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Stock-Based Compensation - Stock Options Outstanding (Detail) - $ / shares
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]      
Range of Exercise Prices, Lower Range (usd per share) $ 18    
Range of Exercise Prices, Upper Range (usd per share) $ 51    
Options outstanding (shares) 35,735,264    
Options outstanding, Weighted-average remaining contractual life (in years) 3 years 4 months 24 days    
Options outstanding, Weighted-average exercise price (usd per share) $ 33.57    
Options exercisable (shares) 33,703,283 [1] 42,137,574 52,130,525
Options exercisable, Weighted-average exercise price (usd per share) $ 34.27 [1] $ 34.38 $ 34
Range 1      
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]      
Range of Exercise Prices, Lower Range (usd per share) 18    
Range of Exercise Prices, Upper Range (usd per share) $ 31    
Options outstanding (shares) 19,256,469    
Options outstanding, Weighted-average remaining contractual life (in years) 4 years 10 months 24 days    
Options outstanding, Weighted-average exercise price (usd per share) $ 25.78    
Options exercisable (shares) [1] 17,224,488    
Options exercisable, Weighted-average exercise price (usd per share) [1] $ 26.22    
Range 2      
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]      
Range of Exercise Prices, Lower Range (usd per share) 31    
Range of Exercise Prices, Upper Range (usd per share) $ 41    
Options outstanding (shares) 6,044,363    
Options outstanding, Weighted-average remaining contractual life (in years) 1 year    
Options outstanding, Weighted-average exercise price (usd per share) $ 39.73    
Options exercisable (shares) [1] 6,044,363    
Options exercisable, Weighted-average exercise price (usd per share) [1] $ 39.73    
Range 3      
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]      
Range of Exercise Prices, Lower Range (usd per share) 41    
Range of Exercise Prices, Upper Range (usd per share) $ 51    
Options outstanding (shares) 10,434,432    
Options outstanding, Weighted-average remaining contractual life (in years) 2 years    
Options outstanding, Weighted-average exercise price (usd per share) $ 44.38    
Options exercisable (shares) [1] 10,434,432    
Options exercisable, Weighted-average exercise price (usd per share) [1] $ 44.38    
[1] At Dec. 31, 2014 and 2013, 42,137,574 and 52,130,525 options were exercisable at an average price per common share of $34.38 and $34, respectively.