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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
Operating results of discontinued operations        
Income from discontinued operations before income tax $ 2,164 $ 195 $ 2,721 $ 507
Insurance Business [Member]
       
Operating results of discontinued operations        
Net interest income and other revenues (13) 97 64 182
Income from discontinued operations before income tax $ (89) $ 13 $ (100) $ 16