon the estimated relative standalone prices.

Lessor

Lessor

A lease exists when we have provided other parties with the right to control the use of identified property, plant or equipment, as conveyed through a contract, for a certain time period and consideration received. The right to control is deemed to occur when we have provided other parties with the right to obtain substantially all of the economic benefits of the identified assets and the right to direct the use of such assets.

We lease certain assets under an operating lease for a pipeline which commenced in December 2018. The lease is comprised of fixed payments with a remaining term of 14 years. The operating lease does not have renewal provisions or options to purchase the assets at the end of the lease and does not have termination for convenience provisions. The lease term extends to the end of the estimated economic life of the leased assets, thereby resulting in no residual value.

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DESCRIPTION OF THE BUSINESS AND BASIS OF PRESENTATION (Tables)

12 Months Ended

Dec. 31, 2024

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Schedule of Variable Interest Entities

The following table summarizes the major line items in the Consolidated Statements of Financial Position for consolidated VIEs as of December 31, 2024 and 2023. All assets and liabilities of a consolidated VIE are included in the table when it has been determined that a consolidated VIE has either (1) assets that can be used only to settle obligations of the VIE or (2) liabilities for which creditors do not have recourse to the general credit of the primary beneficiary. The assets and liabilities of consolidated VIEs that meet the definition of a business and whose assets can be used for purposes other than the settlement of the VIEs' obligations have been excluded from the table below.

	December 31,
	2024		2023
	(millions)
ASSETS (a)
Cash	$	17	$	13
Accounts receivable	11		10
Other current assets	2		2
Intangible assets, net	468		483
Property, plant and equipment, net	391		391
Goodwill	25		25
	$	914	$	924
LIABILITIES (a)
Accounts payable and other current liabilities	$	5	$	4
Other noncurrent liabilities	3		3
	$	8	$	7

_____________________________________

(a)Amounts shown are 100% of the consolidated VIEs' assets and liabilities.

Schedule of Equity Method Investments

Earnings from equity method investees include:

	Year Ended December 31,
	2024		2023		2022
	(millions)
NEXUS	$	62	$	68	$	61
Vector	41		38		36
Millennium	59		71		53
Total earnings from equity method investees	$	162	$	177	$	150

Equity method investees are described below:

	Investments As of				% Owned As of
	December 31,				December 31,
Equity Method Investee	2024		2023		2024	2023
	(millions)
NEXUS	$	880	$	900	50%	50%
Vector	134		135		40%	40%
Millennium	283		727		52.5%	52.5%
Total investments in equity method investees	$	1,297	$	1,762

The following tables present summarized financial information of our non-consolidated equity method investees. The amounts included below represent 100% of the results of continuing operations of such entities, including the portion owned by other parties.

Summarized balance sheet data is as follows:

	December 31,
	2024		2023
	(millions)
Current assets	$	170	$	159
Noncurrent assets	3,939		4,057
Current liabilities	209		208
Noncurrent liabilities	$	1,930	$	1,177

Summarized income statement data is as follows:

	Year Ended December 31,
	2024		2023		2022
	(millions)
Operating revenues	$	818	$	823	$	800
Operating expenses	376		377		396
Net Income	$	364	$	392	$	372

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SIGNIFICANT ACCOUNTING POLICIES (Tables)

12 Months Ended

Dec. 31, 2024

Accounting Policies [Abstract]

Schedule of Significant Other Accounting Policies

Other Significant Accounting Policies

Footnote	Title
Note 1	Equity Method Investments
Note 4	Revenue
Note 7	Income Taxes
Note 9	Fair Value
Note 11	Leases
Note 14	Reportable Segments
Note 16	Acquisitions
Note 17	Regulation

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REVENUE (Tables)

12 Months Ended

Dec. 31, 2024

Revenue from Contract with Customer [Abstract]

Disaggregation of Revenue

The following is a summary of revenues disaggregated by segment:

	Year Ended December 31,
	2024		2023		2022
	(millions)
Pipeline (a)	$	443	$	377	$	339
Gathering	538		545		581
Total operating revenues	$	981	$	922	$	920

__________________________________

(a) Includes revenues outside the scope of ASC 606 primarily related to contracts accounted for as leases of $9 million, $7 million and $10 million for the years ended December 31, 2024, 2023 and 2022, respectively.

Summary of Contact Liability Activity

The following is a summary of contract liability activity:

	2024		2023
	(millions)
Balance as of January 1	$	129	$	32
Increases due to cash received or receivable, excluding amounts recognized as revenue during the period (a)	47		101
Revenue recognized that was included in the balance at the beginning of the period	(23)		(4)
Balance as of December 31	$	153	$	129

__________________________________

(a) During the year ended December 31, 2024 and 2023, we collected prepayment amounts from customers under various long-term revenue contracts on Ohio Utica Gathering, Appalachia Gathering, Blue Union Gathering and LEAP.

Revenue Expected to be Recognized in Future Periods

The following table presents contract liability amounts as of December 31, 2024 that are expected to be recognized as revenue in future periods:

	(millions)
2025	$	18
2026	18
2027	18
2028	16
2029	16
2030 and thereafter	67
Total	$	153

The following table presents revenue amounts related to fixed consideration associated with unsatisfied performance obligations as of December 31, 2024 that are expected to be recognized as revenue in future periods:

	(millions)
2025	$	265
2026	223
2027	226
2028	181
2029	149
2030 and thereafter	268
Total	$	1,312

Schedule of Customers which Represents 10% or More of Total Revenues

The following table summarizes the customer which represents 10% or more of our total revenue for the years ended December 31, 2024, 2023 and 2022. Both Pipeline and Gathering segments provided services to this customer.

	2024				2023				2022
	Customer		Percentage		Customer		Percentage		Customer		Percentage
	Revenue		of Total		Revenue		of Total		Revenue		of Total
Customer:	(millions, except percentages)
Expand Energy	$	555	56	%	$	560	60	%	$	596	65	%

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GOODWILL (Tables)

12 Months Ended

Dec. 31, 2024

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Goodwill

The following is the summary of the change in the carrying amount of goodwill:

	2024		2023
	(millions)
Balance at January 1	$	473	$	473
Goodwill attributable to the Midwest Pipeline Acquisition	303		—
Balance at December 31	$	776	$	473

The following is a summary of the carrying value of goodwill by reporting unit:

	December 31,
	2024		2023
	(millions)
Pipeline	$	356	$	53
Gathering	420		420
Total goodwill	$	776	$	473

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PROPERTY, PLANT, AND EQUIPMENT AND INTANGIBLE ASSETS (Tables)

12 Months Ended

Dec. 31, 2024

Property, Plant and Equipment [Abstract]

Schedule of Property, Plant and Equipment

The following is a summary of Property, plant, and equipment by classification:

	Average Estimated Useful Life	December 31,
		2024		2023
	(years)	(millions)
Property, plant, and equipment
Land and other non-depreciable assets	N/A	$	105	$	96
Rights of way and easements	25 to 53	168		103
Pipelines and interconnects	10 to 95	4,437		3,460
Facilities and processing plants	7 to 50	1,364		1,234
Wells and well equipment	40 to 70	70		70
General plant	3 to 40	60		40
Construction in progress	N/A	321		279
Total Property, plant, and equipment		$	6,525	$	5,282
Less accumulated depreciation		(998)		(848)
Net Property, plant, and equipment		$	5,527	$	4,434

Schedule of Intangible Assets

The following is a summary of Intangible Assets by classification:

		December 31, 2024						December 31, 2023
	Useful Lives	Gross Carrying Value		Accumulated Amortization		Net Carrying Value		Gross Carrying Value		Accumulated Amortization		Net Carrying Value
		(millions)
Intangible assets subject to amortization
Customer relationships	3 - 40 years (a)	$	2,262	$	(345)	$	1,917	$	2,252	$	(289)	$	1,963
Contract intangibles	14 - 26 years	18		(14)		4		18		(13)		5
Total		$	2,280	$	(359)	$	1,921	$	2,270	$	(302)	$	1,968

_____________________________________

(a) The useful lives of the customer relationship intangible assets are based on the number of years in which the assets are expected to economically contribute to the business. The expected economic benefit incorporates existing customer contracts and expected renewal rates based on the estimated volume and production lives of natural gas resources in each region.

