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Securities - Securities Available for Sale with a Continuous Unrealized Loss Position (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Securities available for sale    
Securities available for sale, Less than 12 months, Fair Value $ 2,173 $ 7,857
Securities available for sale, Less than 12 months, Unrealized Losses 20 83
Securities available for sale, 12 months or more, Fair Value 1,486 4,563
Securities available for sale, 12 months or more, Unrealized Losses 17 62
Securities available for sale, Fair Value, Total 3,659 12,420
Securities available for sale, Unrealized Losses, Total 37 145
U.S. Treasury and government agencies    
Securities available for sale    
Securities available for sale, Less than 12 months, Fair Value 80 4,407
Securities available for sale, Less than 12 months, Unrealized Losses 0 48
Securities available for sale, 12 months or more, Fair Value 0 543
Securities available for sale, 12 months or more, Unrealized Losses 0 5
Securities available for sale, Fair Value, Total 80 4,950
Securities available for sale, Unrealized Losses, Total 0 53
U.S. agencies    
Securities available for sale    
Securities available for sale, Less than 12 months, Fair Value 561 914
Securities available for sale, Less than 12 months, Unrealized Losses 1 4
Securities available for sale, 12 months or more, Fair Value 801 2,769
Securities available for sale, 12 months or more, Unrealized Losses 2 32
Securities available for sale, Fair Value, Total 1,362 3,683
Securities available for sale, Unrealized Losses, Total 3 36
Residential - non-agency    
Securities available for sale    
Securities available for sale, Less than 12 months, Fair Value 162 127
Securities available for sale, Less than 12 months, Unrealized Losses 1 0
Securities available for sale, 12 months or more, Fair Value 16 155
Securities available for sale, 12 months or more, Unrealized Losses 0 2
Securities available for sale, Fair Value, Total 178 282
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 430 1,669
Securities available for sale, Less than 12 months, Unrealized Losses 8 28
Securities available for sale, 12 months or more, Fair Value 0 12
Securities available for sale, 12 months or more, Unrealized Losses 0 0
Securities available for sale, Fair Value, Total 430 1,681
Securities available for sale, Unrealized Losses, Total 8 28
Collateralized loan obligations    
Securities available for sale    
Securities available for sale, Less than 12 months, Fair Value 871 597
Securities available for sale, Less than 12 months, Unrealized Losses 8 2
Securities available for sale, 12 months or more, Fair Value 482 790
Securities available for sale, 12 months or more, Unrealized Losses 8 6
Securities available for sale, Fair Value, Total 1,353 1,387
Securities available for sale, Unrealized Losses, Total 16 8
Direct bank purchase bonds    
Securities available for sale    
Securities available for sale, Less than 12 months, Fair Value 69 118
Securities available for sale, Less than 12 months, Unrealized Losses 2 1
Securities available for sale, 12 months or more, Fair Value 187 294
Securities available for sale, 12 months or more, Unrealized Losses 7 17
Securities available for sale, Fair Value, Total 256 412
Securities available for sale, Unrealized Losses, Total 9 18
Other    
Securities available for sale    
Securities available for sale, Less than 12 months, Fair Value 0 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 0 25
Securities available for sale, Unrealized Losses, Total $ 0 $ 0