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BASIS OF PRESENTATION - Narrative (Details) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Jan. 01, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Retained earnings |  | $ (6,445) | $ (6,498) |
Income tax expense |  | (241) | (460) | $ (462)
Allowance for credit losses |  | $ 2,443 | $ 1,252 |
Accounting Standards Update 2016-13 | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Retained earnings | $ 337 |  |  |
Income tax expense | 114 |  |  |
Allowance for credit losses | $ 451 |  |  |

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