EQUITY METHOD INVESTMENTS GPI Transactions (Details) $ in Millions	3 Months Ended				12 Months Ended
	Jun. 30, 2021 USD ($)	Mar. 31, 2021 USD ($)	Sep. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018
EQUITY METHOD INVESTMENTS GPI Transactions (Details) [Line Items]
Proceeds from sales of equity method investments					$ 908	$ 500	$ 0
Net (gains) losses on sales of equity method investments					$ 204	$ 35	$ 0
Graphic Packaging LLC [Member] | Reportable Subsegments [Member]
EQUITY METHOD INVESTMENTS GPI Transactions (Details) [Line Items]
Proceeds from sales of equity method investments	$ 403	$ 397	$ 250	$ 250
Graphic Packaging LLC [Member] | Reportable Subsegments [Member]
EQUITY METHOD INVESTMENTS GPI Transactions (Details) [Line Items]
Equity method investments, aggregate units exchanged			17,399,414	15,150,784				79,911,591
Equity method investments, aggregate units exchanged and sold on open market	22,773,077	24,588,316
Net (gains) losses on sales of equity method investments	$ 64	$ 33	$ 0	$ 33
Gain (loss) on disposition of stock in subsidiary or equity method investee, net of tax	48	25	$ 0	$ 25
Gain related to tax receivable agreement	66	42
Gain related to tax receivable agreement, net of tax	$ 50	$ 31