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Employee Stock-based Compensation Plans - Summary of Stock Option Activity (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Shares Under Option    
Outstanding at beginning of period (in shares) 5,373  
Granted (in shares) 0  
Exercised (in shares) (885)  
Canceled (in shares) (207)  
Forfeited (in shares) (133)  
Outstanding at end of period (in shares) 4,148 5,373
Fully vested and expected to vest at period end (in shares) 4,148  
Exercisable at period end (in shares) 3,608  
Weighted- Average Exercise Price per Share    
Outstanding at beginning of period (in usd per share) $ 37.63  
Granted (in usd per share) 0.00  
Exercised (in usd per share) 23.69  
Canceled (in usd per share) 47.79  
Forfeited (in usd per share) 30.12  
Outstanding at end of period (in usd per share) 40.34 $ 37.63
Fully vested and expected to vest at period end (in usd per share) 40.34  
Exercisable at period end (in usd per share) $ 42.05  
Weighted- Average Remaining Contractual Term (in years)    
Weighted-average remaining contractual term (in years) 3 years 9 months 4 years 6 months
Fully vested and expected to vest at period end (in years) 3 years 9 months  
Exercisable at period end (in years) 3 years 2 months  
Aggregate Intrinsic Value (in millions)    
Aggregate Intrinsic Value $ 15 $ 30
Fully vested and expected to vest at period end 15  
Exercisable at period end $ 10