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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2023
Share-Based Payment Arrangement [Abstract] |
Schedule of Weighted Average Assumptions Used | During the years ended December 31, 2023 and 2022, we did not issue any stock unit awards containing a market condition.
Expected volatility of stock price |  | 91% |
Risk-free interest rate |  | 0.18% |
Valuation period |  | 3 years |
Dividend yield |  | —% |
Schedule of Stock Based Compensation Activity | Annual activity related to stock units consisted of (in thousands of shares):
|  |  | Number of Shares |  | Weighted Average Grant Date Fair Value |  | Weighted Average Remaining Contractual Term (years) |  | Aggregate Intrinsic Value (in millions)
Time-based RSUs |  |  |  |  |  |  |
| Outstanding at January 1, 2023 | 451 |  |  | $ | 92.06 |  |  |  |  |
|  | Granted (a) | 98 |  |  | 204.17 |  |  |  |  |
|  | Vested (b) | (252) |  |  | 53.44 |  |  |  |  |
|  | Forfeited | (7) |  |  | 165.67 |  |  |  |  |
| Outstanding and expected to vest at December 31, 2023 (c) | 290 |  |  | $ | 161.87 |  |  | 1.2 |  | $ | 51 |
Performance-based and market-based RSUs |  |  |  |  |  |  |
| Outstanding at January 1, 2023 | 691 |  |  | $ | 57.56 |  |  |  |  |
|  | Granted (a) | 111 |  |  | 204.13 |  |  |  |  |
|  | Vested (b) | (381) |  |  | 21.05 |  |  |  |  |
|  | Forfeited | (10) |  |  | 148.96 |  |  |  |  |
| Outstanding at December 31, 2023 | 411 |  |  | $ | 128.77 |  |  | 0.9 |  | $ | 73 |
| Outstanding and expected to vest at December 31, 2023 (c) | 333 |  |  | $ | 112.18 |  |  | 0.9 |  | $ | 59 |
__________ (a)Reflects the maximum number of stock units assuming achievement of all performance-, market- and time-vesting criteria and does not include those for non-employee directors, which are discussed separately below. The weighted-average fair value of time-based RSUs, and performance-based and market-based RSUs granted in 2022 was $172.34 and $193.48, respectively, and the weighted-average fair value of time-based RSUs and performance-based RSUs granted in 2021 was $65.23 and $62.27, respectively. (b)The total fair value of RSUs vested during 2023, 2022 and 2021 was $21 million, $22 million and $17 million, respectively. (c)Aggregate unrecognized compensation expense related to time-based RSUs and performance-based and market-based RSUs amounted to $45 million and will be recognized over a weighted average vesting period of 1.0 year.

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