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FAIR VALUE MEASUREMENTS - Narrative (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Other income | $ 67,000,000 | $ 91,000,000 | $ 67,000,000
90+ days past due and accruing | 62,000,000 |  |
Nonaccrual loans and leases | 1,019,000,000 | 703,000,000 |
Commercial |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
90+ days past due and accruing | 21,000,000 |  |
Nonaccrual loans and leases | 458,000,000 | $ 245,000,000 |
Commercial | Commercial And Industrial, and Commercial Real Estate Loans Held For Sale |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
90+ days past due and accruing | 0 |  |
Nonaccrual loans and leases | $ 0 |  |

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