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ACQUISITIONS Narrative (Details)
€ in Millions, $ in Millions
3 Months Ended
Jun. 30, 2021
USD ($)
Mar. 31, 2021
USD ($)
Mar. 31, 2021
EUR (€)
Jun. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Apr. 01, 2021
USD ($)
Business Acquisition [Line Items]            
Acquisitions, net of cash acquired   $ 61     $ 0  
Freedom [Member]            
Business Acquisition [Line Items]            
Acquisitions, net of cash acquired       $ 56    
Spain Box Plants            
Business Acquisition [Line Items]            
Acquisitions, net of cash acquired   56        
Business combination, aggregate purchase price   $ 85 € 72      
Corrugated Packaging Business | Subsequent Event [Member]            
Business Acquisition [Line Items]            
Acquisition costs, amortization period 15 years          
Contract with Customer, Liability           $ 115
Noncontrolling Interest, Increase from Business Combination $ 115