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Stock-based Compensation (Tables) | 12 Months Ended
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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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