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Comprehensive Income (Details) (USD $)
In Millions
3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Components of Comprehensive Income, net of tax [Abstract]        
Net income $ 1,331 $ 1,017 $ 2,508 $ 1,902
Other comprehensive income gains (losses): [Abstract]        
Net unrealized securities gains (losses) 91 25 92 9
Net unrealized derivative gains 3 5 7 12
Foreign currency translation adjustments (4) (34) 62 (65)
Net unrealized pension and other postretirement benefit (losses) gains 8 8 5 35
Total $ 1,429 $ 1,021 $ 2,674 $ 1,893