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Share-Based Compensation Plans (Details) (USD $)
In Millions, except 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      
Share-based compensation expense $ 212 $ 235 $ 221
Tax benefit 62 77 75
Share based compensation expense, net of tax 150 158 146
Employee share purchase plans
     
Share-based Compensation Arrangement by Share-based Payment Award      
Share-based compensation expense 7 6 4
Restricted share units ("RSUs")
     
Share-based Compensation Arrangement by Share-based Payment Award      
Share-based compensation expense 154 142 138
Non-vested share awards      
Non-vested at beginning of period (in shares) 9,916,000 10,674,000 12,850,000
Granted (in shares) 5,113,000 3,506,000 3,817,000
Vested (in shares) (3,958,000) (3,773,000) (5,278,000)
Forfeited (in shares) (639,000) (491,000) (715,000)
Non-vested at end of period (in shares) 10,432,000 9,916,000 10,674,000
Weighted Average Fair value      
Non-vested at beginning of period (in dollars per share) $ 42 $ 38 $ 36
Granted (in dollars per share) $ 46 $ 51 $ 40
Vested (in dollars per share) $ 42 $ 39 $ 35
Forfeited (in dollars per share) $ 44 $ 39 $ 35
Non-vested at end of period (in dollars per share) $ 44 $ 42 $ 38
Fair value of RSUs vested during the period 180 146 174
Restricted share units ("RSUs") | Minimum
     
Share-based Compensation Arrangement by Share-based Payment Award      
Vesting period 3 years    
Restricted share units ("RSUs") | Maximum
     
Share-based Compensation Arrangement by Share-based Payment Award      
Vesting period 5 years    
Vesting period from grant date of award 10 years    
Performance-based Awards
     
Share-based Compensation Arrangement by Share-based Payment Award      
Share-based compensation expense 46 78 62
Non-vested share awards      
Granted (in shares) 1,369,000 1,715,000 1,390,000
Weighted Average Fair value      
Granted (in dollars per share) $ 47 $ 50 $ 39
Number of shares that would be issued based on current performance levels 1,722,000 1,120,000 1,079,000
Unamortized expense, based on current 63 19  
Performance-based Awards | Minimum
     
Share-based Compensation Arrangement by Share-based Payment Award      
Vesting period 1 year    
Weighted Average Fair value      
Percentage of number of units granted 0.00%    
Performance-based Awards | Maximum
     
Share-based Compensation Arrangement by Share-based Payment Award      
Vesting period 5 years    
Weighted Average Fair value      
Percentage of number of units granted 200.00%    
Performance-based Awards | Other Performance Plans
     
Weighted Average Fair value      
Shares issued 900,000   100,000
Performance-based Awards | 2006 performance plan
     
Weighted Average Fair value      
Shares issued   300,000  
Performance-based Awards | 2008 Leadership Performance Plan ("LPP") cycle
     
Weighted Average Fair value      
Shares issued   1,200,000  
Performance-based Awards | LPP cycle
     
Weighted Average Fair value      
Shares issued 1,400,000    
Performance-based Awards | 2007 Leadership Performance Plan ("LPP") cycle
     
Weighted Average Fair value      
Shares issued     1,600,000
Share options
     
Share-based Compensation Arrangement by Share-based Payment Award      
Share-based compensation expense $ 5 $ 9 $ 17
Vesting period 4 years