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Stock-Based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2021
Share-based Payment Arrangement [Abstract] |
Weighted Average Assumptions Used | The weighted average assumptions used in the model are as follows:
Expected volatility of stock price |  | 91% |
Risk-free interest rate |  | 0.18% |
Valuation period |  | 3 years |
Dividend yield |  | —% |
Stock Based Compensation Activity | The activity related to RSUs 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) | 240 |  |  | 63.12 |  |  |  |  |
|  | Vested (b) | (575) |  |  | 29.46 |  |  |  |  |
|  | Forfeited | (43) |  |  | 31.37 |  |  |  |  |
| Outstanding and expected to vest at September 30, 2021 (c) | 692 |  |  | $ | 37.93 |  |  | 1.1 |  | $ | 81 |
Performance-based and market-based RSUs |  |  |  |  |  |  |
| Outstanding at January 1, 2021 | 988 |  |  | $ | 32.41 |  |  |  |  |
|  | Granted (a) | 236 |  |  | 62.27 |  |  |  |  |
|  | Vested (b) | — |  |  | — |  |  |  |  |
|  | Forfeited | (324) |  |  | 45.92 |  |  |  |  |
| Outstanding at September 30, 2021 | 900 |  |  | $ | 35.37 |  |  | 1.5 |  | $ | 105 |
| Outstanding and expected to vest at September 30, 2021 (c) | 900 |  |  | $ | 35.37 |  |  | 1.5 |  | $ | 105 |
__________ (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. The weighted-average fair value of time-based RSUs and performance-based and market-based RSUs granted during the nine months ended September 30, 2020 was $23.14 and $21.06, respectively. (b)The total fair value of RSUs vested during the nine months ended September 30, 2021 and 2020 was $17 million and $19 million, respectively. (c)Aggregate unrecognized compensation expense related to time-based RSUs and performance-based and market-based RSUs amounted to $36 million and will be recognized over a weighted average vesting period of 1.3 years.

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