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Securities - Schedule of Continuous Unrealized Loss Position (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Securities available for sale    
Less than 12 months, Fair Value $ 8,919 $ 7,836
Less than 12 months, Unrealized Losses 259 99
12 months or more, Fair Value 2,289 4,362
12 months or more, Unrealized Losses 32 84
Fair Value, Total 11,208 12,198
Unrealized Losses, Total 291 183
U.S. Treasury    
Securities available for sale    
Less than 12 months, Fair Value 2,257 295
Less than 12 months, Unrealized Losses 121 3
12 months or more, Fair Value 0 0
12 months or more, Unrealized Losses 0 0
Fair Value, Total 2,257 295
Unrealized Losses, Total 121 3
U.S. government agency and government-sponsored agencies    
Securities available for sale    
Less than 12 months, Fair Value 5,501 4,692
Less than 12 months, Unrealized Losses 113 57
12 months or more, Fair Value 667 2,278
12 months or more, Unrealized Losses 9 41
Fair Value, Total 6,168 6,970
Unrealized Losses, Total 122 98
Privately issued    
Securities available for sale    
Less than 12 months, Fair Value 249 39
Less than 12 months, Unrealized Losses 6 0
12 months or more, Fair Value 29 38
12 months or more, Unrealized Losses 1 1
Fair Value, Total 278 77
Unrealized Losses, Total 7 1
Privately issued - commercial mortgage-backed securities    
Securities available for sale    
Less than 12 months, Fair Value 415 1,154
Less than 12 months, Unrealized Losses 6 24
12 months or more, Fair Value 11 65
12 months or more, Unrealized Losses 0 1
Fair Value, Total 426 1,219
Unrealized Losses, Total 6 25
Collateralized loan obligations    
Securities available for sale    
Less than 12 months, Fair Value 75 1,497
Less than 12 months, Unrealized Losses 0 11
12 months or more, Fair Value 1,077 1,290
12 months or more, Unrealized Losses 5 23
Fair Value, Total 1,152 2,787
Unrealized Losses, Total 5 34
Other    
Securities available for sale    
Less than 12 months, Fair Value 0  
Less than 12 months, Unrealized Losses 0  
12 months or more, Fair Value 1  
12 months or more, Unrealized Losses 0  
Fair Value, Total 1  
Unrealized Losses, Total 0  
Asset Liability Management securities    
Securities available for sale    
Less than 12 months, Fair Value 8,497 7,677
Less than 12 months, Unrealized Losses 246 95
12 months or more, Fair Value 1,785 3,671
12 months or more, Unrealized Losses 15 66
Fair Value, Total 10,282 11,348
Unrealized Losses, Total 261 161
Direct bank purchase bonds    
Securities available for sale    
Less than 12 months, Fair Value 386 157
Less than 12 months, Unrealized Losses 12 4
12 months or more, Fair Value 499 686
12 months or more, Unrealized Losses 17 18
Fair Value, Total 885 843
Unrealized Losses, Total 29 22
Other    
Securities available for sale    
Less than 12 months, Fair Value 36 2
Less than 12 months, Unrealized Losses 1 0
12 months or more, Fair Value 0 0
12 months or more, Unrealized Losses 0 0
Fair Value, Total 36 2
Unrealized Losses, Total 1 0
Equity securities    
Securities available for sale    
Less than 12 months, Fair Value 0 0
Less than 12 months, Unrealized Losses 0 0
12 months or more, Fair Value 5 5
12 months or more, Unrealized Losses 0 0
Fair Value, Total 5 5
Unrealized Losses, Total $ 0 $ 0