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RESTRUCTURING AND OTHER CHARGES Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2019
Sep. 30, 2019
Sep. 30, 2018
Restructuring Cost and Reserve [Line Items]                
Restructuring and other charges, net $ 21 $ 0 $ 0     $ 0 $ 21 $ 48
Corporate and Other [Member]                
Restructuring Cost and Reserve [Line Items]                
Severance costs 11              
Printing Papers                
Restructuring Cost and Reserve [Line Items]                
Severance costs 6              
Global Cellulose Fibers [Member]                
Restructuring Cost and Reserve [Line Items]                
Severance costs $ 4              
EMEA Industrial Packaging [Member]                
Restructuring Cost and Reserve [Line Items]                
Severance costs       $ 12        
Restructuring and other charges, net       26 $ 22      
Restructuring and related cost, accelerated depreciation       6        
Restructuring and other related charges, accelerated amortization and other noncash costs       2        
Other restructuring costs       $ 6