Schedule of Estimated Intangibles Assets Amortization Expense

The following table summarizes estimated customer relationships and contract intangibles amortization expense to be recognized during each year through 2029:

	2025		2026		2027		2028		2029
	(millions)
Estimated amortization expense	$	60	$	60	$	60	$	59	$	59

Schedule of Depreciation and Amortization

The following is a summary of depreciation and amortization expense by asset type:

	Year Ended December 31,
	2024		2023		2022
	(millions)
Property, plant, and equipment	$	152	$	125	$	113
Customer relationships and other intangible assets, net	57		57		57
Total Depreciation and amortization	$	209	$	182	$	170

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INCOME TAXES (Tables)

12 Months Ended

Dec. 31, 2024

Income Tax Disclosure [Abstract]

Schedule of Effective Income Tax Rate Reconciliation

Our total Income Tax Expense varied from the statutory federal income tax rate for the following reasons:

	Year Ended December 31,
	2024			2023			2022
	(millions)
Income Before Income Taxes	$	504		$	500		$	482
Income tax expense at statutory rate	106			105			101
State and local income taxes, net of federal benefit	18			18			24
State tax rate changes	15			(18)			(25)
Other, net	(2)			(1)			—
Income Tax Expense	$	137		$	104		$	100
Effective income tax rate	27.3		%	20.9		%	20.7		%

Schedule of Income Tax Expense

Components of Income tax expense were as follows:

	Year Ended December 31,
	2024		2023		2022
	(millions)
Current income tax expense
Federal	$	13	$	(4)	$	16
State and other income tax	4		(2)		14
Total current income tax expense	17		(6)		30
Deferred income tax expense
Federal	84		109		86
State and other income tax	36		1		(16)
Total deferred income tax expense	120		110		70
Total Income Tax Expense	$	137	$	104	$	100

Schedule of Deferred Tax Assets (Liabilities)

Deferred tax assets (liabilities) were comprised of the following:

	December 31,
	2024		2023
	(millions)
Deferred income tax balance components
Property, plant, and equipment	$	(369)	$	(369)
Federal net operating loss carry-forward	117		184
State and local net operating loss carry-forward, net of federal	75		102
Investment in equity method investees and partnerships	(970)		(979)
Other	18		31
Net deferred income tax asset / (liability)	$	(1,129)	$	(1,031)
Total deferred income tax assets and liabilities
Deferred income tax assets	$	266	$	319
Deferred income tax liabilities	(1,395)		(1,350)
Net deferred income tax asset / (liability)	$	(1,129)	$	(1,031)

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EARNINGS PER SHARE AND DIVIDENDS (Tables)

12 Months Ended

Dec. 31, 2024

Earnings Per Share [Abstract]

Reconciliation of Basic and Diluted Earnings Per Share

The following is a reconciliation of basic and diluted earnings per share:

	Year Ended December 31,
	2024		2023		2022
	(millions, except per share amounts)
Basic and Diluted Earnings per Common Share
Net Income Attributable to DT Midstream	$	354	$	384	$	370
Average number of common shares outstanding — basic	97.6		96.9		96.7
Incremental shares attributable to:
Average dilutive restricted stock units and performance share awards	0.8		0.6		0.5
Average number of common shares outstanding — diluted	98.4		97.5		97.2
Basic Earnings per Common Share	$	3.63	$	3.97	$	3.83
Diluted Earnings per Common Share	$	3.60	$	3.94	$	3.81

Schedule of Cash Dividends Declared

We declared the following cash dividends:

Dividends Declared	Dividend Amount				Dividend Payment Date
(quarter ended)	(per-share)		(millions)
2022
March 31	$	0.64	$	62	April 2022
June 30	$	0.64	$	62	July 2022
September 30	$	0.64	$	62	October 2022
December 31	$	0.64	$	62	January 2023
2023
March 31	$	0.69	$	67	April 2023
June 30	$	0.69	$	67	July 2023
September 30	$	0.69	$	67	October 2023
December 31	$	0.69	$	67	January 2024
2024
March 31	$	0.735	$	71	April 2024
June 30	$	0.735	$	71	July 2024
September 30	$	0.735	$	71	October 2024
December 31	$	0.735	$	75	January 2025

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FAIR VALUE (Tables)

12 Months Ended

Dec. 31, 2024

Fair Value Disclosures [Abstract]

Carrying Amount of Fair Value of Financial Instruments

The following table presents the carrying amount and fair value of financial instruments:

	December 31, 2024								December 31, 2023
	Carrying		Fair Value						Carrying		Fair Value
	Amount		Level 1		Level 2		Level 3		Amount		Level 1		Level 2		Level 3
	(millions)
Cash equivalents (a)	$	—	$	—	$	—	$	—	$	36	$	—	$	36	$	—
Long-term notes receivable — related party	4		—		—		4		4		—		—		4
Short-term borrowings (a)	150		—		150		—		165		—		165		—
Long-term debt (b)	$	3,319	$	—	$	3,136	$	—	$	3,065	$	—	$	2,850	$	—

______________________________________

(a)Short-term borrowings and money market cash equivalents are stated at cost, which approximates fair value.

(b)Carrying value as of December 31, 2024 and 2023 represents principal of $3.4 billion and $3.1 billion, respectively, net of unamortized debt discounts and issuance costs.

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DEBT (Tables)

12 Months Ended

Dec. 31, 2024

Debt Disclosure [Abstract]

Schedule of Interest Income and Interest Expense

The following table summarizes our interest expense:

	Year Ended December 31,
	2024		2023		2022
	(millions)
Interest expense	$	163	$	170	$	142
Capitalized interest	(10)		(20)		(5)
Total interest expense, net	$	153	$	150	$	137

Schedule of Long-term Debt Outstanding

The following is a summary of long-term debt:

			Maturity	December 31,		December 31,
Title	Type	Interest Rate	Date	2024		2023
				(millions)
2029 Notes	Senior Notes (a)	4.125%	2029	$	1,100	$	1,100
2031 Notes	Senior Notes (a)	4.375%	2031	1,000		1,000
2032 Notes	Senior Secured Notes (b)	4.300%	2032	600		600
2034 Notes	Senior Secured Notes (a)	5.800%	2034	650		—
Term Loan Facility	Term Loan Facility	Variable	2028	—		399
Long-term debt principal				3,350		3,099
Unamortized debt discount				(1)		(2)
Unamortized debt issuance costs				(30)		(32)
Long-term debt, net				$	3,319	$	3,065

______________________________

(a) Interest payable semi-annually in arrears each June 15 and December 15. The first interest payment due on the 2034 Notes is June 15, 2025.

(b) Interest payable semi-annually in arrears each April 15 and October 15.

Schedule of Debt Maturities

The following table presents scheduled debt maturities, excluding any unamortized discount on debt:

		2025		2026	2027	2028	2029 and Thereafter	Total
	(millions)
Debt maturities		$	—	—	—	—	3,350	$	3,350

Schedule of Availability Under the Revolving Credit Facility

The following table presents the availability under the Revolving Credit Facility:

	December 31,
	2024
	(millions)
Total availability
Revolving Credit Facility, expiring December 2029	$	1,000
Amounts outstanding
Revolving Credit Facility borrowings (a)	150
Letters of credit	16
	166
Net availability	$	834

______________________________

(a) The weighted average interest rate for Revolving Credit Facility borrowings outstanding was 4.34% as of December 31, 2024.

