v2.4.0.6
Securities Available for Sale, Other-Than-Temporary Impairment (OTTI), Included in Earnings (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Other-Than-Temporary Impairment Equity Securities Earnings [Abstract]    
Securities available for sale $ 51 $ 80
Nonmarketable equity securities 14 41
Total OTTI write-downs included in earnings 65 121
Debt Securities [Member]
   
Other-Than-Temporary Impairment Debt Securities Earnings [Abstract]    
Debt securities 50 80
Other-Than-Temporary Impairment Equity Securities Earnings [Abstract]    
Securities available for sale 50 80
US States and Political Subdivisions [Member]
   
Other-Than-Temporary Impairment Debt Securities Earnings [Abstract]    
Debt securities 0 0
Residential [Member]
   
Other-Than-Temporary Impairment Debt Securities Earnings [Abstract]    
Debt securities 14 62
Other-Than-Temporary Impairment Equity Securities Earnings [Abstract]    
Securities available for sale 14 62
Commercial [Member]
   
Other-Than-Temporary Impairment Debt Securities Earnings [Abstract]    
Debt securities 30 14
Corporate debt securities [Member]
   
Other-Than-Temporary Impairment Debt Securities Earnings [Abstract]    
Debt securities 1 0
Collateralized debt obligations [Member]
   
Other-Than-Temporary Impairment Debt Securities Earnings [Abstract]    
Debt securities 0 0
Other Debt Securities [Member]
   
Other-Than-Temporary Impairment Debt Securities Earnings [Abstract]    
Debt securities 5 4
Equity Securities [Member]
   
Other-Than-Temporary Impairment Equity Securities Earnings [Abstract]    
Equity securities 1 0
Perpetual preferred securities [Member]
   
Other-Than-Temporary Impairment Equity Securities Earnings [Abstract]    
Equity securities $ 1 $ 0