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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2021
Share-based Payment Arrangement [Abstract] |
Weighted Average Assumptions Used | During the years ended December 31, 2021 and 2019, 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 |  | —% |
Annual Activity of RSUs | 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, 2021 | 1,070 |  |  | $ | 27.47 |  |  |  |  |
|  | Granted (a) | 245 |  |  | 65.23 |  |  |  |  |
|  | Vested (b) | (590) |  |  | 29.16 |  |  |  |  |
|  | Forfeited | (54) |  |  | 31.82 |  |  |  |  |
| Outstanding and expected to vest at December 31, 2021 (c) | 671 |  |  | $ | 39.39 |  |  | 0.9 |  | $ | 139 |
Performance-based and market-based RSUs |  |  |  |  |  |  |
| Outstanding at January 1, 2021 | 988 |  |  | $ | 32.41 |  |  |  |  |
|  | Granted (a) | 236 |  |  | 62.27 |  |  |  |  |
|  | Vested (b) | — |  |  | — |  |  |  |  |
|  | Forfeited | (338) |  |  | 45.39 |  |  |  |  |
| Outstanding at December 31, 2021 | 886 |  |  | $ | 35.40 |  |  | 1.3 |  | $ | 184 |
| Outstanding and expected to vest at December 31, 2021 (c) | 886 |  |  | $ | 35.40 |  |  | 1.3 |  | $ | 184 |
__________ (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 2020 was $23.14 and $21.06, respectively, and the weighted-average fair value of time-based RSUs and performance-based RSUs granted in 2019 was $34.14 and $34.56, respectively. (b)The total fair value of RSUs vested during 2021, 2020 and 2019 was $17 million, $19 million and $18 million, respectively. (c)Aggregate unrecognized compensation expense related to time-based RSUs and performance-based and market-based RSUs amounted t o $31 million a nd will be recognized over a weighted average vesting period o f 1.1 yea rs.

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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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