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LEASES (Tables)

12 Months Ended

Dec. 31, 2024

Leases [Abstract]

Schedule of Components of Lease Cost and Other Relevant Information Related to Leases

The components of lease cost for the following years includes:

	Year Ended December 31,
	2024		2023		2022
	(millions)
Operating lease cost	$	21	$	20	$	20
Short-term lease cost	3		3		3
	$	24	$	23	$	23

Other relevant information related to leases for the following years includes:

	Year Ended December 31,
	2024			2023			2022
Supplemental Cash Flows Information	(millions, except years and percentages)
Cash paid for amounts included in the measurement of these liabilities:
Operating cash flows for operating leases	$	21		$	21		$	18
Right-of-use assets obtained in exchange for lease obligations:
Operating leases	$	29		$	25		$	14
Weighted Average Remaining Lease Term
Operating leases	3.9 years			4.4 years			4.0 years
Weighted Average Discount Rate
Operating leases	5.3		%	4.8		%	3.5		%

Schedule of Future Minimum Lease Payments Under Leases

Future minimum lease payments under leases for remaining periods as of December 31, 2024 are as follows:

	Operating Leases
	(millions)
2025	$	17
2026	15
2027	14
2028	6
2029	2
2030 and thereafter	3
Total future minimum lease payments	57
Imputed interest	(5)
Lease liabilities	$	52

Schedule of Future Minimum Rental Revenues

Future minimum rental revenues for remaining periods as of December 31, 2024 are as follows:

	Operating Lease
	(millions)
2025	$	77
2026	62
2027	9
2028	9
2029	9
2030 and thereafter	79
Total future minimum rental revenues	$	245

Schedule of Property Under Operating Leases

Property under the operating lease is as follows:

	December 31,
	2024		2023
	(millions)
Gross property under operating leases	$	484	$	58
Accumulated amortization of property under operating leases	$	17	$	15

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COMMITMENTS AND CONTINGENCIES (Tables)

12 Months Ended

Dec. 31, 2024

Commitments and Contingencies Disclosure [Abstract]

Schedule of Purchase Commitments

We estimate lifetime purchase commitments of approximately $95 million, due in the periods shown below.

	(millions)
2025	$	14
2026	13
2027	12
2028	12
2029	12
2030 and thereafter	32
Total	$	95

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STOCK-BASED COMPENSATION AND DEFINED CONTRIBUTION PLANS (Tables)

12 Months Ended

Dec. 31, 2024

Share-Based Payment Arrangement [Abstract]

Summary of Stock-based Compensation Expense

The following table summarizes our stock-based compensation expense and the related income tax benefit:

	Year Ended December 31,
	2024		2023		2022
	(millions)
Stock-based compensation expense	$	23	$	20	$	17
Tax benefit	$	5	$	5	$	4

Summary of Restricted Stock Unit Activity

The following table summarizes restricted stock unit activity for the year ended December 31, 2024:

	Restricted Stock Units	Weighted- Average Grant Date Fair Value
	(thousands)	(per share)
Nonvested as of December 31, 2023	417	$	45.82
Granted (a)	152	60.37
Forfeited	(4)	49.35
Vested (b)	(104)	42.40
Nonvested as of December 31, 2024	461	$	51.37

____________________________________

(a)Includes initial grants and dividends reinvested.

(b)Includes vested, not issued shares of two thousand at December 31, 2024. Shares will be issued in first quarter 2025.

Summary of Performance Shares Activity

The following table summarizes performance share award activity for the year ended December 31, 2024:

	Performance Share Awards	Weighted- Average Grant Date Fair Value
	(thousands)	(per share)
Nonvested as of December 31, 2023	557	$	64.36
Granted (a)	372	55.32
Forfeited	(29)	59.66
Settled	(199)	48.12
Nonvested as of December 31, 2024	701	$	64.38

_____________________________________

(a)Includes initial grants, dividends reinvested and shares added for achievement of final performance objectives on settled awards.

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SEGMENT AND RELATED INFORMATION (Tables)

12 Months Ended

Dec. 31, 2024

Segment Reporting [Abstract]

Schedule of Inter-segment Billing and Financial Data by Business Segment

Financial data for our business segments follows:

	Year Ended December 31, 2024
	Pipeline		Gathering		Total Reportable Segments		Eliminations		Total Consolidated
	(millions)
Revenues
Operating revenues	$	443	$	538	$	981	$	—	$	981
Operating Expenses
Operation and maintenance	68		176		244		—		244
Depreciation and amortization	74		135		209		—		209
Taxes other than income	22		17		39		—		39
Other (Income) and Deductions
Interest expense	47		106		153		—		153
Interest income	(4)		(3)		(7)		—		(7)
Earnings from equity method investees	(162)		—		(162)		—		(162)
Loss from financing activities	3		2		5		—		5
Other income	(1)		(3)		(4)		—		(4)
Income Tax Expense	107		30		137		—		137
Less: Net Income Attributable to Noncontrolling Interests	13		—		13		—		13
Net Income Attributable to DT Midstream	$	276	$	78	$	354	$	—	$	354
Capital expenditures	$	73	$	277	$	350	$	—	$	350
Acquisition accounted for as a business combination	$	1,198	$	—	$	1,198	$	—	$	1,198
	December 31, 2024
Investments in equity method investees	$	1,297	$	—	$	1,297	$	—	$	1,297
Goodwill	356		420		776		—		776
Total Assets	$	5,274	$	4,661	$	9,935	$	—	$	9,935

	Year Ended December 31, 2023
	Pipeline		Gathering		Total Reportable Segments		Eliminations		Total Consolidated
	(millions)
Revenues
Operating revenues	$	377	$	545	$	922	$	—	$	922
Operating Expenses
Operation and maintenance	55		190		245		—		245
Depreciation and amortization	69		113		182		—		182
Taxes other than income	15		13		28		—		28
Asset (gains) losses and impairments, net	(4)		—		(4)		—		(4)
Other (Income) and Deductions
Interest expense	55		95		150		—		150
Interest income	(1)		—		(1)		—		(1)
Earnings from equity method investees	(177)		—		(177)		—		(177)
Other income	—		(1)		(1)		—		(1)
Income Tax Expense	75		29		104		—		104
Less: Net Income Attributable to Noncontrolling Interests	12		—		12		—		12
Net Income Attributable to DT Midstream	$	278	$	106	$	384	$	—	$	384
Capital expenditures	$	255	$	517	$	772	$	—	$	772
	December 31, 2023
Investments in equity method investees	$	1,762	$	—	$	1,762	$	—	$	1,762
Goodwill	53		420		473		—		473
Total Assets	$	4,439	$	4,543	$	8,982	$	—	$	8,982

	Year Ended December 31, 2022
	Pipeline		Gathering		Total Reportable Segments		Eliminations		Total Consolidated
	(millions)
Revenues
Operating revenues	$	339	$	581	$	920	$	—	$	920
Operating Expenses
Operation and maintenance	54		213		267		—		267
Depreciation and amortization	63		107		170		—		170
Taxes other than income	14		14		28		—		28
Asset (gains) losses and impairments, net	(6)		(17)		(23)		—		(23)
Other (Income) and Deductions
Interest expense	57		80		137		—		137
Interest income	(1)		(2)		(3)		—		(3)
Earnings from equity method investees	(150)		—		(150)		—		(150)
Loss from financing activities	6		7		13		—		13
Other income	—		(1)		(1)		—		(1)
Income Tax Expense	62		38		100		—		100
Less: Net Income Attributable to Noncontrolling Interests	12		—		12		—		12
Net Income Attributable to DT Midstream	$	228	$	142	$	370	$	—	$	370
Capital expenditures and acquisitions	$	638	$	252	$	890	$	—	$	890
	December 31, 2022
Investments in equity method investees	$	2,200	$	—	$	2,200	$	—	$	2,200
Goodwill	53		420		473		—		473
Total Assets	$	4,625	$	4,208	$	8,833	$	—	$	8,833

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RELATED PARTY TRANSACTIONS (Tables)

12 Months Ended

Dec. 31, 2024

Related Party Transactions [Abstract]

Schedule of Transactions with Related Parties

The following is a summary of our balances with related parties:

	December 31,
	2024		2023
	(millions)
Notes receivable from Vector — long-term	$	4	$	4
Current Liabilities — Other	$	1	$	1

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ACQUISITIONS (Tables)

12 Months Ended

Dec. 31, 2024

Business Combination, Asset Acquisition, and Joint Venture Formation [Abstract]

Schedule of Components of Preliminary Purchase Price Allocation

The components of the preliminary purchase price allocation are as follows:

