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Securities - Securities Available for Sale with a Continuous Unrealized Loss Position (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Securities available for sale    
Securities available for sale, Less than 12 months, Fair Value $ 9,004 $ 1,926
Securities available for sale, Less than 12 months, Unrealized Losses 174 15
Securities available for sale, 12 months or more, Fair Value 551 1,446
Securities available for sale, 12 months or more, Unrealized Losses 10 11
Securities available for sale, Fair Value, Total 9,555 3,372
Securities available for sale, Unrealized Losses, Total 184 26
U.S. Treasury and government agencies    
Securities available for sale    
Securities available for sale, Less than 12 months, Fair Value 4,701 635
Securities available for sale, Less than 12 months, Unrealized Losses 90 2
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 4,701 635
Securities available for sale, Unrealized Losses, Total 90 2
U.S. agencies    
Securities available for sale    
Securities available for sale, Less than 12 months, Fair Value 2,885 43
Securities available for sale, Less than 12 months, Unrealized Losses 60 0
Securities available for sale, 12 months or more, Fair Value 249 732
Securities available for sale, 12 months or more, Unrealized Losses 1 2
Securities available for sale, Fair Value, Total 3,134 775
Securities available for sale, Unrealized Losses, Total 61 2
Residential - non-agency    
Securities available for sale    
Securities available for sale, Less than 12 months, Fair Value 379 275
Securities available for sale, Less than 12 months, Unrealized Losses 6 2
Securities available for sale, 12 months or more, Fair Value 12 15
Securities available for sale, 12 months or more, Unrealized Losses 0 0
Securities available for sale, Fair Value, Total 391 290
Securities available for sale, Unrealized Losses, Total 6 2
Commercial - non-agency    
Securities available for sale    
Securities available for sale, Less than 12 months, Fair Value 646 354
Securities available for sale, Less than 12 months, Unrealized Losses 18 9
Securities available for sale, 12 months or more, Fair Value 52 25
Securities available for sale, 12 months or more, Unrealized Losses 2 0
Securities available for sale, Fair Value, Total 698 379
Securities available for sale, Unrealized Losses, Total 20 9
Collateralized loan obligations    
Securities available for sale    
Securities available for sale, Less than 12 months, Fair Value 342 593
Securities available for sale, Less than 12 months, Unrealized Losses 0 1
Securities available for sale, 12 months or more, Fair Value 93 477
Securities available for sale, 12 months or more, Unrealized Losses 1 3
Securities available for sale, Fair Value, Total 435 1,070
Securities available for sale, Unrealized Losses, Total 1 4
Direct bank purchase bonds    
Securities available for sale    
Securities available for sale, Less than 12 months, Fair Value 51 26
Securities available for sale, Less than 12 months, Unrealized Losses 0 1
Securities available for sale, 12 months or more, Fair Value 145 197
Securities available for sale, 12 months or more, Unrealized Losses 6 6
Securities available for sale, Fair Value, Total 196 223
Securities available for sale, Unrealized Losses, Total $ 6 $ 7