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Subsequent Events (Narrative) (Details)
€ in Millions, $ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2021
USD ($)
shares
Mar. 31, 2021
EUR (€)
shares
Mar. 31, 2020
USD ($)
Dec. 31, 2020
Printing Papers        
Subsequent Event [Line Items]        
Percentage of ownership retained       19.90%
Subsequent Event [Member] | Kwidzyn Mill [Member]        
Subsequent Event [Line Items]        
Proceeds from Divestiture of Businesses $ 812 € 670    
Graphic Packaging LLC [Member] | Reportable Subsegments [Member]        
Subsequent Event [Line Items]        
Equity method investment, aggregate units exchanged     15,150,784  
Proceeds from exchange of aggregate units owned in an equity method investment     $ 250  
Graphic Packaging LLC [Member] | Reportable Subsegments [Member] | Subsequent Event [Member]        
Subsequent Event [Line Items]        
Shares received from exchange of units owned in equity method investee | shares 15,307,000 15,307,000    
Equity method investment, aggregate units exchanged 15,307,000 15,307,000    
Proceeds from Sale of Other Assets $ 247      
Proceeds from exchange of aggregate units owned in an equity method investment $ 150      
Equity method investment, shares repurchased by parent 9,281,316 9,281,316