		December 31,
		2024
		(millions)
Assets
	Accounts receivable	$	29
	Other current assets	10
	Property, plant, and equipment, net	933
	Goodwill	303
	Customer relationship intangible assets	11
	Regulatory assets	10
	Other assets	22
		$	1,318
Liabilities
	Accounts payable	$	12
	Property taxes payable	5
	Other current liabilities	3
	Regulatory liabilities	90
	Other liabilities	10
		$	120
Total cash consideration		$	1,198

Schedule of Pro Forma Information

The following unaudited pro forma summary presents our consolidated information as if the acquisition had occurred on January 1, 2023 using our records and seller provided information. The unaudited pro forma financial information does not purport to be indicative of the combined results of operations which would have actually been obtained had the acquisition taken place on January 1, 2023, nor should it be taken as indicative of future consolidated results of operations. The pro forma earnings for the years ended December 31, 2024 and 2023 were adjusted to include net interest expense, after tax, of $11 million and $23 million, respectively, related to the 2034 Senior Notes issued to fund the acquisition offset by the elimination of interest expense on debt held by the acquired pipelines, which was paid off at the acquisition date. Income tax expense of $22 million related to the remeasurement of state deferred income taxes as a result of the acquisition were excluded from the year ended December 31, 2024 and included in the year ended December 31, 2023. Transaction costs, after tax, of $7 million, which includes Bridge Financing fees and legal and professional expenses, were excluded from the year ended December 31, 2024 and included in the year ended December 31, 2023. Other adjustments, after tax, of $1 million and $4 million were included for the years ended December 31, 2024 and 2023, respectively.

	Pro forma (Unaudited)
	Years Ended December 31,
	2024		2023
	(in millions)
Revenue	$	1,182	$	1,091
Net Income attributable to DT Midstream	$	430	$	377

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REGULATORY MATTERS (Tables)

12 Months Ended

Dec. 31, 2024

Regulated Operations [Abstract]

Schedule of Regulatory Assets

The following includes balances and descriptions of our regulatory assets and liabilities.

	December 31,
	2024
	(millions)
Regulatory Assets
Recoverable income taxes related to AFUDC equity	$	7
Load Management Services Cost Recovery Mechanism	2
Other regulatory assets	1
	$	10
Regulatory Liabilities
Refundable federal income taxes	$	79
Removal costs liability	11
	$	90

Schedule of Regulatory Liabilities

The following includes balances and descriptions of our regulatory assets and liabilities.

	December 31,
	2024
	(millions)
Regulatory Assets
Recoverable income taxes related to AFUDC equity	$	7
Load Management Services Cost Recovery Mechanism	2
Other regulatory assets	1
	$	10
Regulatory Liabilities
Refundable federal income taxes	$	79
Removal costs liability	11
	$	90

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DESCRIPTION OF THE BUSINESS AND BASIS OF PRESENTATION - Narrative (Details) $ in Millions	1 Months Ended			12 Months Ended
	Sep. 30, 2024 USD ($)	May 31, 2023 USD ($)	Oct. 31, 2022 USD ($)	Dec. 31, 2024 USD ($) segment pipeline	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Related Party Transaction [Line Items]
Number of segments | segment				2
Amount by which the carrying amounts of equity method investments exceeds share of underlying equity in the net assets				$ 336	$ 352
Distributions from equity method investees				472	427	$ 17
Payments to acquire equity method investments				$ 5	$ 7	$ 5
Millennium
Related Party Transaction [Line Items]
Amount by which the carrying amounts of equity method investments exceeds share of underlying equity in the net assets			$ 343
Distributions from equity method investees	$ 416
Payments to acquire equity method investments			$ 552
Additional ownership interest acquired			0.2625
Ownership percentage			52.50%	52.50%	52.50%
NEXUS
Related Party Transaction [Line Items]
Distributions from equity method investees		$ 371
Ownership percentage				50.00%	50.00%
Senior Notes | Millennium Senior Unsecured Notes | Millennium
Related Party Transaction [Line Items]
Amount of debt sold	$ 800
Weighted-average coupon rate	5.88%
Senior Notes | NEXUS Senior Unsecured Notes | NEXUS
Related Party Transaction [Line Items]
Amount of debt sold		$ 750
Weighted-average coupon rate		5.52%
Stonewall VIE
Related Party Transaction [Line Items]
VIE ownership percentage				85.00%
South Romeo VIE
Related Party Transaction [Line Items]
VIE ownership percentage				50.00%
Midwest Pipeline Acquisition
Related Party Transaction [Line Items]
Number of pipelines acquired | pipeline				3

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DESCRIPTION OF THE BUSINESS AND BASIS OF PRESENTATION - Consolidated VIEs (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
ASSETS
Cash	$ 68	$ 56
Accounts receivable	172	154
Intangible assets, net	1,921	1,968
Property, plant and equipment, net	5,527	4,434
Goodwill	776	473	$ 473
Total Assets	9,935	8,982	$ 8,833
LIABILITIES
Other noncurrent liabilities	1,424	1,203
Total Liabilities	5,169	4,702
Variable interest entity, primary beneficiary
ASSETS
Cash	17	13
Accounts receivable	11	10
Other current assets	2	2
Intangible assets, net	468	483
Property, plant and equipment, net	391	391
Goodwill	25	25
Total Assets	914	924
LIABILITIES
Accounts payable and other current liabilities	5	4
Other noncurrent liabilities	3	3
Total Liabilities	$ 8	$ 7

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DESCRIPTION OF THE BUSINESS AND BASIS OF PRESENTATION - Earnings from Equity Method Investees (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Schedule of Equity Method Investments [Line Items]
Earnings from equity method investees	$ 162	$ 177	$ 150
NEXUS
Schedule of Equity Method Investments [Line Items]
Earnings from equity method investees	62	68	61
Vector
Schedule of Equity Method Investments [Line Items]
Earnings from equity method investees	41	38	36
Millennium
Schedule of Equity Method Investments [Line Items]
Earnings from equity method investees	$ 59	$ 71	$ 53

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DESCRIPTION OF THE BUSINESS AND BASIS OF PRESENTATION - Equity Method Investees (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Oct. 31, 2022
Schedule of Equity Method Investments [Line Items]
Investments As of	$ 1,297	$ 1,762	$ 2,200
NEXUS
Schedule of Equity Method Investments [Line Items]
Investments As of	$ 880	$ 900
% Owned As of	50.00%	50.00%
Vector
Schedule of Equity Method Investments [Line Items]
Investments As of	$ 134	$ 135
% Owned As of	40.00%	40.00%
Millennium
Schedule of Equity Method Investments [Line Items]
Investments As of	$ 283	$ 727
% Owned As of	52.50%	52.50%		52.50%

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DESCRIPTION OF THE BUSINESS AND BASIS OF PRESENTATION - Summarized Balance Sheet Data (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Schedule of Equity Method Investments [Line Items]
Current assets	$ 310	$ 272
Current liabilities	426	434
Equity method investment, non-consolidated investees
Schedule of Equity Method Investments [Line Items]
Current assets	170	159
Non-current assets	3,939	4,057
Current liabilities	209	208
Non-current liabilities	$ 1,930	$ 1,177

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DESCRIPTION OF THE BUSINESS AND BASIS OF PRESENTATION - Summarized Income Statement Data (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Schedule of Equity Method Investments [Line Items]
Operating revenues	$ 981	$ 922	$ 920
Net Income	367	396	382
Equity method investment, non-consolidated investees
Schedule of Equity Method Investments [Line Items]
Operating revenues	818	823	800
Operating expenses	376	377	396
Net Income	$ 364	$ 392	$ 372

