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Stock-Based Compensation (Stock Based Compensation Activity) (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Number of Shares    
Balance (in shares) 472  
Weighted Average Grant Date Fair Value    
Cost not yet recognized $ 55  
Period for recognition 1 year 4 months 24 days  
Time-based RSUs    
Number of Shares    
Balance (in shares) 671  
Granted (in shares) 67  
Vested (in shares) (260)  
Canceled (in shares) (6)  
Outstanding and expected to vest (in shares) 472  
Weighted Average Grant Date Fair Value    
Balance (in usd per share) $ 39.39  
Granted (in usd per share) 194.74 $ 63.12
Vested (in usd per share) 34.00  
Canceled (in usd per share) 36.03  
Balance (in usd per share) 64.49  
Outstanding and expected to vest, weighted average grant date fair value (in usd per share) $ 64.49  
Outstanding and expected to vest weighted average remaining contractual term (in years) 1 year 1 month 6 days  
Aggregate intrinsic value, outstanding and expected to vest $ 124  
Fair value vested in period $ 15 $ 11
Performance-based and market-based RSUs    
Number of Shares    
Balance (in shares) 886  
Granted (in shares) 96  
Vested (in shares) (163)  
Canceled (in shares) (15)  
Balance (in shares) 804  
Outstanding and expected to vest (in shares) 796  
Weighted Average Grant Date Fair Value    
Balance (in usd per share) $ 35.40  
Granted (in usd per share) 194.74 $ 62.27
Vested (in usd per share) 34.82  
Canceled (in usd per share) 32.42  
Balance (in usd per share) 54.58  
Outstanding and expected to vest, weighted average grant date fair value (in usd per share) $ 53.17  
Outstanding and expected to vest weighted average remaining contractual term (in years) 1 year 6 months  
Outstanding weighted average remaining contractual terms (in years) 1 year 6 months  
Aggregate intrinsic value outstanding $ 212  
Aggregate intrinsic value, outstanding and expected to vest $ 210