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SECURITIES - Narrative (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items] |  |  |
Accrued interest receivable on debt securities | $ 56,000,000 |  | $ 55,000,000
Taxable interest income from securities | 128,000,000 | $ 147,000,000 |
Offsetting of short-term receivables or payables recognized | 0 |  | $ 0
Purchases of debt securities available for sale | $ 4,256,000,000 | 2,102,000,000 |
Held-to-maturity, zero expected credit loss, percent of portfolio | 71.00% |  |
Held-to-maturity, expected credit loss, percent of portfolio | 29.00% |  |
Mortgage-backed securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Securitizations of mortgage loans | $ 81,000,000 | $ 0 |

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