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FAIR VALUE MEASUREMENTS - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Other income | $ 89 | $ 67 | $ 89
Nonaccrual | 702 | 1,019 |
Commercial |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Nonaccrual | $ 183 | $ 458 |

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