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Equity Method Investments (Narrative) (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Jan. 29, 2020
Schedule of Equity Method Investments [Line Items]          
Equity earnings (loss), net of taxes   $ 250,000,000 $ 336,000,000 $ 177,000,000  
Reportable Subsegments [Member] | Graphic Packaging LLC [Member]          
Schedule of Equity Method Investments [Line Items]          
Percentage of equity interest   21.60% 20.50%   18.30%
Equity earnings (loss), net of taxes   $ 46,000,000 $ 46,000,000    
Dividends received from equity method investee   27,000,000 25,000,000    
Equity method investments   1,100,000,000 1,100,000,000    
Equity method investment, difference between carrying amount and underlying equity   529,000,000 562,000,000    
Revenue from related party   $ 274,000,000 240,000,000    
Equity method investment, aggregate units exchanged 19.00%        
Proceeds from exchange of aggregate units owned in an equity method investment $ 250,000,000        
Reportable Subsegments [Member] | Ilim Holding [Member]          
Schedule of Equity Method Investments [Line Items]          
Percentage of equity interest   50.00%      
Equity earnings (loss), net of taxes   $ 207,000,000 290,000,000 183,000,000  
Dividends received from equity method investee   246,000,000 128,000,000    
Equity method investments   508,000,000 478,000,000    
Equity method investment, difference between carrying amount and underlying equity   136,000,000 145,000,000    
Foreign currency transaction gain (loss), net of tax   32,000,000 (82,000,000) 15,000,000  
Purchases from related party   $ 215,000,000 $ 214,000,000 $ 205,000,000