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INVESTMENT SECURITIES - Schedule of Investment Securities Maturity Information (Details) - USD ($) $ in Millions | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Investment securities available for sale |  |
Non-amortizing securities maturing in one year or less, cost | $ 5,995 | $ 5,674
Non-amortizing securities maturing in after one through five years, cost | 5,962 | 4,996
Non-amortizing securities maturing in after five through 10 years, cost | 382 | 408
Non-amortizing securities maturing in after 10 years, cost | 22 | 17
Amortized Cost | 27,959 | 20,688
Non-amortizing securities maturing in one year or less, fair value | 5,961 | 5,658
Non-amortizing securities maturing in after one through five years, fair value | 5,921 | 4,959
Non-amortizing securities maturing in after five through 10 years, fair value | 351 | 369
Non-amortizing securities maturing in after 10 years, fair value | 21 | 16
Investment securities available for sale, fair value | 27,053 | 19,936
Investment securities held to maturity |  |
Non-amortizing securities maturing in one year or less, cost | 27 | 27
Non-amortizing securities maturing in after one through five years, cost | 1,641 | 1,636
Non-amortizing securities maturing in after five through 10 years, cost | 624 | 622
Amortized Cost | 10,535 | 9,979
Non-amortizing securities maturing in one year or less, fair value | 26 | 26
Non-amortizing securities maturing in after one through five years, fair value | 1,514 | 1,508
Non-amortizing securities maturing in after five through 10 years, fair value | 531 | 533
Investment securities held to maturity, cost, fair value | 8,946 | 8,503
Government agency |  |
Investment securities available for sale |  |
Without single maturity date, cost | 99 | 120
Without single maturity date, fair value | 97 | 117
Residential mortgage-backed securities |  |
Investment securities available for sale |  |
Without single maturity date, cost | 12,561 | 7,154
Without single maturity date, fair value | 11,975 | 6,686
Investment securities held to maturity |  |
Without single maturity date, cost | 4,793 | 4,205
Without single maturity date, fair value | 4,093 | 3,561
Commercial mortgage-backed securities |  |
Investment securities available for sale |  |
Without single maturity date, cost | 2,938 | 2,319
Without single maturity date, fair value | 2,727 | 2,131
Investment securities held to maturity |  |
Without single maturity date, cost | 3,450 | 3,489
Without single maturity date, fair value | $ 2,782 | $ 2,875

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