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INVESTMENT SECURITIES - Schedule of Amortized Cost and Fair Value of Securities, by Contractual Maturities (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Amortized Cost |  |
Available for sale, due in one year or less, amortized cost | $ 206 |
Available for sale, due after one year but within five years, amortized cost | 424 |
Available for sale, due after five years but within ten years, amortized cost | 62 |
Available for sale, due after ten years, amortized cost | 21 |
Available for sale, with contractual maturities, amortized cost | 713 |
Amortized Cost | 3,690 | $ 3,620
Fair Value |  |
Available for sale, due in one year or less, fair value | 206 |
Available for sale, due after one year but within five years, fair value | 425 |
Available for sale, due after five years but within ten years, fair value | 63 |
Available for sale, due after ten years, fair value | 20 |
Available for sale, with contractual maturities, fair value | 714 |
Fair Value | 3,620 | 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 | 89 |
Held to maturity, due after five years but within ten years, amortized cost | 239 |
Held to maturity, due after ten years, amortized cost | 664 |
Held to maturity, with contractual maturities, amortized cost | 996 |
Amortized Cost | 4,049 | 3,979
Fair Value |  |
Held to maturity, due in one year or less, fair value | 5 |
Held to maturity, due after one year but within five years, fair value | 86 |
Held to maturity, due after five years but within ten years, fair value | 229 |
Held to maturity, due after ten years, fair value | 599 |
Held to maturity, with contractual maturities, fair value | 919 |
Fair Value | 3,838 | 3,644
Agency MBS |  |
Amortized Cost |  |
Available-for-sale, amortized cost | 773 |
Amortized Cost | 773 | 714
Fair Value |  |
Available for sale, fair value | 770 |
Fair Value | 770 | 694
Amortized Cost |  |
Held to maturity, amortized cost | 821 |
Amortized Cost | 821 | 901
Fair Value |  |
Held to maturity, fair value | 761 |
Fair Value | 761 | 806
Agency CMO |  |
Amortized Cost |  |
Available-for-sale, amortized cost | 694 |
Amortized Cost | 694 | 796
Fair Value |  |
Available for sale, fair value | 626 |
Fair Value | 626 | 698
Amortized Cost |  |
Held to maturity, amortized cost | 637 |
Amortized Cost | 637 | 714
Fair Value |  |
Held to maturity, fair value | 569 |
Fair Value | 569 | 619
Agency commercial MBS |  |
Amortized Cost |  |
Available-for-sale, amortized cost | 1,510 |
Amortized Cost | 1,510 | 1,420
Fair Value |  |
Available for sale, fair value | 1,510 |
Fair Value | 1,510 | 1,388
Amortized Cost |  |
Held to maturity, amortized cost | 1,595 |
Amortized Cost | 1,595 | 1,326
Fair Value |  |
Held to maturity, fair value | 1,589 |
Fair Value | $ 1,589 | $ 1,284

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