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Stock-Based Compensation (Stock Based Compensation Activity) (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2021
Jun. 30, 2020
Number of Shares      
Balance (in shares) 816 816  
Weighted Average Grant Date Fair Value      
Fair value vested in period   $ 13 $ 18
Cost not yet recognized $ 40 $ 40  
Period for recognition 1 year 4 months 24 days    
Time-based RSUs      
Number of Shares      
Balance (in shares)   1,070  
Granted (in shares) 240    
Vested (in shares) (459)    
Canceled (in shares) (35)    
Outstanding and expected to vest (in shares) 816 816  
Weighted Average Grant Date Fair Value      
Balance (in dollars per share)   $ 27.47  
Granted (in dollars per share) $ 63.12   $ 21.67
Vested (in dollars per share) 28.78    
Canceled (in dollars per share) 32.97    
Balance (in dollars per share) 36.98 36.98  
Outstanding and expected to vest, weighted average grant date fair value (in dollars per share) $ 36.98 $ 36.98  
Outstanding and expected to vest weighted average remaining contractual term (in years) 1 year 2 months 12 days    
Aggregate intrinsic value, outstanding and expected to vest $ 64 $ 64  
Performance-based and market-based RSUs      
Number of Shares      
Balance (in shares)   988  
Granted (in shares) 236    
Vested (in shares) 0    
Canceled (in shares) (316)    
Balance (in shares) 908 908  
Outstanding and expected to vest (in shares) 563 563  
Weighted Average Grant Date Fair Value      
Balance (in dollars per share)   $ 32.41  
Granted (in dollars per share) $ 62.27   $ 21.06
Vested (in dollars per share) 0    
Canceled (in dollars per share) 46.59    
Balance (in dollars per share) 35.23 35.23  
Outstanding and expected to vest, weighted average grant date fair value (in dollars per share) $ 40.63 $ 40.63  
Outstanding and expected to vest weighted average remaining contractual term (in years) 1 year 9 months 18 days    
Outstanding weighted average remaining contractual terms (in years) 1 year 9 months 18 days    
Aggregate intrinsic value outstanding $ 71 $ 71  
Aggregate intrinsic value, outstanding and expected to vest $ 44 $ 44