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Changes in Outstanding Options and Weighed-Average Exercise Price Per Share (Detail)

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Changes in Outstanding Options and Weighed-Average Exercise Price Per Share (Detail) (USD $)
In Millions, except Share data in Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Shares      
Outstanding at the beginning of the year 6,715 6,526 6,845
Granted (all at market price) 501 1,298 1,216
Exercised (2,352) (947) (1,358)
Forfeited and cancelled (116) (162) (177)
Outstanding at the end of the year 4,748 6,715 6,526
Vested and expected to vest at end of year 4,563    
Exercisable at end of year 3,061 4,289 4,248
Weighted-Average Exercise Price      
Outstanding at the beginning of the year $ 31.82 $ 30.63 $ 28.68
Granted (all at market price) $ 47.04 $ 32.94 $ 32.02
Exercised $ 29.37 $ 25.02 $ 21.58
Forfeited and cancelled $ 31.85 $ 32.99 $ 34.04
Outstanding at the end of the year $ 34.64 $ 31.82 $ 30.63
Vested and expected to vest at end of year $ 34.58    
Exercisable at end of year $ 33.34 $ 31.71 $ 30.28
Weighted-Average Remaining Contractual Term      
Outstanding at the end of the year 6 years 6 months    
Vested and expected to vest at end of year 6 years 4 months 24 days    
Exercisable at end of year 5 years 3 months 18 days    
Aggregate Intrinsic Value      
Outstanding at the end of the year $ 92.5    
Vested and expected to vest at end of year 89.2    
Exercisable at end of year $ 63.6