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INVESTMENT SECURITIES - Schedule of Investment Securities Maturity Information (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Investment securities available for sale |  |
Non-amortizing securities maturing in one year or less, amortized cost | $ 5,090 | $ 5,674
Non-amortizing securities maturing in after one through five years, amortized cost | 8,945 | 4,996
Non-amortizing securities maturing in after five through 10 years, amortized cost | 346 | 408
Non-amortizing securities maturing in after 10 years, amortized cost | 22 | 17
Amortized Cost | 34,512 | 20,688
Non-amortizing securities maturing in one year or less, fair value | 5,086 | 5,658
Non-amortizing securities maturing in after one through five years, fair value | 8,949 | 4,959
Non-amortizing securities maturing in after five through 10 years, fair value | 330 | 369
Non-amortizing securities maturing in after 10 years, fair value | 22 | 16
Investment securities available for sale, fair value | 33,750 | 19,936
Investment securities held to maturity |  |
Non-amortizing securities maturing in one year or less, amortized cost | 429 | 27
Non-amortizing securities maturing in after one through five years, amortized cost | 1,299 | 1,636
Non-amortizing securities maturing in after five through 10 years, amortized cost | 546 | 622
Amortized Cost | 10,239 | 9,979
Non-amortizing securities maturing in one year or less, fair value | 419 | 26
Non-amortizing securities maturing in after one through five years, fair value | 1,208 | 1,508
Non-amortizing securities maturing in after five through 10 years, fair value | 468 | 533
Investment securities held to maturity, cost, fair value | 8,702 | 8,503
Government agency |  |
Investment securities available for sale |  |
Without single maturity date, amortized cost | 79 | 120
Without single maturity date, fair value | 77 | 117
Residential mortgage-backed securities |  |
Investment securities available for sale |  |
Without single maturity date, amortized cost | 16,161 | 7,154
Without single maturity date, fair value | 15,620 | 6,686
Investment securities held to maturity |  |
Without single maturity date, amortized cost | 4,558 | 4,205
Without single maturity date, fair value | 3,878 | 3,561
Commercial mortgage-backed securities |  |
Investment securities available for sale |  |
Without single maturity date, amortized cost | 3,869 | 2,319
Without single maturity date, fair value | 3,666 | 2,131
Investment securities held to maturity |  |
Without single maturity date, amortized cost | 3,407 | 3,489
Without single maturity date, fair value | $ 2,729 | $ 2,875

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