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EQUITY METHOD INVESTMENTS Narrative (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Sep. 30, 2019
USD ($)
Mar. 31, 2019
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Schedule of Equity Method Investments [Line Items]              
Proceeds from sales of equity method investments         $ 500 $ 0  
Equity earnings (loss), net of taxes $ (28)   $ 27   13 221  
Equity method dividends received         $ 158 260  
Reportable Subsegments | Graphic Packaging LLC [Member]              
Schedule of Equity Method Investments [Line Items]              
Percentage of equity interest 14.80%     20.50% 14.80%    
Proceeds from sales of equity method investments $ 250 $ 250          
Gain (Loss) on Sale of Equity Investments   33          
Gain (loss) on sale of equity method investment, net of tax   $ 25          
Equity earnings (loss), net of taxes 11   10   $ 29 37  
Equity method investments 693       693   $ 1,100
Equity method investment, difference between carrying amount and underlying equity 347       347   529
Revenue from related parties $ 60   69   190 212  
Equity method dividends received         $ 16 20  
Equity method investments, aggregate units exchanged 17,399,414 15,150,784   79,911,511      
Reportable Subsegments | Ilim Holding              
Schedule of Equity Method Investments [Line Items]              
Percentage of equity interest 50.00%       50.00%    
Equity earnings (loss), net of taxes $ (33)   18   $ (5) 186  
Equity method investments 322       322   508
Equity method investment, difference between carrying amount and underlying equity 126       126   $ 136
Related party transaction, purchases from related party $ 41   $ 51   131 162  
Equity method dividends received         $ 141 $ 239