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Interim Financial Results (Footnotes) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Business Acquisition [Line Items]
Restructuring and other charges, net									$ 509.0	$ 195.0	$ 51.0
Loss Contingency Accrual, Provision	$ (5.0)
Environmental remediation reserve adjustment		$ 5.0	$ 5.0			$ 0.0		$ 41.0
Net (gains) losses on sales of equity method investments									204.0	35.0	0.0
Net (gains) losses on sales and impairments of businesses									7.0	(465.0)	(205.0)
Net (gains) losses on mark to market investments	32.0								32.0	0.0	0.0
Asset Impairment Charges			21.0
Other items	1.0	9.0	11.0		$ 0.0	1.0	$ 0.0	(3.0)
Non-operating pension (income) expense	(47.0)	(50.0)	(51.0)	$ (52.0)	(10.0)	(11.0)	(14.0)	(6.0)	(200.0)	(41.0)	36.0
Asbestos litigation reserve adjustment							43.0
Abandoned property removal							5.0	9.0
Pre-tax charges (gains)	248.0	(1.0)	17.0	(94.0)	178.0	91.0	54.0	378.0
Non-operating pension expense (income), tax	(11.0)	(12.0)	(13.0)	(13.0)	(2.0)	(4.0)	(3.0)	(1.0)
Tax benefit related to settlement of tax audits					(23.0)
Other Tax Expense (Benefit)	(62.0)	0.0	(1.0)	25.0	(37.0)	(20.0)	(15.0)	(11.0)
Tax impact of other special items	(73.0)	(12.0)	(14.0)	12.0	(16.0)	(24.0)	(18.0)	(12.0)
Net (gains) losses on sales and impairments of businesses									358.0	(465.0)	(205.0)
Increase (Decrease) in Income Taxes Receivable			70.0
Graphic Packaging LLC [Member] \| Reportable Subsegments [Member]
Business Acquisition [Line Items]
Net (gains) losses on sales of equity method investments			(130.0)	(74.0)				(33.0)
Printing Papers [Member]
Business Acquisition [Line Items]
Environmental remediation reserve adjustment						6.0
Other items					3.0	(1.0)
Non-operating pension (income) expense		0.0	(1.0)	(1.0)
Pre-tax charges (gains)	8.0	(331.0)	(28.0)	19.0	2.0	5.0	0.0	0.0
Printing Papers spin-off expenses	5.0	47.0	20.0	20.0	8.0
Tax benefit related to settlement of tax audits	(3.0)	27.0			(9.0)
Net (gains) losses on sales of fixed assets		(65.0)
Increase (Decrease) in Income Taxes Receivable		10.0	(47.0)
Printing Papers [Member] \| Discontinued Operations, Disposed of by Means Other than Sale, Spinoff [Member]
Business Acquisition [Line Items]
Net (gains) losses on sales of fixed assets									(86.0)	0.0	0.0
Kwidzyn Mill [Member]
Business Acquisition [Line Items]
Net (gains) losses on sales and impairments of businesses		(350.0)
Divestiture costs	6.0
Kwidzyn Mill [Member] \| Discontinued Operations, Held-for-sale or Disposed of by Sale
Business Acquisition [Line Items]
Net (gains) losses on sales and impairments of businesses		404.0
Net (gains) losses on sales and impairments of businesses		360.0
Divestiture costs	9.0
Olmuksan [Member]
Business Acquisition [Line Items]
Net (gains) losses on sales and impairments of businesses			9.0	(2.0)	(123.0)
Brazil Industrial Packaging Total
Business Acquisition [Line Items]
Net (gains) losses on sales and impairments of businesses					0.0	4.0	(8.0)	(344.0)
APPM [Member]
Business Acquisition [Line Items]
Net (gains) losses on sales and impairments of businesses							6.0	(17.0)
Riverdale mill conversion
Business Acquisition [Line Items]
Restructuring and other charges, net								1.0
Early debt extinguishment costs (see Note 13)
Business Acquisition [Line Items]
Restructuring and other charges, net	238.0	$ 35.0	170.0	18.0	$ 65.0	$ 105.0	$ 18.0	$ 8.0	461.0	$ 196.0	21.0
EMEA packaging restructuring
Business Acquisition [Line Items]
Restructuring and other charges, net				$ 12.0					12.0		15.0
Overhead cost reduction initiative
Business Acquisition [Line Items]
Restructuring and other charges, net											$ 15.0
Building a Better IP
Business Acquisition [Line Items]
Restructuring and other charges, net	$ 29.0		$ 0.0						$ 29.0