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Restricted Stock Units Activity (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Summary of stock options      
Compensation expense not yet recognized related to non-vested RSU $ 90    
Weighted average period for total compensation expense not yet recognized 2.9    
Excess tax benefit for restricted stock units and other equity-based compensation $ 24    
Non-vested at January 1 $ 14.56 $ 8.98 $ 5.14
Non-vested at December 31 $ 14.56 $ 8.98 $ 5.14
Number of Restricted Stock Units
     
Summary of stock options      
Non-vested at January 1 5.2    
Granted 1.1    
Vested (1.3)    
Forfeited (0.2)    
Non-vested at December 31 4.8    
Weighted-average fair value per award [Member]
     
Summary of stock options      
Non-vested at January 1 $ 33.02 $ 26.48  
Granted $ 53.53    
Vested $ 25.92    
Forfeited $ 30.83    
Non-vested at December 31 $ 33.02 $ 26.48