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Stock-Based Compensation (Restricted Stock And RSU Activity) (Detail) (USD $)
9 Months Ended
Sep. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Restricted Stock and Units, beginning of period 5,528,781
Granted, Restricted Stock and Units 2,481,052
Converted, Restricted Stock and Units (1,616,091)
Forfeited, Restricted Stock and Units (145,874)
Restricted Stock and Units, end of period 6,247,868 [1]
Weighted Average Grant Date Fair Value, beginning of period $ 196.44
Granted, Weighted-Average Grant Date Fair Value $ 166.43
Converted, Weighted-Average Grant Date Fair Value $ 175.84
Forfeited, Weighted-Average Grant Date Fair Value $ 177.41
Weighted-Average Grant Date Fair Value, end of period $ 190.31 [1]
[1] At September 30, 2012, approximately 5.6 million awards are expected to vest and 0.6 million awards have vested but have not been converted.