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SECURITIES - Narrative (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Accrued interest receivable on debt securities | $ 57 | $ 57 |  | $ 57 |  | $ 58
Taxable interest income from securities |  | 121 | $ 153 | 398 | $ 483 |
Purchases of debt securities available for sale | 813 |  |  | 5,547 | 4,633 |
Mortgage-backed securities |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Securitizations of mortgage loans |  | 34 | $ 28 | 34 | $ 72 |
Retail | Education |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Sale of loans | $ 973 | $ 973 |  | $ 973 |  |

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