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SECURITIES - Narrative (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items] |  |  |
Accrued interest receivable on debt securities | $ 125,000,000 | $ 107,000,000 |
Taxable interest income from investment securities | 1,200,000,000 | 840,000,000 | $ 487,000,000
Offsetting of short-term receivables or payables recognized | $ 0 | 0 |
Held-to-maturity, zero expected credit loss, percent of portfolio | 95.00% |  |
Total mortgage-backed securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Securitizations of mortgage loans | $ 102,000,000 | $ 143,000,000 |

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