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Securities (Details 2) - USD ($)
$ in Millions
Sep. 30, 2015
Dec. 31, 2014
Securities available for sale    
Securities available for sale, Less than 12 months, Fair Value $ 4,670 $ 1,496
Securities available for sale, Less than 12 months, Unrealized Losses 19 11
Securities available for sale, 12 months or more, Fair Value 4,493 9,595
Securities available for sale, 12 months or more, Unrealized Losses 59 160
Securities available for sale, Fair Value, Total 9,163 11,091
Securities available for sale, Unrealized Losses, Total 78 171
Residential mortgage-backed securities, U.S. government agency and government-sponsored agencies    
Securities available for sale    
Securities available for sale, Less than 12 months, Fair Value 2,724 611
Securities available for sale, Less than 12 months, Unrealized Losses 8 1
Securities available for sale, 12 months or more, Fair Value 2,396 6,258
Securities available for sale, 12 months or more, Unrealized Losses 19 90
Securities available for sale, Fair Value, Total 5,120 6,869
Securities available for sale, Unrealized Losses, Total 27 91
Residential mortgage-backed securities, Privately issued    
Securities available for sale    
Securities available for sale, Less than 12 months, Fair Value 10 9
Securities available for sale, Less than 12 months, Unrealized Losses 0 0
Securities available for sale, 12 months or more, Fair Value 41 49
Securities available for sale, 12 months or more, Unrealized Losses 1 1
Securities available for sale, Fair Value, Total 51 58
Securities available for sale, Unrealized Losses, Total 1 1
Privately issued - commercial mortgage-backed securities    
Securities available for sale    
Securities available for sale, Less than 12 months, Fair Value 710 143
Securities available for sale, Less than 12 months, Unrealized Losses 5 0
Securities available for sale, 12 months or more, Fair Value 76 842
Securities available for sale, 12 months or more, Unrealized Losses 1 13
Securities available for sale, Fair Value, Total 786 985
Securities available for sale, Unrealized Losses, Total 6 13
Collateralized loan obligations    
Securities available for sale    
Securities available for sale, Less than 12 months, Fair Value 1,182 657
Securities available for sale, Less than 12 months, Unrealized Losses 6 6
Securities available for sale, 12 months or more, Fair Value 1,203 1,481
Securities available for sale, 12 months or more, Unrealized Losses 19 31
Securities available for sale, Fair Value, Total 2,385 2,138
Securities available for sale, Unrealized Losses, Total 25 37
Asset-backed and other    
Securities available for sale    
Securities available for sale, Less than 12 months, Fair Value 0 0
Securities available for sale, Less than 12 months, Unrealized Losses 0 0
Securities available for sale, 12 months or more, Fair Value 1 1
Securities available for sale, 12 months or more, Unrealized Losses 0 0
Securities available for sale, Fair Value, Total 1 1
Securities available for sale, Unrealized Losses, Total 0 0
Asset Liability Management securities    
Securities available for sale    
Securities available for sale, Less than 12 months, Fair Value 4,626 1,420
Securities available for sale, Less than 12 months, Unrealized Losses 19 7
Securities available for sale, 12 months or more, Fair Value 3,717 8,631
Securities available for sale, 12 months or more, Unrealized Losses 40 135
Securities available for sale, Fair Value, Total 8,343 10,051
Securities available for sale, Unrealized Losses, Total 59 142
Other debt securities, Direct bank purchase bonds    
Securities available for sale    
Securities available for sale, Less than 12 months, Fair Value 42 75
Securities available for sale, Less than 12 months, Unrealized Losses 0 3
Securities available for sale, 12 months or more, Fair Value 771 937
Securities available for sale, 12 months or more, Unrealized Losses 19 24
Securities available for sale, Fair Value, Total 813 1,012
Securities available for sale, Unrealized Losses, Total 19 27
Other debt securities, Other    
Securities available for sale    
Securities available for sale, Less than 12 months, Fair Value 2 0
Securities available for sale, Less than 12 months, Unrealized Losses 0 0
Securities available for sale, 12 months or more, Fair Value 0 22
Securities available for sale, 12 months or more, Unrealized Losses 0 1
Securities available for sale, Fair Value, Total 2 22
Securities available for sale, Unrealized Losses, Total 0 1
Equity securities    
Securities available for sale    
Securities available for sale, Less than 12 months, Fair Value 0 1
Securities available for sale, Less than 12 months, Unrealized Losses 0 1
Securities available for sale, 12 months or more, Fair Value 5 5
Securities available for sale, 12 months or more, Unrealized Losses 0 0
Securities available for sale, Fair Value, Total 5 6
Securities available for sale, Unrealized Losses, Total $ 0 $ 1