v2.4.0.6
Securities Available for Sale, Other-Than-Temporary Impairment (OTTI), Included 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 Equity Securities Earnings [Abstract]      
Securities available for sale $ 541 $ 692 $ 1,094
Nonmarketable equity securities 170 248 573
Total OTTI write-downs included in earnings 711 940 1,667
Debt Securities [Member]
     
Other-Than-Temporary Impairment Debt Securities Earnings [Abstract]      
Debt securities 423 672 1,012
Other-Than-Temporary Impairment Equity Securities Earnings [Abstract]      
Securities available for sale 423 672 1,012
US States and Political Subdivisions [Member]
     
Other-Than-Temporary Impairment Debt Securities Earnings [Abstract]      
Debt securities 2 16 7
Residential [Member]
     
Other-Than-Temporary Impairment Debt Securities Earnings [Abstract]      
Debt securities 252 175 595
Other-Than-Temporary Impairment Equity Securities Earnings [Abstract]      
Securities available for sale 252 175 591
Commercial [Member]
     
Other-Than-Temporary Impairment Debt Securities Earnings [Abstract]      
Debt securities 101 120 137
Federal agencies [Member]
     
Other-Than-Temporary Impairment Debt Securities Earnings [Abstract]      
Debt securities 0 267 0
Corporate debt securities [Member]
     
Other-Than-Temporary Impairment Debt Securities Earnings [Abstract]      
Debt securities 3 10 69
Collateralized debt obligations [Member]
     
Other-Than-Temporary Impairment Debt Securities Earnings [Abstract]      
Debt securities 1 15 125
Other Debt Securities [Member]
     
Other-Than-Temporary Impairment Debt Securities Earnings [Abstract]      
Debt securities 64 69 79
Equity Securities [Member]
     
Other-Than-Temporary Impairment Equity Securities Earnings [Abstract]      
Equity securities 118 20 82
Perpetual preferred securities [Member]
     
Other-Than-Temporary Impairment Equity Securities Earnings [Abstract]      
Equity securities 96 15 50
Other equity securities [Member]
     
Other-Than-Temporary Impairment Equity Securities Earnings [Abstract]      
Equity securities $ 22 $ 5 $ 32