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INVESTMENT SECURITIES - Schedule of Unrealized Losses (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Investment securities available for sale |  |
Investment securities available for sale, less than 12 months, fair value | $ 12,460 | $ 1,517
Investment securities available for sale, less than 12 months, unrealized losses | (81) | (13)
Investment securities available for sale, 12 months or more, fair value | 6,413 | 7,865
Investment securities available for sale, 12 months or more, unrealized losses | (762) | (854)
Investment securities available for sale, fair value | 18,873 | 9,382
Investment securities available for sale, unrealized losses | (843) | (867)
U.S. Treasury |  |
Investment securities available for sale |  |
Investment securities available for sale, less than 12 months, fair value | 3,791 | 955
Investment securities available for sale, less than 12 months, unrealized losses | (12) | 0
Investment securities available for sale, 12 months or more, fair value | 981 | 1,919
Investment securities available for sale, 12 months or more, unrealized losses | (15) | (80)
Investment securities available for sale, fair value | 4,772 | 2,874
Investment securities available for sale, unrealized losses | (27) | (80)
Government agency |  |
Investment securities available for sale |  |
Investment securities available for sale, less than 12 months, fair value | 0 | 23
Investment securities available for sale, less than 12 months, unrealized losses | 0 | 0
Investment securities available for sale, 12 months or more, fair value | 77 | 94
Investment securities available for sale, 12 months or more, unrealized losses | (2) | (3)
Investment securities available for sale, fair value | 77 | 117
Investment securities available for sale, unrealized losses | (2) | (3)
Residential mortgage-backed securities |  |
Investment securities available for sale |  |
Investment securities available for sale, less than 12 months, fair value | 7,470 | 293
Investment securities available for sale, less than 12 months, unrealized losses | (61) | (3)
Investment securities available for sale, 12 months or more, fair value | 3,575 | 4,073
Investment securities available for sale, 12 months or more, unrealized losses | (521) | (537)
Investment securities available for sale, fair value | 11,045 | 4,366
Investment securities available for sale, unrealized losses | (582) | (540)
Commercial mortgage-backed securities |  |
Investment securities available for sale |  |
Investment securities available for sale, less than 12 months, fair value | 1,183 | 157
Investment securities available for sale, less than 12 months, unrealized losses | (8) | (1)
Investment securities available for sale, 12 months or more, fair value | 1,342 | 1,386
Investment securities available for sale, 12 months or more, unrealized losses | (202) | (196)
Investment securities available for sale, fair value | 2,525 | 1,543
Investment securities available for sale, unrealized losses | (210) | (197)
Corporate Bonds |  |
Investment securities available for sale |  |
Investment securities available for sale, less than 12 months, fair value | 16 | 89
Investment securities available for sale, less than 12 months, unrealized losses | 0 | (9)
Investment securities available for sale, 12 months or more, fair value | 438 | 393
Investment securities available for sale, 12 months or more, unrealized losses | (22) | (38)
Investment securities available for sale, fair value | 454 | 482
Investment securities available for sale, unrealized losses | $ (22) | $ (47)

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