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INVESTMENT SECURITIES - Schedule of Unrealized Losses (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
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Investment securities available for sale |  |
Investment securities available for sale, less than 12 months, fair value | $ 1,001 | $ 12,460
Investment securities available for sale, less than 12 months, unrealized losses | (2) | (81)
Investment securities available for sale, 12 months or more, fair value | 5,220 | 6,413
Investment securities available for sale, 12 months or more, unrealized losses | (539) | (762)
Investment securities available for sale, fair value | 6,221 | 18,873
Investment securities available for sale, unrealized losses | (541) | (843)
U.S. Treasury |  |
Investment securities available for sale |  |
Investment securities available for sale, less than 12 months, fair value | 501 | 3,791
Investment securities available for sale, less than 12 months, unrealized losses | (1) | (12)
Investment securities available for sale, 12 months or more, fair value | 400 | 981
Investment securities available for sale, 12 months or more, unrealized losses | (1) | (15)
Investment securities available for sale, fair value | 901 | 4,772
Investment securities available for sale, unrealized losses | (2) | (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 | 52 | 77
Investment securities available for sale, 12 months or more, unrealized losses | (1) | (2)
Investment securities available for sale, fair value | 52 | 77
Investment securities available for sale, unrealized losses | (1) | (2)
Residential mortgage-backed securities |  |
Investment securities available for sale |  |
Investment securities available for sale, less than 12 months, fair value | 403 | 7,470
Investment securities available for sale, less than 12 months, unrealized losses | (1) | (61)
Investment securities available for sale, 12 months or more, fair value | 3,381 | 3,575
Investment securities available for sale, 12 months or more, unrealized losses | (350) | (521)
Investment securities available for sale, fair value | 3,784 | 11,045
Investment securities available for sale, unrealized losses | (351) | (582)
Commercial mortgage-backed securities |  |
Investment securities available for sale |  |
Investment securities available for sale, less than 12 months, fair value | 96 | 1,183
Investment securities available for sale, less than 12 months, unrealized losses | 0 | (8)
Investment securities available for sale, 12 months or more, fair value | 1,175 | 1,342
Investment securities available for sale, 12 months or more, unrealized losses | (181) | (202)
Investment securities available for sale, fair value | 1,271 | 2,525
Investment securities available for sale, unrealized losses | (181) | (210)
Corporate Bonds |  |
Investment securities available for sale |  |
Investment securities available for sale, less than 12 months, fair value | 1 | 16
Investment securities available for sale, less than 12 months, unrealized losses | 0 | 0
Investment securities available for sale, 12 months or more, fair value | 212 | 438
Investment securities available for sale, 12 months or more, unrealized losses | (6) | (22)
Investment securities available for sale, fair value | 213 | 454
Investment securities available for sale, unrealized losses | $ (6) | $ (22)

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