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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