v2.4.0.6
Securities Available for Sale, Other-Than-Temporary Impaired Debt Securities (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities [Abstract]    
Securities available for sale $ 51 $ 80
Total recorded directly to OCI for non-credit-related impairment (15) (156)
Debt Securities [Member]
   
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities [Abstract]    
Securities available for sale 50 80
Total recorded directly to OCI for non-credit-related impairment (15) (156)
Total OTTI losses recorded on debt securities 35 (76)
Debt Securities [Member] | Credit-related OTTI [Member]
   
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities [Abstract]    
Securities available for sale 50 79
Debt Securities [Member] | Other than temporary impairment on securities we intend to sell [Member]
   
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities [Abstract]    
Securities available for sale 0 1
US States and Political Subdivisions [Member]
   
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities [Abstract]    
Total recorded directly to OCI for non-credit-related impairment 0 0
Residential [Member]
   
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities [Abstract]    
Securities available for sale 14 62
Total recorded directly to OCI for non-credit-related impairment (9) (104)
Commercial [Member]
   
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities [Abstract]    
Total recorded directly to OCI for non-credit-related impairment (6) (53)
Other Debt Securities [Member]
   
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities [Abstract]    
Total recorded directly to OCI for non-credit-related impairment 1 1
Corporate debt securities [Member]
   
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities [Abstract]    
Total recorded directly to OCI for non-credit-related impairment $ (1) $ 0