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FAIR VALUE MEASUREMENTS - Schedule of Fair Value Measurements on a Nonrecurring Basis (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Lessor operating lease assets | $ 761 | $ 791
Lessor operating lease assets |  | 92
Nonrecurring measurement basis |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Impaired collateral-dependent loans | 312 | 338
MSRs | 193 | 243
Lessor operating lease assets |  | 92
Level 1 | Nonrecurring measurement basis |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Impaired collateral-dependent loans | 0 | 0
MSRs | 0 | 0
Lessor operating lease assets |  | 0
Level 2 | Nonrecurring measurement basis |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Impaired collateral-dependent loans | 312 | 338
MSRs | 0 | 0
Lessor operating lease assets |  | 92
Level 3 | Nonrecurring measurement basis |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Impaired collateral-dependent loans | 0 | 0
MSRs | 193 | 243
Lessor operating lease assets |  | $ 0
Leased assets |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Lessor operating lease assets | 57 |
Leased assets | Nonrecurring measurement basis |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Lessor operating lease assets | 57 |
Leased assets | Level 1 | Nonrecurring measurement basis |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Lessor operating lease assets | 0 |
Leased assets | Level 2 | Nonrecurring measurement basis |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Lessor operating lease assets | 57 |
Leased assets | Level 3 | Nonrecurring measurement basis |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Lessor operating lease assets | $ 0 |

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