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INCOME TAXES (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Income Tax Examination [Line Items] |  |  |  |
Income tax provision (benefit) | $ 28 | $ 12 | $ 91 | $ 25
Effective income tax rate reconciliation, percent | 23.90% | 18.50% | 25.50% | 18.80%
Income tax examination, estimate of possible loss |  |  | $ 107 |
Income tax examination, penalties and interest expense |  |  | $ 351 |
Income tax examination, tax liabilities payable, percentage | 40.00% |  | 40.00% |
Income tax examination, tax liability, threshold | $ 300 |  | $ 300 |
International Paper |  |  |  |
Income Tax Examination [Line Items] |  |  |  |
Income tax examination, tax liabilities payable, percentage | 60.00% |  | 60.00% |

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