v2.4.0.8
Restricted Stock Units and Awards Activity (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Equity-based compensation  
Compensation expense not yet recognized related to non-vested RSUs and RSAs $ 111
Weighted average period for total compensation expense not yet recognized 2.2
Excess tax benefit for equity-based compensation $ 10
Number of Restricted Stock Units and Awards
 
Equity-based compensation  
Non-vested at January 1 3.4
Granted 1.5
Vested (1.3)
Forfeited (0.2)
Non-vested at December 31 3.4
Weighted-average fair value per unit and award
 
Equity-based compensation  
Non-vested at January 1 $ 42.47
Granted $ 57.75
Vested $ 37.71
Forfeited $ 50.70
Non-vested at December 31 $ 51.37