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SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details)	3 Months Ended	12 Months Ended
	Jun. 30, 2022 USD ($)	Dec. 31, 2024 USD ($) internal_grade	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Financing Receivable, Past Due [Line Items]
Number of internal grades of credit quality | internal_grade		3
Proceeds from sale of notes receivable		$ 0	$ 0	$ 22,000,000
Asset (gains) losses and impairments, net		$ 0	4,000,000	23,000,000
Specific review of probable future collections based on receivable balances, threshold duration		30 days
Uncollectible expense (recovery)		$ 0	0	$ 0
Allowance for expected credit loss related to accounts receivable		0	$ 0
Past due
Financing Receivable, Past Due [Line Items]
Financing receivables		0
Notes receivable
Financing Receivable, Past Due [Line Items]
Financing receivables on nonaccrual status		$ 0
Proceeds from sale of notes receivable	$ 22,000,000
Asset (gains) losses and impairments, net	$ 17,000,000
Notes receivable | Minimum
Financing Receivable, Past Due [Line Items]
Period past due		60 days
Notes receivable | Maximum
Financing Receivable, Past Due [Line Items]
Period past due		120 days
Notes receivable | Internal grade 1 | Related Party
Financing Receivable, Past Due [Line Items]
Notes receivable, originated prior to 2021		$ 4,000,000

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REVENUE - Disaggregation of Revenue (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Disaggregation of Revenue [Line Items]
Total operating revenues	$ 981	$ 922	$ 920
Revenue outside scope of ASC 606	9	7	10
Pipeline
Disaggregation of Revenue [Line Items]
Total operating revenues	443	377	339
Revenue outside scope of ASC 606	9	7	10
Gathering
Disaggregation of Revenue [Line Items]
Total operating revenues	$ 538	$ 545	$ 581

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REVENUE - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Revenue from Contract with Customer [Abstract]
Recovery of production-related operating expenses	$ 51	$ 53	$ 65
Capitalized costs to obtain or fulfill contracts	18	18
Amortization expense related to capitalized costs	$ 1	$ 1	$ 1

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REVENUE - Contract Liabilities (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Change In Contract With Customer, Liability [Roll Forward]
Beginning balance	$ 129	$ 32
Increases due to cash received or receivable, excluding amounts recognized as revenue during the period	47	101
Revenue recognized that was included in the balance at the beginning of the period	(23)	(4)
Ending balance	$ 153	$ 129

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REVENUE - Expected Recognition of Contract Liabilities and Performance Obligations (Details) $ in Millions	Dec. 31, 2024 USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 153
Fixed-price Contract
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	1,312
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 18
Remaining performance obligation, expected timing of satisfaction	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01 | Fixed-price Contract
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 265
Remaining performance obligation, expected timing of satisfaction	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 18
Remaining performance obligation, expected timing of satisfaction	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01 | Fixed-price Contract
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 223
Remaining performance obligation, expected timing of satisfaction	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 18
Remaining performance obligation, expected timing of satisfaction	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-01-01 | Fixed-price Contract
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 226
Remaining performance obligation, expected timing of satisfaction	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2028-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 16
Remaining performance obligation, expected timing of satisfaction	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2028-01-01 | Fixed-price Contract
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 181
Remaining performance obligation, expected timing of satisfaction	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2029-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 16
Remaining performance obligation, expected timing of satisfaction	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2029-01-01 | Fixed-price Contract
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 149
Remaining performance obligation, expected timing of satisfaction	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2030-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 67
Remaining performance obligation, expected timing of satisfaction
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2030-01-01 | Fixed-price Contract
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 268
Remaining performance obligation, expected timing of satisfaction

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REVENUE - Revenue by Major Customers (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Revenue, Major Customer [Line Items]
Operating revenues	$ 981	$ 922	$ 920
Revenue | Customer | Expand Energy
Revenue, Major Customer [Line Items]
Operating revenues	$ 555	$ 560	$ 596
Percentage of total	56.00%	60.00%	65.00%

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GOODWILL (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 473	$ 473
Goodwill attributable to the Midwest Pipeline Acquisition	303	0
Goodwill, ending balance	776	473
Pipeline
Goodwill [Roll Forward]
Goodwill, beginning balance	53
Goodwill, ending balance	356	53
Gathering
Goodwill [Roll Forward]
Goodwill, beginning balance	420
Goodwill, ending balance	$ 420	$ 420

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PROPERTY, PLANT, AND EQUIPMENT AND INTANGIBLE ASSETS - Summary of Property, Plant and Equipment by Classification (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Property, Plant and Equipment [Line Items]
Property, plant, and equipment	$ 6,525	$ 5,282
Accumulated depreciation	(998)	(848)
Net Property, plant, and equipment	5,527	4,434
Land and other non-depreciable assets
Property, Plant and Equipment [Line Items]
Property, plant, and equipment	105	96
Rights of way and easements
Property, Plant and Equipment [Line Items]
Property, plant, and equipment	$ 168	103
Rights of way and easements | Minimum
Property, Plant and Equipment [Line Items]
Average Estimated Useful Life	25 years
Rights of way and easements | Maximum
Property, Plant and Equipment [Line Items]
Average Estimated Useful Life	53 years
Pipelines and interconnects
Property, Plant and Equipment [Line Items]
Property, plant, and equipment	$ 4,437	3,460
Pipelines and interconnects | Minimum
Property, Plant and Equipment [Line Items]
Average Estimated Useful Life	10 years
Pipelines and interconnects | Maximum
Property, Plant and Equipment [Line Items]
Average Estimated Useful Life	95 years
Facilities and processing plants
Property, Plant and Equipment [Line Items]
Property, plant, and equipment	$ 1,364	1,234
Facilities and processing plants | Minimum
Property, Plant and Equipment [Line Items]
Average Estimated Useful Life	7 years
Facilities and processing plants | Maximum
Property, Plant and Equipment [Line Items]
Average Estimated Useful Life	50 years
Wells and well equipment
Property, Plant and Equipment [Line Items]
Property, plant, and equipment	$ 70	70
Wells and well equipment | Minimum
Property, Plant and Equipment [Line Items]
Average Estimated Useful Life	40 years
Wells and well equipment | Maximum
Property, Plant and Equipment [Line Items]
Average Estimated Useful Life	70 years
General plant
Property, Plant and Equipment [Line Items]
Property, plant, and equipment	$ 60	40
General plant | Minimum
Property, Plant and Equipment [Line Items]
Average Estimated Useful Life	3 years
General plant | Maximum
Property, Plant and Equipment [Line Items]
Average Estimated Useful Life	40 years
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant, and equipment	$ 321	$ 279

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PROPERTY, PLANT, AND EQUIPMENT AND INTANGIBLE ASSETS - Summary of Intangible Assets (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	$ 2,280	$ 2,270
Accumulated Amortization	(359)	(302)
Net Carrying Value	1,921	1,968
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	2,262	2,252
Accumulated Amortization	(345)	(289)
Net Carrying Value	$ 1,917	1,963
Customer relationships | Minimum
Finite-Lived Intangible Assets [Line Items]
Useful Lives	3 years
Customer relationships | Maximum
Finite-Lived Intangible Assets [Line Items]
Useful Lives	40 years
Contract intangibles
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	$ 18	18
Accumulated Amortization	(14)	(13)
Net Carrying Value	$ 4	$ 5
Contract intangibles | Minimum
Finite-Lived Intangible Assets [Line Items]
Useful Lives	14 years
Contract intangibles | Maximum
Finite-Lived Intangible Assets [Line Items]
Useful Lives	26 years

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PROPERTY, PLANT, AND EQUIPMENT AND INTANGIBLE ASSETS - Estimated Intangibles Amortization Expense (Details) $ in Millions	Dec. 31, 2024 USD ($)
Property, Plant and Equipment [Abstract]
2025	$ 60
2026	60
2027	60
2028	59
2029	$ 59

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PROPERTY, PLANT, AND EQUIPMENT AND INTANGIBLE ASSETS - Depreciation and Amortization Expense by Asset Type (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Property, Plant and Equipment [Abstract]
Property, plant, and equipment	$ 152	$ 125	$ 113
Customer relationships and other intangible assets, net	57	57	57
Depreciation and amortization	$ 209	$ 182	$ 170

