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Securities (Details 2) - USD ($)
$ in Millions
Jun. 30, 2016
Dec. 31, 2015
Securities available for sale    
Securities available for sale, Less than 12 months, Fair Value $ 2,025 $ 7,836
Securities available for sale, Less than 12 months, Unrealized Losses 16 99
Securities available for sale, 12 months or more, Fair Value 2,773 4,362
Securities available for sale, 12 months or more, Unrealized Losses 41 84
Securities available for sale, Fair Value, Total 4,798 12,198
Securities available for sale, Unrealized Losses, Total 57 183
US Treasury Securities    
Securities available for sale    
Securities available for sale, Less than 12 months, Fair Value   295
Securities available for sale, Less than 12 months, Unrealized Losses   3
Securities available for sale, 12 months or more, Fair Value   0
Securities available for sale, 12 months or more, Unrealized Losses   0
Securities available for sale, Fair Value, Total   295
Securities available for sale, Unrealized Losses, Total   3
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 104 4,692
Securities available for sale, Less than 12 months, Unrealized Losses 1 57
Securities available for sale, 12 months or more, Fair Value 873 2,278
Securities available for sale, 12 months or more, Unrealized Losses 3 41
Securities available for sale, Fair Value, Total 977 6,970
Securities available for sale, Unrealized Losses, Total 4 98
Residential mortgage-backed securities, Privately issued    
Securities available for sale    
Securities available for sale, Less than 12 months, Fair Value 11 39
Securities available for sale, Less than 12 months, Unrealized Losses 0 0
Securities available for sale, 12 months or more, Fair Value 38 38
Securities available for sale, 12 months or more, Unrealized Losses 0 1
Securities available for sale, Fair Value, Total 49 77
Securities available for sale, Unrealized Losses, Total 0 1
Privately issued - commercial mortgage-backed securities    
Securities available for sale    
Securities available for sale, Less than 12 months, Fair Value 10 1,154
Securities available for sale, Less than 12 months, Unrealized Losses 0 24
Securities available for sale, 12 months or more, Fair Value 58 65
Securities available for sale, 12 months or more, Unrealized Losses 1 1
Securities available for sale, Fair Value, Total 68 1,219
Securities available for sale, Unrealized Losses, Total 1 25
Collateralized loan obligations    
Securities available for sale    
Securities available for sale, Less than 12 months, Fair Value 1,652 1,497
Securities available for sale, Less than 12 months, Unrealized Losses 8 11
Securities available for sale, 12 months or more, Fair Value 1,315 1,290
Securities available for sale, 12 months or more, Unrealized Losses 22 23
Securities available for sale, Fair Value, Total 2,967 2,787
Securities available for sale, Unrealized Losses, Total 30 34
Asset-backed and other    
Securities available for sale    
Securities available for sale, Less than 12 months, Fair Value 0  
Securities available for sale, Less than 12 months, Unrealized Losses 0  
Securities available for sale, 12 months or more, Fair Value 1  
Securities available for sale, 12 months or more, Unrealized Losses 0  
Securities available for sale, Fair Value, Total 1  
Securities available for sale, Unrealized Losses, Total 0  
Asset Liability Management securities    
Securities available for sale    
Securities available for sale, Less than 12 months, Fair Value 1,777 7,677
Securities available for sale, Less than 12 months, Unrealized Losses 9 95
Securities available for sale, 12 months or more, Fair Value 2,285 3,671
Securities available for sale, 12 months or more, Unrealized Losses 26 66
Securities available for sale, Fair Value, Total 4,062 11,348
Securities available for sale, Unrealized Losses, Total 35 161
Other debt securities, Direct bank purchase bonds    
Securities available for sale    
Securities available for sale, Less than 12 months, Fair Value 248 157
Securities available for sale, Less than 12 months, Unrealized Losses 7 4
Securities available for sale, 12 months or more, Fair Value 483 686
Securities available for sale, 12 months or more, Unrealized Losses 15 18
Securities available for sale, Fair Value, Total 731 843
Securities available for sale, Unrealized Losses, Total 22 22
Other debt securities, Other    
Securities available for sale    
Securities available for sale, Less than 12 months, Fair Value   2
Securities available for sale, Less than 12 months, Unrealized Losses   0
Securities available for sale, 12 months or more, Fair Value   0
Securities available for sale, 12 months or more, Unrealized Losses   0
Securities available for sale, Fair Value, Total   2
Securities available for sale, Unrealized Losses, Total   0
Equity securities    
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 5 5
Securities available for sale, 12 months or more, Unrealized Losses 0 0
Securities available for sale, Fair Value, Total 5 5
Securities available for sale, Unrealized Losses, Total $ 0 $ 0