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Share-Based Compensation - General (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Share-based Arrangements with Employees and Nonemployees [Abstract]      
Shares available for future issuance under active share-based compensation plans 26    
Shares authorized for awards under active share-based compensation plans 31    
Excess tax benefits related to share-based compensation included in cash flows from financing activities $ 11 $ 51 $ (15)
Cash received from stock option exercises $ 135 $ 52 $ 45