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RELATED PARTY TRANSACTIONS - Summary of Components of Net Transfers From (To) Parent (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Related Party Transaction [Line Items] |  |  |  |
Net transfers to Parent | $ (487) | $ (22) | $ (479) | $ (190)
Affiliated Entity | International Paper |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Net transfers to Parent | (487) | (22) | (479) | (190)
Affiliated Entity | General financing activities | International Paper |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Net transfers to Parent | (522) | (63) | (601) | (310)
Affiliated Entity | Corporate allocations | International Paper |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Net transfers to Parent | 32 | 37 | 112 | 109
Affiliated Entity | Stock-based compensation | International Paper |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Net transfers to Parent | $ 3 | $ 4 | $ 10 | $ 11

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