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Summary of Stock Option and Restricted Stock Activity (Detail) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Stock Options Shares          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 3,253,793 5,218,258 7,727,757 10,929,371  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 0 0 0    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period (417,210) (1,821,667) (2,774,725)    
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Exercisable Options 3,253,793        
Stock Options Price Range          
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit $ 9.06 $ 9.06 $ 9.06 $ 9.06  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit 85.34 85.34 150.45 150.45  
Share Based Compensation Shares Authorized Under Stock Option Plans Grants in Period Exercise Price Range Lower Range Limit 0.00 0.00 0.00    
Share Based Compensation Shares Authorized Under Stock Option Plans Grants in Period Exercise Price Range Upper Range Limit 0.00 0.00 0.00    
Share Based Compensation Shares Authorized Under Stock Option Plans Vested in Period Exercise Price Range Lower Range Limit 9.06 9.06 9.06    
Share Based Compensation Shares Authorized Under Stock Option Plans Vested in Period Exercise Price Range Upper Range Limit 32.27 32.27 32.27    
Share Based Compensation Shares Authorized Under Stock Option Plans Forfeitures and Expirations in Period Exercise Price Range Lower Range Limit 21.67 23.70 23.70    
Share Based Compensation Shares Authorized Under Stock Option Plans Forfeitures and Expirations in Period Exercise Price Range Upper Range Limit 71.03 150.45 149.81    
Stock Options Weighted Average Exercise Price          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price 42.54 36.75 43.84 $ 49.86  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price 0.00 0.00 0.00    
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price 16.25 20.38 20.86    
Share-based Compensation Arrangements by Share-based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price 67.59 $ 73.01 $ 71.10    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price $ 42.54        
Restricted Stock Shares          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period         574,257
Restricted Stock Weighted Average Grant Price          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Number of Shares (1,547,255) (687,832) (426,889)    
Restricted Stock [Member]          
Restricted Stock Shares          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 11,312 1,334,075 2,929,859 3,983,538  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 11,312 20,412 21,427    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period (1,332,995) (1,510,045) (957,308)    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period (1,080) (106,151) (117,798)    
Restricted Stock Deferred Compensation          
Deferred Compensation Arrangement with Individual, Recorded Liability $ 0 $ 2 $ 21 $ 50  
Deferred Compensation Arrangement, Grants in Period 1 1 0    
Deferred Compensation Arrangement, Vested 0 0 0    
Deferred Compensation Arrangement, Forfeitures and Expirations in Period (1) (4) (2)    
Deferred Compensation Arrangement, Amortization $ (2) $ (16) $ (27)    
Restricted Stock Weighted Average Grant Price          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value $ 42.44 $ 30.44 $ 26.45 $ 27.04  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value 42.44 41.15 39.20    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value 30.43 22.86 29.31    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value $ 35.03 $ 29.95 $ 25.60    
Restricted Stock Units (RSUs) [Member]          
Restricted Stock Shares          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 4,175,809 4,318,840 3,689,264 2,496,178  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 2,548,326 1,670,587 1,590,075    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period (2,428,213) (883,621) (338,196)    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period (263,144) (157,390) (58,793)    
Restricted Stock Weighted Average Grant Price          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value $ 36.27 $ 35.44 $ 31.15 $ 26.69  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value 35.08 40.54 36.67    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value 30.52 26.39 32.80    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value $ 36.67 $ 39.19 $ 37.73