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Stock Compensation Plans (Details) (USD $)
In Millions, except Share data in Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Share-based Compensation Arrangement by Share-based Payment Award      
Stock-based compensation expense, net of tax $ 235 $ 221 $ 209
Tax benefit 77 75 68
Stock-based compensation expense, net of tax 158 146 141
Non-vested stock awards      
Shares issued 500 2,200 1,000
Restricted Stock Units ("RSUs")
     
Share-based Compensation Arrangement by Share-based Payment Award      
Stock-based compensation expense, net of tax 142 138 124
Vesting period, minimum (in years) P3Y    
Vesting period, maximum (in years) P5Y    
Vesting period from grant date of award (in years) 10 years    
Non-vested stock awards      
Non-vested at beginning of period (in shares) 10,674 12,850 14,060
Granted (in shares) 3,506 3,817 3,786
Vested (in shares) (3,773) (5,278) (4,330)
Forfeited (in shares) (491) (715) (666)
Non-vested at end of period (in shares) 9,916 10,674 12,850
Weighted Average Fair value      
Non-vested at beginning of period (in dollars per share) $ 38 $ 36 $ 35
Granted (in dollars per share) $ 51 $ 40 $ 38
Vested (in dollars per share) $ 39 $ 35 $ 33
Forfeited (in dollars per share) $ 39 $ 35 $ 37
Non-vested at end of period (in dollars per share) $ 42 $ 38 $ 36
Fair value of awards vested during the period 217 235 223
Performance-based Awards
     
Share-based Compensation Arrangement by Share-based Payment Award      
Stock-based compensation expense, net of tax 78 62 60
Vesting period, minimum (in years) P1Y    
Vesting period, maximum (in years) P5Y    
Percentage of number of units granted, low end of the range 0.00%    
Percentage of number of units granted, high end of the range 200.00%    
Non-vested stock awards      
Granted (in shares) 1,715 1,390 3,754
Weighted Average Fair value      
Granted (in dollars per share) $ 50 $ 39 $ 38
Number of shares that would be issued based on current performance levels 1,772 1,397 2,300
Unamortized expense, based on current performance levels 60 18 4
Stock options
     
Share-based Compensation Arrangement by Share-based Payment Award      
Stock-based compensation expense, net of tax 9 17 21
Vesting period, minimum (in years) P4Y    
2008 Leadership Performance Plan ("LPP") cycle | Performance-based Awards
     
Non-vested stock awards      
Shares issued 1,200    
2007 Leadership Performance Plan ("LPP") cycle | Performance-based Awards
     
Non-vested stock awards      
Shares issued   1,600  
2006 performance plan | Performance-based Awards
     
Non-vested stock awards      
Shares issued 300    
Other Performance Plans | Performance-based Awards
     
Non-vested stock awards      
Shares issued   84  
Employee stock purchase plans
     
Share-based Compensation Arrangement by Share-based Payment Award      
Stock-based compensation expense, net of tax $ 6 $ 4 $ 4