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Capital Transactions (Details 2) (USD $)
In Millions, except Per Share data, unless otherwise specified
0 Months Ended 3 Months Ended
Jun. 01, 2012
May 16, 2012
Mar. 31, 2013
Mar. 31, 2012
Dividends        
Dividends per common share (in dollars per share)     $ 0.19 $ 0.18
Dividends payable     $ 217  
Cash dividend payment   201    
Dividend equivalent payment $ 3