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Restricted Stock Units Activity (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Summary of stock options  
Compensation expense not yet recognized related to non-vested RSU's $ 96
Weighted average period for total compensation expense not yet recognized 2.2
Excess tax benefit for restricted stock units and other equity-based compensation $ 18
Number of Restricted Stock Units
 
Summary of stock options  
Non-vested at January 1 4.8
Granted 1.5
Vested (2.7)
Forfeited (0.2)
Non-vested at December 31 3.4
Estimate of Fair Value, Fair Value Disclosure [Member]
 
Summary of stock options  
Non-vested at January 1 $ 33.02
Granted $ 49.41
Vested $ 25.91
Forfeited $ 40.41
Non-vested at December 31 $ 42.47