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Securities (Details 1) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Securities available for sale, fair value and unrealized losses    
Securities available for sale, Less than 12 Months, Fair Value $ 518 $ 1,775
Securities available for sale, 12 months or more, Fair Value 314 161
Securities available for sale, Fair Value, Total 832 1,936
Securities available for sale, Less than 12 Months, Unrealized Losses 6 30
Securities available for sale, 12 months or more, Unrealized Losses 36 40
Securities available for sale, Unrealized Losses, Total 42 70
U.S. government and government sponsored agencies [Member]
   
Securities available for sale, fair value and unrealized losses    
Securities available for sale, Less than 12 Months, Fair Value 232 1,106
Securities available for sale, 12 months or more, Fair Value 25 59
Securities available for sale, Fair Value, Total 257 1,165
Securities available for sale, Less than 12 Months, Unrealized Losses 1 4
Securities available for sale, Unrealized Losses, Total 1 4
Privately issued [Member]
   
Securities available for sale, fair value and unrealized losses    
Securities available for sale, Less than 12 Months, Fair Value 87 551
Securities available for sale, 12 months or more, Fair Value 247 99
Securities available for sale, Fair Value, Total 334 650
Securities available for sale, Less than 12 Months, Unrealized Losses 1 23
Securities available for sale, 12 months or more, Unrealized Losses 33 40
Securities available for sale, Unrealized Losses, Total 34 63
Commercial mortgage-backed securities [Member]
   
Securities available for sale, fair value and unrealized losses    
Securities available for sale, Less than 12 Months, Fair Value 123 95
Securities available for sale, 12 months or more, Fair Value 19  
Securities available for sale, Fair Value, Total 142 95
Securities available for sale, Less than 12 Months, Unrealized Losses   1
Securities available for sale, 12 months or more, Unrealized Losses 2  
Securities available for sale, Unrealized Losses, Total 2 1
Other debt securities [Member]
   
Securities available for sale, fair value and unrealized losses    
Securities available for sale, Less than 12 Months, Fair Value 76 23
Securities available for sale, 12 months or more, Fair Value 23 3
Securities available for sale, Fair Value, Total 99 26
Securities available for sale, Less than 12 Months, Unrealized Losses 4 2
Securities available for sale, 12 months or more, Unrealized Losses 1  
Securities available for sale, Unrealized Losses, Total $ 5 $ 2