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Stock-Based Compensation (Tables)
 12 Months Ended
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 SharesWeighted
Average
Grant Date
Fair Value		Weighted Average Remaining Contractual Term (years)Aggregate Intrinsic Value (in millions)
Time-based RSUs
Outstanding at January 1, 2020847 $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, 20201,061 $38.89 
Granted (a)
552 21.06 
Vested (b)
(73)36.64 
Forfeited(552)32.97 
Outstanding at December 31, 2020988 $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.