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Securities - Securities Available for Sale with a Continuous Unrealized Loss Position (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Securities available for sale    
Securities available for sale, Less than 12 months, Fair Value $ 2,992 $ 7,857
Securities available for sale, Less than 12 months, Unrealized Losses 111 83
Securities available for sale, 12 months or more, Fair Value 1,803 4,563
Securities available for sale, 12 months or more, Unrealized Losses 64 62
Securities available for sale, Fair Value, Total 4,795 12,420
Securities available for sale, Unrealized Losses, Total 175 145
U.S. Treasury and government agencies    
Securities available for sale    
Securities available for sale, Less than 12 months, Fair Value   4,407
Securities available for sale, Less than 12 months, Unrealized Losses   48
Securities available for sale, 12 months or more, Fair Value   543
Securities available for sale, 12 months or more, Unrealized Losses   5
Securities available for sale, Fair Value, Total   4,950
Securities available for sale, Unrealized Losses, Total   53
U.S. agencies    
Securities available for sale    
Securities available for sale, Less than 12 months, Fair Value 511 914
Securities available for sale, Less than 12 months, Unrealized Losses 7 4
Securities available for sale, 12 months or more, Fair Value 1,138 2,769
Securities available for sale, 12 months or more, Unrealized Losses 22 32
Securities available for sale, Fair Value, Total 1,649 3,683
Securities available for sale, Unrealized Losses, Total 29 36
Residential - non-agency    
Securities available for sale    
Securities available for sale, Less than 12 months, Fair Value 478 127
Securities available for sale, Less than 12 months, Unrealized Losses 8 0
Securities available for sale, 12 months or more, Fair Value 47 155
Securities available for sale, 12 months or more, Unrealized Losses 2 2
Securities available for sale, Fair Value, Total 525 282
Securities available for sale, Unrealized Losses, Total 10 2
Commercial - non-agency    
Securities available for sale    
Securities available for sale, Less than 12 months, Fair Value 830 1,669
Securities available for sale, Less than 12 months, Unrealized Losses 27 28
Securities available for sale, 12 months or more, Fair Value 2 12
Securities available for sale, 12 months or more, Unrealized Losses 0 0
Securities available for sale, Fair Value, Total 832 1,681
Securities available for sale, Unrealized Losses, Total 27 28
Collateralized loan obligations    
Securities available for sale    
Securities available for sale, Less than 12 months, Fair Value 984 597
Securities available for sale, Less than 12 months, Unrealized Losses 60 2
Securities available for sale, 12 months or more, Fair Value 343 790
Securities available for sale, 12 months or more, Unrealized Losses 31 6
Securities available for sale, Fair Value, Total 1,327 1,387
Securities available for sale, Unrealized Losses, Total 91 8
Direct bank purchase bonds    
Securities available for sale    
Securities available for sale, Less than 12 months, Fair Value 23 118
Securities available for sale, Less than 12 months, Unrealized Losses 1 1
Securities available for sale, 12 months or more, Fair Value 273 294
Securities available for sale, 12 months or more, Unrealized Losses 9 17
Securities available for sale, Fair Value, Total 296 412
Securities available for sale, Unrealized Losses, Total 10 18
Other    
Securities available for sale    
Securities available for sale, Less than 12 months, Fair Value 166 25
Securities available for sale, Less than 12 months, Unrealized Losses 8 0
Securities available for sale, 12 months or more, Fair Value 0 0
Securities available for sale, 12 months or more, Unrealized Losses 0 0
Securities available for sale, Fair Value, Total 166 25
Securities available for sale, Unrealized Losses, Total $ 8 $ 0