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INCOME TAXES - Narrative (Details) - USD ($)		12 Months Ended
	Dec. 04, 2024	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Income Tax Examination [Line Items]
Deferred income taxes		$ 1,129,000,000	$ 1,031,000,000
Deferred income tax benefit		(120,000,000)	(110,000,000)	$ (70,000,000)
State tax rate changes		15,000,000	(18,000,000)	$ (25,000,000)
Deferred tax asset related to federal net operating loss carry-forwards		117,000,000	184,000,000
State and local deferred tax assets related to net operating loss carry-forwards		75,000,000	102,000,000
Unrecognized tax benefits		0	$ 0
State and Local Jurisdiction
Income Tax Examination [Line Items]
Net operating loss carryforward, not subject to expiration		70,000,000
Net operating loss carryforward, subject to expiration		5,000,000
Louisiana Department of Revenue
Income Tax Examination [Line Items]
Deferred income tax benefit	$ 4,000,000
Midwest Pipeline Acquisition
Income Tax Examination [Line Items]
Deferred income taxes		$ 22,000,000

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INCOME TAXES - Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Income Tax Disclosure [Abstract]
Income Before Income Taxes	$ 504	$ 500	$ 482
Income tax expense at statutory rate	106	105	101
State and local income taxes, net of federal benefit	18	18	24
State tax rate changes	15	(18)	(25)
Other, net	(2)	(1)	0
Income Tax Expense	$ 137	$ 104	$ 100
Effective income tax rate	27.30%	20.90%	20.70%

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INCOME TAXES - Components of Income Tax Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Current income tax expense
Federal	$ 13	$ (4)	$ 16
State and other income tax	4	(2)	14
Total current income tax expense	17	(6)	30
Deferred income tax expense
Federal	84	109	86
State and other income tax	36	1	(16)
Total deferred income tax expense	120	110	70
Income Tax Expense	$ 137	$ 104	$ 100

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INCOME TAXES - Components of Deferred Tax Assets (Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Deferred income tax balance components
Property, plant, and equipment	$ (369)	$ (369)
Federal net operating loss carry-forward	117	184
State and local net operating loss carry-forward, net of federal	75	102
Investment in equity method investees and partnerships	(970)	(979)
Other	18	31
Net deferred income tax asset / (liability)	(1,129)	(1,031)
Total deferred income tax assets and liabilities
Deferred income tax assets	266	319
Deferred income tax liabilities	(1,395)	(1,350)
Net deferred income tax asset / (liability)	$ (1,129)	$ (1,031)

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EARNINGS PER SHARE AND DIVIDENDS - Narrative (Details) - Public Stock Offering $ / shares in Units, $ in Millions	1 Months Ended
	Nov. 30, 2024 USD ($) $ / shares shares
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Number of shares issued (in shares) | shares	4,168,750
Price per share of shares issued (in dollars per share) | $ / shares	$ 101.00
Net proceeds from shares issued | $	$ 406

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EARNINGS PER SHARE AND DIVIDENDS - Reconciliation of Basic and Diluted Earnings Per Share Calculation (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Basic and Diluted Earnings per Common Share
Net Income Attributable to DT Midstream	$ 354	$ 384	$ 370
Average number of common shares outstanding — basic (in shares)	97.6	96.9	96.7
Incremental shares attributable to:
Average dilutive restricted stock units and performance share awards (in shares)	0.8	0.6	0.5
Average number of common shares outstanding — diluted (in shares)	98.4	97.5	97.2
Basic earnings per Common Share (in dollars per share)	$ 3.63	$ 3.97	$ 3.83
Diluted earnings per Common Share (in dollars per share)	$ 3.60	$ 3.94	$ 3.81

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EARNINGS PER SHARE AND DIVIDENDS - Dividends Declared (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended												12 Months Ended
	Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Earnings Per Share [Abstract]
Dividend Amount (in dollars per share)	$ 0.735	$ 0.735	$ 0.735	$ 0.735	$ 0.69	$ 0.69	$ 0.69	$ 0.69	$ 0.64	$ 0.64	$ 0.64	$ 0.64	$ 2.94	$ 2.76	$ 2.56
Dividend Amount	$ 75	$ 71	$ 71	$ 71	$ 67	$ 67	$ 67	$ 67	$ 62	$ 62	$ 62	$ 62

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FAIR VALUE (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt principal	$ 3,350	$ 3,099
Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents	0	36
Short-term borrowings	150	165
Long-term debt	3,319	3,065
Carrying Amount | Related Party
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term notes receivable — related party	4	4
Fair Value | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents	0	0
Short-term borrowings	0	0
Long-term debt	0	0
Fair Value | Level 1 | Related Party
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term notes receivable — related party	0	0
Fair Value | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents	0	36
Short-term borrowings	150	165
Long-term debt	3,136	2,850
Fair Value | Level 2 | Related Party
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term notes receivable — related party	0	0
Fair Value | Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents	0	0
Short-term borrowings	0	0
Long-term debt	0	0
Fair Value | Level 3 | Related Party
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term notes receivable — related party	$ 4	$ 4

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DEBT - Narrative (Details)		1 Months Ended			12 Months Ended
	Nov. 30, 2024 USD ($)	Sep. 30, 2024 USD ($)	Oct. 31, 2022 USD ($)	Apr. 30, 2022 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Line of Credit Facility [Line Items]
Debt issuance costs					$ 30,000,000	$ 32,000,000
Repayment of long-term debt					399,000,000	0	$ 596,000,000
Loss on extinguishment of debt					5,000,000	0	13,000,000
Issuance of long-term debt, net of discount and issuance costs					$ 644,000,000	0	$ 591,000,000
Maximum consolidated net leverage ratio					3.25
Term Loan Facility
Line of Credit Facility [Line Items]
Repayment of long-term debt		$ 399,000,000		$ 593,000,000
Loss on extinguishment of debt		4,000,000		9,000,000
Prepayment cost		$ 0		0
Write-off of unamortized discount and issuance costs				4,000,000
Revolving Credit Facility | Revolving Credit Facility, expiring December 2029
Line of Credit Facility [Line Items]
Maximum borrowing capacity			$ 1,000,000,000.0		$ 1,000,000,000
Increase in commitments			$ 250,000,000
Amendment costs capitalized					3,000,000
Debt related to issuance and amendment costs, net of amortization					$ 7,000,000	$ 6,000,000
Maximum consolidated net leverage ratio					5
Temporary step up maximum consolidated net leverage ratio					5.5
Consideration value related to consummation or acquisition or investment required to temporarily step up maximum consolidated net leverage ratio					$ 50,000,000
Minimum interest coverage ratio					2.5
Consolidated net leverage ratio					2.3
Interest coverage ratio					9.3
Line of Credit | Bridge Loan | 364-Day Bridge Loan Facility
Line of Credit Facility [Line Items]
Maximum borrowing capacity	$ 700,000,000
Debt instrument, term	364 days
Debt issuance costs					$ 4,000,000
Senior Notes
Line of Credit Facility [Line Items]
Dividend capacity remaining					$ 537,000,000
Senior Notes | 2034 Notes
Line of Credit Facility [Line Items]
Debt issuance costs	$ 5,000,000
Long-term debt issued	$ 650,000,000
Interest Rate	5.80%				5.80%
Debt discount costs	$ 1,000,000
Senior Notes | 2032 Notes
Line of Credit Facility [Line Items]
Long-term debt issued				$ 600,000,000
Interest Rate				4.30%	4.30%
Issuance of long-term debt, net of discount and issuance costs				$ 593,000,000

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DEBT - Interest Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Debt Disclosure [Abstract]
Interest expense	$ 163	$ 170	$ 142
Capitalized interest	(10)	(20)	(5)
Total interest expense, net	$ 153	$ 150	$ 137

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DEBT - Long-term Debt Outstanding (Details) - USD ($) $ in Millions	Dec. 31, 2024	Nov. 30, 2024	Dec. 31, 2023	Apr. 30, 2022
Debt Instrument [Line Items]
Long-term debt principal	$ 3,350		$ 3,099
Unamortized debt discount	(1)		(2)
Unamortized debt issuance costs	(30)		(32)
Long-term debt, net	3,319		3,065
Term Loan Facility
Debt Instrument [Line Items]
Long-term debt principal	$ 0		399
Senior Notes | 2029 Notes
Debt Instrument [Line Items]
Interest Rate	4.125%
Long-term debt principal	$ 1,100		1,100
Senior Notes | 2031 Notes
Debt Instrument [Line Items]
Interest Rate	4.375%
Long-term debt principal	$ 1,000		1,000
Senior Notes | 2032 Notes
Debt Instrument [Line Items]
Interest Rate	4.30%			4.30%
Long-term debt principal	$ 600		600
Senior Notes | 2034 Notes
Debt Instrument [Line Items]
Interest Rate	5.80%	5.80%
Long-term debt principal	$ 650		$ 0
Unamortized debt issuance costs		$ (5)

