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INVESTMENT SECURITIES - Schedule of Unrealized Losses (Details) - USD ($) $ in Millions | Jun. 30, 2024 | Dec. 31, 2023
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Investment securities available for sale |  |
Investment securities available for sale, less than 12 months, fair value | $ 13,976 | $ 1,517
Investment securities available for sale, less than 12 months, unrealized losses | (73) | (13)
Investment securities available for sale, 12 months or more, fair value | 7,447 | 7,865
Investment securities available for sale, 12 months or more, unrealized losses | (870) | (854)
Investment securities available for sale, fair value | 21,423 | 9,382
Investment securities available for sale, unrealized losses | (943) | (867)
U.S. Treasury |  |
Investment securities available for sale |  |
Investment securities available for sale, less than 12 months, fair value | 7,954 | 955
Investment securities available for sale, less than 12 months, unrealized losses | (18) | 0
Investment securities available for sale, 12 months or more, fair value | 1,745 | 1,919
Investment securities available for sale, 12 months or more, unrealized losses | (52) | (80)
Investment securities available for sale, fair value | 9,699 | 2,874
Investment securities available for sale, unrealized losses | (70) | (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 | 97 | 94
Investment securities available for sale, 12 months or more, unrealized losses | (2) | (3)
Investment securities available for sale, fair value | 97 | 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 | 5,129 | 293
Investment securities available for sale, less than 12 months, unrealized losses | (42) | (3)
Investment securities available for sale, 12 months or more, fair value | 3,884 | 4,073
Investment securities available for sale, 12 months or more, unrealized losses | (577) | (537)
Investment securities available for sale, fair value | 9,013 | 4,366
Investment securities available for sale, unrealized losses | (619) | (540)
Commercial mortgage-backed securities |  |
Investment securities available for sale |  |
Investment securities available for sale, less than 12 months, fair value | 822 | 157
Investment securities available for sale, less than 12 months, unrealized losses | (6) | (1)
Investment securities available for sale, 12 months or more, fair value | 1,322 | 1,386
Investment securities available for sale, 12 months or more, unrealized losses | (206) | (196)
Investment securities available for sale, fair value | 2,144 | 1,543
Investment securities available for sale, unrealized losses | (212) | (197)
Corporate Bonds |  |
Investment securities available for sale |  |
Investment securities available for sale, less than 12 months, fair value | 71 | 89
Investment securities available for sale, less than 12 months, unrealized losses | (7) | (9)
Investment securities available for sale, 12 months or more, fair value | 399 | 393
Investment securities available for sale, 12 months or more, unrealized losses | (33) | (38)
Investment securities available for sale, fair value | 470 | 482
Investment securities available for sale, unrealized losses | $ (40) | $ (47)

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