10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

____________________________________

FORM 10-Q

___________________________________

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

For the quarterly period ended March 31, 2021

OR

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

For the transition period              to             

Commission File Number 001-16441

____________________________________

CROWN CASTLE INTERNATIONAL CORP.

(Exact name of registrant as specified in its charter)

Delaware	76-0470458
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)

1220 Augusta Drive, Suite 600, Houston, Texas 77057-2261

(Address of principal executives office) (Zip Code)

(713) 570-3000

(Registrant's telephone number, including area code)

____________________________________

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

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

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

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

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

Number of shares of common stock outstanding at April 29, 2021: 432,189,646

CROWN CASTLE INTERNATIONAL CORP. AND SUBSIDIARIES

INDEX

		Page
PART I—FINANCIAL INFORMATION		3
ITEM 1.	FINANCIAL STATEMENTS	3
	CONDENSED CONSOLIDATED BALANCE SHEET (Unaudited)	3
	CONDENSED CONSOLIDATED STATEMENT OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) (Unaudited)	4
	CONDENSED CONSOLIDATED STATEMENT OF CASH FLOWS (Unaudited)	5
	CONDENSED CONSOLIDATED STATEMENT OF EQUITY (Unaudited)	6
	NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS (Unaudited)	7
ITEM 2.	MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS	18
ITEM 3.	QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK	30
ITEM 4.	CONTROLS AND PROCEDURES	31
PART II—OTHER INFORMATION		31
ITEM 1.	LEGAL PROCEEDINGS	31
ITEM 1A.	RISK FACTORS	31
ITEM 2.	UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS	31
ITEM 6.	EXHIBITS	32
EXHIBIT INDEX		32
SIGNATURES		33

Cautionary Language Regarding Forward-Looking Statements

This Quarterly Report on Form 10-Q ("Form 10-Q") contains forward-looking statements that are based on our management's expectations as of the filing date of this report with the Securities and Exchange Commission ("SEC"). Statements that are not historical facts are hereby identified as forward-looking statements. In addition, words such as "estimate," "anticipate," "project," "plan," "intend," "believe," "expect," "likely," "predicted," "positioned," "continue," "target," "seek," "focus" and any variations of these words and similar expressions are intended to identify forward-looking statements. Such statements include plans, projections and estimates contained in "Part I—Item 2. Management's Discussion and Analysis of Financial Condition and Results of Operations" ("MD&A") and "Part I—Item 3. Quantitative and Qualitative Disclosures About Market Risk" herein. Such forward-looking statements include (1) benefits and opportunities stemming from our strategy, strategic position, business model and capabilities, (2) the strength and growth potential of the U.S. market for shared communications infrastructure investment, (3) expectations regarding anticipated growth in the wireless industry, and consumption of and demand for data, including growth in, and factors driving, consumption and demand, (4) potential benefits of our communications infrastructure (on an individual and collective basis) and expectations regarding demand therefore, including potential benefits and continuity of and factors driving such demand, (5) expectations regarding construction, including duration of our construction projects, and acquisition of communications infrastructure, (6) the utilization of our net operating loss carryforwards ("NOLs"), (7) expectations regarding wireless carriers' focus on improving network quality and expanding capacity, (8) expectations regarding continued increase in usage of high-bandwidth applications by organizations, (9) expected use of net proceeds from issuances under the commercial paper program ("CP Program"), (10) our full year outlook and the anticipated growth in our financial results, including future revenues and operating cash flows, and the expectations regarding our capital expenditures, as well as the factors impacting expected growth in financial results and the levels of capital expenditures, (11) expectations regarding our capital structure and the credit markets, our availability and cost of capital, capital allocation, our leverage ratio and interest coverage targets, our ability to service our debt and comply with debt covenants and the plans for and the benefits of any future refinancings, (12) the utility of certain financial measures, including non-GAAP financial measures, (13) expectations related to our ability to remain qualified as a real estate investment trust ("REIT") and the advantages, benefits or impact of, or opportunities created by, our REIT status, (14) adequacy, projected sources and uses of liquidity, (15) expectations regarding non-renewals of tenant contracts, (16) our dividend policy and the timing, amount, growth or tax characterization of our dividends, (17) the potential impact of novel coronavirus (COVID-19) pandemic and (18) the outcome of outstanding litigation. All future dividends are subject to declaration by our board of directors.

1

Such forward-looking statements should, therefore, be considered in light of various risks, uncertainties and assumptions, including prevailing market conditions, risk factors described in "Item 1A. Risk Factors" of the Annual Report on Form 10-K for the fiscal year ended December 31, 2020 ("2020 Form 10-K") and other factors. Should one or more of these risks or uncertainties materialize, or should underlying assumptions prove incorrect, actual results may vary materially from those expected.

Our filings with the SEC are available through the SEC website at www.sec.gov or through our investor relations website at investor.crowncastle.com. We use our investor relations website to disclose information about us that may be deemed to be material. We encourage investors, the media and others interested in us to visit our investor relations website from time to time to review up-to-date information or to sign up for e-mail alerts to be notified when new or updated information is posted on the site.

Interpretation

As used herein, the term "including," and any variation thereof, means "including without limitation." The use of the word "or" herein is not exclusive. Unless this Form 10-Q indicates otherwise or the context otherwise requires, the terms "we," "our," "our company," "the company" or "us" as used in this Form 10-Q refer to Crown Castle International Corp. ("CCIC") and its predecessor (organized in 1995), as applicable, each a Delaware corporation, and their subsidiaries. Additionally, unless the context suggests otherwise, references to "U.S." are to the United States of America and Puerto Rico, collectively. Capitalized terms used but not defined in this Form 10-Q have the same meaning given to them in the 2020 Form 10-K.

2

PART I—FINANCIAL INFORMATION

ITEM 1.FINANCIAL STATEMENTS

CROWN CASTLE INTERNATIONAL CORP. AND SUBSIDIARIES

CONDENSED CONSOLIDATED BALANCE SHEET (Unaudited)

(Amounts in millions, except par values)

	March 31, 2021		December 31, 2020
ASSETS
Current assets:
Cash and cash equivalents	$	254	$	232
Restricted cash	179		144
Receivables, net	412		431
Prepaid expenses	115		95
Other current assets	216		202
Total current assets	1,176		1,104
Deferred site rental receivables	1,389		1,408
Property and equipment, net of accumulated depreciation of $11,090 and $10,803, respectively	15,149		15,162
Operating lease right-of-use assets	6,514		6,464
Goodwill	10,078		10,078
Other intangible assets, net	4,324		4,433
Other assets, net	122		119
Total assets	$	38,752	$	38,768
LIABILITIES AND EQUITY
Current liabilities:
Accounts payable	$	187	$	230
Accrued interest	107		199
Deferred revenues	814		704
Other accrued liabilities	334		378
Current maturities of debt and other obligations	159		129
Current portion of operating lease liabilities	332		329
Total current liabilities	1,933		1,969
Debt and other long-term obligations	19,713		19,151
Operating lease liabilities	5,856		5,808
Other long-term liabilities	2,327		2,379
Total liabilities	29,829		29,307
Commitments and contingencies (note 8)
CCIC stockholders' equity:
Common stock, $0.01 par value; 600 shares authorized; shares issued and outstanding: March 31,2021—432 and December 31, 2020—431	4		4
Additional paid-in capital	17,917		17,933
Accumulated other comprehensive income (loss)	(3)		(4)
Dividends/distributions in excess of earnings	(8,995)		(8,472)
Total equity	8,923		9,461
Total liabilities and equity	$	38,752	$	38,768

See notes to condensed consolidated financial statements.

3

CROWN CASTLE INTERNATIONAL CORP. AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENT OF OPERATIONS AND

COMPREHENSIVE INCOME (LOSS) (Unaudited)

(Amounts in millions, except per share amounts)

	Three Months Ended March 31,
	2021		2020
Net revenues:
Site rental	$	1,369	$	1,310
Services and other	116		111
Net revenues	1,485		1,421
Operating expenses:
Costs of operations(a):
Site rental	381		375
Services and other	81		99
Selling, general and administrative	164		175
Asset write-down charges	3		4
Acquisition and integration costs	—		5
Depreciation, amortization and accretion	408		399
Total operating expenses	1,037		1,057
Operating income (loss)	448		364
Interest expense and amortization of deferred financing costs	(170)		(175)
Gains (losses) on retirement of long-term obligations	(143)		—
Interest income	1		1
Other income (expense)	(8)		—
Income (loss) before income taxes	128		190
Benefit (provision) for income taxes	(7)		(5)
Income (loss) from continuing operations	121		185
Discontinued operations (see notes 6 and 12):
Net gain (loss) from disposal of discontinued operations, net of tax	(63)		—
Income (loss) from discontinued operations, net of tax	(63)		—
Net income (loss) attributable to CCIC stockholders	58		185
Dividends/distributions on preferred stock	—		(28)
Net income (loss) attributable to CCIC common stockholders	$	58	$	157
Net income (loss)	$	58	$	185
Other comprehensive income (loss):
Foreign currency translation adjustments	1		(1)
Total other comprehensive income (loss)	1		(1)
Comprehensive income (loss) attributable to CCIC stockholders	$	59	$	184
Net income (loss) attributable to CCIC common stockholders, per common share:
Income (loss) from continuing operations, basic	$	0.28	$	0.38
Income (loss) from discontinued operations, basic	(0.15)		—
Net income (loss) attributable to CCIC common stockholders—basic	$	0.13	$	0.38
Income (loss) from continuing operations, diluted	$	0.28	$	0.38
Income (loss) from discontinued operations, diluted	(0.15)		—
Net income (loss) attributable to CCIC common stockholders—diluted	$	0.13	$	0.38
Weighted-average common shares outstanding:
Basic	432		416
Diluted	433		418

(a)Exclusive of depreciation, amortization and accretion shown separately.

See notes to condensed consolidated financial statements.

4

CROWN CASTLE INTERNATIONAL CORP. AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENT OF CASH FLOWS (Unaudited)

(In millions of dollars)

	Three Months Ended March 31,
	2021		2020
Cash flows from operating activities:
Income (loss) from continuing operations	$	121	$	185
Income (loss) from continuing operations to net cash provided by (used for) operating activities:
Depreciation, amortization and accretion	408		399
(Gains) losses on retirement of long-term obligations	143		—
Amortization of deferred financing costs and other non-cash interest, net	3		1
Stock-based compensation expense	33		37
Asset write-down charges	3		4
Deferred income tax (benefit) provision	1		1
Other non-cash adjustments, net	10		—
Changes in assets and liabilities, excluding the effects of acquisitions:
Increase (decrease) in accrued interest	(92)		(50)
Increase (decrease) in accounts payable	(23)		(20)
Increase (decrease) in other liabilities	(31)		2
Decrease (increase) in receivables	18		102
Decrease (increase) in other assets	(10)		(8)
Net cash provided by (used for) operating activities	584		653
Cash flows from investing activities:
Capital expenditures	(302)		(447)
Payments for acquisitions, net of cash acquired	(4)		(13)
Other investing activities, net	(5)		(8)
Net cash provided by (used for) investing activities	(311)		(468)
Cash flows from financing activities:
Proceeds from issuance of long-term debt	3,237		—
Principal payments on debt and other long-term obligations	(1,026)		(26)
Purchases and redemptions of long-term debt	(1,789)		—
Borrowings under revolving credit facility	580		1,340
Payments under revolving credit facility	(290)		(595)
Net issuances (repayments) under commercial paper program	(245)		(155)
Payments for financing costs	(29)		—
Purchases of common stock	(67)		(73)
Dividends/distributions paid on common stock	(588)		(513)
Dividends/distributions paid on preferred stock	—		(28)
Net cash provided by (used for) financing activities	(217)		(50)
Net increase (decrease) in cash, cash equivalents, and restricted cash	56		135
Effect of exchange rate changes	1		(1)
Cash, cash equivalents, and restricted cash at beginning of period	381		338
Cash, cash equivalents, and restricted cash at end of period	$	438	$	472

See notes to condensed consolidated financial statements.

5

CROWN CASTLE INTERNATIONAL CORP. AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENT OF EQUITY

(Amounts in millions) (Unaudited)

	Common Stock			6.875% Mandatory Convertible Preferred Stock					Accumulated Other Comprehensive Income (Loss) ("AOCI")
	Shares	($0.01 Par)		Shares	($0.01 Par)		Additional paid-in capital		Foreign Currency Translation Adjustments		Dividends/Distributions in Excess of Earnings		Total
Balance, December 31, 2020	431	$	4	—	$	—	$	17,933	$	(4)	$	(8,472)	$	9,461
Stock-based compensation related activity, net of forfeitures	1	—		—	—		51		—		—		51
Purchases and retirement of common stock	—	—		—	—		(67)		—		—		(67)
Other comprehensive income (loss)(a)	—	—		—	—		—		1		—		1
Common stock dividends/distributions(b)	—	—		—	—		—		—		(581)		(581)
Net income (loss)	—	—		—	—		—		—		58		58
Balance, March 31, 2021	432	$	4	—	$	—	$	17,917	$	(3)	$	(8,995)	$	8,923

	Common Stock			6.875% Mandatory Convertible Preferred Stock					AOCI
	Shares	($0.01 Par)		Shares	($0.01 Par)		Additional paid-in capital		Foreign Currency Translation Adjustments		Dividends/Distributions in Excess of Earnings		Total
Balance, December 31, 2019	416	$	4	2	$	—	$	17,855	$	(5)	$	(7,365)	$	10,489
Stock-based compensation related activity, net of forfeitures	1	—		—	—		53		—		—		53
Purchases and retirement of common stock	—	—		—	—		(73)		—		—		(73)
Other comprehensive income (loss)(a)	—	—		—	—		—		(1)		—		(1)
Common stock dividends/distributions(b)	—	—		—	—		—		—		(504)		(504)
Preferred stock dividends/distributions(b)	—	—		—	—		—		—		(28)		(28)
Net income (loss)	—	—		—	—		—		—		185		185
Balance, March 31, 2020	417	$	4	2	$	—	$	17,835	$	(6)	$	(7,712)	$	10,121

(a)See the condensed consolidated statement of operations and other comprehensive income (loss) for the components of other comprehensive income (loss).

(b)See note 7 for information regarding common and preferred stock dividends declared per share.

6

CROWN CASTLE INTERNATIONAL CORP. AND SUBSIDIARIES

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS-Unaudited

(Tabular dollars in millions, except per share amounts)

1.General

The information contained in the following notes to the condensed consolidated financial statements is condensed from that which would appear in the annual consolidated financial statements; accordingly, the condensed consolidated financial statements included herein should be reviewed in conjunction with the consolidated financial statements for the fiscal year ended December 31, 2020, and related notes thereto, included in the 2020 Form 10-K filed by Crown Castle International Corp. ("CCIC") with the SEC. Capitalized terms used but not defined in these notes to the condensed consolidated financial statements have the same meaning given to them in the 2020 Form 10-K. References to the "Company" refer to CCIC and its predecessor, as applicable, and their subsidiaries, unless otherwise indicated or the context indicates otherwise. As used herein, the term "including," and any variation thereof means "including without limitation." The use of the word "or" herein is not exclusive. Unless the context suggests otherwise, references to "U.S." are to the United States of America and Puerto Rico, collectively.

The Company owns, operates and leases shared communications infrastructure that is geographically dispersed throughout the U.S., including (1) towers and other structures, such as rooftops (collectively, "towers"), and (2) fiber primarily supporting small cell networks ("small cells") and fiber solutions. The Company's towers, fiber and small cells assets are collectively referred to herein as "communications infrastructure," and the Company's customers on its communications infrastructure are referred to herein as "tenants."

The Company's core business is providing access, including space or capacity, to its shared communications infrastructure via long-term contracts in various forms, including lease, license, sublease and service agreements (collectively, "tenant contracts").

The Company's operating segments consist of (1) Towers and (2) Fiber. See note 10.

As part of the Company's effort to provide comprehensive communications infrastructure solutions, as an ancillary business, the Company also offers certain services primarily relating to its Towers segment, predominately consisting of (1) site development services primarily relating to existing or new tenant equipment installations, including: site acquisition, architectural and engineering, or zoning and permitting (collectively, "site development services") and (2) tenant equipment installation or subsequent augmentations (collectively, "installation services").

The Company operates as a REIT for U.S. federal income tax purposes. In addition, the Company has certain taxable REIT subsidiaries ("TRSs"). See note 6.

Approximately 53% of the Company's towers are leased or subleased or operated and managed under master leases, subleases, and other agreements with AT&T and T-Mobile, including agreements assumed by T-Mobile following its merger with Sprint, completed on April 1, 2020. The Company has the option to purchase these towers at the end of their respective lease terms. The Company has no obligation to exercise such purchase options.

Basis of Presentation

The condensed consolidated financial statements included herein are unaudited; however, they include all adjustments (consisting only of normal recurring adjustments) which, in the opinion of management, are necessary to state fairly the consolidated financial position of the Company at March 31, 2021, the condensed consolidated results of operations for the three months ended March 31, 2021 and 2020, and the condensed consolidated cash flows for the three months ended March 31, 2021 and 2020. The year-end condensed consolidated balance sheet data was derived from audited financial statements, but does not include all disclosures required by GAAP. The results of operations for the interim periods presented are not necessarily indicative of the results to be expected for the full year.

The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities as of the date of the financial statements, and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.

2.Summary of Significant Accounting Policies

Recently Adopted Accounting Pronouncements

7

No accounting pronouncements adopted during the three months ended March 31, 2021 had a material impact on the Company's condensed consolidated financial statements.

Recent Accounting Pronouncements Not Yet Adopted

No new accounting pronouncements issued but not yet adopted are expected to have a material impact on the Company's condensed consolidated financial statements.

3.Revenues

Site rental revenues

The Company generates site rental revenues from its core business by providing tenants with access, including space or capacity, to its shared communications infrastructure via long-term tenant contracts in various forms, including lease, license, sublease and service agreements. Providing such access over the length of the tenant contract term represents the Company’s sole performance obligation under its tenant contracts.

Site rental revenues from the Company's tenant contracts are recognized on a straight-line, ratable basis over the fixed, non-cancelable term of the relevant tenant contract, which generally ranges from five to 15 years for wireless tenants and three to 20 years for the Company's fiber solutions tenants (including from organizations with high-bandwidth and multi-location demands), regardless of whether the payments from the tenant are received in equal monthly amounts during the life of the tenant contract. Certain of the Company's tenant contracts contain (1) fixed escalation clauses (such as fixed dollar or fixed percentage increases) or inflation-based escalation clauses (such as those tied to the CPI), (2) multiple renewal periods exercisable at the tenant's option and (3) only limited termination rights at the applicable tenant's option through the current term. If the payment terms call for fixed escalations, upfront payments, or rent-free periods, the revenue is recognized on a straight-line basis over the fixed, non-cancelable term of the agreement. When calculating straight-line rental revenues, the Company considers all fixed elements of tenant contractual escalation provisions, even if such escalation provisions contain a variable element in addition to a minimum. The Company's assets related to straight-line site rental revenues include current amounts of $163 million included in "Other current assets" and non-current amounts of $1.4 billion included in "Deferred site rental receivables" as of March 31, 2021. Amounts billed or received prior to being earned are deferred and reflected in "Deferred revenues" and "Other long-term liabilities." Amounts to which the Company has an unconditional right to payment, which are related to both satisfied or partially satisfied performance obligations, are recorded within "Receivables, net" on the Company's condensed consolidated balance sheet.

Services and other revenues

As part of the Company’s effort to provide comprehensive communications infrastructure solutions, as an ancillary business, the Company offers certain services primarily relating to its Towers segment, predominately consisting of (1) site development services and (2) installation services. Upon contract commencement, the Company assesses its services to tenants and identifies performance obligations for each promise to provide a distinct service.

The Company may have multiple performance obligations for site development services, which primarily include: structural analysis, zoning, permitting and construction drawings. For each of the above performance obligations, services revenues are recognized at completion of the applicable performance obligation, which represents the point at which the Company believes it has transferred goods or services to the tenant. The revenue recognized is based on an allocation of the transaction price among the performance obligations in a respective contract based on estimated standalone selling price. The volume and mix of site development services may vary among contracts and may include a combination of some or all of the above performance obligations. Payments generally are due within 45 to 60 days and generally do not contain variable-consideration provisions. The transaction price for the Company's tower installation services consists of amounts for (1) permanent improvements to the Company's towers that represent a lease component and (2) the performance of the service. Amounts under the Company's tower installation service agreements that represent a lease component are recognized as site rental revenues on a straight-line basis over the length of the associated estimated lease term. For the performance of the installation service, the Company has one performance obligation, which is satisfied at the time of the applicable installation or augmentation and recognized as services and other revenues. Since performance obligations are typically satisfied prior to receiving payment from tenants, the unconditional right to payment is recorded within "Receivables, net" on the Company’s condensed consolidated balance sheet. The vast majority of the Company’s services generally have a duration of one year or less.

8

Additional information on revenues

As of both January 1, 2021 and March 31, 2021, $2.8 billion of unrecognized revenue was reported in "Deferred revenues" and "Other long-term liabilities" on our condensed consolidated balance sheet. During the three months ended March 31, 2021, approximately $170 million of the January 1, 2020 unrecognized revenue balance was recognized as revenue. During the three months ended March 31, 2020, approximately $160 million of the January 1, 2020 unrecognized revenue balance was recognized as revenue.

The following table is a summary of the non-cancelable contracted amounts owed to the Company by tenants pursuant to tenant contracts in effect as of March 31, 2021.

