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Securities - Securities Available for Sale with a Continuous Unrealized Loss Position (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Securities available for sale    
Securities available for sale, Less than 12 months, Fair Value $ 2,076 $ 4,677
Securities available for sale, Less than 12 months, Unrealized Losses 11 50
Securities available for sale, 12 months or more, Fair Value 6,824 9,295
Securities available for sale, 12 months or more, Unrealized Losses 91 357
Securities available for sale, Fair Value, Total 8,900 13,972
Securities available for sale, Unrealized Losses, Total 102 407
U.S. Treasury    
Securities available for sale    
Securities available for sale, Less than 12 months, Fair Value 0 147
Securities available for sale, Less than 12 months, Unrealized Losses 0 1
Securities available for sale, 12 months or more, Fair Value 2,113 3,182
Securities available for sale, 12 months or more, Unrealized Losses 25 143
Securities available for sale, Fair Value, Total 2,113 3,329
Securities available for sale, Unrealized Losses, Total 25 144
U.S. government agency and government-sponsored agencies    
Securities available for sale    
Securities available for sale, Less than 12 months, Fair Value 1,161 1,941
Securities available for sale, Less than 12 months, Unrealized Losses 6 8
Securities available for sale, 12 months or more, Fair Value 3,700 4,797
Securities available for sale, 12 months or more, Unrealized Losses 42 160
Securities available for sale, Fair Value, Total 4,861 6,738
Securities available for sale, Unrealized Losses, Total 48 168
Privately issued    
Securities available for sale    
Securities available for sale, Less than 12 months, Fair Value 19 398
Securities available for sale, Less than 12 months, Unrealized Losses 0 7
Securities available for sale, 12 months or more, Fair Value 383 383
Securities available for sale, 12 months or more, Unrealized Losses 4 16
Securities available for sale, Fair Value, Total 402 781
Securities available for sale, Unrealized Losses, Total 4 23
Privately issued - commercial mortgage-backed securities    
Securities available for sale    
Securities available for sale, Less than 12 months, Fair Value 32 364
Securities available for sale, Less than 12 months, Unrealized Losses 0 6
Securities available for sale, 12 months or more, Fair Value 29 512
Securities available for sale, 12 months or more, Unrealized Losses 0 14
Securities available for sale, Fair Value, Total 61 876
Securities available for sale, Unrealized Losses, Total 0 20
Collateralized loan obligations    
Securities available for sale    
Securities available for sale, Less than 12 months, Fair Value 838 1,428
Securities available for sale, Less than 12 months, Unrealized Losses 3 18
Securities available for sale, 12 months or more, Fair Value 263 0
Securities available for sale, 12 months or more, Unrealized Losses 3 0
Securities available for sale, Fair Value, Total 1,101 1,428
Securities available for sale, Unrealized Losses, Total 6 18
Asset Liability Management securities    
Securities available for sale    
Securities available for sale, Less than 12 months, Fair Value 2,050 4,278
Securities available for sale, Less than 12 months, Unrealized Losses 9 40
Securities available for sale, 12 months or more, Fair Value 6,488 8,874
Securities available for sale, 12 months or more, Unrealized Losses 74 333
Securities available for sale, Fair Value, Total 8,538 13,152
Securities available for sale, Unrealized Losses, Total 83 373
Direct bank purchase bonds    
Securities available for sale    
Securities available for sale, Less than 12 months, Fair Value 1 221
Securities available for sale, Less than 12 months, Unrealized Losses 1 6
Securities available for sale, 12 months or more, Fair Value 332 417
Securities available for sale, 12 months or more, Unrealized Losses 17 24
Securities available for sale, Fair Value, Total 333 638
Securities available for sale, Unrealized Losses, Total 18 30
Other    
Securities available for sale    
Securities available for sale, Less than 12 months, Fair Value 25 178
Securities available for sale, Less than 12 months, Unrealized Losses 1 4
Securities available for sale, 12 months or more, Fair Value 4 4
Securities available for sale, 12 months or more, Unrealized Losses 0 0
Securities available for sale, Fair Value, Total 29 182
Securities available for sale, Unrealized Losses, Total $ 1 $ 4