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Schedule of Stock Repurchase Activities (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Stockholders' Equity        
Shares repurchased 0.5 0.1 0.8 0.1
Average price per share $ 493.49 $ 523.06 $ 491.28 $ 523.06
Value of shares repurchased $ 269.6 $ 15.2 $ 415.4 $ 15.2