	Nine Months Ending December 31,		Years Ending December 31,
	2021		2022		2023		2024		2025		Thereafter		Total
Contracted amounts(a)	$	3,381	$	4,228	$	3,640	$	2,936	$	2,443	$	9,979	$	26,607

(a)Based on the nature of the contract, tenant contracts are accounted for pursuant to relevant lease accounting (ASC 842) or revenue accounting (ASC 606) guidance. Excludes amounts related to services, as those contracts generally have a duration of one year or less.

See note 10 for further information regarding the Company's operating segments.

9

4.Debt and Other Obligations

The table below sets forth the Company's debt and other obligations as of March 31, 2021.

	Original Issue Date		Final Maturity Date(a)		Balance as of March 31, 2021			Balance as of December 31, 2020		Stated Interest Rate as of March 31, 2021(a)
3.849% Secured Notes	Dec. 2012		Apr. 2023		$	997		$	997	3.9	%
Secured Notes, Series 2009-1, Class A-2	July 2009		Aug. 2029		59			60		9.0	%
Tower Revenue Notes, Series 2015-1	May 2015		May 2042	(b)	299			299		3.2	%
Tower Revenue Notes, Series 2018-1	July 2018		July 2043	(b)	249			248		3.7	%
Tower Revenue Notes, Series 2015-2	May 2015		May 2045	(b)	696			695		3.7	%
Tower Revenue Notes, Series 2018-2	July 2018		July 2048	(b)	743			743		4.2	%
Finance leases and other obligations	Various		Various	(c)	231			236		Various		(c)
Total secured debt					$	3,274		$	3,278
2016 Revolver	Jan. 2016		June 2024		$	580	(d)	$	290	1.2	%	(e)
2016 Term Loan A	Jan. 2016		June 2024	(g)	1,237			2,252		1.2	%	(e)
Commercial Paper Notes	Mar. 2021	(f)	Apr. 2021	(f)(g)	40		(f)	285		0.4	%
5.250% Senior Notes	Oct. 2012		Jan. 2023	(g)	—			1,646		5.3	%
3.150% Senior Notes	Jan. 2018		July 2023		746			746		3.2	%
3.200% Senior Notes	Aug. 2017		Sept. 2024		746			745		3.2	%
1.350% Senior Notes	June 2020		July 2025		495			494		1.4	%
4.450% Senior Notes	Feb. 2016		Feb. 2026		895			894		4.5	%
3.700% Senior Notes	May 2016		June 2026		745			745		3.7	%
1.050% Senior Notes	Feb. 2021		July 2026	(g)	989			—		1.1	%
4.000% Senior Notes	Feb. 2017		Mar. 2027		496			496		4.0	%
3.650% Senior Notes	Aug. 2017		Sept. 2027		994			994		3.7	%
3.800% Senior Notes	Jan. 2018		Feb. 2028		991			991		3.8	%
4.300% Senior Notes	Feb. 2019		Feb. 2029		593			593		4.3	%
3.100% Senior Notes	Aug. 2019		Nov. 2029		544			544		3.1	%
3.300% Senior Notes	Apr. 2020		July 2030		737			737		3.3	%
2.250% Senior Notes	June 2020		Jan. 2031		1,088			1,088		2.3	%
2.100% Senior Notes	Feb. 2021		Apr. 2031	(g)	987			—		2.1	%
2.900% Senior Notes	Feb. 2021		Apr. 2041	(g)	1,233			—		2.9	%
4.750% Senior Notes	May 2017		May 2047		344			344		4.8	%
5.200% Senior Notes	Feb. 2019		Feb. 2049		395			395		5.2	%
4.000% Senior Notes	Aug. 2019		Nov. 2049		345			345		4.0	%
4.150% Senior Notes	Apr. 2020		July 2050		489			489		4.2	%
3.250% Senior Notes	June 2020		Jan. 2051		889			889		3.3	%
Total unsecured debt					$	16,598		$	16,002
Total debt and other obligations					19,872			19,280
Less: current maturities and short-term debt and other current obligations					159			129
Non-current portion of long-term debt and other long-term obligations					$	19,713		$	19,151

(a)See the 2020 Form 10-K, including note 7, for additional information regarding the maturity and principal amortization provisions and interest rates relating to the Company's indebtedness.

(b)If the respective series of Tower Revenue Notes are not paid in full on or prior to an applicable anticipated repayment date, then Excess Cash Flow (as defined in the indenture) of the issuers of such notes will be used to repay principal of the applicable series and class of the Tower Revenue Notes, and additional interest (of an additional approximately 5% per annum) will accrue on the respective Tower Revenue Notes. As of March 31, 2021, the Tower Revenue Notes have principal amounts of $300 million, $250 million, $700 million and $750 million, with anticipated repayment dates in 2022, 2023, 2025 and 2028, respectively.

(c)The Company's finance leases and other obligations relate to land, fiber, vehicles, and other assets and bear interest rates ranging up to 10% and mature in periods ranging from less than one year to approximately 25 years.

(d)As of March 31, 2021, the undrawn availability under the 2016 Revolver was $4.4 billion.

(e)Both the 2016 Revolver and 2016 Term Loan A bear interest, at our option, at either (1) LIBOR plus a credit spread ranging from 0.875% to 1.750% per annum or (2) an alternate base rate plus a credit spread ranging from 0.000% to 0.750% per annum, in each case, with the applicable credit spread based

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on the Company's senior unsecured debt rating. The Company pays a commitment fee ranging from 0.125% to 0.350%, based on the Company's senior unsecured debt rating, per annum on the undrawn available amount under the 2016 Revolver.

(f)Notes under the CP Program may be issued, repaid and re-issued from time to time, with an aggregate principal amount of Commercial Paper Notes outstanding under the CP Program at any time not to exceed $1.0 billion. The net proceeds of the Commercial Paper Notes are expected to be used for general corporate purposes. The maturities of the Commercial Paper Notes, when outstanding, may vary but may not exceed 397 days from the date of issue. The Commercial Paper Notes are issued under customary terms in the commercial paper market and are issued at a discount from par or, alternatively, can be issued at par and bear varying interest rates on a fixed or floating basis. As of March 31, 2021, the Company had net issuances of $40 million under the CP Program. At any point in time, the Company intends to maintain available commitments under its 2016 Revolver in an amount at least equal to the amount of Commercial Paper Notes outstanding. While any outstanding Commercial Paper Notes generally have short-term maturities, the Company classifies the outstanding issuances, when applicable, as long-term based on its ability and intent to refinance the outstanding issuances on a long-term basis.

(g)In February 2021, the Company issued $3.25 billion aggregate principal amount of senior unsecured notes ("February 2021 Senior Notes"), which consisted of (1) $1.0 billion aggregate principal amount of 1.050% senior unsecured notes due July 2026, (2) $1.0 billion aggregate principal amount of 2.100% senior unsecured notes due April 2031 and (3) $1.25 billion aggregate principal amount of 2.900% senior unsecured notes due April 2041. The Company used the net proceeds from the February 2021 Senior Notes offering to (1) redeem all of the outstanding 5.250% Senior Notes, (2) repay a portion of the outstanding Commercial Paper Notes and (3) repay a portion of outstanding borrowings under the 2016 Term Loan A.

Scheduled Principal Payments and Final Maturities

The following are the scheduled principal payments and final maturities of the total debt and other long-term obligations of the Company outstanding as of March 31, 2021, which do not consider the principal payments that will commence following the anticipated repayment dates on the Tower Revenue Notes.

	Nine Months Ending December 31,		Years Ending December 31,												Unamortized Adjustments, Net		Total Debt and Other Obligations Outstanding
	2021		2022		2023		2024		2025		Thereafter		Total Cash Obligations
Scheduled principal payments and final maturities	$	161	$	155	$	1,988	$	2,187	$	525	$	15,032	$	20,048	$	(176)	$	19,872

Purchases and Redemptions of Long-Term Debt

The following is a summary of purchases and redemptions of long-term debt during the three months ended March 31, 2021.

	Principal Amount		Cash Paid(a)		Gains (Losses)(b)
5.250% Senior Notes	$	1,650	$	1,789	$	(143)
Total	$	1,650	$	1,789	$	(143)

(a)Exclusive of accrued interest.

(b)Inclusive of the write off of respective deferred financing costs.

Interest Expense and Amortization of Deferred Financing Costs

The components of interest expense and amortization of deferred financing costs are as follows:

	Three Months Ended March 31,
	2021		2020
Interest expense on debt obligations	$	167	$	174
Amortization of deferred financing costs and adjustments on long-term debt	6		5
Capitalized interest	(3)		(4)
Total	$	170	$	175

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5.Fair Value Disclosures

	Level in Fair Value Hierarchy	March 31, 2021				December 31, 2020
		Carrying  Amount		Fair Value		Carrying  Amount		Fair Value
Assets:
Cash and cash equivalents	1	$	254	$	254	$	232	$	232
Restricted cash, current and non-current	1	184		184		149		149
Liabilities:
Total debt and other obligations	2	19,872		20,718		19,280		21,302

The fair value of cash and cash equivalents and restricted cash approximate the carrying value. The Company determines the fair value of its debt securities based on indicative, non-binding quotes from brokers. Quotes from brokers require judgment and are based on the brokers' interpretation of market information, including implied credit spreads for similar borrowings on recent trades or bid/ask prices or quotes from active markets if available. Since December 31, 2020, there have been no changes in the Company's valuation techniques used to measure fair values.

6.Income Taxes

The Company operates as a REIT for U.S. federal income tax purposes. As a REIT, the Company is generally entitled to a deduction for dividends that it pays and therefore is not subject to U.S. federal corporate income tax on its net taxable income that is currently distributed to its stockholders. The Company also may be subject to certain federal, state, local and foreign taxes on its income and assets, including (1) taxes on any undistributed income, (2) taxes related to the TRSs, (3) franchise taxes, (4) property taxes, and (5) transfer taxes. In addition, the Company could under certain circumstances be required to pay an excise or penalty tax, which could be significant in amount, in order to utilize one or more relief provisions under the Internal Revenue Code of 1986, as amended, to maintain qualification for taxation as a REIT.

The Company's TRS assets and operations will continue to be subject, as applicable, to federal and state corporate income taxes or to foreign taxes in the jurisdictions in which such assets and operations are located. The Company's foreign assets and operations (including its tower operations in Puerto Rico) are subject to foreign income taxes in the jurisdictions in which such assets and operations are located, regardless of whether they are included in a TRS or not.

For the three months ended March 31, 2021 and 2020, the Company's effective tax rate differed from the federal statutory rate predominately due to the Company's REIT status, including the dividends paid deduction.

See also note 12 for a discussion of the Company's agreement in principle with the Australian Taxation Office ("ATO").

7.Per Share Information

Basic net income (loss) attributable to CCIC common stockholders, per common share, excludes dilution and is computed by dividing net income (loss) attributable to CCIC common stockholders by the weighted-average number of common shares outstanding during the period. For the three months ended March 31, 2021 and 2020, diluted net income (loss) attributable to CCIC common stockholders, per common share, is computed by dividing net income (loss) attributable to CCIC common stockholders by the weighted-average number of common shares outstanding during the period, plus any potential dilutive common share equivalents, including shares issuable upon (1) the vesting of restricted stock units as determined under the treasury stock method and (2) conversion of the Company's previously outstanding 6.875% Mandatory Convertible Preferred Stock, as applicable, as determined under the if-converted method.

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	Three Months Ended March 31,
	2021		2020
Income (loss) from continuing operations	$	121	$	185
Dividends on preferred stock	—		(28)
Income (loss) from continuing operations attributable to CCIC common stockholders for basic and diluted computations	$	121	$	157
Income (loss) from discontinued operations, net of tax	$	(63)	$	—
Net income (loss) attributable to CCIC common stockholders	$	58	$	157
Weighted-average number of common shares outstanding (in millions):
Basic weighted-average number of common stock outstanding	432		416
Effect of assumed dilution from potential issuance of common shares relating to restricted stock units	1		2
Diluted weighted-average number of common shares outstanding	433		418
Net income (loss) attributable to CCIC common stockholders, per common share:
Income (loss) from continuing operations, basic	$	0.28	$	0.38
Income (loss) from discontinued operations, basic	(0.15)		—
Net income (loss) attributable to CCIC common stockholders—basic	$	0.13	$	0.38
Income (loss) from continuing operations, diluted	$	0.28	$	0.38
Income (loss) from discontinued operations, diluted	(0.15)		—
Net income (loss) attributable to CCIC common stockholders—diluted	$	0.13	$	0.38
Dividends/distributions declared per share of common stock	$	1.33	$	1.20
Dividends/distributions declared per share of preferred stock	$	—	$	17.1875

During the three months ended March 31, 2021, the Company granted one million restricted stock units to the Company's executives and certain other employees pursuant to its 2013 Long-Term Incentive Plan.

For the three months ended March 31, 2020, approximately 14.5 million common share equivalents related to the previously outstanding 6.875% Mandatory Convertible Preferred Stock were excluded from the dilutive common shares because the impact of such conversion would be anti-dilutive, based on the Company's common stock price as of March 31, 2020.

8.Commitments and Contingencies

Shareholder Litigation

In February and March 2020, putative securities class action suits were filed in the United States District Court for the District of New Jersey against the Company and certain of its current officers. The lawsuits were filed on behalf of investors that purchased or otherwise acquired stock of the Company between February 26, 2018 and February 26, 2020. The allegations concern allegedly false or misleading statements or other alleged failures to disclose information about the Company's business, operations and prospects. The plaintiffs seek monetary damages and the award of the plaintiffs' costs and expenses incurred. In December 2020, the cases were consolidated as In re Crown Castle International Corp. Securities Litigation, No. 2:20-cv-02156 in the United States District Court for the District of New Jersey. The Company is currently unable to determine the likelihood of an outcome or estimate a range of reasonably possible losses, if any. The Company believes the putative class action is without merit and intends to defend itself vigorously.

During the quarter ended June 30, 2020, derivative lawsuits were filed in the United States District Court for the District of Delaware, against the Company's then-current directors and certain of its current officers and the Company as a nominal defendant. Each complaint alleges, among other things, breaches of fiduciary duties, waste of corporate assets, unjust enrichment, and false or misleading statements. The derivative plaintiffs seek, among other things, unspecified monetary damages, costs and expenses, restitution from the defendants, and an order requiring the Company to implement certain

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corporate governance reforms. As a nominal defendant, no monetary relief is sought against the Company itself. In June 2020, the derivative lawsuits were consolidated as In re Crown Castle International Corp. Derivative Litigation, C.A. No. 20-00606-MN in the United States District Court for the District of Delaware. The consolidated derivative action is currently stayed pending the resolution of any motion to dismiss In re Crown Castle International Corp. Securities Litigation in the United States District Court for the District of New Jersey.

Durham Lawsuits

The Company has received notices of claims and has been named as one of several defendants in lawsuits stemming from an April 2019 gas leak explosion in Durham, North Carolina, which occurred near an area where the Company's subcontractors were installing fiber. The explosion resulted in two fatalities, physical injuries (some of which were serious), and property damage to surrounding buildings and businesses. Currently, the Company is unable to determine the likelihood of an outcome or estimate a range of possible losses, if any, related to these lawsuits.

New York State Department of Transportation

In 2019, the State of New York passed legislation authorizing the Department of Transportation ("NYSDOT") to enter into agreements with any fiber provider for the use and occupancy of the state right-of-way for fiber optic lines. The legislation authorizes the NYSDOT to charge a fee of up to fair market value for such use and occupancy. To date, the Company has paid fees relating to newly deployed fiber lines but has not been required to pay, and has not recognized any costs in connection with, any fees relating to previously deployed fiber lines.

The Company believes that the legislation violates both federal and state law and is evaluating its legal options regarding any use and occupancy fees that may be assessed on previously deployed fiber. Currently, the Company is unable to determine the likelihood of an outcome or reasonably estimate the amount of fees, if any, that it may be required to pay as a result of the legislation.

Other Matters

The Company is involved in various other claims, assessments, lawsuits or proceedings arising in the ordinary course of business. While there are uncertainties inherent in the ultimate outcome of such other matters and it is impossible to presently determine the ultimate costs or losses that may be incurred, if any, management believes the adverse resolution of such uncertainties and the incurrence of such costs should not have a material adverse effect on the Company's condensed consolidated financial position or results of operations. Additionally, the Company and certain of its subsidiaries are contingently liable for commitments or performance guarantees arising in the ordinary course of business, including certain letters of credit or surety bonds. In addition, see note 1 for a discussion of the Company's option to purchase approximately 53% of its towers at the end of their respective lease terms. The Company has no obligation to exercise such purchase options.

9.Equity

Declaration and Payment of Dividends

During the three months ended March 31, 2021, the following dividends/distributions were declared or paid:

Equity Type	Declaration Date	Record Date	Payment Date	Dividends Per Share		Aggregate Payment Amount
Common Stock	February 18, 2021	March 15, 2021	March 31, 2021	$	1.33	$	581	(a)

(a)Inclusive of dividends accrued for holders of unvested restricted stock units, which will be paid when and if the restricted stock units vest.

Purchases of the Company's Common Stock

For the three months ended March 31, 2021, the Company purchased 0.4 million shares of its common stock utilizing $67 million in cash. The shares of common stock purchased relate to shares withheld in connection with the payment of withholding taxes upon vesting of restricted stock units.

2018 "At-the-Market" Stock Offering Program

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The Company previously maintained an "at-the-market" stock offering program through which it had the right to issue and sell shares of its common stock having an aggregate gross sales price of up to $750 million ("2018 ATM Program"). The Company terminated its previously outstanding 2018 ATM Program in March 2021 with the entire gross sales price of $750 million remaining unsold.

2021 "At-the-Market" Stock Offering Program

In March 2021, the Company established a new "at-the-market" stock offering program through which it may issue and sell shares of its common stock having an aggregate gross sales price of up to $750 million ("2021 ATM Program"). Sales under the 2021 ATM Program may be made by means of ordinary brokers' transactions on the NYSE or otherwise at market prices prevailing at the time of sale, at prices related to prevailing market prices or, subject to the Company's specific instructions, at negotiated prices. The Company intends to use the net proceeds from any sales under the 2021 ATM Program for general corporate purposes, which may include (1) the funding of future acquisitions or investments or (2) the repayment or repurchase of any outstanding indebtedness. The Company has not sold any shares of common stock under the 2021 ATM Program.

10.Operating Segments

The Company's operating segments consist of (1) Towers and (2) Fiber. The Towers segment provides access, including space or capacity, to the Company's approximately 40,000 towers geographically dispersed throughout the U.S. The Towers segment also reflects certain ancillary services relating to the Company's towers, predominately consisting of site development services and installation services. The Fiber segment provides access, including space or capacity, to the Company's approximately 80,000 route miles of fiber primarily supporting small cell networks and fiber solutions geographically dispersed throughout the U.S.

The measurements of profit or loss used by the Company's chief operating decision maker ("CODM") to evaluate the performance of its operating segments are (1) segment site rental gross margin, (2) segment services and other gross margin and (3) segment operating profit. The Company defines segment site rental gross margin as segment site rental revenues less segment site rental cost of operations, which excludes stock-based compensation expense and prepaid lease purchase price adjustments recorded in consolidated cost of operations. The Company defines segment services and other gross margin as segment services and other revenues less segment services and other cost of operations, which excludes stock-based compensation expense recorded in consolidated cost of operations. The Company defines segment operating profit as segment site rental gross margin plus segment services and other gross margin, and segment other operating (income) expense, less selling, general and administrative expenses attributable to the respective segment. All of these measurements of profit or loss are exclusive of depreciation, amortization and accretion, which are shown separately.

The following tables set forth the Company's segment operating results for the three months ended March 31, 2021 and 2020. Costs that are directly attributable to Towers and Fiber are assigned to those respective segments. Additionally, certain costs are shared across segments and are reflected in the Company's segment measures through allocations that management believes to be reasonable. The "Other" column (1) represents amounts excluded from specific segments, such as asset write-down charges, acquisition and integration costs, depreciation, amortization and accretion, amortization of prepaid lease purchase price adjustments, interest expense and amortization of deferred financing costs, gains (losses) on retirement of long-term obligations, net gain (loss) on interest rate swaps, gains (losses) on foreign currency swaps, interest income, other income (expense), income (loss) from discontinued operations, and stock-based compensation expense, and (2) reconciles segment operating profit to income (loss) before income taxes, as the amounts are not utilized in assessing each segment’s performance. The "Other" total assets balance includes corporate assets such as cash and cash equivalents which have not been allocated to specific segments. There are no significant revenues resulting from transactions between the Company's operating segments.

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	Three Months Ended March 31, 2021								Three Months Ended March 31, 2020
	Towers		Fiber		Other		Consolidated Total		Towers		Fiber		Other		Consolidated Total
Segment site rental revenues	$	895	$	474			$	1,369	$	867	$	443			$	1,310
Segment services and other revenues	111		5				116		108		3				111
Segment revenues	1,006		479				1,485		975		446				1,421
Segment site rental cost of operations	212		161				373		214		152				366
Segment services and other cost of operations	76		3				79		95		2				97
Segment cost of operations(a)(b)	288		164				452		309		154				463
Segment site rental gross margin	683		313				996		653		291				944
Segment services and other gross margin	35		2				37		13		1				14
Segment selling, general and administrative expenses(b)	25		45				70		24		51				75
Segment operating profit (loss)	693		270				963		642		241				883
Other selling, general and administrative expenses					$	66	66						$	70	70
Stock-based compensation expense					33		33						36		36
Depreciation, amortization and accretion					408		408						399		399
Interest expense and amortization of deferred financing costs					170		170						175		175
Other (income) expenses to reconcile to income (loss) before income taxes(c)					158		158						13		13
Income (loss) before income taxes							$	128							$	190
Capital expenditures	$	51	$	237	$	14	$	302	$	105	$	328	$	14	$	447
Total assets (at period end)	$	22,080	$	15,771	$	901	$	38,752	$	22,234	$	15,520	$	862	$	38,616

(a)Exclusive of depreciation, amortization and accretion shown separately.

