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Investment Securities - Schedule of Unrealized Losses (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Investment securities available for sale |  |
Investment securities available for sale, less than 12 months, fair value | $ 1,517 | $ 3,501
Investment securities available for sale, less than 12 months, unrealized losses | (13) | (276)
Investment securities available for sale, 12 months or more, fair value | 7,865 | 5,347
Investment securities available for sale, 12 months or more, unrealized losses | (854) | (697)
Investment securities available for sale, fair value | 9,382 | 8,848
Investment securities available for sale, unrealized losses | (867) | (973)
U.S. Treasury |  |
Investment securities available for sale |  |
Investment securities available for sale, less than 12 months, fair value | 955 | 403
Investment securities available for sale, less than 12 months, unrealized losses | 0 | (27)
Investment securities available for sale, 12 months or more, fair value | 1,919 | 1,495
Investment securities available for sale, 12 months or more, unrealized losses | (80) | (110)
Investment securities available for sale, fair value | 2,874 | 1,898
Investment securities available for sale, unrealized losses | (80) | (137)
Government agency |  |
Investment securities available for sale |  |
Investment securities available for sale, less than 12 months, fair value | 23 | 65
Investment securities available for sale, less than 12 months, unrealized losses | 0 | (1)
Investment securities available for sale, 12 months or more, fair value | 94 | 62
Investment securities available for sale, 12 months or more, unrealized losses | (3) | (1)
Investment securities available for sale, fair value | 117 | 127
Investment securities available for sale, unrealized losses | (3) | (2)
Residential mortgage-backed securities |  |
Investment securities available for sale |  |
Investment securities available for sale, less than 12 months, fair value | 293 | 1,698
Investment securities available for sale, less than 12 months, unrealized losses | (3) | (165)
Investment securities available for sale, 12 months or more, fair value | 4,073 | 3,001
Investment securities available for sale, 12 months or more, unrealized losses | (537) | (465)
Investment securities available for sale, fair value | 4,366 | 4,699
Investment securities available for sale, unrealized losses | (540) | (630)
Commercial mortgage-backed securities |  |
Investment securities available for sale |  |
Investment securities available for sale, less than 12 months, fair value | 157 | 836
Investment securities available for sale, less than 12 months, unrealized losses | (1) | (53)
Investment securities available for sale, 12 months or more, fair value | 1,386 | 752
Investment securities available for sale, 12 months or more, unrealized losses | (196) | (117)
Investment securities available for sale, fair value | 1,543 | 1,588
Investment securities available for sale, unrealized losses | (197) | (170)
Corporate Bonds |  |
Investment securities available for sale |  |
Investment securities available for sale, less than 12 months, fair value | 89 | 499
Investment securities available for sale, less than 12 months, unrealized losses | (9) | (30)
Investment securities available for sale, 12 months or more, fair value | 393 | 37
Investment securities available for sale, 12 months or more, unrealized losses | (38) | (4)
Investment securities available for sale, fair value | 482 | 536
Investment securities available for sale, unrealized losses | $ (47) | $ (34)

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