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Discontinued Operations (Details 6) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Operating results of discontinued operations        
Income from discontinued operations before income tax $ 2,164 $ 195 $ 2,721 $ 507
Auto Finance [Member]
       
Operating results of discontinued operations        
Net interest income and other revenues            
Income from discontinued operations before income tax   $ (2)   $ (4)