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Investment Securities (Summary of OTTI Credit Losses Recognized in Earnings) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]      
OTTI credit losses recognized in earnings $ (152) $ (325) $ (577)
Residential Mortgage-backed Securities [Member] | Mortgage-backed Securities Non-agency [Member]
     
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]      
OTTI credit losses recognized in earnings (130) (242)  
Commercial Mortgage Backed Securities [Member] | Mortgage-backed Securities Non-agency [Member]
     
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]      
OTTI credit losses recognized in earnings   (5)  
Asset backed [Member]
     
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]      
OTTI credit losses recognized in earnings (21) (78)  
Other Debt Securities [Member]
     
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]      
OTTI credit losses recognized in earnings $ (1)