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Stock-based Compensation (Tables)

12 Months Ended

Dec. 31, 2021

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, 2021.

			RSUs
			(In millions)
Outstanding at the beginning of year			2
Granted			1
Vested			(1)
Forfeited			—
Outstanding at end of year			2

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, 2021, 2020 and 2019. 

			Years Ended December 31,
			2021						2020						2019
Risk-free rate			0.2		%				1.4		%				2.5		%
Expected volatility			30		%				19		%				18		%
Expected dividend rate			3.4		%				3.5		%				4.0		%

Summary of Restricted Stock Vested

The following table is a summary of the RSUs vested during the years ended December 31, 2021, 2020 and 2019.

Years Ended December 31,						Total Shares Vested						Fair Value on Vesting Date
						(In millions of shares)
2021						1						$	199
2020						1						220
2019						1						135

Stock Based Compensation Expense

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

			Years Ended December 31,
			2021						2020						2019
Stock-based compensation expense:
Site rental costs of operations			$	14					$	16					$	19
Services and other costs of operations			8						8						7
Selling, general and administrative expenses			109						109						90
Total stock-based compensation			$	131					$	133					$	116

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901

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