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BASIS OF PRESENTATION (Details) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 USD ($) termLoan | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) termLoan | Sep. 30, 2020 USD ($) | Oct. 01, 2021
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
General corporate expenses | $ 35 | $ 40 | $ 120 | $ 118 |
Long-term debt | $ 1,400 |  | $ 1,400 |  |
Number of term loans | termLoan | 2 |  | 2 |  |
International Paper | Special Payment |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Payment related to letter agreement | $ 1,520 |  |  |  |
Subsequent Event | International Paper | Sylvamo Corporation |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Ownership percentage by parent |  |  |  |  | 19.90%
Subsequent Event | International Paper |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Spinoff transaction, common stock distributed, percentage |  |  |  |  | 80.10%
Spinoff transaction, shares of parent exchanged for each share of company |  |  |  |  | 0.0909

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