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DEBT - Debt Maturities (Details) $ in Millions	Dec. 31, 2024 USD ($)
Debt Disclosure [Abstract]
2025	$ 0
2026	0
2027	0
2028	0
2029 and Thereafter	3,350
Total	$ 3,350

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DEBT - Availability Under the Revolving Credit Facility (Details) - Revolving Credit Facility, expiring December 2029 - USD ($) $ in Millions	Dec. 31, 2024	Oct. 31, 2022
Line of Credit Facility [Line Items]
Amounts outstanding	$ 166
Net availability	834
Revolving Credit Facility
Line of Credit Facility [Line Items]
Total availability	1,000	$ 1,000
Amounts outstanding	$ 150
Weighted average interest rate	4.34%
Letters of credit
Line of Credit Facility [Line Items]
Amounts outstanding	$ 16

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LEASES - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Lessee, Lease, Description [Line Items]
Lessor, operating lease term	14 years
Fixed lease income	$ 9	$ 7	$ 10
Depreciation expense associated with property under operating lease	$ 3	$ 3	$ 3
Minimum
Lessee, Lease, Description [Line Items]
Lessee, operating lease term	1 year
Maximum
Lessee, Lease, Description [Line Items]
Lessee, operating lease term	11 years

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LEASES - Components of Lease Cost (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Leases [Abstract]
Operating lease cost	$ 21	$ 20	$ 20
Short-term lease cost	3	3	3
Lease cost	$ 24	$ 23	$ 23

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LEASES - Other Relevant Information Related to Leases (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Cash paid for amounts included in the measurement of these liabilities:
Operating cash flows for operating leases	$ 21	$ 21	$ 18
Right-of-use assets obtained in exchange for lease obligations:
Operating leases	$ 29	$ 25	$ 14
Weighted Average Remaining Lease Term
Operating leases	3 years 10 months 24 days	4 years 4 months 24 days	4 years
Weighted Average Discount Rate
Operating leases	5.30%	4.80%	3.50%

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LEASES - Future Minimum Lease Payments Under Leases (Details) $ in Millions	Dec. 31, 2024 USD ($)
Leases [Abstract]
2026	$ 17
2027	15
2028	14
2029	6
2030	2
2030 and thereafter	3
Total future minimum lease payments	57
Imputed interest	(5)
Lease liabilities	$ 52

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LEASES - Future Minimum Rental Revenues (Details) $ in Millions	Dec. 31, 2024 USD ($)
Leases [Abstract]
2026	$ 77
2027	62
2028	9
2029	9
2030	9
2030 and thereafter	79
Total future minimum rental revenues	$ 245

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LEASES - Property Under Operating Leases (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Leases [Abstract]
Gross property under operating leases	$ 484	$ 58
Accumulated amortization of property under operating leases	$ 17	$ 15

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COMMITMENTS AND CONTINGENCIES - Purchase Commitments (Details) $ in Millions	Dec. 31, 2024 USD ($)
Commitments and Contingencies Disclosure [Abstract]
2025	$ 14
2026	13
2027	12
2028	12
2029	12
2030 and thereafter	32
Total	$ 95

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COMMITMENTS AND CONTINGENCIES - Narrative (Details) $ in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2024 CAD ($)
Loss Contingencies [Line Items]
Reduction to contingent liability accrual and decrease to operation and maintenance expense	$ 9	$ 6
Accrued contingent liabilities	3	$ 13
Revolving Term Credit Facility | Vector
Loss Contingencies [Line Items]
Financing receivables			$ 70
Maximum potential payout	49
Performance surety bonds
Loss Contingencies [Line Items]
Maximum potential indemnification	$ 30

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STOCK-BASED COMPENSATION AND DEFINED CONTRIBUTION PLANS - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Authorized limit of common stock (in shares)	8,250,000
Maximum annual increase for authorized common stock (in shares)	1,750,000
Unrecognized compensation cost related to non-vested stock incentive plan arrangements	$ 27
Unrecognized compensation cost related to non-vested stock incentive plan arrangements, period for recognition	1 year 9 months 7 days
Defined contribution plan cost	$ 7	$ 7	$ 5
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average grant date, fair value, excluding reinvested dividends (in usd per share)	$ 62.63	$ 52.66	$ 52.25
Intrinsic value vested stock	$ 7	$ 8	$ 3
Restricted Stock Units | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	3 years
Restricted Stock Units | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	4 years
Performance Share Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	3 years
Weighted average grant date, fair value, excluding reinvested dividends (in usd per share)	$ 52.05	$ 53.74	$ 72.91
Intrinsic value settled stock	$ 10	$ 9	$ 4

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STOCK-BASED COMPENSATION AND DEFINED CONTRIBUTION PLANS - Stock-based Compensation Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Share-Based Payment Arrangement [Abstract]
Stock-based compensation expense	$ 23	$ 20	$ 17
Tax benefit	$ 5	$ 5	$ 4

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STOCK-BASED COMPENSATION AND DEFINED CONTRIBUTION PLANS - Restricted Stock Unit and Performance Share Activity (Details)	12 Months Ended
	Dec. 31, 2024 $ / shares shares
Weighted- Average Grant Date Fair Value
Settled (in dollars per share) | $ / shares	$ 48.12
Restricted Stock Units
Restricted Stock Units/Performance Shares
Beginning balance (in shares)	417,000
Grants (in shares)	152,000
Forfeitures (in shares)	(4,000)
Vested (in shares)	(104,000)
Ending balance (in shares)	461,000
Vested, not issued (in shares)	2,000
Weighted- Average Grant Date Fair Value
Beginning balance (in dollars per share) | $ / shares	$ 45.82
Grants (in dollars per share) | $ / shares	60.37
Forfeitures (in dollars per share) | $ / shares	49.35
Vested and issued (in dollars per share) | $ / shares	42.40
Ending balance (in dollars per share) | $ / shares	$ 51.37
Performance Share Awards
Restricted Stock Units/Performance Shares
Beginning balance (in shares)	557,000
Grants (in shares)	372,000
Forfeitures (in shares)	(29,000)
Settled (in shares)	(199,000)
Ending balance (in shares)	701,000
Weighted- Average Grant Date Fair Value
Beginning balance (in dollars per share) | $ / shares	$ 64.36
Grants (in dollars per share) | $ / shares	55.32
Forfeitures (in dollars per share) | $ / shares	59.66
Ending balance (in dollars per share) | $ / shares	$ 64.38

