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Restricted Stock Unit Activity (Detail) (Restricted Stock Units, USD $)
In Millions, except Per Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Restricted Stock Units
 
Number of units  
Beginning Balance 15.4
Units granted 0.9
Units vested (0.7)
Units forfeited (0.5)
Ending Balance 15.1
Weighted Average Grant-Date Fair Value  
Beginning Balance $ 184
Units granted $ 263
Units vested $ 115
Units forfeited $ 193
Ending Balance $ 192