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Share-Based Compensation Plans (Details) (USD $)
In Millions, except Share data in Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award        
Share-based compensation expense $ 69 $ 55    
Restricted stock units (“RSUs”)
       
Share-based Compensation Arrangement by Share-based Payment Award        
Share-based compensation expense 55 49    
Non-vested share awards        
Non-vested at beginning of period (in shares) 10,432 9,916 9,916  
Granted (in shares) 1,764 2,278    
Vested (in shares) (2,080) (2,022)    
Forfeited (in shares) (128) (179)    
Non-vested at end of period (in shares) 9,988 9,993    
Weighted Average Fair value        
Non-vested at beginning of period (in dollars per share) $ 44 [1] $ 42 [1] $ 42 [1]  
Granted (in dollars per share) $ 60 [1] $ 47 [1]    
Vested (in dollars per share) $ 46 [1] $ 43 [1]    
Forfeited (in dollars per share) $ 44 [1] $ 44 [1]    
Non-vested at end of period (in dollars per share) $ 47 [1] $ 43 [1]    
Target PSAs granted 1,764 2,278    
Fair value $ 60 [1] $ 47 [1]    
Performance share awards (“PSAs”)
       
Share-based Compensation Arrangement by Share-based Payment Award        
Share-based compensation expense 11 2    
Non-vested share awards        
Granted (in shares) 1,135   1,369 1,715
Weighted Average Fair value        
Granted (in dollars per share) $ 58 [2]   $ 47 [2] $ 50 [2]
Target PSAs granted 1,135   1,369 1,715
Fair value $ 58 [2]   $ 47 [2] $ 50 [2]
Number of shares that would be issued based on current performance levels 1,135   1,720 1,118
Unamortized expense, based on current performance levels 65   51 15
Stock options
       
Share-based Compensation Arrangement by Share-based Payment Award        
Share-based compensation expense 1 2    
Employee stock purchase plans
       
Share-based Compensation Arrangement by Share-based Payment Award        
Share-based compensation expense $ 2 $ 2    
Minimum | Performance share awards (“PSAs”)
       
Weighted Average Fair value        
Vesting conditions period 1 year      
Percent of shares issued 0.00%      
Maximum [Member] | Performance share awards (“PSAs”)
       
Weighted Average Fair value        
Vesting conditions period 5 years      
Percent of shares issued 200.00%      
[1] Represents per share weighted average fair value of award at date of grant
[2] Represents per share weighted average fair value of award at date of grant.