(b)Segment cost of operations excludes (1) stock-based compensation of $5 million and $6 million for the three months ended March 31, 2021 and 2020, respectively, and (2) prepaid lease purchase price adjustments of $5 million for both of the three months ended March 31, 2021 and 2020. Selling, general and administrative expenses exclude stock-based compensation expense of $28 million and $30 million for the three months ended March 31, 2021 and 2020, respectively.

(c)See condensed consolidated statement of operations for further information.

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11.Supplemental Cash Flow Information

The following table is a summary of the Company's supplemental cash flow information:

	Three Months Ended March 31,
	2021		2020
Supplemental disclosure of cash flow information:
Cash payments related to operating lease liabilities(a)	$	137	$	135
Interest paid	259		223
Income taxes paid	—		1
Supplemental disclosure of non-cash operating, investing and financing activities:
New ROU assets obtained in exchange for operating lease liabilities	132		133
Increase (decrease) in accounts payable for purchases of property and equipment	(18)		(18)
Purchase of property and equipment under finance leases and installment purchases	4		5

(a)Excludes the Company's contingent payments pursuant to operating leases, which are recorded as expense in the period such contingencies are resolved.

The reconciliation of cash, cash equivalents, and restricted cash reported within various lines on the condensed consolidated balance sheet to amounts reported in the condensed consolidated statement of cash flows is shown below.

	March 31, 2021		December 31, 2020
Cash and cash equivalents	$	254	$	232
Restricted cash, current	179		144
Restricted cash reported within other assets, net	5		5
Cash, cash equivalents and restricted cash	$	438	$	381

12.Subsequent Events

On April 26, 2021, the Company entered into an agreement in principle with the ATO to pay approximately $63 million (A$83 million) to settle the previously-disclosed outstanding audit of the Australian tax consequences of the Company’s 2015 sale of Crown Castle Australia Holdings Pty Ltd ("CCAL"), formerly a 77.6% owned Australian subsidiary of the Company ("ATO Settlement"). The sale of CCAL generated approximately $1.2 billion in net proceeds to the Company, and resulted in a gain from the disposal of discontinued operations of $979 million for the year ended December 31, 2015.

The ATO Settlement was reflected in the condensed consolidated financial statements of the Company as of and for the three months ended March 31, 2021. The Company recognized the ATO settlement as a charge within discontinued operations in its condensed consolidated statement of operations and comprehensive income (loss) for the three months ended March 31, 2021, as this amount represents a reduction to the gain from the disposal of discontinued operations previously reported during the year ended December 31, 2015. Additionally, the ATO Settlement was recorded within "Other accrued liabilities" on the Company’s condensed consolidated balance sheet as of March 31, 2021.

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ITEM 2.MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

The following discussion should be read in conjunction with the response to Part I, Item 1 of this report and the consolidated financial statements of the Company including the related notes and "Item 7. Management's Discussion and Analysis of Financial Condition and Results of Operations" ("MD&A") included in the 2020 Form 10-K.

General Overview

Overview

We own, operate and lease shared communications infrastructure that is geographically dispersed throughout the U.S., including approximately (1) 40,000 towers and (2) 80,000 route miles of fiber primarily supporting small cells and fiber solutions.

Our towers have a significant presence in the top 100 basic trading areas ("BTAs"), and the majority of our small cells and fiber is located in major metropolitan areas. Site rental revenues represented 92% of our first quarter 2021 consolidated net revenues. Our Towers segment and Fiber segment accounted for 65% and 35%, respectively, of our first quarter 2021 site rental revenues. Within our Fiber segment, 70% and 30% of our first quarter 2021 Fiber site rental revenues related to fiber solutions and small cells, respectively. See note 10 to our condensed consolidated financial statements. The vast majority of our site rental revenues is of a recurring nature and is subject to long-term tenant contracts with our tenants.

Strategy

As a leading provider of shared communications infrastructure in the U.S., our strategy is to create long-term stockholder value via a combination of (1) growing cash flows generated from our existing portfolio of communications infrastructure, (2) returning a meaningful portion of our cash generated by operating activities to our common stockholders in the form of dividends and (3) investing capital efficiently to grow cash flows and long-term dividends per share. Our strategy is based, in part, on our belief that the U.S. is the most attractive market for shared communications infrastructure investment with the greatest long-term growth potential. We measure our efforts to create "long-term stockholder value" by the combined payment of dividends to stockholders and growth in our per-share results. The key elements of our strategy are to:

•Grow cash flows from our existing communications infrastructure. We are focused on maximizing the recurring site rental cash flows generated from providing our tenants with long-term access to our shared infrastructure assets, which we believe is the core driver of value for our stockholders. Tenant additions or modifications of existing tenant equipment (collectively, "tenant additions") enable our tenants to expand coverage and capacity in order to meet increasing demand for data while generating high incremental returns for our business. We believe our product offerings of towers and small cells provide a comprehensive solution to our wireless tenants' growing network needs through our shared communications infrastructure model, which is an efficient and cost-effective way to serve our tenants. Additionally, we believe our ability to share our fiber assets across multiple tenants to deploy both small cells and offer fiber solutions allows us to generate cash flows and increase stockholder return.

•Return cash generated by operating activities to common stockholders in the form of dividends. We believe that distributing a meaningful portion of our cash generated by operating activities appropriately provides common stockholders with increased certainty for a portion of expected long-term stockholder value while still allowing us to retain sufficient flexibility to invest in our business and deliver growth. We believe this decision reflects the translation of the high-quality, long-term contractual cash flows of our business into stable capital returns to common stockholders.

•Invest capital efficiently to grow cash flows and long-term dividends per share. In addition to adding tenants to existing communications infrastructure, we seek to invest our available capital, including the net cash generated by our operating activities and external financing sources, in a manner that will increase long-term stockholder value on a risk-adjusted basis. These investments include constructing and acquiring new communications infrastructure that we expect will generate future cash flow growth and attractive long-term returns by adding tenants to those assets over time. Our historical investments have included the following (in no particular order):

◦construction of towers, fiber and small cells;

◦acquisitions of towers, fiber and small cells;

◦acquisitions of land interests (which primarily relate to land assets under towers);

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◦improvements and structural enhancements to our existing communications infrastructure;

◦purchases of shares of our common stock from time to time; and

◦purchases, repayments or redemptions of our debt.

Our strategy to create long-term stockholder value is based on our belief that there will be considerable future demand for our communications infrastructure based on the location of our assets and the rapid growth in the demand for data. We believe that such demand for our communications infrastructure will continue, will result in growth of our cash flows due to tenant additions on our existing communications infrastructure, and will create other growth opportunities for us, such as demand for newly constructed or acquired communications infrastructure, as described above. Further, we seek to augment the long-term value creation associated with growing our recurring site rental cash flows by offering certain ancillary site development and installation services within our Towers segment.

Highlights of Business Fundamentals and Results

•We operate as a REIT for U.S. federal income tax purposes

◦As a REIT, we are generally entitled to a deduction for dividends that we pay and therefore are not subject to U.S. federal corporate income tax on our taxable income that is distributed to our stockholders.

◦To remain qualified and taxed as a REIT, we will generally be required to annually distribute to our stockholders at least 90% of our REIT taxable income, after the utilization of our NOLs (determined without regard to the dividends paid deduction and excluding net capital gain).

◦See note 6 to our condensed consolidated financial statements for further discussion of our REIT status.

•Potential growth resulting from the increasing demand for data

◦We expect existing and potential new tenant demand for our communications infrastructure will result from (1) new technologies, (2) increased usage of mobile entertainment, mobile internet, and machine-to-machine applications, (3) adoption of other emerging and embedded wireless devices (including smartphones, laptops, tablets, wearables and other devices), (4) increasing smartphone penetration, (5) wireless carrier focus on expanding both network quality and capacity, including the use of both towers and small cells, (6) the adoption of other bandwidth-intensive applications (such as cloud services and video communications), (7) the availability of additional spectrum and (8) increased government initiatives to support connectivity throughout the U.S.

◦We expect U.S. wireless carriers will continue to focus on improving network quality and expanding capacity (including through 5G initiatives) by utilizing a combination of towers and small cells. We believe our product offerings of towers and small cells provide a comprehensive solution to our wireless tenants' growing communications infrastructure needs.

◦We expect organizations will continue to increase the usage of high-bandwidth applications that will require the utilization of more fiber infrastructure and fiber solutions, such as those we provide.

◦Within our Fiber segment, we are able to generate growth and returns for our stockholders by deploying our fiber for both small cells and fiber solutions tenants.

◦Tenant additions on our existing communications infrastructure are achieved at a low incremental operating cost, delivering high incremental returns.

•Substantially all of our communications infrastructure can accommodate additional tenancy, either as currently constructed or with appropriate modifications.

•Investing capital efficiently to grow long-term dividends per share (see also "Item 2. MD&A—General Overview—Strategy")

◦Discretionary capital expenditures of $285 million for the three months ended March 31, 2021, predominately resulting from the construction of new communications infrastructure and improvements to existing communications infrastructure in order to support additional tenants.

◦We expect to continue to construct and acquire new communications infrastructure based on our tenants' needs and generate attractive long-term returns by adding additional tenants over time.

•Site rental revenues under long-term tenant contracts

◦Initial terms of five to 15 years for site rental revenues derived from wireless tenants, with contractual escalations and multiple renewal periods, exercisable at the option of the tenant, of five to 10 years each.

◦Initial terms that generally vary between three to 20 years for site rental revenues derived from our fiber solutions tenants (including from organizations with high-bandwidth and multi-location demands).

◦Weighted-average remaining term of approximately five years, exclusive of renewals exercisable at the tenants' option, currently representing approximately $27 billion of expected future cash inflows.

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•Majority of our revenues from large wireless carriers

◦Approximately 75% of our site rental revenues were derived from T-Mobile, AT&T and Verizon Wireless for the three months ended March 31, 2021.

•Majority of land interests under our towers under long-term control

◦Approximately 90% of our Towers site rental gross margin and approximately 80% of our Towers site rental gross margin is derived from towers located on land that we own or control for greater than 10 and 20 years, respectively. The aforementioned percentages include towers located on land that is owned, including through fee interests and perpetual easements, which represent approximately 40% of our Towers site rental gross margin.

•Majority of our fiber assets are located in major metropolitan areas and are on public rights-of-way.

•Minimal sustaining capital expenditure requirements

◦Sustaining capital expenditures represented approximately 1% of net revenues.

•Debt portfolio with long-dated maturities extended over multiple years, with the vast majority of such debt having a fixed rate (see note 4 to our condensed consolidated financial statements and "Item 3. Quantitative and Qualitative Disclosures About Market Risk" for a further discussion of our debt)

◦As of March 31, 2021, our outstanding debt has a weighted-average interest rate of 3.1% and weighted-average maturity of approximately nine years (assuming anticipated repayment dates on our Tower Revenue Notes).

◦91% of our debt has fixed rate coupons.

◦Our debt service coverage and leverage ratios are within their respective financial maintenance covenants.

•During 2021, we have completed the following financing activities (see notes 4 and 9 to our condensed consolidated financial statements)

◦In February 2021, we issued $3.25 billion aggregate principal amount of senior unsecured notes ("February 2021 Senior Notes"), which consisted of (1) $1.0 billion aggregate principal amount of 1.050% senior unsecured notes due July 2026, (2) $1.0 billion aggregate principal amount of 2.100% senior unsecured notes due April 2031 and (3) $1.25 billion aggregate principal amount of 2.900% senior unsecured notes due April 2041. We used the net proceeds from the February 2021 Senior Notes offering to (1) redeem all of the outstanding 5.250% Senior Notes, (2) repay the outstanding Commercial Paper Notes and (3) repay a portion of outstanding borrowings under the 2016 Term Loan A.

◦In March 2021, we terminated the previously outstanding 2018 ATM Program and established the 2021 ATM Program through which we may issue and sell shares of our common stock having an aggregate gross sales price of up to $750 million.

•Significant cash flows from operations

◦Net cash provided by operating activities was $584 million for the three months ended March 31, 2021.

◦In addition to the positive impact of contractual escalators, we expect to grow our core business of providing access to our communications infrastructure as a result of future anticipated additional demand for our communications infrastructure.

•Returning cash flows provided by operations to stockholders in the form of dividends

◦During the first quarter of 2021, we paid a common stock dividend of $1.33 per share, totaling approximately $588 million.

◦We currently expect our common stock dividends over the next 12 months to be a cumulative amount of at least $5.32 per share, or an aggregate amount of approximately $2.3 billion.

◦Over time, we expect to increase our dividend per share generally commensurate with our growth in cash flows. Any future common stock dividends are subject to declaration by our board of directors. See note 9 to our condensed consolidated financial statements for further information regarding our common stock and dividends.

Outlook Highlights

The following are certain highlights of our full year 2021 outlook that impact our business fundamentals described above.

•We expect that, when compared to full year 2020, our full year 2021 site rental revenue will be positively impacted by tenant additions, as large wireless carriers and fiber solutions tenants continue to focus on meeting the increasing demand for data.

•We expect to continue to invest a meaningful amount of our available capital in the form of discretionary capital expenditures for 2021 based on the anticipated returns on such discretionary investments. We expect that our discretionary capital expenditures in 2021 will decrease when compared to 2020 as a result of both (1) the completion of certain fiber expansion projects in 2020 and (2) an expected higher proportion of small cell capital expenditures associated with less capital-intensive tenant additions.

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•We also expect sustaining capital expenditures to remain approximately 2% of net revenues for full year 2021, consistent with historical annual levels.

Coronavirus (COVID-19)

In accordance with the U.S. Department of Homeland Security guidance issued in March 2020 designating telecommunications infrastructure and networks as critical infrastructure, we have continued our operations to ensure the viability of communications networks, which are essential to public health and safety. To date, we have taken a variety of measures to ensure the availability of our critical infrastructure, promote the health and safety of our employees, and support the communities in which we operate. These measures include requiring work-from-home arrangements for a large portion of our workforce, imposing travel restrictions for our employees where practicable, canceling physical participation in meetings, events and conferences, forming an internal committee to monitor and implement procedures for the return of our workforce to an office setting, and other modifications to our business practices. We will continue to actively monitor the situation and may take further actions as may be required by governmental authorities or that we determine are in the best interests of our employees, tenants, business partners and stockholders.

We do not believe that COVID-19 had a material impact on our financial position, results of operations and cash flows during the three months ended March 31, 2021. Given the Company’s access to various sources of liquidity and no near term debt maturities other than Commercial Paper Notes and principal payments on amortizing debt, we currently anticipate that we will be able to maintain sufficient liquidity as we manage through the current environment. See also "Item 2. MD&A—Liquidity and Capital Resources—Liquidity Position."

Results of Operations

The following discussion of our results of operations should be read in conjunction with our condensed consolidated financial statements and the 2020 Form 10-K.

The following discussion of our results of operations is based on our condensed consolidated financial statements prepared in accordance with GAAP, which requires us to make estimates and judgments that affect the reported amounts (see "Item 2. MD&A—Accounting and Reporting Matters—Critical Accounting Policies and Estimates" and note 2 to our consolidated financial statements in the 2020 Form 10-K). See "Item 2. MD&A—Accounting and Reporting Matters—Non-GAAP and Segment Financial Measures" for a discussion of our use of (1) segment site rental gross margin, (2) segment services and other gross margin, (3) segment operating profit, including their respective definitions, and (4) Adjusted EBITDA, including its definition, and a reconciliation to net income.

Our operating segments consist of (1) Towers and (2) Fiber. See note 10 to our condensed consolidated financial statements for further discussion of our operating segments.

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Highlights of our results of operations for the three months ended March 31, 2021 and 2020 are depicted below.

(In millions of dollars)	Three Months Ended March 31,
	2021	2020	$ Change	% Change
Site rental revenues:
Towers site rental revenues	$895	$867	+$28	+3%
Fiber site rental revenues	$474	$443	+$31	+7%
Total site rental revenues	$1,369	$1,310	+$59	+5%
Segment site rental gross margin:
Towers site rental gross margin(a)	$683	$653	+$30	+5%
Fiber site rental gross margin(a)	$313	$291	+$22	+8%
Services and other gross margin:
Towers services and other gross margin(a)	$35	$13	+$22	+169%
Fiber services and other gross margin(a)	$2	$1	+$1	+100%
Segment operating profit:
Towers operating profit(a)	$693	$642	+$51	+8%
Fiber operating profit(a)	$270	$241	+$29	+12%
Income from continuing operations	$121	$185	$(64)	(35)%
Net income attributable to CCIC stockholders	$58	$185	$(127)	(69)%
Adjusted EBITDA(b)	$897	$814	+$83	+10%

(a)See note 10 to our condensed consolidated financial statements and "Item 2. MD&A—Accounting and Reporting Matters—Non-GAAP and Segment Financial Measures" for further discussion of our definitions of segment site rental gross margin, segment services and other gross margin and segment operating profit.

(b)See reconciliation of this non-GAAP financial measure to net income (loss) and definition included in "Item 2. MD&A—Accounting and Reporting Matters—Non-GAAP and Segment Financial Measures."

Site rental revenues grew $59 million, or 5%, for the three months ended March 31, 2021 compared to the three months ended March 31, 2020. This growth was predominately comprised of the factors depicted in the chart below:

(In millions of dollars)

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(a)Includes amortization of up-front payments received from long-term tenant contracts and other deferred credits (commonly referred to as prepaid rent).

(b)Represents the contribution from recent acquisitions until the one-year anniversary of the acquisition.

Towers site rental revenues for the first quarter of 2021 were $895 million and increased by $28 million, or 3%, from $867 million during the same period in the prior year. The increase in Towers site rental revenues was impacted by the following items, inclusive of straight-line accounting: tenant additions across our entire portfolio, renewals or extensions of tenant contracts, escalations and non-renewals of tenants contracts. Tenant additions were influenced by our tenants' ongoing efforts to improve network quality and capacity.

Fiber site rental revenues for the first quarter of 2021 were $474 million and increased by $31 million, or 7%, from $443 million during the same period in the prior year. The increase in Fiber site rental revenues was predominately impacted by the increased demand for small cells and fiber solutions. Increased demand for small cells was driven by our tenants' network strategy in an effort to provide capacity and relieve network congestion, and increased demand for fiber solutions was driven by increasing demand for data.

The increase in Towers site rental gross margin from the first quarter of 2020 to the first quarter of 2021 was related to the previously-mentioned 3% increase in Towers site rental revenues and relatively fixed costs to operate our towers. The increase in Fiber site rental gross margin was predominately related to the previously-mentioned 7% increase in Fiber site rental revenues.

Towers services and other gross margin was $35 million for the first quarter of 2021 and increased by $22 million from $13 million during the same period in the prior year, which is a reflection of the volume of activity from carriers' network enhancements and the volume and mix of services and other work. Our services and other offerings are of a variable nature as these revenues are not under long-term contracts.

Selling, general and administrative expenses for the first quarter of 2021were $164 million and decreased by $11 million, or 6%, from $175 million during the same period in the prior year. The decrease in selling, general and administrative expenses was primarily due to, among other factors, our fourth quarter 2020 reduction in force (as discussed in our 2020 Form 10-K).

Towers operating profit for the first quarter of 2021 increased by $51 million, or 8%, from the same period in the prior year. The increase in Towers operating profit was primarily related to the growth in our Towers site rental revenues and relatively fixed costs to operate our towers as well as the previously-mentioned increase in Towers services and other gross margin.

Fiber operating profit for the first quarter of 2021 increased by $29 million, or 12%, from the same period in the prior year. The increase in Fiber operating profit was primarily related to the the previously-mentioned growth in our Fiber site rental revenues.

Interest expense and amortization of deferred financing costs were $170 million for the first quarter of 2021 and decreased by $5 million, or 3%, from $175 million during the same period in the prior year. The decrease predominately resulted from a reduction in the variable interest rate on our 2016 Term Loan A and 2016 Revolver due to a lower LIBOR, partially offset by the impact of a corresponding increase in our outstanding indebtedness due to the financing of our discretionary capital expenditures. See note 4 to our condensed consolidated financial statements and "Item 3. Quantitative and Qualitative Disclosures About Market Risk" for a further discussion of our debt.

As a result of repaying certain of our indebtedness in conjunction with our refinancing activities, we incurred losses on retirement of long-term obligations of $143 million during the first quarter of 2021. See note 4 to our condensed consolidated financial statements.

For the first quarter of 2021 and 2020, the effective tax rate differs from the federal statutory rate predominately due to our REIT status, including the dividends paid deduction.  See note 6 to our condensed consolidated financial statements and also note 9 to our consolidated financial statements in the 2020 Form 10-K.

Income from continuing operations was $121 million during the first quarter of 2021 compared to $185 million during the first quarter of 2020. The decrease was predominately due to the previously-mentioned losses on retirement of long-term obligations, which was partially offset by growth in our site rental activities in both our Towers and Fiber segments as well as the previously-mentioned increase in Towers services activity.

Loss from discontinued operations, net of tax, was $63 million during the first quarter of 2021 due to the ATO Settlement. See notes 6 and 12 to our condensed consolidated financial statements.

