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Restricted Stock Unit Activity (Detail) (Restricted Stock Units, USD $)
In Millions, except Per Share data, unless otherwise specified
6 Months Ended
Jun. 30, 2013
Restricted Stock Units
 
Number of units  
Beginning Balance 15.4
Units granted 4.7
Units vested (2.3)
Units forfeited (0.9)
Ending Balance 16.9
Weighted Average Grant-Date Fair Value  
Beginning Balance $ 184
Units granted $ 260
Units vested $ 152
Units forfeited $ 201
Ending Balance $ 209