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SECURITIES - Narrative (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items] |  |  |
Purchases of debt securities available for sale | $ 9,271,000,000 | $ 8,422,000,000 | $ 4,270,000,000
Accrued interest receivable on debt securities | 55,000,000 | 58,000,000 |
Taxable interest income from investment securities | $ 519,000,000 | 642,000,000 | 672,000,000
Held-to-maturity, zero expected credit loss, percent of portfolio | 72.00% |  |
Held-to-maturity, expected credit loss, percent of portfolio | 28.00% |  |
Held-to-maturity, allowance for credit loss | $ 0 |  |
Retail | Education |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Sale of loans | 1,100,000,000 |  |
Mortgage-backed securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Securitizations of mortgage loans | 144,000,000 | $ 150,000,000 | $ 142,000,000
Asset-backed securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Purchases of debt securities available for sale | $ 893,000,000 |  |

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