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Restricted Stock Unit Activity (Detail) (Restricted Stock Units, USD $)
In Millions, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Restricted Stock Units
     
Number of units      
Beginning Balance 13.1 14.0 15.7
Units granted 8.2 5.4 5.3
Units vested (4.2) (5.1) (5.7)
Units forfeited (1.7) (1.2) (1.3)
Ending Balance 15.4 13.1 14.0
Weighted Average Grant-Date Fair Value      
Beginning Balance $ 142.54 $ 95.86 $ 66.75
Units granted $ 209.30 $ 192.82 $ 140.43
Units vested $ 109.67 $ 72.51 $ 60.44
Units forfeited $ 168.20 $ 122.17 $ 82.85
Ending Balance $ 184.29 $ 142.54 $ 95.86