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Securities - Securities Available for Sale with a Continuous Unrealized Loss Position (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Securities available for sale    
Securities available for sale, Less than 12 months, Fair Value $ 1,576 $ 7,857
Securities available for sale, Less than 12 months, Unrealized Losses 38 83
Securities available for sale, 12 months or more, Fair Value 1,758 4,563
Securities available for sale, 12 months or more, Unrealized Losses 32 62
Securities available for sale, Fair Value, Total 3,334 12,420
Securities available for sale, Unrealized Losses, Total 70 145
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 114 914
Securities available for sale, Less than 12 months, Unrealized Losses 1 4
Securities available for sale, 12 months or more, Fair Value 1,078 2,769
Securities available for sale, 12 months or more, Unrealized Losses 6 32
Securities available for sale, Fair Value, Total 1,192 3,683
Securities available for sale, Unrealized Losses, Total 7 36
Residential - non-agency    
Securities available for sale    
Securities available for sale, Less than 12 months, Fair Value 89 127
Securities available for sale, Less than 12 months, Unrealized Losses 1 0
Securities available for sale, 12 months or more, Fair Value 17 155
Securities available for sale, 12 months or more, Unrealized Losses 0 2
Securities available for sale, Fair Value, Total 106 282
Securities available for sale, Unrealized Losses, Total 1 2
Commercial - non-agency    
Securities available for sale    
Securities available for sale, Less than 12 months, Fair Value 281 1,669
Securities available for sale, Less than 12 months, Unrealized Losses 13 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 283 1,681
Securities available for sale, Unrealized Losses, Total 13 28
Collateralized loan obligations    
Securities available for sale    
Securities available for sale, Less than 12 months, Fair Value 883 597
Securities available for sale, Less than 12 months, Unrealized Losses 21 2
Securities available for sale, 12 months or more, Fair Value 476 790
Securities available for sale, 12 months or more, Unrealized Losses 17 6
Securities available for sale, Fair Value, Total 1,359 1,387
Securities available for sale, Unrealized Losses, Total 38 8
Direct bank purchase bonds    
Securities available for sale    
Securities available for sale, Less than 12 months, Fair Value 159 118
Securities available for sale, Less than 12 months, Unrealized Losses 2 1
Securities available for sale, 12 months or more, Fair Value 185 294
Securities available for sale, 12 months or more, Unrealized Losses 9 17
Securities available for sale, Fair Value, Total 344 412
Securities available for sale, Unrealized Losses, Total 11 18
Other    
Securities available for sale    
Securities available for sale, Less than 12 months, Fair Value 50 25
Securities available for sale, Less than 12 months, Unrealized Losses 0 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 50 25
Securities available for sale, Unrealized Losses, Total $ 0 $ 0