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Stock-based Compensation (Tables)

12 Months Ended

Dec. 31, 2024

Share-Based Payment Arrangement, Noncash Expense [Abstract]

Summary of Restricted Stock Awards Activity

The following is a summary of the RSU activity during the year ended December 31, 2024.

			RSUs
			(In millions)
Outstanding at the beginning of year			3
Granted			1
Vested			(1)
Forfeited			—
Outstanding at end of year			3

Summary of the Assumptions Used in the Monte Carlo Simulation to Determine the Grant-Date Fair Value

The following table summarizes the assumptions used in the Monte Carlo simulation to determine the grant-date fair value for the RSUs with market conditions granted during the years ended December 31, 2024, 2023 and 2022. 

			Years Ended December 31,
			2024						2023						2022
Risk-free rate			4.4		%				4.5		%				1.7		%
Expected volatility			27		%				27		%				31		%
Expected dividend rate			5.5		%				4.6		%				3.0		%

Summary of Restricted Stock Vested

The following table is a summary of the RSUs vested during the years ended December 31, 2024, 2023 and 2022.

Years Ended December 31,						Total Shares Vested						Fair Value on Vesting Date
						(In millions of shares)
2024						1						$	102
2023						1						92
2022						1						187

Stock Based Compensation Expense

The following table discloses the components of stock-based compensation expense, net.

			Years Ended December 31,
			2024						2023						2022
Stock-based compensation expense, net:
Site rental costs of operations			$	19					$	19					$	18
Services and other costs of operations			6						10						10
Selling, general and administrative expenses			106						128						128
Total stock-based compensation expense, net			$	131					$	157					$	156

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Summary of the Assumptions Used in the Monte Carlo Simulation to Determine the Grant-Date Fair Value

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-SubTopic 10
-Topic 718
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480429/718-10-50-1

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-Publisher FASB
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