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Net income attributable to CCIC stockholders was $58 million during the first quarter of 2021 compared to $185 million during the first quarter of 2020. The decrease was due to the previously-mentioned decrease in income from continuing operations and loss from discontinued operations, net of tax.

Adjusted EBITDA increased $83 million, or 10%, from the first quarter of 2020 to the first quarter of 2021, reflecting the growth in our site rental activities in both our Towers and Fiber segments as well as the previously-mentioned increase in Towers services activity.

Liquidity and Capital Resources

Overview

General. Our core business generates revenues under long-term tenant contracts (see "Item 2. MD&A—General Overview—Overview") from (1) the largest U.S. wireless carriers and (2) fiber solutions tenants. As a leading provider of shared communications infrastructure in the U.S., our strategy is to create long-term stockholder value via a combination of (1) growing cash flows generated from our portfolio of communications infrastructure, (2) returning a meaningful portion of our cash generated by operating activities to our stockholders in the form of dividends, and (3) investing capital efficiently to grow cash flows and long-term dividends per share. Our strategy is based, in part, on our belief that the U.S. is the most attractive market for shared communications infrastructure investment with the greatest long-term growth potential. We measure our efforts to create "long-term stockholder value" by the combined payment of dividends to stockholders and growth in our per share results.

We have engaged, and expect to continue to engage, in discretionary investments that we believe will maximize long-term stockholder value. Our historical discretionary investments include (in no particular order): constructing communications infrastructure, acquiring communications infrastructure, acquiring land interests (which primarily relate to land assets under towers), improving and structurally enhancing our existing communications infrastructure, purchasing shares of our common stock, and purchasing, repaying, or redeeming our debt. We have recently spent, and expect to continue to spend, a significant percentage of our discretionary investments on the construction of small cells and fiber. We seek to fund our discretionary investments with both net cash generated by operating activities and cash available from financing capacity, such as the use of our undrawn availability from the 2016 Revolver, issuances under our CP Program, debt financings and issuances of equity or equity-related securities, including under our 2021 ATM Program.

We seek to maintain a capital structure that we believe drives long-term stockholder value and optimizes our weighted-average cost of capital. We target a leverage ratio of approximately five times Adjusted EBITDA and interest coverage of Adjusted EBITDA to interest expense of approximately three times, subject to various factors, such as the availability and cost of capital and the potential long-term return on our discretionary investments. We may choose to increase or decrease our leverage or coverage from these targets for various periods of time. We have no significant contractual debt maturities until 2023 (other than Commercial Paper Notes that may be outstanding from time to time and principal payments on certain outstanding debt).

We operate as a REIT for U.S. federal income tax purposes. We expect to continue to pay minimal cash income taxes as a result of our REIT status and our NOLs. See note 6 to our condensed consolidated financial statements and also our 2020 Form 10-K.

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Liquidity Position. The following is a summary of our capitalization and liquidity position as of March 31, 2021. See "Item 3. Quantitative and Qualitative Disclosures About Market Risk" and note 4 to our condensed consolidated financial statements for additional information regarding our debt, as well as note 9 to our condensed consolidated financial statements for additional information regarding our 2021 ATM Program.

(In millions of dollars)
Cash, cash equivalents, and restricted cash(a)	$	438
Undrawn 2016 Revolver availability(b)	4,387
Debt and other long-term obligations (current and non-current)(c)	19,872
Total equity	8,923

(a)Inclusive of $5 million included within "Other assets, net" on our condensed consolidated balance sheet.

(b)Availability at any point in time is subject to certain restrictions based on the maintenance of financial covenants contained in the 2016 Credit Facility. See the 2020 Form 10-K. At any point in time, we intend to maintain available commitments under our 2016 Revolver in an amount at least equal to the amount of outstanding Commercial Paper Notes.

(c)See "Item 2. MD&A—General Overview—Overview" and note 4 to our condensed consolidated financial statements for further information regarding the CP Program.

Over the next 12 months:

•Our liquidity sources may include (1) cash on hand, (2) net cash generated by our operating activities, (3) undrawn availability under our 2016 Revolver, (4) issuances under our CP Program, and (5) issuances of equity pursuant to our 2021 ATM Program. Our liquidity uses over the next 12 months are expected to include (1) debt service obligations of $159 million (principal payments), (2) cumulative common stock dividend payments expected to be at least $5.32 per share, or an aggregate amount of approximately $2.3 billion (see "Item 2. MD&A—Business Fundamentals and Results") and (3) capital expenditures. Additionally, amounts available under the CP Program may be repaid and re-issued from time to time. During the next 12 months, while our liquidity uses are expected to exceed our net cash provided by operating activities, we expect that our liquidity sources described above should be sufficient to cover our expected uses. Historically, from time to time, we have accessed the capital markets to issue debt and equity.

•See "Item 3. Quantitative and Qualitative Disclosures About Market Risk" for a tabular presentation of our debt maturities and a discussion of anticipated repayment dates.

Summary Cash Flow Information

	Three Months Ended March 31,
(In millions of dollars)	2021		2020		Change
Net increase (decrease) in cash, cash equivalents, and restricted cash:
Operating activities	$	584	$	653	$	(69)
Investing activities	(311)		(468)		157
Financing activities	(217)		(50)		(167)
Net increase (decrease) in cash, cash equivalents, and restricted cash	56		135		(79)
Effect of exchange rate changes on cash	1		(1)		2
Net increase (decrease) in cash, cash equivalents, and restricted cash	$	57	$	134	$	(77)

Operating Activities

Net cash provided by operating activities of $584 million for the first three months of 2021 decreased by $69 million, or 11%, compared to the first three months of 2020, due primarily to the growth in our core business, which was fully offset by a net decrease from changes in working capital. Changes in working capital contribute to variability in net cash provided by operating activities, largely due to the timing of advanced payments by us and advanced receipts from tenants. We expect to grow our net cash provided by operating activities in the future (exclusive of changes in working capital) if we realize expected growth in our core business.

Investing Activities

Net cash used for investing activities of $311 million for the first three months of 2021 decreased by $157 million, or 34%, from the first three months of 2020 primarily as a result of decreased discretionary capital expenditures in both our Towers and Fiber segment.

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Capital Expenditures

Our capital expenditures are categorized as discretionary, integration or sustaining as described below.

•Discretionary capital expenditures are made with respect to activities which we believe exhibit sufficient potential to enhance long-term stockholder value. They primarily consist of expansion or development of communications infrastructure (including capital expenditures related to (1) enhancing communications infrastructure in order to add new tenants for the first time or support subsequent tenant equipment augmentations or (2) modifying the structure of a communications infrastructure asset to accommodate additional tenants) and construction of new communications infrastructure. Discretionary capital expenditures also include purchases of land interests (which primarily relate to land assets under towers as we seek to manage our interests in the land beneath our towers), certain technology-related investments necessary to support and scale future customer demand for our communications infrastructure, and other capital projects. The expansion or development of existing communications infrastructure to accommodate new leasing typically varies based on, among other factors: (1) the type of communications infrastructure, (2) the scope, volume, and mix of work performed on the communications infrastructure, (3) existing capacity prior to installation, or (4) changes in structural engineering regulations and standards. Currently, construction of new communications infrastructure is predominately comprised of the construction of small cells and fiber (including certain construction projects that may take 18 to 36 months to complete). Our decisions regarding discretionary capital expenditures are influenced by the availability and cost of capital and expected returns on alternative uses of cash, such as payments of dividends and investments.

•Sustaining capital expenditures consist of those capital expenditures not otherwise categorized as discretionary capital expenditures, such as (1) maintenance capital expenditures on our communications infrastructure assets that enable our tenants' ongoing quiet enjoyment of the communications infrastructure and (2) ordinary corporate capital expenditures.

Capital expenditures for the three months ended March 31, 2021 and 2020 were as follows:

	For the Three Months Ended
(In millions of dollars)	March 31, 2021								March 31, 2020
	Towers		Fiber		Other		Total		Towers		Fiber		Other		Total
Discretionary:
Purchases of land interests	$	14	$	—	$	—	$	14	$	13	$	—	$	—	$	13
Communications infrastructure improvements and other capital projects(a)	35		225		11		271		87		319		7		413
Sustaining	2		12		3		17		5		9		7		21
Total	$	51	$	237	$	14	$	302	$	105	$	328	$	14	$	447

(a)Towers segment includes $18 million and $42 million of capital expenditures incurred during the three months ended March 31, 2021 and 2020, respectively, in connection with tenant installations and upgrades on our towers.

Discretionary capital expenditures were primarily impacted by the completion of certain large fiber expansion projects during 2020 as well as the timing of Towers tenant activity during the first three months of 2021 compared to the same period in 2020. See also "Item 2. MD&A—General Overview—Outlook Highlights" for our expectations surrounding 2021 capital expenditures.

Financing Activities. We seek to allocate cash generated by our operations in a manner that will enhance long-term stockholder value, which may include various financing activities such as (in no particular order): (1) paying dividends on our common stock (currently expected to total at least $5.32 per share over the next 12 months, or an aggregate amount of approximately $2.3 billion); (2) purchasing our common stock; or (3) purchasing, repaying, or redeeming our debt. See notes 4 and 9 to our condensed consolidated financial statements.

Net cash used for financing activities of $217 million for the first three months of 2021 increased by $167 million from the first three months of 2020 as a result of the net impact from our issuances, purchases and repayments of debt (including with respect to our 2016 Credit Facility and CP Program), common and preferred stock dividend payments and purchases of common stock. See Item 2. MD&A—General Overview—Business Fundamentals and Results and notes 4 and 9 to our condensed consolidated financial statements for further information.

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In February 2021, we issued $3.25 billion aggregate principal amount of senior unsecured notes, the net proceeds of which were used to (1) redeem all of the outstanding 5.250% Senior Notes, (2) repay a portion of the outstanding Commercial Paper Notes and (3) repay a portion of outstanding borrowings under the 2016 Term Loan A. See note 4 to our condensed consolidated financial statements.

Credit Facility. The proceeds of our 2016 Revolver may be used for general corporate purposes, which may include the financing of capital expenditures, acquisitions and purchases of our common stock. As of April 29, 2021, there were no amounts outstanding and $5.0 billion in undrawn availability under our 2016 Revolver. See note 4 to our condensed consolidated financial statements.

Commercial Paper Program. See "Item 2. MD&A—General Overview—Overview" and note 4 to our condensed consolidated financial statements for further information regarding our CP Program. As of April 29, 2021, there was $408 million outstanding under our CP Program.

Incurrence, Purchases, and Repayments of Debt. See "Item 2. MD&A—General Overview—Highlights of Business Fundamentals and Results" for further discussion of our recent issuances, purchases, redemption and repayments of debt.

Common Stock Activity. See note 9 to our condensed consolidated financial statements for further information regarding our common stock and dividends.

ATM Program. We previously maintained a 2018 ATM Program through which we had the right to issue and sell shares of our common stock having an aggregate gross sales price of up to $750 million to or through sales agents. In March 2021, we terminated the formerly outstanding 2018 ATM Program.

In March 2021, we established the 2021 ATM Program through which we may issue and sell shares of our common stock having an aggregate gross sales price of up to $750 million. Sales under the 2021 ATM Program may be made by means of ordinary brokers' transactions on the NYSE or otherwise at market prices prevailing at the time of sale, at prices related to prevailing market prices or, subject to our specific instructions, at negotiated prices. We intend to use the net proceeds from any sales under the 2021 ATM Program for general corporate purposes, which may include (1) the funding of future acquisitions or investments or (2) the repayment or repurchase of any outstanding indebtedness. We have not sold any shares of common stock under the 2021 ATM Program. See note 9 to our condensed consolidated financial statements for further information regarding our 2021 ATM Program.

Debt Covenants. Our Credit Agreement contains financial maintenance covenants. We are currently in compliance with these financial maintenance covenants and, based upon our current expectations, we believe we will continue to comply with our financial maintenance covenants. In addition, certain of our debt agreements contain restrictive covenants that place restrictions on us and may limit our ability to, among other things, incur additional debt and liens, purchase our securities, make capital expenditures, dispose of assets, undertake transactions with affiliates, make other investments, pay dividends or distribute excess cash flow. See the 2020 Form 10-K for a further discussion of our debt covenants, certain restrictive covenants and factors that are likely to determine our subsidiaries' ability to comply with current and future debt covenants.

Accounting and Reporting Matters

Critical Accounting Policies and Estimates

Our critical accounting policies and estimates are those that we believe (1) are most important to the portrayal of our financial condition and results of operations or (2) require our most difficult, subjective or complex judgments, often as a result of the need to make estimates about the effect of matters that are inherently uncertain. In many cases, the accounting treatment of a particular transaction is specifically prescribed by GAAP. In other cases, management is required to exercise judgment in the application of accounting principles with respect to particular transactions. The critical accounting policies and estimates for 2021 are not intended to be a comprehensive list of our accounting policies and estimates. Our critical accounting policies and estimates as of December 31, 2020 are described in "Item 7. MD&A—Accounting and Reporting Matters" and in note 2 of our consolidated financial statements in the 2020 Form 10-K.

Accounting Pronouncements

Recently Adopted Accounting Pronouncements.

See note 2 to our condensed consolidated financial statements.

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Recent Accounting Pronouncements Not Yet Adopted.

See note 2 to our condensed consolidated financial statements.

Non-GAAP and Segment Financial Measures

We use earnings before interest, taxes, depreciation, amortization and accretion, as adjusted ("Adjusted EBITDA"), which is a non-GAAP financial measure, as an indicator of consolidated financial performance. Our measure of Adjusted EBITDA may not be comparable to similarly titled measures of other companies, including companies in the communications infrastructure sector or other REITs, and is not a measure of performance calculated in accordance with GAAP. Adjusted EBITDA should not be considered in isolation or as a substitute for operating income (loss), net income (loss), net cash provided by (used for) operating, investing and financing activities or other income statement or cash flow statement data prepared in accordance with GAAP and should be considered only as a supplement to income (loss) from continuing operations computed in accordance with GAAP as a measure of our performance. There are material limitations to using a measure such as Adjusted EBITDA, including the difficulty associated with comparing results among more than one company, including our competitors, and the inability to analyze certain significant items, including depreciation and interest expense, that directly affect our net income or loss. Management compensates for these limitations by considering the economic effect of the excluded expense items independently as well as in connection with their analysis of income (loss) from continuing operations.

We define Adjusted EBITDA as income (loss) from continuing operations plus restructuring charges (credits), asset write-down charges, acquisition and integration costs, depreciation, amortization and accretion, amortization of prepaid lease purchase price adjustments, interest expense and amortization of deferred financing costs, (gains) losses on retirement of long-term obligations, net (gain) loss on interest rate swaps, (gains) losses on foreign currency swaps, impairment of available-for-sale securities, interest income, other (income) expense, (benefit) provision for income taxes, cumulative effect of a change in accounting principle and stock-based compensation expense. The reconciliation of Adjusted EBITDA to our net income (loss) is set forth below.

(In millions of dollars)	Three Months Ended March 31,
	2021		2020(b)
Income (loss) from continuing operations	$	121	$	185
Adjustments to increase (decrease) income (loss) from continuing operations:
Asset write-down charges	3		4
Acquisition and integration costs	—		5
Depreciation, amortization and accretion	408		399
Amortization of prepaid lease purchase price adjustments	5		5
Interest expense and amortization of deferred financing costs	170		175
(Gains) losses on retirement of long-term obligations	143		—
Interest income	(1)		(1)
Other (income) expense	8		—
(Benefit) provision for income taxes	7		5
Stock-based compensation expense	33		36
Adjusted EBITDA(a)	$	897	$	814

(a)The above reconciliation excludes the items included in our Adjusted EBITDA definition which are not applicable to the periods shown.

(b)The components in this column do not sum to the total due to rounding.

We believe Adjusted EBITDA is useful to investors or other interested parties in evaluating our financial performance because:

•it is the primary measure used by our management (1) to evaluate the economic productivity of our operations and (2) for purposes of making decisions about allocating resources to, and assessing the performance of, our operations;

•although specific definitions may vary, it is widely used by investors or other interested parties in evaluation of the communications infrastructure sector and other REITs to measure financial performance without regard to items such as depreciation, amortization and accretion, which can vary depending upon accounting methods and the book value of assets;

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•we believe it helps investors and other interested parties meaningfully evaluate and compare the results of our operations (1) from period to period and (2) to our competitors by removing the impact of our capital structure (primarily interest charges from our outstanding debt) and asset base (primarily depreciation, amortization and accretion) from our financial results; and

•it is similar to the measure of current financial performance generally used in our debt covenant calculations.

Our management uses Adjusted EBITDA:

•as a performance goal in employee annual incentive compensation;

•as a measurement of financial performance because it assists us in comparing our financial performance on a consistent basis as it removes the impact of our capital structure (primarily interest charges from our outstanding debt) and asset base (primarily depreciation, amortization and accretion) from our operating results;

•in presentations to our board of directors to enable it to have the same measurement of financial performance used by management;

•for planning purposes, including preparation of our annual operating budget;

•as a valuation measure in strategic analyses in connection with the purchase and sale of assets;

•in determining self-imposed limits on our debt levels, including the evaluation of our leverage ratio and interest coverage ratio; and

•with respect to compliance with our debt covenants, which require us to maintain certain financial ratios that incorporate concepts such as, or similar to, Adjusted EBITDA.

In addition to the non-GAAP measures used herein and as discussed in note 10 to our condensed consolidated financial statements, we also provide (1) segment site rental gross margin, (2) segment services and other gross margin, and (3) segment operating profit, which are key measures used by management to evaluate the performance of our operating segments. These segment measures are provided pursuant to GAAP requirements related to segment reporting.

We define segment site rental gross margin as segment site rental revenues less segment site rental cost of operations, which excludes stock-based compensation expense and prepaid lease purchase price adjustments recorded in consolidated site rental cost of operations. We define segment services and other gross margin as segment services and other revenues less segment services and other cost of operations, which excludes stock-based compensation expense recorded in consolidated services and other cost of operations. We define segment operating profit as segment site rental gross margin plus segment services and other gross margin, and segment other operating (income) expense, less selling, general and administrative expenses attributable to the respective segment. All of these measurements of profit or loss are exclusive of depreciation, amortization and accretion, which are shown separately. Additionally, certain costs are shared across segments and are reflected in our segment measures through allocations that management believes to be reasonable.

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ITEM 3.QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

The following section updates "Item 7A. Quantitative and Qualitative Disclosures About Market Risk" in the 2020 Form 10-K and should be read in conjunction with that report as well as our condensed consolidated financial statements included in Part 1, Item 1 of this Form 10-Q.

Interest Rate Risk

Our interest rate risk as of March 31, 2021 relates primarily to the impact of interest rate movements on the following:

•the potential refinancing of our existing debt ($20.0 billion outstanding at March 31, 2021 and $19.4 billion at December 31, 2020);

•our $1.9 billion and $2.8 billion of floating rate debt at March 31, 2021 and December 31, 2020, respectively, which represented approximately 9% and 15% of our total debt, as of March 31, 2021 and December 31, 2020, respectively; and

•potential future borrowings of incremental debt, including borrowings under our 2016 Credit Facility and issuances under the CP Program.

We currently have no interest rate swaps.

Sensitivity Analysis

We manage our exposure to market interest rates on our existing debt by controlling the mix of fixed and floating rate debt. As of March 31, 2021, we had $1.9 billion of floating rate debt, none of which had LIBOR floors. As a result, a hypothetical unfavorable fluctuation in market interest rates on our existing debt of 1/8 of a percent point over a 12 month period would increase our interest expense by approximately $2 million.

Tabular Information

The following table provides information about our market risk related to changes in interest rates. The future principal payments and weighted-average interest rates are presented as of March 31, 2021. These debt maturities reflect final maturity dates and do not consider the impact of the principal payments that commence following the anticipated repayment dates of certain debt (see footnotes (b) and (d)). The information presented below regarding the variable rate debt is supplementary to our sensitivity analysis regarding the impact of changes in the interest rates. See notes 4 and 5 to our condensed consolidated financial statements and the 2020 Form 10-K for additional information regarding our debt.

	Future Principal Payments and Interest Rates by the Debt Instruments' Contractual Year of Maturity
(In millions of dollars)	2021			2022			2023			2024			2025			Thereafter			Total			Fair Value(a)
Debt:
Fixed rate(b)	$	33		$	38		$	1,783		$	778		$	525		$	15,032		$	18,189		$	18,859
Average interest rate(b)(c)(d)	4.3		%	4.4		%	3.6		%	3.3		%	1.5		%	4.0		%	3.9		%
Variable rate(e)	$	128		$	117		$	205		$	1,409		$	—		$	—		$	1,859		$	1,859
Average interest rate(e)	1.0		%	1.4		%	1.8		%	2.4		%	—		%	—		%	2.2		%

(a)The fair value of our debt is based on indicative quotes (that is, non-binding quotes) from brokers that require judgment to interpret market information, including implied credit spreads for similar borrowings on recent trades or bid/ask offers. These fair values are not necessarily indicative of the amount which could be realized in a current market exchange.

(b)The impact of principal payments that will commence following the anticipated repayment dates is not considered. The Tower Revenue Notes have principal amounts of $300 million, $250 million, $700 million and $750 million, with anticipated repayment dates in 2022, 2023, 2025 and 2028, respectively.

(c)The average interest rate represents the weighted-average stated coupon rate (see footnote (d)).

