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Long-Term Incentive Compensation Plans (Performance-based 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
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Fair value of equity instruments other than options (per share) $ 18.09    
Stock-based Compensation Awards Roll Forward      
Awards at beginning of period 111    
Granted 54    
Awards at end of period 122 [1]    
Performance-based Stock Units
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Fair value of equity instruments other than options (per share) $ 20.42 $ 43.14 $ 41.52
Fair Value Assumptions      
Risk-free interest rate 0.40% 1.00% 1.50%
Expected stock price volatility 56.00% 89.00% 89.90%
Expected dividend yield 1.10% 1.50% 0.70%
Stock-based Compensation Awards Roll Forward      
Awards at beginning of period 4    
Granted 1    
Awards at end of period 5 4  
Performance-based Stock Units | Average ROE
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Fair value of equity instruments other than options (per share) $ 18.16 $ 29.89 $ 29.32
Performance-based Stock Units | Average ROE, Less than 6%
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Multiplier 0.0    
Performance-based Stock Units | Average ROE, 12% or More
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Multiplier 1.5    
Performance-based Stock Units | Average ROE, Less than 7.5%
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Multiplier   0.0 0.0
Performance-based Stock Units | Average ROE, 18% or More
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Multiplier   2.0 2.0
Performance-based Stock Units | TSR, Below | Minimum
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Multiplier 0.0    
Performance-based Stock Units | TSR, Above | Maximum
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Multiplier 1.5    
Performance-based Stock Units | TSR, Rank 1
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Multiplier   2.0 2.0
Performance-based Stock Units | TSR, Rank 9 or 10
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Multiplier   0.0 0.0
[1] At December 31, 2012, approximately 112 million RSUs with a weighted average grant date fair value of $24.44 were vested or expected to vest.