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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2020
Share-based Payment Arrangement [Abstract] |
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, 2020 | 847 |  |  | $ | 36.99 |  |  |  |  |
|  | Granted (a) | 798 |  |  | 23.14 |  |  |  |  |
|  | Vested (b) | (435) |  |  | 37.13 |  |  |  |  |
|  | Forfeited | (140) |  |  | 30.36 |  |  |  |  |
| Outstanding and expected to vest at December 31, 2020 (c) | 1,070 |  |  | $ | 27.47 |  |  | 0.9 |  | $ | 40 |
Performance-based and market-based RSUs |  |  |  |  |  |  |
| Outstanding at January 1, 2020 | 1,061 |  |  | $ | 38.89 |  |  |  |  |
|  | Granted (a) | 552 |  |  | 21.06 |  |  |  |  |
|  | Vested (b) | (73) |  |  | 36.64 |  |  |  |  |
|  | Forfeited | (552) |  |  | 32.97 |  |  |  |  |
| Outstanding at December 31, 2020 | 988 |  |  | $ | 32.41 |  |  | 1.4 |  | $ | 37 |
| Outstanding and expected to vest at December 31, 2020 (c) | 38 |  |  | $ | 20.70 |  |  | 2.5 |  | $ | 1 |
__________ (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 RSUs granted in 2019 was $34.14 and $34.56, respectively, and the weighted-average fair value of time-based RSUs and performance-based RSUs granted in 2018 was $48.41 and $48.52, respectively. (b)The total fair value of RSUs vested during 2020, 2019 and 2018 was $19 million, $18 million and $20 million, respectively. (c)Aggregate unrecognized compensation expense related to time-based RSUs and performance-based and market-based RSUs amounted to $17 million and will be recognized over a weighted average vesting period of 1.0 years.
Summary of Share Based Compensation Shares Authorized Under Stock Option Plans by Exercise Price Range | Stock options exercised during 2019 and 2018 had intrinsic values of $1 million and $8 million, respectively.

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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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- Definition Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms. + 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 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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