(d)If the Tower Revenue Notes are not repaid in full by the applicable anticipated repayment dates, the applicable interest rate increases by approximately 5% per annum and monthly principal payments commence using the Excess Cash Flow (as defined in the indenture governing the applicable Tower Revenue Notes) of the issuers of the Tower Revenue Notes. The Tower Revenue Notes are presented based on their contractual maturity dates ranging from 2042 to 2048 and include the impact of an assumed 5% increase in interest rate that would occur following the anticipated repayment dates but exclude the impact of monthly principal payments that would commence using Excess Cash Flow of the issuers of the Tower Revenue Notes. The full year 2020 Excess Cash Flow of the issuers of the Tower Revenue Notes was approximately $815 million. We currently expect to refinance these notes on or prior to the respective anticipated repayment dates.

(e)Predominately relates to our 2016 Term Loan A and 2016 Revolver borrowings, each of which matures in 2024.

30

ITEM 4.CONTROLS AND PROCEDURES

Disclosure Controls and Procedures

The Company conducted an evaluation, under the supervision and with the participation of the Company's management, including the Company's Chief Executive Officer ("CEO") and Chief Financial Officer ("CFO"), of the effectiveness of the Company's disclosure controls and procedures as of the end of the period covered by this report. Based upon their evaluation, the CEO and CFO concluded that as of March 31, 2021, the Company's disclosure controls and procedures were effective in alerting them in a timely manner to material information relating to the Company required to be included in the Company's periodic reports under the Securities Exchange Act of 1934, as amended.

Changes in Internal Control Over Financial Reporting

There have been no changes in the Company's internal control over financial reporting during the fiscal quarter covered by this Form 10-Q that have materially affected, or are reasonably likely to materially affect, the Company's internal control over financial reporting.

PART II—OTHER INFORMATION

ITEM 1.    LEGAL PROCEEDINGS

See the disclosure in note 8 to our condensed consolidated financial statements set forth in Part I, Item 1 of this Form 10-Q.

ITEM 1A.RISK FACTORS

There are no material changes to the risk factors discussed in "Item 1A. Risk Factors" in our 2020 Form 10-K.

ITEM 2.    UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS

The following table summarizes information with respect to purchase of our equity securities during the first quarter of 2021:

Period	Total Number of Shares Purchased	Average Price Paid per Share		Total Number of Shares Purchased as Part of Publicly Announced Plans or Programs	Maximum Number (or Approximate Dollar Value) of Shares that May Yet Be Purchased Under the Plans or Programs
	(In thousands)
January 1 - January 31, 2021	—	$	—	—	—
February 1 - February 28, 2021	407	164.90		—	—
March 1 - March 31, 2021	2	151.04		—	—
Total	409	$	164.84	—	—

We paid $67 million in cash to effect these purchases. The shares purchased relate to shares withheld in connection with the payment of withholding taxes upon vesting of restricted stock units.

31

ITEM 6.EXHIBITS

Exhibit Index

		Incorporated by Reference
Exhibit Number	Exhibit Description	Form	File Number	Date of Filing	Exhibit Number
3.1	Restated Certificate of Incorporation of Crown Castle International Corp., dated July 20, 2017	8-K	001-16441	July 26, 2017	3.1
3.2	Amended and Restated By-Laws of Crown Castle International Corp. dated February 21, 2019	10-K	001-16441	February 25, 2019	3.3
4.1	Fifth Supplemental Indenture dated February 16, 2021, between Crown Castle International Corp. and The Bank of New York Mellon Trust Company, N.A., as trustee, to the Indenture dated February 11, 2019, between Crown Castle International Corp. and The Bank of New York Mellon Trust Company, N.A., as trustee	8-K	001-16441	February 16, 2021	4.1
10.1	Crown Castle International Corp. 2021 Executive Management Team Annual Incentive Plan	8-K	001-16441	February 18, 2021	10.1
31.1*	Certification of Chief Executive Officer pursuant to Section 302 of Sarbanes-Oxley Act of 2002	—	—	—	—
31.2*	Certification of Chief Financial Officer pursuant to Section 302 of Sarbanes-Oxley Act of 2002	—	—	—	—
32.1†	Certification of Chief Executive Officer and Chief Financial Officer pursuant to Section 906 of Sarbanes-Oxley Act of 2002	—	—	—	—
101*	The following financial statements from Crown Castle International Corp.'s Quarterly Report on Form 10-Q for the quarter ended March 31, 2021, formatted in Inline XBRL: (i) Condensed Consolidated Balance Sheet, (ii) Condensed Consolidated Statement of Operations and Comprehensive Income (Loss), (iii) Condensed Consolidated Statement of Cash Flows, (iv) Condensed Consolidated Statement of Equity, and (v) Notes to Condensed Consolidated Financial Statements, tagged as blocks of text and including detailed tags	—	—	—	—
104*	The cover page from Crown Castle International Corp.'s Quarterly Report on Form 10-Q for the quarter ended March 31, 2021, formatted in Inline XBRL	—	—	—	—

* Filed herewith.

† Furnished herewith.

32

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

		CROWN CASTLE INTERNATIONAL CORP.
Date:	May 3, 2021	By:	/s/ DANIEL K. SCHLANGER
			Daniel K. Schlanger
			Executive Vice President and Chief Financial Officer
			(Principal Financial Officer)
Date:	May 3, 2021	By:	/s/  ROBERT S. COLLINS
			Robert S. Collins
			Vice President and Controller
			(Principal Accounting Officer)

33

EX-31.1

Exhibit 31.1

Certification

For the Quarterly Period Ended March 31, 2021

I, Jay A. Brown, certify that:

1.I have reviewed this report on Form 10-Q of Crown Castle International Corp. ("registrant");

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 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 and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

a)All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

b)Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

Date:  May 3, 2021

/s/ Jay A. Brown

Jay A. Brown
President and Chief Executive Officer

EX-31.2

Exhibit 31.2

Certification

For the Quarterly Period Ended March 31, 2021

I, Daniel K. Schlanger, certify that:

1.I have reviewed this report on Form 10-Q of Crown Castle International Corp. ("registrant");

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 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 and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

a)All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

b)Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

Date:  May 3, 2021

/s/ Daniel K. Schlanger

Daniel K. Schlanger
Executive Vice President and Chief Financial Officer

EX-32.1

Exhibit 32.1

Certification Pursuant to

18 U.S.C. Section 1350

As Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

In connection with the Quarterly Report on Form 10-Q of Crown Castle International Corp., a Delaware Corporation ("Company"), for the period ended March 31, 2021 as filed with the Securities and Exchange Commission on the date hereof ("Report"), each of the undersigned officers of the Company hereby certifies 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 such officer's knowledge:

1)the Report 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 as of March 31, 2021 (the last date of the period covered by the Report).

/s/ Jay A. Brown

Jay A. Brown
President and Chief Executive Officer

May 3, 2021

/s/ Daniel K. Schlanger

Daniel K. Schlanger
Executive Vice President and Chief Financial Officer

May 3, 2021

XML

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2021	Apr. 29, 2021
Entity Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2021
Document Transition Report	false
Entity File Number	001-16441
Entity Registrant Name	CROWN CASTLE INTERNATIONAL CORP.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	76-0470458
Entity Address, Address Line One	1220 Augusta Drive
Entity Address, Address Line Two	Suite 600
Entity Address, City or Town	Houston
Entity Address, State or Province	TX
Entity Address, Postal Zip Code	77057-2261
City Area Code	713
Local Phone Number	570-3000
Title of 12(b) Security	Common Stock, $0.01 par value
Trading Symbol	CCI
Security Exchange Name	NYSE
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
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		432,189,646
Entity Central Index Key	0001051470
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q1
Amendment Flag	false

XML

Condensed Consolidated Balance Sheet - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Assets, Current [Abstract]
Cash and cash equivalents	$ 254	$ 232
Restricted cash, current	179	144
Receivables, net	412	431
Prepaid expenses	115	95
Other current assets	216	202
Assets, Current, Total	1,176	1,104
Deferred site rental receivables	1,389	1,408
Property and equipment, net of accumulated depreciation of $11,090 and $10,803, respectively	15,149	15,162
Operating lease right-of-use assets	6,514	6,464
Goodwill	10,078	10,078
Other intangible assets, net	4,324	4,433
Other assets, net	122	119
Assets, Total	38,752	38,768
Liabilities, Current [Abstract]
Accounts payable	187	230
Accrued interest	107	199
Deferred revenues	814	704
Other accrued liabilities	334	378
Current maturities of debt and other obligations	159	129
Current portion of operating lease liabilities	332	329
Liabilities, Current, Total	1,933	1,969
Debt and other long-term obligations	19,713	19,151
Operating lease liabilities	5,856	5,808
Other long-term liabilities	2,327	2,379
Liabilities, Total	$ 29,829	$ 29,307
Common stock, par value	$ 0.01	$ 0.01
Stockholders' Equity Attributable to Parent [Abstract]
Common Stock, Value, Issued	$ 4	$ 4
Additional Paid in Capital	17,917	17,933
Accumulated Other Comprehensive Income (Loss), Net of Tax	(3)	(4)
Retained Earnings (Accumulated Deficit)	(8,995)	(8,472)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Total	8,923	9,461
Liabilities and Equity, Total	$ 38,752	$ 38,768

XML

Condensed Consolidated Balance Sheet (Parenthetical) - USD ($) shares in Millions, $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Condensed Consolidated Balance Sheet (Parenthetical) [Abstract]
Accumulated depreciation, property and equipment	$ 11,090	$ 10,803
Common stock, shares outstanding	432	431
Common stock, shares authorized	600	600
Common stock, par value	$ 0.01	$ 0.01

XML

Condensed Consolidated Statement of Operations and Comprehensive Income (Loss) - USD ($) shares in Millions, $ in Millions		3 Months Ended
		Mar. 31, 2021		Mar. 31, 2020
Net revenues:
Site Rental		$ 1,369		$ 1,310
Services and other		116		111
Net Revenues		1,485		1,421
Operating expenses:
Site rental	[1]	381		375
Services and other	[1]	81		99
Selling, general and administrative		164		175
Asset write-down charges		3		4
Acquisition and integration costs		0		5
Depreciation, amortization and accretion		408		399
Total operating expenses		1,037		1,057
Operating income (loss)		448		364
Interest expense and amortization of deferred financing costs		(170)		(175)
Gains (losses) on retirement of long-term obligations		(143)	[2]	0
Interest income		1		1
Other income (expense)		(8)		0
Income (loss) before income taxes		128		190
Benefit (provision) for income taxes		(7)		(5)
Income (loss) from continuing operations		121		185
Net gain (loss) from disposal of discontinued operations, net of tax		(63)		0
Income (loss) from discontinued operations, net of tax		(63)		0
Net income (loss)		58		185
Dividends/distributions on preferred stock		0		(28)	[3]
Net income (loss) attributable to CCIC common stockholders		58		157
Foreign currency translation adjustments		1		(1)	[4]
Total other comprehensive income (loss)	[4]	1
Comprehensive income (loss) attributable to CCIC stockholders		$ 59		$ 184
Income (loss) from continuing operations, per share - basic		$ 0.28		$ 0.38
Income (loss) from discontinued operations, per share - basic		(0.15)		0
Net income (loss) attributable to CCIC common stockholders, per share - basic		0.13		0.38
Income (loss) from continuing operations, per share - diluted		0.28		0.38
Income (loss) from discontinued operations, per share - diluted		(0.15)		0
Net income (loss) attributable to CCIC common stockholders, per share - diluted		$ 0.13		$ 0.38
Weighted-average common shares outstanding, basic		432		416
Weighted-average common shares outstanding, diluted		433		418

[1] Exclusive of depreciation, amortization and accretion shown separately.

[2] Inclusive of the write off of respective deferred financing costs.

[3] See note 7 for information regarding common and preferred stock dividends declared per share.

[4] See the condensed consolidated statement of operations and other comprehensive income (loss) for the components of other comprehensive income (loss).

XML

Condensed Consolidated Statement of Cash Flows - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021		Mar. 31, 2020
Cash flows from operating activities:
Income (loss) from continuing operations	$ 121		$ 185
Adjustments to reconcile net income (loss) from continuing operations to net cash provided by (used for) operating activities:
Depreciation, amortization and accretion	408		399
Gains (losses) on retirement of long-term obligations	143	[1]	0
Amortization of deferred financing costs and other non-cash interest, net	3		1
Stock-based compensation expense	33		37
Asset write-down charges	3		4
Deferred income tax (benefit) provision	1		1
Other non-cash adjustments, net	10		0
Changes in assets and liabilities, excluding the effects of acquisitions:
Increase (decrease) in accrued interest	(92)		(50)
Increase (decrease) in accounts payable	(23)		(20)
Increase (decrease) in other liabilities	(31)		2
Decrease (increase) in receivables	18		102
Decrease (increase) in other assets	(10)		(8)
Net cash provided by (used for) operating activities	584		653
Cash flows from investing activities:
Capital expenditures	(302)		(447)
Payments for acquisitions, net of cash acquired	(4)		(13)
Other investing activities, net	(5)		(8)
Net cash provided by (used for) investing activities	(311)		(468)
Cash flows from financing activities:
Proceeds from issuance of long-term debt	3,237		0
Principal payments on debt and other long-term obligations	(1,026)		(26)
Purchases and redemptions of long-term debt	(1,789)		0
Borrowings under revolving credit facility	580		1,340
Payments under revolving credit facility	(290)		(595)
Net issuances (repayments) under commercial paper program	(245)		(155)
Payments for financing costs	(29)		0
Purchases of common stock	(67)		(73)
Dividends/distributions paid on common stock	(588)		(513)
Dividends/distributions paid on preferred stock	0		(28)
Net cash provided by (used for) financing activities	(217)		(50)
Net increase (decrease) in cash, cash equivalents, and restricted cash	56		135
Cash, cash equivalents and restricted cash at beginning of period	381		338
Cash, cash equivalents and restricted cash at end of period	438		472
Effect of Exchange Rate on Cash and Cash Equivalents [Abstract]
Effect of exchange rate changes	$ 1		$ (1)

[1] Inclusive of the write off of respective deferred financing costs.

XML

Condensed Consolidated Statement of Equity - USD ($) shares in Millions, $ in Millions		Total	Common Stock [Member]	6.875% Mandatory Convertible Preferred Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Foreign Currency Adjustment Attributable to Parent [Member]	Dividends/Distributions in Excess of Earnings [Member]
Balance, shares Period Start at Dec. 31, 2019			416
Balance, value Period Start at Dec. 31, 2019		$ 10,489	$ 4	$ 0	$ 17,855	$ (5)	$ (7,365)
Preferred Stock, Shares Outstanding Period Start at Dec. 31, 2019				2
Stock-based compensation related activity, net of forfeitures, value		53			53
Purchases and retirement of common stock, value		(73)			(73)
Common stock dividends/distributions	[1]	(504)					504
Dividends/distributions on preferred stock	[1]	(28)					(28)
Net income (loss)		185					185
Balance, shares Period End at Mar. 31, 2020			417
Balance, value Period End at Mar. 31, 2020		$ 10,121	$ 4	$ 0	17,835	(6)	(7,712)
Preferred Stock, Shares Outstanding Period End at Mar. 31, 2020				2
Total other comprehensive income (loss)	[2]					(1)
Balance, shares Period Start at Dec. 31, 2020		431	431
Balance, value Period Start at Dec. 31, 2020		$ 9,461	$ 4	$ 0	17,933	(4)	(8,472)
Preferred Stock, Shares Outstanding Period Start at Dec. 31, 2020				0
Stock-based compensation related activity, net of forfeitures, value		51			51
Purchases and retirement of common stock, value		(67)			(67)
Common stock dividends/distributions	[1]	(581)					581
Dividends/distributions on preferred stock		0
Net income (loss)		$ 58					58
Balance, shares Period End at Mar. 31, 2021		432	432
Balance, value Period End at Mar. 31, 2021		$ 8,923	$ 4	$ 0	$ 17,917	(3)	$ (8,995)
Preferred Stock, Shares Outstanding Period End at Mar. 31, 2021				0
Total other comprehensive income (loss)	[2]	$ 1				$ 1

[1] See note 7 for information regarding common and preferred stock dividends declared per share.

[2] See the condensed consolidated statement of operations and other comprehensive income (loss) for the components of other comprehensive income (loss).

XML

Statement of Cash Flows, Supplemental Disclosures

3 Months Ended

Mar. 31, 2021

Supplemental Cash Flow Elements [Abstract]

Supplemental Cash Flow Information

Supplemental Cash Flow Information

The following table is a summary of the Company's supplemental cash flow information:

	Three Months Ended March 31,
	2021		2020
Supplemental disclosure of cash flow information:
Cash payments related to operating lease liabilities(a)	$	137	$	135
Interest paid	259		223
Income taxes paid	—		1
Supplemental disclosure of non-cash operating, investing and financing activities:
New ROU assets obtained in exchange for operating lease liabilities	132		133
Increase (decrease) in accounts payable for purchases of property and equipment	(18)		(18)
Purchase of property and equipment under finance leases and installment purchases	4		5

(a)Excludes the Company's contingent payments pursuant to operating leases, which are recorded as expense in the period such contingencies are resolved.

The reconciliation of cash, cash equivalents, and restricted cash reported within various lines on the condensed consolidated balance sheet to amounts reported in the condensed consolidated statement of cash flows is shown below.

	March 31, 2021		December 31, 2020
Cash and cash equivalents	$	254	$	232
Restricted cash, current	179		144
Restricted cash reported within other assets, net	5		5
Cash, cash equivalents and restricted cash	$	438	$	381

XML

Statement of Cash Flows, Supplemental Disclosures

3 Months Ended

Mar. 31, 2021

Supplemental Cash Flow Elements [Abstract]

Schedule of Cash Flow, Supplemental Disclosures [Table Text Block]

The following table is a summary of the Company's supplemental cash flow information:

	Three Months Ended March 31,
	2021		2020
Supplemental disclosure of cash flow information:
Cash payments related to operating lease liabilities(a)	$	137	$	135
Interest paid	259		223
Income taxes paid	—		1
Supplemental disclosure of non-cash operating, investing and financing activities:
New ROU assets obtained in exchange for operating lease liabilities	132		133
Increase (decrease) in accounts payable for purchases of property and equipment	(18)		(18)
Purchase of property and equipment under finance leases and installment purchases	4		5

(a)Excludes the Company's contingent payments pursuant to operating leases, which are recorded as expense in the period such contingencies are resolved.

Schedule of Cash, Cash Equivalents and Restricted Cash

The reconciliation of cash, cash equivalents, and restricted cash reported within various lines on the condensed consolidated balance sheet to amounts reported in the condensed consolidated statement of cash flows is shown below.

	March 31, 2021		December 31, 2020
Cash and cash equivalents	$	254	$	232
Restricted cash, current	179		144
Restricted cash reported within other assets, net	5		5
Cash, cash equivalents and restricted cash	$	438	$	381

XML

Supplemental Cash Flow Information - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Supplemental Cash Flow Information [Line Items]
Cash payments related to operating lease liabilities	[1]	$ 137	$ 135
Interest Paid		259	223
Income Taxes Paid		0	1
New ROU assets obtained in exchange for operating lease liabilities		132	133
Increase (decrease) in accounts payable for purchases of property and equipment		(18)	(18)
Purchase of property and equipment under capital leases and installment purchases		4	5
Reconciliation of cash, cash equivalents and restricted cash [Line Items]
Cash and cash equivalents		254		$ 232
Restricted cash, current		179		144
Restricted Cash, Noncurrent		5		5
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents		$ 438	$ 472	$ 381

[1] Excludes the Company's contingent payments pursuant to operating leases, which are recorded as expense in the period such contingencies are resolved.

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General

3 Months Ended

Mar. 31, 2021

General

General

General

The information contained in the following notes to the condensed consolidated financial statements is condensed from that which would appear in the annual consolidated financial statements; accordingly, the condensed consolidated financial statements included herein should be reviewed in conjunction with the consolidated financial statements for the fiscal year ended December 31, 2020, and related notes thereto, included in the 2020 Form 10-K filed by Crown Castle International Corp. ("CCIC") with the SEC. Capitalized terms used but not defined in these notes to the condensed consolidated financial statements have the same meaning given to them in the 2020 Form 10-K. References to the "Company" refer to CCIC and its predecessor, as applicable, and their subsidiaries, unless otherwise indicated or the context indicates otherwise. As used herein, the term "including," and any variation thereof means "including without limitation." The use of the word "or" herein is not exclusive. Unless the context suggests otherwise, references to "U.S." are to the United States of America and Puerto Rico, collectively.

The Company owns, operates and leases shared communications infrastructure that is geographically dispersed throughout the U.S., including (1) towers and other structures, such as rooftops (collectively, "towers"), and (2) fiber primarily supporting small cell networks ("small cells") and fiber solutions. The Company's towers, fiber and small cells assets are collectively referred to herein as "communications infrastructure," and the Company's customers on its communications infrastructure are referred to herein as "tenants."

The Company's core business is providing access, including space or capacity, to its shared communications infrastructure via long-term contracts in various forms, including lease, license, sublease and service agreements (collectively, "tenant contracts").

The Company's operating segments consist of (1) Towers and (2) Fiber. See note 10.

As part of the Company's effort to provide comprehensive communications infrastructure solutions, as an ancillary business, the Company also offers certain services primarily relating to its Towers segment, predominately consisting of (1) site development services primarily relating to existing or new tenant equipment installations, including: site acquisition, architectural and engineering, or zoning and permitting (collectively, "site development services") and (2) tenant equipment installation or subsequent augmentations (collectively, "installation services").

