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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, 2015
Dec. 31, 2014
Shares Under Option    
Outstanding at beginning of period (in shares) 7,237  
Granted (in shares) 1,185  
Exercised (in shares) (428)  
Canceled (in shares) (134)  
Forfeited (in shares) (286)  
Outstanding at end of period (in shares) 7,574 7,237
Fully vested and expected to vest at period end (in shares) 7,476  
Exercisable at period end (in shares) 5,299  
Weighted-Average Exercise Price per Share    
Outstanding at beginning of period (in usd per share) $ 35.50  
Granted (in usd per share) 30.63  
Exercised (in usd per share) 20.66  
Canceled (in usd per share) 46.18  
Forfeited (in usd per share) 48.12  
Outstanding at end of period (in usd per share) 34.91 $ 35.50
Fully vested and expected to vest at period end (in usd per share) 34.89  
Exercisable at period end (in usd per share) $ 33.43  
Weighted-Average Remaining Contractual Term    
Weighted-average remaining contractual term (in years) 5 years 8 months 12 days 6 years 1 month 6 days
Fully vested and expected to vest at period end (in years) 5 years 7 months 6 days  
Exercisable at period end (in years) 4 years 2 months 12 days  
Aggregate Intrinsic Value    
Aggregate Intrinsic Value $ 20 $ 78
Fully vested and expected to vest at period end 20  
Exercisable at period end $ 20