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SEGMENT AND RELATED INFORMATION (Details) $ in Millions	12 Months Ended
	Dec. 31, 2024 USD ($) segment	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Segment Reporting Information [Line Items]
Number of segments | segment	2
Revenues
Operating revenues	$ 981	$ 922	$ 920
Operating Expenses
Operation and maintenance	244	245	267
Depreciation and amortization	209	182	170
Taxes other than income	39	28	28
Other (Income) and Deductions
Asset (gains) losses and impairments, net	0	(4)	(23)
Interest expense	153	150	137
Interest income	(7)	(1)	(3)
Earnings from equity method investees	(162)	(177)	(150)
Loss from financing activities	5	0	13
Other income	(4)	(1)	(1)
Income Tax Expense	137	104	100
Less: Net Income Attributable to Noncontrolling Interests	13	12	12
Net Income Attributable to DT Midstream	354	384	370
Capital expenditures	350	772	890
Acquisition accounted for as a business combination	1,198	0	0
Investments in equity method investees	1,297	1,762	2,200
Goodwill	776	473	473
Total Assets	9,935	8,982	8,833
Pipeline
Revenues
Operating revenues	443	377	339
Other (Income) and Deductions
Goodwill	356	53
Gathering
Revenues
Operating revenues	538	545	581
Other (Income) and Deductions
Goodwill	420	420
Operating segments
Revenues
Operating revenues	981	922	920
Operating Expenses
Operation and maintenance	244	245	267
Depreciation and amortization	209	182	170
Taxes other than income	39	28	28
Other (Income) and Deductions
Asset (gains) losses and impairments, net		(4)	(23)
Interest expense	153	150	137
Interest income	(7)	(1)	(3)
Earnings from equity method investees	(162)	(177)	(150)
Loss from financing activities	5		13
Other income	(4)	(1)	(1)
Income Tax Expense	137	104	100
Less: Net Income Attributable to Noncontrolling Interests	13	12	12
Net Income Attributable to DT Midstream	354	384	370
Capital expenditures	350	772	890
Acquisition accounted for as a business combination	1,198
Investments in equity method investees	1,297	1,762	2,200
Goodwill	776	473	473
Total Assets	9,935	8,982	8,833
Operating segments | Pipeline
Revenues
Operating revenues	443	377	339
Operating Expenses
Operation and maintenance	68	55	54
Depreciation and amortization	74	69	63
Taxes other than income	22	15	14
Other (Income) and Deductions
Asset (gains) losses and impairments, net		(4)	(6)
Interest expense	47	55	57
Interest income	(4)	(1)	(1)
Earnings from equity method investees	(162)	(177)	(150)
Loss from financing activities	3		6
Other income	(1)	0	0
Income Tax Expense	107	75	62
Less: Net Income Attributable to Noncontrolling Interests	13	12	12
Net Income Attributable to DT Midstream	276	278	228
Capital expenditures	73	255	638
Acquisition accounted for as a business combination	1,198
Investments in equity method investees	1,297	1,762	2,200
Goodwill	356	53	53
Total Assets	5,274	4,439	4,625
Operating segments | Gathering
Revenues
Operating revenues	538	545	581
Operating Expenses
Operation and maintenance	176	190	213
Depreciation and amortization	135	113	107
Taxes other than income	17	13	14
Other (Income) and Deductions
Asset (gains) losses and impairments, net		0	(17)
Interest expense	106	95	80
Interest income	(3)	0	(2)
Earnings from equity method investees	0	0	0
Loss from financing activities	2		7
Other income	(3)	(1)	(1)
Income Tax Expense	30	29	38
Less: Net Income Attributable to Noncontrolling Interests	0	0	0
Net Income Attributable to DT Midstream	78	106	142
Capital expenditures	277	517	252
Acquisition accounted for as a business combination	0
Investments in equity method investees	0	0	0
Goodwill	420	420	420
Total Assets	4,661	4,543	4,208
Eliminations
Revenues
Operating revenues	0	0	0
Operating Expenses
Operation and maintenance	0	0	0
Depreciation and amortization	0	0	0
Taxes other than income	0	0	0
Other (Income) and Deductions
Asset (gains) losses and impairments, net		0	0
Interest expense	0	0	0
Interest income	0	0	0
Earnings from equity method investees	0	0	0
Loss from financing activities	0		0
Other income	0	0	0
Income Tax Expense	0	0	0
Less: Net Income Attributable to Noncontrolling Interests	0	0	0
Net Income Attributable to DT Midstream	0	0	0
Capital expenditures	0	0	0
Acquisition accounted for as a business combination	0
Investments in equity method investees	0	0	0
Goodwill	0	0	0
Total Assets	$ 0	$ 0	$ 0

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RELATED PARTY TRANSACTIONS - Summary of Related Party Balances (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Related Party Transaction [Line Items]
Current Liabilities — Other	$ 17	$ 15
Related Party
Related Party Transaction [Line Items]
Notes receivable from Vector — long-term	4	4
Current Liabilities — Other	$ 1	$ 1

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RELATED PARTY TRANSACTIONS - Summary of Related Party Transactions (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Related Party
Related Party Transaction [Line Items]
Operation and maintenance and Other expense	$ (2)	$ (1)	$ (1)

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ACQUISITIONS - Narrative (Details) $ in Millions			12 Months Ended
	Dec. 31, 2024 USD ($) pipeline state mi Bcf	Jul. 01, 2024 USD ($)	Dec. 31, 2024 USD ($) pipeline state mi Bcf	Dec. 31, 2023 USD ($)
Midwest Pipeline Acquisition
Asset Acquisition [Line Items]
Number of pipelines acquired | pipeline	3		3
Total consideration	$ 1,200
Operating ownership acquired	100.00%		100.00%
Pipeline capacity (in Bcf/d) | Bcf	3.7		3.7
Pipeline length (in miles) | mi	1,300		1,300
Number of states acquired pipelines cross | state	7		7
Cash consideration	$ 1,200
Intangible assets acquired	11		$ 11
Direct transaction costs for the acquisition			5
Pro forma net interest expense			11	$ 23
Pro forma income tax expense				22
Pro forma transaction costs				7
Pro forma other adjustments			1	$ 4
Midwest Pipeline Acquisition | Customer relationships
Asset Acquisition [Line Items]
Intangible assets acquired	$ 11		$ 11
Amortization period of intangible assets acquired	5 years		5 years
Guardian Pipeline, L.L.C.
Asset Acquisition [Line Items]
Pipeline length (in miles) | mi	263		263
Midwestern Gas Transmission Company
Asset Acquisition [Line Items]
Pipeline length (in miles) | mi	402		402
Viking Gas Transmission Company
Asset Acquisition [Line Items]
Pipeline length (in miles) | mi	674		674
Maximum | Customer relationships
Asset Acquisition [Line Items]
Amortization period of intangible assets acquired	40 years		40 years
Clean Fuels Gathering Asset Acquisition
Asset Acquisition [Line Items]
Purchase consideration of asset acquisition		$ 12
Contingent payment recorded as Accounts Payable	$ 10		$ 10
Clean Fuels Gathering Asset Acquisition | Maximum
Asset Acquisition [Line Items]
Contingent payments upon the completion of certain milestones		$ 34

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ACQUISITIONS - Components of Preliminary Purchase Price Allocation (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Assets
Goodwill	$ 776	$ 473	$ 473
Midwest Pipeline Acquisition
Assets
Accounts receivable	29
Other current assets	10
Property, plant, and equipment, net	933
Goodwill	303
Customer relationship intangible assets	11
Regulatory assets	10
Other assets	22
Assets	1,318
Liabilities
Accounts payable	12
Property taxes payable	5
Other current liabilities	3
Regulatory liabilities	90
Other liabilities	10
Liabilities	120
Total cash consideration	$ 1,198

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ACQUISITIONS - Pro Forma Information (Details) - Midwest Pipeline Acquisition - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Business Acquisition [Line Items]
Revenue	$ 1,182	$ 1,091
Net Income attributable to DT Midstream	$ 430	$ 377

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REGULATORY MATTERS (Details) $ in Millions	Dec. 31, 2024 USD ($)
Regulatory Asset [Line Items]
Regulatory Assets	$ 10
Regulatory Liabilities	90
Refundable federal income taxes
Regulatory Asset [Line Items]
Regulatory Liabilities	79
Removal costs liability
Regulatory Asset [Line Items]
Regulatory Liabilities	11
Recoverable income taxes related to AFUDC equity
Regulatory Asset [Line Items]
Regulatory Assets	7
Load Management Services Cost Recovery Mechanism
Regulatory Asset [Line Items]
Regulatory Assets	2
Other regulatory assets
Regulatory Asset [Line Items]
Regulatory Assets	$ 1

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SUBSEQUENT EVENT (Details) - $ / shares		3 Months Ended												12 Months Ended
	Feb. 26, 2025	Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Subsequent Event [Line Items]
Dividends declared on common stock (in dollars per share)		$ 0.735	$ 0.735	$ 0.735	$ 0.735	$ 0.69	$ 0.69	$ 0.69	$ 0.69	$ 0.64	$ 0.64	$ 0.64	$ 0.64	$ 2.94	$ 2.76	$ 2.56
Subsequent Event
Subsequent Event [Line Items]
Dividends declared on common stock (in dollars per share)	$ 0.82