The Company operates as a REIT for U.S. federal income tax purposes. In addition, the Company has certain taxable REIT subsidiaries ("TRSs"). See note 6.

Approximately 53% of the Company's towers are leased or subleased or operated and managed under master leases, subleases, and other agreements with AT&T and T-Mobile, including agreements assumed by T-Mobile following its merger with Sprint, completed on April 1, 2020. The Company has the option to purchase these towers at the end of their respective lease terms. The Company has no obligation to exercise such purchase options.

Basis of Presentation

The condensed consolidated financial statements included herein are unaudited; however, they include all adjustments (consisting only of normal recurring adjustments) which, in the opinion of management, are necessary to state fairly the consolidated financial position of the Company at March 31, 2021, the condensed consolidated results of operations for the three months ended March 31, 2021 and 2020, and the condensed consolidated cash flows for the three months ended March 31, 2021 and 2020. The year-end condensed consolidated balance sheet data was derived from audited financial statements, but does not include all disclosures required by GAAP. The results of operations for the interim periods presented are not necessarily indicative of the results to be expected for the full year.

The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities as of the date of the financial statements, and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.

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Summary of Significant Accounting Policies

3 Months Ended

Mar. 31, 2021

Accounting Policies [Abstract]

Significant Accounting Policies

Summary of Significant Accounting Policies Recently Adopted Accounting Pronouncements

No accounting pronouncements adopted during the three months ended March 31, 2021 had a material impact on the Company's condensed consolidated financial statements.

Recent Accounting Pronouncements Not Yet Adopted

No new accounting pronouncements issued but not yet adopted are expected to have a material impact on the Company's condensed consolidated financial statements.

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Revenues (Notes)

3 Months Ended

Mar. 31, 2021

Revenue from Contract with Customer [Abstract]

Revenue from Contract with Customer [Text Block]

Revenues

Site rental revenues

The Company generates site rental revenues from its core business by providing tenants with access, including space or capacity, to its shared communications infrastructure via long-term tenant contracts in various forms, including lease, license, sublease and service agreements. Providing such access over the length of the tenant contract term represents the Company’s sole performance obligation under its tenant contracts.

Site rental revenues from the Company's tenant contracts are recognized on a straight-line, ratable basis over the fixed, non-cancelable term of the relevant tenant contract, which generally ranges from five to 15 years for wireless tenants and three to 20 years for the Company's fiber solutions tenants (including from organizations with high-bandwidth and multi-location demands), regardless of whether the payments from the tenant are received in equal monthly amounts during the life of the tenant contract. Certain of the Company's tenant contracts contain (1) fixed escalation clauses (such as fixed dollar or fixed percentage increases) or inflation-based escalation clauses (such as those tied to the CPI), (2) multiple renewal periods exercisable at the tenant's option and (3) only limited termination rights at the applicable tenant's option through the current term. If the payment terms call for fixed escalations, upfront payments, or rent-free periods, the revenue is recognized on a straight-line basis over the fixed, non-cancelable term of the agreement. When calculating straight-line rental revenues, the Company considers all fixed elements of tenant contractual escalation provisions, even if such escalation provisions contain a variable element in addition to a minimum. The Company's assets related to straight-line site rental revenues include current amounts of $163 million included in "Other current assets" and non-current amounts of $1.4 billion included in "Deferred site rental receivables" as of March 31, 2021. Amounts billed or received prior to being earned are deferred and reflected in "Deferred revenues" and "Other long-term liabilities." Amounts to which the Company has an unconditional right to payment, which are related to both satisfied or partially satisfied performance obligations, are recorded within "Receivables, net" on the Company's condensed consolidated balance sheet.

Services and other revenues

As part of the Company’s effort to provide comprehensive communications infrastructure solutions, as an ancillary business, the Company offers certain services primarily relating to its Towers segment, predominately consisting of (1) site development services and (2) installation services. Upon contract commencement, the Company assesses its services to tenants and identifies performance obligations for each promise to provide a distinct service.

The Company may have multiple performance obligations for site development services, which primarily include: structural analysis, zoning, permitting and construction drawings. For each of the above performance obligations, services revenues are recognized at completion of the applicable performance obligation, which represents the point at which the Company believes it has transferred goods or services to the tenant. The revenue recognized is based on an allocation of the transaction price among the performance obligations in a respective contract based on estimated standalone selling price. The volume and mix of site development services may vary among contracts and may include a combination of some or all of the above performance obligations. Payments generally are due within 45 to 60 days and generally do not contain variable-consideration provisions. The transaction price for the Company's tower installation services consists of amounts for (1) permanent improvements to the Company's towers that represent a lease component and (2) the performance of the service. Amounts under the Company's tower installation service agreements that represent a lease component are recognized as site rental revenues on a straight-line basis over the length of the associated estimated lease term. For the performance of the installation service, the Company has one performance obligation, which is satisfied at the time of the applicable installation or augmentation and recognized as services and other revenues. Since performance obligations are typically satisfied prior to receiving payment from tenants, the unconditional right to payment is recorded within "Receivables, net" on the Company’s condensed consolidated balance sheet. The vast majority of the Company’s services generally have a duration of one year or less.

Additional information on revenues

As of both January 1, 2021 and March 31, 2021, $2.8 billion of unrecognized revenue was reported in "Deferred revenues" and "Other long-term liabilities" on our condensed consolidated balance sheet. During the three months ended March 31, 2021, approximately $170 million of the January 1, 2020 unrecognized revenue balance was recognized as revenue. During the three months ended March 31, 2020, approximately $160 million of the January 1, 2020 unrecognized revenue balance was recognized as revenue.

The following table is a summary of the non-cancelable contracted amounts owed to the Company by tenants pursuant to tenant contracts in effect as of March 31, 2021.

	Nine Months Ending December 31,		Years Ending December 31,
	2021		2022		2023		2024		2025		Thereafter		Total
Contracted amounts(a)	$	3,381	$	4,228	$	3,640	$	2,936	$	2,443	$	9,979	$	26,607

(a)Based on the nature of the contract, tenant contracts are accounted for pursuant to relevant lease accounting (ASC 842) or revenue accounting (ASC 606) guidance. Excludes amounts related to services, as those contracts generally have a duration of one year or less.

See note 10 for further information regarding the Company's operating segments.

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Debt and Other Obligations

3 Months Ended

Mar. 31, 2021

Debt and Other Obligations [Abstract]

Debt and Other Obligations

Debt and Other Obligations

The table below sets forth the Company's debt and other obligations as of March 31, 2021.

	Original Issue Date		Final Maturity Date(a)		Balance as of March 31, 2021			Balance as of December 31, 2020		Stated Interest Rate as of March 31, 2021(a)
3.849% Secured Notes	Dec. 2012		Apr. 2023		$	997		$	997	3.9	%
Secured Notes, Series 2009-1, Class A-2	July 2009		Aug. 2029		59			60		9.0	%
Tower Revenue Notes, Series 2015-1	May 2015		May 2042	(b)	299			299		3.2	%
Tower Revenue Notes, Series 2018-1	July 2018		July 2043	(b)	249			248		3.7	%
Tower Revenue Notes, Series 2015-2	May 2015		May 2045	(b)	696			695		3.7	%
Tower Revenue Notes, Series 2018-2	July 2018		July 2048	(b)	743			743		4.2	%
Finance leases and other obligations	Various		Various	(c)	231			236		Various		(c)
Total secured debt					$	3,274		$	3,278
2016 Revolver	Jan. 2016		June 2024		$	580	(d)	$	290	1.2	%	(e)
2016 Term Loan A	Jan. 2016		June 2024	(g)	1,237			2,252		1.2	%	(e)
Commercial Paper Notes	Mar. 2021	(f)	Apr. 2021	(f)(g)	40		(f)	285		0.4	%
5.250% Senior Notes	Oct. 2012		Jan. 2023	(g)	—			1,646		5.3	%
3.150% Senior Notes	Jan. 2018		July 2023		746			746		3.2	%
3.200% Senior Notes	Aug. 2017		Sept. 2024		746			745		3.2	%
1.350% Senior Notes	June 2020		July 2025		495			494		1.4	%
4.450% Senior Notes	Feb. 2016		Feb. 2026		895			894		4.5	%
3.700% Senior Notes	May 2016		June 2026		745			745		3.7	%
1.050% Senior Notes	Feb. 2021		July 2026	(g)	989			—		1.1	%
4.000% Senior Notes	Feb. 2017		Mar. 2027		496			496		4.0	%
3.650% Senior Notes	Aug. 2017		Sept. 2027		994			994		3.7	%
3.800% Senior Notes	Jan. 2018		Feb. 2028		991			991		3.8	%
4.300% Senior Notes	Feb. 2019		Feb. 2029		593			593		4.3	%
3.100% Senior Notes	Aug. 2019		Nov. 2029		544			544		3.1	%
3.300% Senior Notes	Apr. 2020		July 2030		737			737		3.3	%
2.250% Senior Notes	June 2020		Jan. 2031		1,088			1,088		2.3	%
2.100% Senior Notes	Feb. 2021		Apr. 2031	(g)	987			—		2.1	%
2.900% Senior Notes	Feb. 2021		Apr. 2041	(g)	1,233			—		2.9	%
4.750% Senior Notes	May 2017		May 2047		344			344		4.8	%
5.200% Senior Notes	Feb. 2019		Feb. 2049		395			395		5.2	%
4.000% Senior Notes	Aug. 2019		Nov. 2049		345			345		4.0	%
4.150% Senior Notes	Apr. 2020		July 2050		489			489		4.2	%
3.250% Senior Notes	June 2020		Jan. 2051		889			889		3.3	%
Total unsecured debt					$	16,598		$	16,002
Total debt and other obligations					19,872			19,280
Less: current maturities and short-term debt and other current obligations					159			129
Non-current portion of long-term debt and other long-term obligations					$	19,713		$	19,151

(a)See the 2020 Form 10-K, including note 7, for additional information regarding the maturity and principal amortization provisions and interest rates relating to the Company's indebtedness.

(b)If the respective series of Tower Revenue Notes are not paid in full on or prior to an applicable anticipated repayment date, then Excess Cash Flow (as defined in the indenture) of the issuers of such notes will be used to repay principal of the applicable series and class of the Tower Revenue Notes, and additional interest (of an additional approximately 5% per annum) will accrue on the respective Tower Revenue Notes. As of March 31, 2021, the Tower Revenue Notes have principal amounts of $300 million, $250 million, $700 million and $750 million, with anticipated repayment dates in 2022, 2023, 2025 and 2028, respectively.

(c)The Company's finance leases and other obligations relate to land, fiber, vehicles, and other assets and bear interest rates ranging up to 10% and mature in periods ranging from less than one year to approximately 25 years.

(d)As of March 31, 2021, the undrawn availability under the 2016 Revolver was $4.4 billion.

(e)Both the 2016 Revolver and 2016 Term Loan A bear interest, at our option, at either (1) LIBOR plus a credit spread ranging from 0.875% to 1.750% per annum or (2) an alternate base rate plus a credit spread ranging from 0.000% to 0.750% per annum, in each case, with the applicable credit spread based

on the Company's senior unsecured debt rating. The Company pays a commitment fee ranging from 0.125% to 0.350%, based on the Company's senior unsecured debt rating, per annum on the undrawn available amount under the 2016 Revolver.

(f)Notes under the CP Program may be issued, repaid and re-issued from time to time, with an aggregate principal amount of Commercial Paper Notes outstanding under the CP Program at any time not to exceed $1.0 billion. The net proceeds of the Commercial Paper Notes are expected to be used for general corporate purposes. The maturities of the Commercial Paper Notes, when outstanding, may vary but may not exceed 397 days from the date of issue. The Commercial Paper Notes are issued under customary terms in the commercial paper market and are issued at a discount from par or, alternatively, can be issued at par and bear varying interest rates on a fixed or floating basis. As of March 31, 2021, the Company had net issuances of $40 million under the CP Program. At any point in time, the Company intends to maintain available commitments under its 2016 Revolver in an amount at least equal to the amount of Commercial Paper Notes outstanding. While any outstanding Commercial Paper Notes generally have short-term maturities, the Company classifies the outstanding issuances, when applicable, as long-term based on its ability and intent to refinance the outstanding issuances on a long-term basis.

(g)In February 2021, the Company issued $3.25 billion aggregate principal amount of senior unsecured notes ("February 2021 Senior Notes"), which consisted of (1) $1.0 billion aggregate principal amount of 1.050% senior unsecured notes due July 2026, (2) $1.0 billion aggregate principal amount of 2.100% senior unsecured notes due April 2031 and (3) $1.25 billion aggregate principal amount of 2.900% senior unsecured notes due April 2041. The Company used the net proceeds from the February 2021 Senior Notes offering to (1) redeem all of the outstanding 5.250% Senior Notes, (2) repay a portion of the outstanding Commercial Paper Notes and (3) repay a portion of outstanding borrowings under the 2016 Term Loan A.

Scheduled Principal Payments and Final Maturities

The following are the scheduled principal payments and final maturities of the total debt and other long-term obligations of the Company outstanding as of March 31, 2021, which do not consider the principal payments that will commence following the anticipated repayment dates on the Tower Revenue Notes.

	Nine Months Ending December 31,		Years Ending December 31,												Unamortized Adjustments, Net		Total Debt and Other Obligations Outstanding
	2021		2022		2023		2024		2025		Thereafter		Total Cash Obligations
Scheduled principal payments and final maturities	$	161	$	155	$	1,988	$	2,187	$	525	$	15,032	$	20,048	$	(176)	$	19,872

Purchases and Redemptions of Long-Term Debt

The following is a summary of purchases and redemptions of long-term debt during the three months ended March 31, 2021.

	Principal Amount		Cash Paid(a)		Gains (Losses)(b)
5.250% Senior Notes	$	1,650	$	1,789	$	(143)
Total	$	1,650	$	1,789	$	(143)

(a)Exclusive of accrued interest.

(b)Inclusive of the write off of respective deferred financing costs.

Interest Expense and Amortization of Deferred Financing Costs

The components of interest expense and amortization of deferred financing costs are as follows:

	Three Months Ended March 31,
	2021		2020
Interest expense on debt obligations	$	167	$	174
Amortization of deferred financing costs and adjustments on long-term debt	6		5
Capitalized interest	(3)		(4)
Total	$	170	$	175

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Fair Value Disclosures

3 Months Ended

Mar. 31, 2021

Fair Value Disclosures [Abstract]

Fair Value Disclosures

Fair Value Disclosures

	Level in Fair Value Hierarchy	March 31, 2021				December 31, 2020
		Carrying  Amount		Fair Value		Carrying  Amount		Fair Value
Assets:
Cash and cash equivalents	1	$	254	$	254	$	232	$	232
Restricted cash, current and non-current	1	184		184		149		149
Liabilities:
Total debt and other obligations	2	19,872		20,718		19,280		21,302

The fair value of cash and cash equivalents and restricted cash approximate the carrying value. The Company determines the fair value of its debt securities based on indicative, non-binding quotes from brokers. Quotes from brokers require judgment and are based on the brokers' interpretation of market information, including implied credit spreads for similar borrowings on recent trades or bid/ask prices or quotes from active markets if available. Since December 31, 2020, there have been no changes in the Company's valuation techniques used to measure fair values.

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Income Taxes

3 Months Ended

Mar. 31, 2021

Income Tax Disclosure [Abstract]

Income Taxes

Income Taxes

The Company operates as a REIT for U.S. federal income tax purposes. As a REIT, the Company is generally entitled to a deduction for dividends that it pays and therefore is not subject to U.S. federal corporate income tax on its net taxable income that is currently distributed to its stockholders. The Company also may be subject to certain federal, state, local and foreign taxes on its income and assets, including (1) taxes on any undistributed income, (2) taxes related to the TRSs, (3) franchise taxes, (4) property taxes, and (5) transfer taxes. In addition, the Company could under certain circumstances be required to pay an excise or penalty tax, which could be significant in amount, in order to utilize one or more relief provisions under the Internal Revenue Code of 1986, as amended, to maintain qualification for taxation as a REIT.

The Company's TRS assets and operations will continue to be subject, as applicable, to federal and state corporate income taxes or to foreign taxes in the jurisdictions in which such assets and operations are located. The Company's foreign assets and operations (including its tower operations in Puerto Rico) are subject to foreign income taxes in the jurisdictions in which such assets and operations are located, regardless of whether they are included in a TRS or not.

For the three months ended March 31, 2021 and 2020, the Company's effective tax rate differed from the federal statutory rate predominately due to the Company's REIT status, including the dividends paid deduction.

See also note 12 for a discussion of the Company's agreement in principle with the Australian Taxation Office ("ATO").

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Per Share Information

3 Months Ended

Mar. 31, 2021

Earnings Per Share [Abstract]

Per Share Information

Per Share InformationBasic net income (loss) attributable to CCIC common stockholders, per common share, excludes dilution and is computed by dividing net income (loss) attributable to CCIC common stockholders by the weighted-average number of common shares outstanding during the period. For the three months ended March 31, 2021 and 2020, diluted net income (loss) attributable to CCIC common stockholders, per common share, is computed by dividing net income (loss) attributable to CCIC common stockholders by the weighted-average number of common shares outstanding during the period, plus any potential dilutive common share equivalents, including shares issuable upon (1) the vesting of restricted stock units as determined under the treasury stock method and (2) conversion of the Company's previously outstanding 6.875% Mandatory Convertible Preferred Stock, as applicable, as determined under the if-converted method.

	Three Months Ended March 31,
	2021		2020
Income (loss) from continuing operations	$	121	$	185
Dividends on preferred stock	—		(28)
Income (loss) from continuing operations attributable to CCIC common stockholders for basic and diluted computations	$	121	$	157
Income (loss) from discontinued operations, net of tax	$	(63)	$	—
Net income (loss) attributable to CCIC common stockholders	$	58	$	157
Weighted-average number of common shares outstanding (in millions):
Basic weighted-average number of common stock outstanding	432		416
Effect of assumed dilution from potential issuance of common shares relating to restricted stock units	1		2
Diluted weighted-average number of common shares outstanding	433		418
Net income (loss) attributable to CCIC common stockholders, per common share:
Income (loss) from continuing operations, basic	$	0.28	$	0.38
Income (loss) from discontinued operations, basic	(0.15)		—
Net income (loss) attributable to CCIC common stockholders—basic	$	0.13	$	0.38
Income (loss) from continuing operations, diluted	$	0.28	$	0.38
Income (loss) from discontinued operations, diluted	(0.15)		—
Net income (loss) attributable to CCIC common stockholders—diluted	$	0.13	$	0.38
Dividends/distributions declared per share of common stock	$	1.33	$	1.20
Dividends/distributions declared per share of preferred stock	$	—	$	17.1875

During the three months ended March 31, 2021, the Company granted one million restricted stock units to the Company's executives and certain other employees pursuant to its 2013 Long-Term Incentive Plan.

For the three months ended March 31, 2020, approximately 14.5 million common share equivalents related to the previously outstanding 6.875% Mandatory Convertible Preferred Stock were excluded from the dilutive common shares because the impact of such conversion would be anti-dilutive, based on the Company's common stock price as of March 31, 2020.

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Commitments and Contingencies

3 Months Ended

Mar. 31, 2021

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

Commitments and Contingencies

Shareholder Litigation

In February and March 2020, putative securities class action suits were filed in the United States District Court for the District of New Jersey against the Company and certain of its current officers. The lawsuits were filed on behalf of investors that purchased or otherwise acquired stock of the Company between February 26, 2018 and February 26, 2020. The allegations concern allegedly false or misleading statements or other alleged failures to disclose information about the Company's business, operations and prospects. The plaintiffs seek monetary damages and the award of the plaintiffs' costs and expenses incurred. In December 2020, the cases were consolidated as In re Crown Castle International Corp. Securities Litigation, No. 2:20-cv-02156 in the United States District Court for the District of New Jersey. The Company is currently unable to determine the likelihood of an outcome or estimate a range of reasonably possible losses, if any. The Company believes the putative class action is without merit and intends to defend itself vigorously.

During the quarter ended June 30, 2020, derivative lawsuits were filed in the United States District Court for the District of Delaware, against the Company's then-current directors and certain of its current officers and the Company as a nominal defendant. Each complaint alleges, among other things, breaches of fiduciary duties, waste of corporate assets, unjust enrichment, and false or misleading statements. The derivative plaintiffs seek, among other things, unspecified monetary damages, costs and expenses, restitution from the defendants, and an order requiring the Company to implement certain

corporate governance reforms. As a nominal defendant, no monetary relief is sought against the Company itself. In June 2020, the derivative lawsuits were consolidated as In re Crown Castle International Corp. Derivative Litigation, C.A. No. 20-00606-MN in the United States District Court for the District of Delaware. The consolidated derivative action is currently stayed pending the resolution of any motion to dismiss In re Crown Castle International Corp. Securities Litigation in the United States District Court for the District of New Jersey.

Durham Lawsuits

The Company has received notices of claims and has been named as one of several defendants in lawsuits stemming from an April 2019 gas leak explosion in Durham, North Carolina, which occurred near an area where the Company's subcontractors were installing fiber. The explosion resulted in two fatalities, physical injuries (some of which were serious), and property damage to surrounding buildings and businesses. Currently, the Company is unable to determine the likelihood of an outcome or estimate a range of possible losses, if any, related to these lawsuits.

New York State Department of Transportation

In 2019, the State of New York passed legislation authorizing the Department of Transportation ("NYSDOT") to enter into agreements with any fiber provider for the use and occupancy of the state right-of-way for fiber optic lines. The legislation authorizes the NYSDOT to charge a fee of up to fair market value for such use and occupancy. To date, the Company has paid fees relating to newly deployed fiber lines but has not been required to pay, and has not recognized any costs in connection with, any fees relating to previously deployed fiber lines.

