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FAIR VALUE MEASUREMENTS - Schedule of Fair Value Measurements on a Nonrecurring Basis (Details) - Nonrecurring measurement basis - USD ($) $ in Millions | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Impaired collateral-dependent loans | $ 332 | $ 338
MSRs | 178 | 243
Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Impaired collateral-dependent loans | 0 | 0
MSRs | 0 | 0
Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Impaired collateral-dependent loans | 332 | 338
MSRs | 0 | 0
Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Impaired collateral-dependent loans | 0 | 0
MSRs | $ 178 | $ 243

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- Definition Fair value of impaired collateral-dependent loans net of impairments. + References No definition available. + Details
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- Definition Mortgage servicing rights + References No definition available. + Details
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