Equity Method Investments (Narrative) (Details) $ in Millions	3 Months Ended		12 Months Ended
	Sep. 30, 2020	Mar. 31, 2020	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018
Schedule of Equity Method Investments [Line Items]
Equity earnings (loss), net of taxes			$ 313	$ 77	$ 250
Equity method dividends received			159	162	273
Total Current Assets			7,096	11,236
Graphic Packaging LLC [Member] | Reportable Subsegments [Member]
Schedule of Equity Method Investments [Line Items]
Equity method dividends received			5	20	27
Reportable Subsegments [Member] | Graphic Packaging LLC [Member]
Schedule of Equity Method Investments [Line Items]
Percentage of equity interest						20.50%
Equity method investments, aggregate units exchanged	17,399,414	15,150,784				79,911,591
Equity earnings (loss), net of taxes			$ 4	40	46
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			$ 311	48	207
Equity method dividends received			154	141	246
Foreign currency transaction gain (loss), net of tax				(50)	32
Equity method investments			557	393
Equity method investment, difference between carrying amount and underlying equity			121	127
Purchases from related party			$ 125	$ 174	$ 215