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INVESTMENT SECURITIES - Schedule of Unrealized Losses (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Dec. 31, 2024
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Investment securities available for sale |  |
Investment securities available for sale, less than 12 months, fair value | $ 2,871 | $ 12,460
Investment securities available for sale, less than 12 months, unrealized losses | (14) | (81)
Investment securities available for sale, 12 months or more, fair value | 5,881 | 6,413
Investment securities available for sale, 12 months or more, unrealized losses | (646) | (762)
Investment securities available for sale, fair value | 8,752 | 18,873
Investment securities available for sale, unrealized losses | (660) | (843)
U.S. Treasury |  |
Investment securities available for sale |  |
Investment securities available for sale, less than 12 months, fair value | 902 | 3,791
Investment securities available for sale, less than 12 months, unrealized losses | (2) | (12)
Investment securities available for sale, 12 months or more, fair value | 590 | 981
Investment securities available for sale, 12 months or more, unrealized losses | (8) | (15)
Investment securities available for sale, fair value | 1,492 | 4,772
Investment securities available for sale, unrealized losses | (10) | (27)
Government agency |  |
Investment securities available for sale |  |
Investment securities available for sale, less than 12 months, fair value | 0 | 0
Investment securities available for sale, less than 12 months, unrealized losses | 0 | 0
Investment securities available for sale, 12 months or more, fair value | 69 | 77
Investment securities available for sale, 12 months or more, unrealized losses | (2) | (2)
Investment securities available for sale, fair value | 69 | 77
Investment securities available for sale, unrealized losses | (2) | (2)
Residential mortgage-backed securities |  |
Investment securities available for sale |  |
Investment securities available for sale, less than 12 months, fair value | 1,796 | 7,470
Investment securities available for sale, less than 12 months, unrealized losses | (10) | (61)
Investment securities available for sale, 12 months or more, fair value | 3,531 | 3,575
Investment securities available for sale, 12 months or more, unrealized losses | (433) | (521)
Investment securities available for sale, fair value | 5,327 | 11,045
Investment securities available for sale, unrealized losses | (443) | (582)
Commercial mortgage-backed securities |  |
Investment securities available for sale |  |
Investment securities available for sale, less than 12 months, fair value | 126 | 1,183
Investment securities available for sale, less than 12 months, unrealized losses | (1) | (8)
Investment securities available for sale, 12 months or more, fair value | 1,285 | 1,342
Investment securities available for sale, 12 months or more, unrealized losses | (185) | (202)
Investment securities available for sale, fair value | 1,411 | 2,525
Investment securities available for sale, unrealized losses | (186) | (210)
Corporate Bonds |  |
Investment securities available for sale |  |
Investment securities available for sale, less than 12 months, fair value | 47 | 16
Investment securities available for sale, less than 12 months, unrealized losses | (1) | 0
Investment securities available for sale, 12 months or more, fair value | 406 | 438
Investment securities available for sale, 12 months or more, unrealized losses | (18) | (22)
Investment securities available for sale, fair value | 453 | 454
Investment securities available for sale, unrealized losses | $ (19) | $ (22)

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