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INVESTMENT SECURITIES - Schedule of Amortized Cost and Fair Value of Securities, by Contractual Maturities (Details) - USD ($) $ in Millions | Dec. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Amortized Cost |  |
Available for sale, due in one year or less, amortized cost | $ 180 |
Available for sale, due after one year but within five years, amortized cost | 432 |
Available for sale, due after five years but within ten years, amortized cost | 95 |
Available for sale, due after ten years, amortized cost | 18 |
Available for sale, with contractual maturities, amortized cost | 725 |
Amortized Cost | 3,783 | $ 3,620
Fair Value |  |
Available for sale, due in one year or less, fair value | 181 |
Available for sale, due after one year but within five years, fair value | 433 |
Available for sale, due after five years but within ten years, fair value | 96 |
Available for sale, due after ten years, fair value | 17 |
Available for sale, with contractual maturities, fair value | 727 |
Fair Value | 3,727 | 3,466
Amortized Cost |  |
Held to maturity, due in one year or less, amortized cost | 4 |
Held to maturity, due after one year but within five years, amortized cost | 100 |
Held to maturity, due after five years but within ten years, amortized cost | 259 |
Held to maturity, due after ten years, amortized cost | 643 |
Held to maturity, with contractual maturities, amortized cost | 1,006 |
Amortized Cost | 4,117 | 3,979
Fair Value |  |
Held to maturity, due in one year or less, fair value | 4 |
Held to maturity, due after one year but within five years, fair value | 97 |
Held to maturity, due after five years but within ten years, fair value | 249 |
Held to maturity, due after ten years, fair value | 596 |
Held to maturity, with contractual maturities, fair value | 946 |
Fair Value | 3,941 | 3,644
Agency MBS |  |
Amortized Cost |  |
Available-for-sale, amortized cost | 801 |
Amortized Cost | 801 | 714
Fair Value |  |
Available for sale, fair value | 800 |
Fair Value | 800 | 694
Amortized Cost |  |
Held to maturity, amortized cost | 784 |
Amortized Cost | 784 | 901
Fair Value |  |
Held to maturity, fair value | 731 |
Fair Value | 731 | 806
Agency CMO |  |
Amortized Cost |  |
Available-for-sale, amortized cost | 662 |
Amortized Cost | 662 | 796
Fair Value |  |
Available for sale, fair value | 601 |
Fair Value | 601 | 698
Amortized Cost |  |
Held to maturity, amortized cost | 612 |
Amortized Cost | 612 | 714
Fair Value |  |
Held to maturity, fair value | 550 |
Fair Value | 550 | 619
Agency commercial MBS |  |
Amortized Cost |  |
Available-for-sale, amortized cost | 1,595 |
Amortized Cost | 1,595 | 1,420
Fair Value |  |
Available for sale, fair value | 1,599 |
Fair Value | 1,599 | 1,388
Amortized Cost |  |
Held to maturity, amortized cost | 1,715 |
Amortized Cost | 1,715 | 1,326
Fair Value |  |
Held to maturity, fair value | 1,714 |
Fair Value | $ 1,714 | $ 1,284

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