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Discontinued Operations (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Results of discontinued credit card operations        
Income from discontinued operations before income tax expense $ 74 $ 196 $ 315 $ 464
Credit Card Receivable [Member]
       
Results of discontinued credit card operations        
Net interest income and other revenues 129 558 541 1,106
Income from discontinued operations before income tax expense $ 74 $ 195 $ 315 $ 465