v2.4.0.8
Securities Available for Sale, Other-Than-Temporary Impairment (OTTI), Included in Earnings (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities [Abstract]        
Securities available for sale $ 76 $ 82 $ 114 $ 133
Nonmarketable equity investments 35 38 75 52
Total OTTI write-downs included in earnings 111 120 189 185
Debt Securities [Member]
       
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities [Abstract]        
Securities available for sale 71 77 105 127
US States and Political Subdivisions [Member]
       
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities [Abstract]        
Securities available for sale 0 9 0 9
Residential [Member]
       
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities [Abstract]        
Securities available for sale 22 34 37 48
Commercial [Member]
       
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities [Abstract]        
Securities available for sale 26 3 41 33
Federal agencies [Member]
       
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities [Abstract]        
Securities available for sale 1 0 1 0
Corporate debt securities [Member]
       
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities [Abstract]        
Securities available for sale 0 3 2 4
Collateralized loan and other debt obligations [Member]
       
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities [Abstract]        
Securities available for sale 0 1 0 1
Other Debt Securities [Member]
       
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities [Abstract]        
Securities available for sale 22 27 24 32
Equity Securities [Member]
       
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities [Abstract]        
Securities available for sale 5 5 9 6
Perpetual preferred securities [Member]
       
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities [Abstract]        
Securities available for sale 0 5 0 6
Other equity securities [Member]
       
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities [Abstract]        
Securities available for sale $ 5 $ 0 $ 9 $ 0