v2.4.0.6
Long-Term Incentive Compensation Plans (Unvested Restricted Stock Units) (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Number of Shares      
Unvested RSUs at beginning of period 78    
Granted 54    
Vested (44)    
Canceled (5)    
Unvested RSUs at end of period 83 [1]    
Weighted Average Grant Date Fair Value (Per Share)      
Unvested RSUs at beginning of period $ 28.32    
Granted $ 18.09    
Vested $ 24.64    
Canceled $ 24.74    
Unvested RSUs at end of period $ 23.83 [1]    
Deferred Restricted Stock Units
     
Weighted Average Grant Date Fair Value (Per Share)      
Unvested RSUs that were expected to vest (shares) 73    
Weighted average grant date fair value of unvested RSUs that were expected to vest (per share) $ 24.00    
Aggregate fair value of awards vested $ 753 $ 870 $ 776
[1] Unvested RSUs represent awards where recipients have yet to satisfy either the explicit vesting terms or retirement-eligible requirements. At December 31, 2012, approximately 73 million unvested RSUs with a weighted average grant date fair value of $24.00 were expected to vest.