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Share-Based Compensation Plans (Details) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award            
Share-based compensation expense $ 50 $ 47 $ 105 $ 121    
Employee share purchase plans
           
Share-based Compensation Arrangement by Share-based Payment Award            
Share-based compensation expense 2 2 4 3    
Restricted share units ("RSUs")
           
Share-based Compensation Arrangement by Share-based Payment Award            
Share-based compensation expense 34 33 83 78    
Non-vested share awards            
Non-vested at beginning of period (in shares)     9,916,000 10,674,000 10,674,000  
Granted (in shares)     4,706,000 3,124,000    
Vested (in shares)     (2,986,000) (4,550,000)    
Forfeited (in shares)     (356,000) (283,000)    
Non-vested at end of period (in shares) 11,280,000 8,965,000 11,280,000 8,965,000    
Weighted Average Fair value            
Non-vested at beginning of period (in dollars per share)     $ 42 $ 38 $ 38  
Granted (in dollars per share)     $ 45 $ 52    
Vested (in dollars per share)     $ 42 $ 39    
Forfeited (in dollars per share)     $ 44 $ 40    
Non-vested at end of period (in dollars per share) $ 44 $ 42 $ 44 $ 42    
Performance-based Awards
           
Share-based Compensation Arrangement by Share-based Payment Award            
Share-based compensation expense 13 10 15 35    
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     1,367,000   1,131,000 1,245,000
Unamortized expense, based on current 58   58   30 8
Share options
           
Share-based Compensation Arrangement by Share-based Payment Award            
Share-based compensation expense $ 1 $ 2 $ 3 $ 5    
Weighted Average Fair value            
Shares granted       80,000    
Shares granted (in dollars per share)       $ 53    
Share options | Incentive compensation plans
           
Weighted Average Fair value            
Shares granted       80,000    
Shares granted (in dollars per share)       $ 53