Acquisitions (Narrative) (Details) € in Millions	3 Months Ended		12 Months Ended
	Dec. 31, 2021 USD ($)	Dec. 31, 2021 EUR (€)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Jun. 30, 2021 USD ($)	Apr. 01, 2021 USD ($)
Business Acquisition [Line Items]
Contract with Customer, Liability							$ 115,000,000
Payments to acquire businesses, net of cash acquired			$ 80,000,000	$ 65,000,000	$ 103,000,000
Spain Box Plants
Business Acquisition [Line Items]
Business combination, aggregate purchase price	$ 83,000,000	€ 71
Net sales since acquisition date	28,000,000
Earnings (loss) from continuing operations before income taxes and equity earnings since acquisition date	$ 1,000,000
Corrugated Packaging Business
Business Acquisition [Line Items]
Acquisition costs, amortization period	15 years	15 years
Contract with Customer, Liability						$ 115,000,000
Corrugated Sheet Plant [Member]
Business Acquisition [Line Items]
Payments to acquire businesses, net of cash acquired				$ 56,000,000