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BASIS OF PRESENTATION (Details) - USD ($) $ in Millions |  | 3 Months Ended | 36 Months Ended |
--- | --- | --- | --- | ---
Jan. 01, 2020 | Mar. 31, 2020 | Mar. 31, 2019 | Jan. 01, 2025 | Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Retained earnings |  | $ 6,011 |  |  | $ 6,498
Income tax expense |  | 11 | $ 127 |  |
Allowance for credit loss | $ 1,747 | $ 2,210 |  |  | $ 1,296
Accounting Standards Update 2016-13 |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Basis point change in CET1 | (0.22%) |  |  |  |
Scenario, Forecast | Accounting Standards Update 2016-13 |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Basis point change in CET1 |  |  |  | (0.06%) |
Capital impact phase in percentage |  |  |  | 25.00% |
Cumulative Effect, Period Of Adoption, Adjustment | Accounting Standards Update 2016-13 |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Retained earnings | $ (337) |  |  |  |
Income tax expense | (114) |  |  |  |
Allowance for credit loss | $ 451 |  |  |  |

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