The Company believes that the legislation violates both federal and state law and is evaluating its legal options regarding any use and occupancy fees that may be assessed on previously deployed fiber. Currently, the Company is unable to determine the likelihood of an outcome or reasonably estimate the amount of fees, if any, that it may be required to pay as a result of the legislation.

Other Matters

The Company is involved in various other claims, assessments, lawsuits or proceedings arising in the ordinary course of business. While there are uncertainties inherent in the ultimate outcome of such other matters and it is impossible to presently determine the ultimate costs or losses that may be incurred, if any, management believes the adverse resolution of such uncertainties and the incurrence of such costs should not have a material adverse effect on the Company's condensed consolidated financial position or results of operations. Additionally, the Company and certain of its subsidiaries are contingently liable for commitments or performance guarantees arising in the ordinary course of business, including certain letters of credit or surety bonds. In addition, see note 1 for a discussion of the Company's option to purchase approximately 53% of its towers at the end of their respective lease terms. The Company has no obligation to exercise such purchase options.

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Equity

3 Months Ended

Mar. 31, 2021

Equity [Abstract]

Equity

Equity

Declaration and Payment of Dividends

During the three months ended March 31, 2021, the following dividends/distributions were declared or paid:

Equity Type	Declaration Date	Record Date	Payment Date	Dividends Per Share		Aggregate Payment Amount
Common Stock	February 18, 2021	March 15, 2021	March 31, 2021	$	1.33	$	581	(a)

(a)Inclusive of dividends accrued for holders of unvested restricted stock units, which will be paid when and if the restricted stock units vest.

Purchases of the Company's Common Stock

For the three months ended March 31, 2021, the Company purchased 0.4 million shares of its common stock utilizing $67 million in cash. The shares of common stock purchased relate to shares withheld in connection with the payment of withholding taxes upon vesting of restricted stock units.

2018 "At-the-Market" Stock Offering Program

The Company previously maintained an "at-the-market" stock offering program through which it had the right to issue and sell shares of its common stock having an aggregate gross sales price of up to $750 million ("2018 ATM Program"). The Company terminated its previously outstanding 2018 ATM Program in March 2021 with the entire gross sales price of $750 million remaining unsold.

2021 "At-the-Market" Stock Offering Program

In March 2021, the Company established a new "at-the-market" stock offering program through which it may issue and sell shares of its common stock having an aggregate gross sales price of up to $750 million ("2021 ATM Program"). Sales under the 2021 ATM Program may be made by means of ordinary brokers' transactions on the NYSE or otherwise at market prices prevailing at the time of sale, at prices related to prevailing market prices or, subject to the Company's specific instructions, at negotiated prices. The Company intends to use the net proceeds from any sales under the 2021 ATM Program for general corporate purposes, which may include (1) the funding of future acquisitions or investments or (2) the repayment or repurchase of any outstanding indebtedness. The Company has not sold any shares of common stock under the 2021 ATM Program.

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Operating Segments

3 Months Ended

Mar. 31, 2021

Segment Reporting [Abstract]

Operating Segments

Operating Segments

The Company's operating segments consist of (1) Towers and (2) Fiber. The Towers segment provides access, including space or capacity, to the Company's approximately 40,000 towers geographically dispersed throughout the U.S. The Towers segment also reflects certain ancillary services relating to the Company's towers, predominately consisting of site development services and installation services. The Fiber segment provides access, including space or capacity, to the Company's approximately 80,000 route miles of fiber primarily supporting small cell networks and fiber solutions geographically dispersed throughout the U.S.

The measurements of profit or loss used by the Company's chief operating decision maker ("CODM") to evaluate the performance of its operating segments are (1) segment site rental gross margin, (2) segment services and other gross margin and (3) segment operating profit. The Company defines segment site rental gross margin as segment site rental revenues less segment site rental cost of operations, which excludes stock-based compensation expense and prepaid lease purchase price adjustments recorded in consolidated cost of operations. The Company defines segment services and other gross margin as segment services and other revenues less segment services and other cost of operations, which excludes stock-based compensation expense recorded in consolidated cost of operations. The Company defines segment operating profit as segment site rental gross margin plus segment services and other gross margin, and segment other operating (income) expense, less selling, general and administrative expenses attributable to the respective segment. All of these measurements of profit or loss are exclusive of depreciation, amortization and accretion, which are shown separately.

The following tables set forth the Company's segment operating results for the three months ended March 31, 2021 and 2020. Costs that are directly attributable to Towers and Fiber are assigned to those respective segments. Additionally, certain costs are shared across segments and are reflected in the Company's segment measures through allocations that management believes to be reasonable. The "Other" column (1) represents amounts excluded from specific segments, such as asset write-down charges, acquisition and integration costs, depreciation, amortization and accretion, amortization of prepaid lease purchase price adjustments, interest expense and amortization of deferred financing costs, gains (losses) on retirement of long-term obligations, net gain (loss) on interest rate swaps, gains (losses) on foreign currency swaps, interest income, other income (expense), income (loss) from discontinued operations, and stock-based compensation expense, and (2) reconciles segment operating profit to income (loss) before income taxes, as the amounts are not utilized in assessing each segment’s performance. The "Other" total assets balance includes corporate assets such as cash and cash equivalents which have not been allocated to specific segments. There are no significant revenues resulting from transactions between the Company's operating segments.

	Three Months Ended March 31, 2021								Three Months Ended March 31, 2020
	Towers		Fiber		Other		Consolidated Total		Towers		Fiber		Other		Consolidated Total
Segment site rental revenues	$	895	$	474			$	1,369	$	867	$	443			$	1,310
Segment services and other revenues	111		5				116		108		3				111
Segment revenues	1,006		479				1,485		975		446				1,421
Segment site rental cost of operations	212		161				373		214		152				366
Segment services and other cost of operations	76		3				79		95		2				97
Segment cost of operations(a)(b)	288		164				452		309		154				463
Segment site rental gross margin	683		313				996		653		291				944
Segment services and other gross margin	35		2				37		13		1				14
Segment selling, general and administrative expenses(b)	25		45				70		24		51				75
Segment operating profit (loss)	693		270				963		642		241				883
Other selling, general and administrative expenses					$	66	66						$	70	70
Stock-based compensation expense					33		33						36		36
Depreciation, amortization and accretion					408		408						399		399
Interest expense and amortization of deferred financing costs					170		170						175		175
Other (income) expenses to reconcile to income (loss) before income taxes(c)					158		158						13		13
Income (loss) before income taxes							$	128							$	190
Capital expenditures	$	51	$	237	$	14	$	302	$	105	$	328	$	14	$	447
Total assets (at period end)	$	22,080	$	15,771	$	901	$	38,752	$	22,234	$	15,520	$	862	$	38,616

(a)Exclusive of depreciation, amortization and accretion shown separately.

(b)Segment cost of operations excludes (1) stock-based compensation of $5 million and $6 million for the three months ended March 31, 2021 and 2020, respectively, and (2) prepaid lease purchase price adjustments of $5 million for both of the three months ended March 31, 2021 and 2020. Selling, general and administrative expenses exclude stock-based compensation expense of $28 million and $30 million for the three months ended March 31, 2021 and 2020, respectively.

(c)See condensed consolidated statement of operations for further information.

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Subsequent Events	3 Months Ended
	Mar. 31, 2021
Subsequent Events [Abstract]
Subsequent Events [Text Block]	Subsequent EventsOn April 26, 2021, the Company entered into an agreement in principle with the ATO to pay approximately $63 million (A$83 million) to settle the previously-disclosed outstanding audit of the Australian tax consequences of the Company’s 2015 sale of Crown Castle Australia Holdings Pty Ltd ("CCAL"), formerly a 77.6% owned Australian subsidiary of the Company ("ATO Settlement"). The sale of CCAL generated approximately $1.2 billion in net proceeds to the Company, and resulted in a gain from the disposal of discontinued operations of $979 million for the year ended December 31, 2015.The ATO Settlement was reflected in the condensed consolidated financial statements of the Company as of and for the three months ended March 31, 2021. The Company recognized the ATO settlement as a charge within discontinued operations in its condensed consolidated statement of operations and comprehensive income (loss) for the three months ended March 31, 2021, as this amount represents a reduction to the gain from the disposal of discontinued operations previously reported during the year ended December 31, 2015. Additionally, the ATO Settlement was recorded within "Other accrued liabilities" on the Company’s condensed consolidated balance sheet as of March 31, 2021.

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Summary of Significant Accounting Policies (Policies)

3 Months Ended

Mar. 31, 2021

Accounting Policies [Abstract]

Recent accounting prounouncements

Recently Adopted Accounting Pronouncements

No accounting pronouncements adopted during the three months ended March 31, 2021 had a material impact on the Company's condensed consolidated financial statements.

Recent Accounting Pronouncements Not Yet Adopted

No new accounting pronouncements issued but not yet adopted are expected to have a material impact on the Company's condensed consolidated financial statements.

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Revenues (Tables)

3 Months Ended

Mar. 31, 2021

Revenue from Contract with Customer [Abstract]

Schedule of Contractual Revenue

The following table is a summary of the non-cancelable contracted amounts owed to the Company by tenants pursuant to tenant contracts in effect as of March 31, 2021.

	Nine Months Ending December 31,		Years Ending December 31,
	2021		2022		2023		2024		2025		Thereafter		Total
Contracted amounts(a)	$	3,381	$	4,228	$	3,640	$	2,936	$	2,443	$	9,979	$	26,607

(a)Based on the nature of the contract, tenant contracts are accounted for pursuant to relevant lease accounting (ASC 842) or revenue accounting (ASC 606) guidance. Excludes amounts related to services, as those contracts generally have a duration of one year or less.

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Debt and Other Obligations (Tables)

3 Months Ended

Mar. 31, 2021

Extinguishment of Debt [Line Items]

Schedule of Long-Term Debt Instruments

The table below sets forth the Company's debt and other obligations as of March 31, 2021.

	Original Issue Date		Final Maturity Date(a)		Balance as of March 31, 2021			Balance as of December 31, 2020		Stated Interest Rate as of March 31, 2021(a)
3.849% Secured Notes	Dec. 2012		Apr. 2023		$	997		$	997	3.9	%
Secured Notes, Series 2009-1, Class A-2	July 2009		Aug. 2029		59			60		9.0	%
Tower Revenue Notes, Series 2015-1	May 2015		May 2042	(b)	299			299		3.2	%
Tower Revenue Notes, Series 2018-1	July 2018		July 2043	(b)	249			248		3.7	%
Tower Revenue Notes, Series 2015-2	May 2015		May 2045	(b)	696			695		3.7	%
Tower Revenue Notes, Series 2018-2	July 2018		July 2048	(b)	743			743		4.2	%
Finance leases and other obligations	Various		Various	(c)	231			236		Various		(c)
Total secured debt					$	3,274		$	3,278
2016 Revolver	Jan. 2016		June 2024		$	580	(d)	$	290	1.2	%	(e)
2016 Term Loan A	Jan. 2016		June 2024	(g)	1,237			2,252		1.2	%	(e)
Commercial Paper Notes	Mar. 2021	(f)	Apr. 2021	(f)(g)	40		(f)	285		0.4	%
5.250% Senior Notes	Oct. 2012		Jan. 2023	(g)	—			1,646		5.3	%
3.150% Senior Notes	Jan. 2018		July 2023		746			746		3.2	%
3.200% Senior Notes	Aug. 2017		Sept. 2024		746			745		3.2	%
1.350% Senior Notes	June 2020		July 2025		495			494		1.4	%
4.450% Senior Notes	Feb. 2016		Feb. 2026		895			894		4.5	%
3.700% Senior Notes	May 2016		June 2026		745			745		3.7	%
1.050% Senior Notes	Feb. 2021		July 2026	(g)	989			—		1.1	%
4.000% Senior Notes	Feb. 2017		Mar. 2027		496			496		4.0	%
3.650% Senior Notes	Aug. 2017		Sept. 2027		994			994		3.7	%
3.800% Senior Notes	Jan. 2018		Feb. 2028		991			991		3.8	%
4.300% Senior Notes	Feb. 2019		Feb. 2029		593			593		4.3	%
3.100% Senior Notes	Aug. 2019		Nov. 2029		544			544		3.1	%
3.300% Senior Notes	Apr. 2020		July 2030		737			737		3.3	%
2.250% Senior Notes	June 2020		Jan. 2031		1,088			1,088		2.3	%
2.100% Senior Notes	Feb. 2021		Apr. 2031	(g)	987			—		2.1	%
2.900% Senior Notes	Feb. 2021		Apr. 2041	(g)	1,233			—		2.9	%
4.750% Senior Notes	May 2017		May 2047		344			344		4.8	%
5.200% Senior Notes	Feb. 2019		Feb. 2049		395			395		5.2	%
4.000% Senior Notes	Aug. 2019		Nov. 2049		345			345		4.0	%
4.150% Senior Notes	Apr. 2020		July 2050		489			489		4.2	%
3.250% Senior Notes	June 2020		Jan. 2051		889			889		3.3	%
Total unsecured debt					$	16,598		$	16,002
Total debt and other obligations					19,872			19,280
Less: current maturities and short-term debt and other current obligations					159			129
Non-current portion of long-term debt and other long-term obligations					$	19,713		$	19,151

(a)See the 2020 Form 10-K, including note 7, for additional information regarding the maturity and principal amortization provisions and interest rates relating to the Company's indebtedness.

(b)If the respective series of Tower Revenue Notes are not paid in full on or prior to an applicable anticipated repayment date, then Excess Cash Flow (as defined in the indenture) of the issuers of such notes will be used to repay principal of the applicable series and class of the Tower Revenue Notes, and additional interest (of an additional approximately 5% per annum) will accrue on the respective Tower Revenue Notes. As of March 31, 2021, the Tower Revenue Notes have principal amounts of $300 million, $250 million, $700 million and $750 million, with anticipated repayment dates in 2022, 2023, 2025 and 2028, respectively.

(c)The Company's finance leases and other obligations relate to land, fiber, vehicles, and other assets and bear interest rates ranging up to 10% and mature in periods ranging from less than one year to approximately 25 years.

(d)As of March 31, 2021, the undrawn availability under the 2016 Revolver was $4.4 billion.

(e)Both the 2016 Revolver and 2016 Term Loan A bear interest, at our option, at either (1) LIBOR plus a credit spread ranging from 0.875% to 1.750% per annum or (2) an alternate base rate plus a credit spread ranging from 0.000% to 0.750% per annum, in each case, with the applicable credit spread based

on the Company's senior unsecured debt rating. The Company pays a commitment fee ranging from 0.125% to 0.350%, based on the Company's senior unsecured debt rating, per annum on the undrawn available amount under the 2016 Revolver.

(f)Notes under the CP Program may be issued, repaid and re-issued from time to time, with an aggregate principal amount of Commercial Paper Notes outstanding under the CP Program at any time not to exceed $1.0 billion. The net proceeds of the Commercial Paper Notes are expected to be used for general corporate purposes. The maturities of the Commercial Paper Notes, when outstanding, may vary but may not exceed 397 days from the date of issue. The Commercial Paper Notes are issued under customary terms in the commercial paper market and are issued at a discount from par or, alternatively, can be issued at par and bear varying interest rates on a fixed or floating basis. As of March 31, 2021, the Company had net issuances of $40 million under the CP Program. At any point in time, the Company intends to maintain available commitments under its 2016 Revolver in an amount at least equal to the amount of Commercial Paper Notes outstanding. While any outstanding Commercial Paper Notes generally have short-term maturities, the Company classifies the outstanding issuances, when applicable, as long-term based on its ability and intent to refinance the outstanding issuances on a long-term basis.

(g)In February 2021, the Company issued $3.25 billion aggregate principal amount of senior unsecured notes ("February 2021 Senior Notes"), which consisted of (1) $1.0 billion aggregate principal amount of 1.050% senior unsecured notes due July 2026, (2) $1.0 billion aggregate principal amount of 2.100% senior unsecured notes due April 2031 and (3) $1.25 billion aggregate principal amount of 2.900% senior unsecured notes due April 2041. The Company used the net proceeds from the February 2021 Senior Notes offering to (1) redeem all of the outstanding 5.250% Senior Notes, (2) repay a portion of the outstanding Commercial Paper Notes and (3) repay a portion of outstanding borrowings under the 2016 Term Loan A.

Schedule of Maturities of Long-term Debt

The following are the scheduled principal payments and final maturities of the total debt and other long-term obligations of the Company outstanding as of March 31, 2021, which do not consider the principal payments that will commence following the anticipated repayment dates on the Tower Revenue Notes.

	Nine Months Ending December 31,		Years Ending December 31,												Unamortized Adjustments, Net		Total Debt and Other Obligations Outstanding
	2021		2022		2023		2024		2025		Thereafter		Total Cash Obligations
Scheduled principal payments and final maturities	$	161	$	155	$	1,988	$	2,187	$	525	$	15,032	$	20,048	$	(176)	$	19,872

Debt Instrument Redemption [Table Text Block]

Purchases and Redemptions of Long-Term Debt

The following is a summary of purchases and redemptions of long-term debt during the three months ended March 31, 2021.

	Principal Amount		Cash Paid(a)		Gains (Losses)(b)
5.250% Senior Notes	$	1,650	$	1,789	$	(143)
Total	$	1,650	$	1,789	$	(143)

(a)Exclusive of accrued interest.

(b)Inclusive of the write off of respective deferred financing costs.

Components of Interest Expense and Amortization of Deferred Financing Costs

Interest Expense and Amortization of Deferred Financing Costs

The components of interest expense and amortization of deferred financing costs are as follows:

	Three Months Ended March 31,
	2021		2020
Interest expense on debt obligations	$	167	$	174
Amortization of deferred financing costs and adjustments on long-term debt	6		5
Capitalized interest	(3)		(4)
Total	$	170	$	175

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Fair Value Disclosures (Tables)

3 Months Ended

Mar. 31, 2021

Fair Value Disclosures [Abstract]

Estimated Fair Values and Carrying Amounts of Assets and Liabilities

	Level in Fair Value Hierarchy	March 31, 2021				December 31, 2020
		Carrying  Amount		Fair Value		Carrying  Amount		Fair Value
Assets:
Cash and cash equivalents	1	$	254	$	254	$	232	$	232
Restricted cash, current and non-current	1	184		184		149		149
Liabilities:
Total debt and other obligations	2	19,872		20,718		19,280		21,302

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Per Share Information (Tables)

3 Months Ended

Mar. 31, 2021

Earnings Per Share [Abstract]

Reconciliation of the Numerators and Denominators of the Basic and Diluted Per Share Computations

	Three Months Ended March 31,
	2021		2020
Income (loss) from continuing operations	$	121	$	185
Dividends on preferred stock	—		(28)
Income (loss) from continuing operations attributable to CCIC common stockholders for basic and diluted computations	$	121	$	157
Income (loss) from discontinued operations, net of tax	$	(63)	$	—
Net income (loss) attributable to CCIC common stockholders	$	58	$	157
Weighted-average number of common shares outstanding (in millions):
Basic weighted-average number of common stock outstanding	432		416
Effect of assumed dilution from potential issuance of common shares relating to restricted stock units	1		2
Diluted weighted-average number of common shares outstanding	433		418
Net income (loss) attributable to CCIC common stockholders, per common share:
Income (loss) from continuing operations, basic	$	0.28	$	0.38
Income (loss) from discontinued operations, basic	(0.15)		—
Net income (loss) attributable to CCIC common stockholders—basic	$	0.13	$	0.38
Income (loss) from continuing operations, diluted	$	0.28	$	0.38
Income (loss) from discontinued operations, diluted	(0.15)		—
Net income (loss) attributable to CCIC common stockholders—diluted	$	0.13	$	0.38
Dividends/distributions declared per share of common stock	$	1.33	$	1.20
Dividends/distributions declared per share of preferred stock	$	—	$	17.1875

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Equity (Tables)

3 Months Ended

Mar. 31, 2021

Equity [Abstract]

Dividends Declared

Declaration and Payment of Dividends

During the three months ended March 31, 2021, the following dividends/distributions were declared or paid:

Equity Type	Declaration Date	Record Date	Payment Date	Dividends Per Share		Aggregate Payment Amount
Common Stock	February 18, 2021	March 15, 2021	March 31, 2021	$	1.33	$	581	(a)

(a)Inclusive of dividends accrued for holders of unvested restricted stock units, which will be paid when and if the restricted stock units vest.

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Operating Segments Operating Segments (Tables)

3 Months Ended

Mar. 31, 2021

Segment Reporting [Abstract]

Schedule of Segment Reporting Information, by Segment

	Three Months Ended March 31, 2021								Three Months Ended March 31, 2020
	Towers		Fiber		Other		Consolidated Total		Towers		Fiber		Other		Consolidated Total
Segment site rental revenues	$	895	$	474			$	1,369	$	867	$	443			$	1,310
Segment services and other revenues	111		5				116		108		3				111
Segment revenues	1,006		479				1,485		975		446				1,421
Segment site rental cost of operations	212		161				373		214		152				366
Segment services and other cost of operations	76		3				79		95		2				97
Segment cost of operations(a)(b)	288		164				452		309		154				463
Segment site rental gross margin	683		313				996		653		291				944
Segment services and other gross margin	35		2				37		13		1				14
Segment selling, general and administrative expenses(b)	25		45				70		24		51				75
Segment operating profit (loss)	693		270				963		642		241				883
Other selling, general and administrative expenses					$	66	66						$	70	70
Stock-based compensation expense					33		33						36		36
Depreciation, amortization and accretion					408		408						399		399
Interest expense and amortization of deferred financing costs					170		170						175		175
Other (income) expenses to reconcile to income (loss) before income taxes(c)					158		158						13		13
Income (loss) before income taxes							$	128							$	190
Capital expenditures	$	51	$	237	$	14	$	302	$	105	$	328	$	14	$	447
Total assets (at period end)	$	22,080	$	15,771	$	901	$	38,752	$	22,234	$	15,520	$	862	$	38,616

(a)Exclusive of depreciation, amortization and accretion shown separately.

(b)Segment cost of operations excludes (1) stock-based compensation of $5 million and $6 million for the three months ended March 31, 2021 and 2020, respectively, and (2) prepaid lease purchase price adjustments of $5 million for both of the three months ended March 31, 2021 and 2020. Selling, general and administrative expenses exclude stock-based compensation expense of $28 million and $30 million for the three months ended March 31, 2021 and 2020, respectively.

(c)See condensed consolidated statement of operations for further information.

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General Business (Details)	Mar. 31, 2021
Subject to Capital Lease with TMO or AT&T [Member]
Purchase Option, Percentage of Towers	53.00%

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Revenues (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Revenue Recognition Non-cancelable Lease Term for Wireless Tenants		five to 15 years
Revenue Recognition for Fiber Solutions Tenants		three to 20 years
Deferred site rental receivables		$ 1,389		$ 1,408
Revenue, Performance Obligation, Description of Payment Terms		45 to 60 days
Revenue, Remaining Performance Obligation, Amount		$ 2,800		$ 2,800
Revenue Recognized on Deferred Revenues		170	$ 160
Contracted Amounts Receivable from Customers, remaining nine months	[1]	3,381
Contracted Amounts Receivable from Customers, in Two Years	[1]	4,228
Contracted Amounts Receivable from Customers, in Three Years	[1]	3,640
Contracted Amounts Receivable from Customers, in Four Years	[1]	2,936
Contracted Amounts Receivable from Customers, in Five Years	[1]	2,443
Contracted Amounts Receivable from Customers, Thereafter	[1]	9,979
Contracted Amounts Receivable from Customers, Total	[1]	26,607
Other Current Assets [Member]
Deferred site rental receivables		163
Other Noncurrent Assets [Member]
Deferred site rental receivables		$ 1,400

[1] Based on the nature of the contract, tenant contracts are accounted for pursuant to relevant lease accounting (ASC 842) or revenue accounting (ASC 606) guidance. Excludes amounts related to services, as those contracts generally have a duration of one year or less.

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Debt and Other Obligations (Indebtedness) (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2021		Dec. 31, 2020
Debt Instrument [Line Items]
Debt and Finance Lease Obligations		$ 19,872		$ 19,280
Less: current maturities of debt and other obligations		159		129
Non-current portion of long-term debt and other long-term obligations		19,713		19,151
2015 Tower Revenue Notes 3.222% due 2042 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount		300
2015 Tower Revenue Notes 3.663% due 2045 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount		700
2018 Tower Revenue Notes 3.720% due 2043 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount		250
2018 Tower Revenue Notes 4.241% due 2048 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount		$ 750
Fixed Rate Securitized Debt July 2018 Tower Revenue Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Increase (Decrease)		5.00%
2016 Revolver [Member] | Bank Debt [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	[1],[2]	1.20%
Finance Lease Obligations and Other [Member] | Securitized Debt [Member]
Debt Instrument [Line Items]
Debt and Finance Lease Obligations	[3]	$ 231		236
High Yield Bonds [Member] | 5.250% Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	[2]	5.30%
Debt and Finance Lease Obligations	[4]	$ 0		1,646
High Yield Bonds [Member] | Senior Unsecured 2016 Notes 4.450% [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	[2]	4.50%
Debt and Finance Lease Obligations		$ 895		894
High Yield Bonds [Member] | 4.000% Senior Unsecured Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	[2]	4.00%
Debt and Finance Lease Obligations		$ 496		496
High Yield Bonds [Member] | 4.750% Senior Unsecured Notes [Member] [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	[2]	4.80%
Debt and Finance Lease Obligations		$ 344		344
High Yield Bonds [Member] | August 2017 Senior Unsecured 3.200% Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	[2]	3.20%
Debt and Finance Lease Obligations		$ 746		745
High Yield Bonds [Member] | June 2020 Senior Unsecured 1.350% Notes [Domain]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	[2]	1.40%
Debt and Finance Lease Obligations		$ 495		494
High Yield Bonds [Member] | August 2017 Senior Unsecured 3.650% Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	[2]	3.70%
Debt and Finance Lease Obligations		$ 994		994
High Yield Bonds [Member] | 3.150% Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	[2]	3.20%
Debt and Finance Lease Obligations		$ 746		746
High Yield Bonds [Member] | 3.800% Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	[2]	3.80%
Debt and Finance Lease Obligations		$ 991		991
High Yield Bonds [Member] | February 2019 Senior Unsecured 4.300% Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	[2]	4.30%
Debt and Finance Lease Obligations		$ 593		593
High Yield Bonds [Member] | February 2019 Senior Unsecured 5.200% Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	[2]	5.20%
Debt and Finance Lease Obligations		$ 395		395
High Yield Bonds [Member] | August 2019 Senior Unsecured 3.100% Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	[2]	3.10%
Debt and Finance Lease Obligations		$ 544		544
High Yield Bonds [Member] | August 2019 Senior Unsecured 4.000% Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	[2]	4.00%
Debt and Finance Lease Obligations		$ 345		345
High Yield Bonds [Member] | April 2020 Senior Unsecured 3.300% Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	[2]	3.30%
Debt and Finance Lease Obligations		$ 737		737
High Yield Bonds [Member] | June 2020 Senior Unsecured 2.250% Notes [Domain]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	[2]	2.30%
Debt and Finance Lease Obligations		$ 1,088		1,088
High Yield Bonds [Member] | April 2020 Senior Unsecured 4.150% Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	[2]	4.20%
Debt and Finance Lease Obligations		$ 489		489
High Yield Bonds [Member] | June 2020 Senior Unsecured 3.250% Notes [Domain]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	[2]	3.30%
Debt and Finance Lease Obligations		$ 889		889
High Yield Bonds [Member] | February 2021 Senior Unsecured 2.100% Notes
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	[2]	2.10%
Debt and Finance Lease Obligations	[4]	$ 987		0
High Yield Bonds [Member] | February 2021 Senior Unsecured 2.900% Notes
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	[2]	2.90%
Debt and Finance Lease Obligations	[4]	$ 1,233		0
High Yield Bonds [Member] | February 2021 Senior Unsecured 1.050% Notes
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	[2]	1.10%
Debt and Finance Lease Obligations	[4]	$ 989		0
High Yield Bonds [Member] | Senior Unsecured 2016 Notes 3.7% [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	[2]	3.70%
Debt and Finance Lease Obligations		$ 745		745
Unsecured Debt [Member]
Debt Instrument [Line Items]
Debt and Finance Lease Obligations		16,598		16,002
Securitized Debt [Member]
Debt Instrument [Line Items]
Debt and Finance Lease Obligations		$ 3,274		3,278
Securitized Debt [Member] | 2015 Tower Revenue Notes 3.222% due 2042 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	[2]	3.20%
Debt and Finance Lease Obligations	[5]	$ 299		299
Securitized Debt [Member] | 2015 Tower Revenue Notes 3.663% due 2045 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	[2]	3.70%
Debt and Finance Lease Obligations	[5]	$ 696		695
Securitized Debt [Member] | 2018 Tower Revenue Notes 3.720% due 2043 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	[2]	3.70%
Debt and Finance Lease Obligations	[5]	$ 249		248
Securitized Debt [Member] | 2018 Tower Revenue Notes 4.241% due 2048 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	[2]	4.20%
Debt and Finance Lease Obligations	[5]	$ 743		743
Securitized Debt [Member] | 3.849% Secured Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	[2]	3.90%
Debt and Finance Lease Obligations		$ 997		997
Securitized Debt [Member] | Fixed Rate Debt 2009 Securitized Notes A-2 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	[2]	9.00%
Debt and Finance Lease Obligations		$ 59		60
Bank Debt [Member] | 2016 Term Loan A [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	[1],[2]	1.20%
Debt and Finance Lease Obligations		$ 1,237	[4]	2,252
Bank Debt [Member] | Commercial Paper [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	[2]	0.40%
Commercial Paper [Member]
Debt Instrument [Line Items]
Commercial Paper - Outstanding		$ 40
Maximum [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		0.75%
Maximum [Member] | Finance Lease Obligations and Other [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		10.00%
Maximum [Member] | Finance Lease Obligations and Other [Member]
Debt Instrument [Line Items]
Debt Instrument Maturity Date Range		25 years
Minimum [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		0.00%
Minimum [Member] | Finance Lease Obligations and Other [Member]
Debt Instrument [Line Items]
Debt Instrument Maturity Date Range		one year
London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		1.75%
London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		0.875%
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt Instrument, Unused Borrowing Capacity, Amount		$ 4,400
Debt and Finance Lease Obligations		$ 580	[6]	290
Revolving Credit Facility [Member] | Maximum [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Commitment Fee Percentage		0.35%
Revolving Credit Facility [Member] | Minimum [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Commitment Fee Percentage		0.125%
Commercial Paper [Member]
Debt Instrument [Line Items]
Debt and Finance Lease Obligations	[7]	$ 40	[4]	$ 285
Commercial Paper - Maximum Available		$ 1,000
Debt Instrument, Maturity Date, Description		397 days

[1] Both the 2016 Revolver and 2016 Term Loan A bear interest, at our option, at either (1) LIBOR plus a credit spread ranging from 0.875% to 1.750% per annum or (2) an alternate base rate plus a credit spread ranging from 0.000% to 0.750% per annum, in each case, with the applicable credit spread based on the Company's senior unsecured debt rating. The Company pays a commitment fee ranging from 0.125% to 0.350%, based on the Company's senior unsecured debt rating, per annum on the undrawn available amount under the 2016 Revolver.

[2] See the 2020 Form 10-K, including note 7, for additional information regarding the maturity and principal amortization provisions and interest rates relating to the Company's indebtedness.

[3] The Company's finance leases and other obligations relate to land, fiber, vehicles, and other assets and bear interest rates ranging up to 10% and mature in periods ranging from less than one year to approximately 25 years.

[4] In February 2021, the Company issued $3.25 billion aggregate principal amount of senior unsecured notes ("February 2021 Senior Notes"), which consisted of (1) $1.0 billion aggregate principal amount of 1.050% senior unsecured notes due July 2026, (2) $1.0 billion aggregate principal amount of 2.100% senior unsecured notes due April 2031 and (3) $1.25 billion aggregate principal amount of 2.900% senior unsecured notes due April 2041. The Company used the net proceeds from the February 2021 Senior Notes offering to (1) redeem all of the outstanding 5.250% Senior Notes, (2) repay a portion of the outstanding Commercial Paper Notes and (3) repay a portion of outstanding borrowings under the 2016 Term Loan A.

[5] If the respective series of Tower Revenue Notes are not paid in full on or prior to an applicable anticipated repayment date, then Excess Cash Flow (as defined in the indenture) of the issuers of such notes will be used to repay principal of the applicable series and class of the Tower Revenue Notes, and additional interest (of an additional approximately 5% per annum) will accrue on the respective Tower Revenue Notes. As of March 31, 2021, the Tower Revenue Notes have principal amounts of $300 million, $250 million, $700 million and $750 million, with anticipated repayment dates in 2022, 2023, 2025 and 2028, respectively.

[6] As of March 31, 2021, the undrawn availability under the 2016 Revolver was $4.4 billion.

[7] Notes under the CP Program may be issued, repaid and re-issued from time to time, with an aggregate principal amount of Commercial Paper Notes outstanding under the CP Program at any time not to exceed $1.0 billion. The net proceeds of the Commercial Paper Notes are expected to be used for general corporate purposes. The maturities of the Commercial Paper Notes, when outstanding, may vary but may not exceed 397 days from the date of issue. The Commercial Paper Notes are issued under customary terms in the commercial paper market and are issued at a discount from par or, alternatively, can be issued at par and bear varying interest rates on a fixed or floating basis. As of March 31, 2021, the Company had net issuances of $40 million under the CP Program. At any point in time, the Company intends to maintain available commitments under its 2016 Revolver in an amount at least equal to the amount of Commercial Paper Notes outstanding. While any outstanding Commercial Paper Notes generally have short-term maturities, the Company classifies the outstanding issuances, when applicable, as long-term based on its ability and intent to refinance the outstanding issuances on a long-term basis.

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Debt and Other Obligations (Components of Interest Expense and Amortization of Deferred Financing Costs) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Debt and Other Obligations [Abstract]
Interest Expense, Debt, Excluding Amortization	$ 167	$ 174
Amortization of deferred financing costs and adjustments on long-term debt	6	5
Capitalized interest	(3)	(4)
Interest expense and amortization of deferred financing costs	$ 170	$ 175

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Debt and Other Obligations Contractual Maturities (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Contractual Obligation, Fiscal Year Maturity Schedule [Abstract]
Long-Term Debt, Maturity, remaining nine months	$ 161
Long-Term Debt, Maturity, Year Two	155
Long-Term Debt, Maturity, Year Three	1,988
Long-Term Debt, Maturity, Year Four	2,187
Long-Term Debt, Maturity, Year Five	525
Long-Term Debt, Maturity, after Year Five	15,032
Total Cash Obligations	20,048
Unamortized Adjustments, Net	(176)
Debt and Finance Lease Obligations	$ 19,872	$ 19,280

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Debt and Other Obligations Extinguishment of Debt (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2021		Mar. 31, 2020
Extinguishment of Debt [Line Items]
Principal amount		$ 1,650
Cash paid	[1]	1,789
Gains (losses) on retirement of long-term obligations		(143)	[2]	$ 0
5.250% Senior Notes [Member]
Extinguishment of Debt [Line Items]
Principal amount		1,650
Cash paid	[1]	1,789
Gains (losses) on retirement of long-term obligations	[2]	$ 143

[1] Exclusive of accrued interest.

[2] Inclusive of the write off of respective deferred financing costs.

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Fair Value Disclosures (Estimated Fair Values and Carrying Amounts of Assets and Liabilities) (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Fair Value Disclosures [Abstract]
Cash and cash equivalents	$ 254	$ 232
Cash and cash equivalents, fair value	254	232
Restricted Cash	184	149
Restricted Cash Fair Value Disclosure		149
Long-term debt and other obligations, carrying amount	19,872	19,280
Long-term debt and other obligations, fair value	$ 20,718	$ 21,302

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Per Share Information (Reconciliation of the Numerators and Denominators of the Basic and Diluted Per Share Computations) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Earnings Per Share [Abstract]
Income (loss) from continuing operations	$ 121	$ 185
Dividends/distributions on preferred stock	0	(28)	[1]
Net income (loss)	58	185
Income (loss) from discontinued operations, net of tax	(63)	0
Net income (loss) attributable to CCIC common stockholders for basic and diluted computations	$ 58	$ 157
Basic weighted-average number of common stock outstanding	432.0	416.0
Effect of assumed dilution from potential issuance of common shares relating to restricted stock units	1.0	2.0
Diluted weighted-average number of common shares outstanding	433.0	418.0
Income (loss) from continuing operations, per share - basic	$ 0.28	$ 0.38
Income (loss) from discontinued operations, per share - basic	(0.15)	0
Net income (loss) attributable to CCIC common stockholders, per share - basic	0.13	0.38
Income (loss) from continuing operations, per share - diluted	0.28	0.38
Income (loss) from discontinued operations, per share - diluted	(0.15)	0
Net income (loss) attributable to CCIC common stockholders, per share - diluted	0.13	0.38
Dividends/distributions declared per share of common stock (in dollars per share)	1.33	1.20
Dividends/distributions declared per share of preferred stock	$ 0	$ 17.1875
Preferred Stock [Member]
Earnings Per Share [Abstract]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount		14.5
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount		14.5

[1] See note 7 for information regarding common and preferred stock dividends declared per share.

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Per Share Information Stock Issued During Period, Restricted Stock Award (Details) shares in Millions	3 Months Ended
	Mar. 31, 2021 shares
Restricted stock units granted [Abstract]
Restricted stock award granted	1

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Commitments and Contingencies Commitment and Contingencies (Details)	Mar. 31, 2021
Subject to Capital Lease with TMO or AT&T [Member]
Other Commitments [Line Items]
Purchase Option, Percentage of Towers	53.00%

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Equity (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions		3 Months Ended
		Mar. 31, 2021	Mar. 31, 2020
Common Stock, Dividends, Per Share, Cash Paid		$ 1.33
Dividends, Common Stock, Cash	[1]	$ 581
Common stock repurchased during period, shares		0.4
Purchases of common stock		$ (67)	$ (73)
Availability Under ATM		$ 750
Common Stock [Member]
Dividends Payable, Date Declared		Feb. 18, 2021
Dividends Payable, Date of Record		Mar. 15, 2021
Dividends Payable, Date to be Paid		Mar. 31, 2021

[1] Inclusive of dividends accrued for holders of unvested restricted stock units, which will be paid when and if the restricted stock units vest.

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Operating Segments Operating Segments Table (Details) $ in Millions		3 Months Ended
		Mar. 31, 2021 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2020 USD ($)
Segment Reporting Information [Line Items]
Tower Count		40,000
Fiber Miles		80,000
Amortization of prepaid lease purchase price adjustments		$ 5
Site Rental		1,369	$ 1,310
Services and other		116	111
Segment Revenues		1,485	1,421
Segment site rental cost of operations	[1]	381	375
Services and other	[1]	81	99
Segment selling, general and administrative expenses		164	175
Stock-based compensation expense		33	37
Depreciation, Amortization and Accretion, Net		408	399
Interest expense and amortization of deferred financing costs		170	175
Income (loss) before income taxes		128	190
Capital expenditures		302	447
Total Assets		38,752		$ 38,768
Segments [Domain]
Segment Reporting Information [Line Items]
Site Rental		1,369	1,310
Services and other		116	111
Segment Revenues		1,485	1,421
Segment site rental cost of operations		373	366
Services and other		79	97
Segment cost of operations	[2],[3]	452	463
Segment site rental gross margin		996	944
Segment services gross margin		37	14
Segment General and Administrative Expenses [Line Items]	[3]	70	75
Segment selling, general and administrative expenses		66	70
Segment Operating Profit		963	883
Stock-based compensation expense		33	36
Depreciation, Amortization and Accretion, Net		408	399
Interest expense and amortization of deferred financing costs		170	175
Other expenses to reconcile to income (loss) from continuing operations before income taxes	[4]	158	13
Income (loss) before income taxes		128	190
Capital expenditures		302	447
Total Assets		38,752	38,616
Segment cost of operations share-based compensation [Member]
Segment Reporting Information [Line Items]
Stock-based compensation expense		5	6
Towers [Member]
Segment Reporting Information [Line Items]
Site Rental		895	867
Services and other		111	108
Segment Revenues		1,006	975
Segment site rental cost of operations		212	214
Services and other		76	95
Segment cost of operations	[2],[3]	288	309
Segment site rental gross margin		683	653
Segment services gross margin		35	13
Segment selling, general and administrative expenses	[3]	25	24
Segment Operating Profit		693	642
Capital expenditures		51	105
Total Assets		22,080	22,234
Fiber [Member]
Segment Reporting Information [Line Items]
Site Rental		474	443
Services and other		5	3
Segment Revenues		479	446
Segment site rental cost of operations		161	152
Services and other		3	2
Segment cost of operations	[2],[3]	164	154
Segment site rental gross margin		313	291
Segment services gross margin		2	1
Segment selling, general and administrative expenses	[3]	45	51
Segment Operating Profit		270	241
Capital expenditures		237	328
Total Assets		15,771	15,520
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Segment selling, general and administrative expenses		66	70
Segment Operating Profit
Stock-based compensation expense		33	36
Depreciation, Amortization and Accretion, Net		408	399
Interest expense and amortization of deferred financing costs		170	175
Other expenses to reconcile to income (loss) from continuing operations before income taxes	[4]	158	13
Capital expenditures		14	14
Total Assets		901	862
Segment G&A share-based compensation [Member]
Segment Reporting Information [Line Items]
Stock-based compensation expense		$ 28	$ 30

[1] Exclusive of depreciation, amortization and accretion shown separately.

[2] Exclusive of depreciation, amortization and accretion shown separately.

[3] Segment cost of operations excludes (1) stock-based compensation of $5 million and $6 million for the three months ended March 31, 2021 and 2020, respectively, and (2) prepaid lease purchase price adjustments of $5 million for both of the three months ended March 31, 2021 and 2020. Selling, general and administrative expenses exclude stock-based compensation expense of $28 million and $30 million for the three months ended March 31, 2021 and 2020, respectively.

[4] See condensed consolidated statement of operations for further information.

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Subsequent Events (Details) $ in Millions, $ in Millions			3 Months Ended		12 Months Ended
	Apr. 26, 2021 USD ($)	Apr. 26, 2021 AUD ($)	Mar. 31, 2021 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2015 USD ($)
Subsequent Event [Line Items]
Net proceeds from sale of subsidiary					$ 1,200
Net gain (loss) from disposal of discontinued operations, net of tax			$ (63)	$ 0	$ 979
ATO Tax Settlement
Subsequent Event [Line Items]
Payments for Taxing Authority Settlements	$ 63	$ 83