Divestitures Divestitures (Reconciliation of Major Line Items Constituting Pre-Tax Profit (Loss) of Discontinued Operations) (Details) - USD ($) $ in Millions	3 Months Ended																12 Months Ended
	Dec. 31, 2018	[1]	Sep. 30, 2018	[1]	Jun. 30, 2018	[1]	Mar. 31, 2018	[1]	Dec. 31, 2017	[2]	Sep. 30, 2017	[2]	Jun. 30, 2017	[2]	Mar. 31, 2017	[2]	Dec. 31, 2018		Dec. 31, 2017		Dec. 31, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net gain on transfer of North American Consumer Packaging business																	$ (488)		$ 0		$ 0
Discontinued operations, net of taxes	$ 0		$ 0		$ (23)		$ 368		$ (8)		$ 29		$ (4)		$ 17		345	[1]	34	[2]	102
North American Consumer Packaging [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net gain on transfer of North American Consumer Packaging business																	(488)
North American Consumer Packaging [Member] | Discontinued Operations, Held-for-sale [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net Sales																	0		1,559		1,584
Cost of products sold																	0		1,179		1,095
Selling and administrative expenses																	25		110		91
Depreciation, amortization and cost of timber harvested																	0		80		103
Distribution expenses																	0		126		124
Taxes other than payroll and income taxes																	0		11		10
Net gain on transfer of North American Consumer Packaging business																	(488)		0		0
Interest expense, net																	0		1		0
Earnings (Loss) Before Income Taxes and Equity Earnings																	463		52		161
Income tax provision (benefit)																	118		18		54
Discontinued operations, net of taxes																	$ 345		$ 34		$ 107

[1] Includes the following pre-tax charges (gains): 2018In millions Q1 Q2 Q3 Q4North American Consumer Packaging transaction costs $23 $2 $— $—North American Consumer Packaging gain on transfer (516) 28 — —Total $(493) $30 $— $—

[2] ncludes the operating earnings of the North American Consumer Packaging business for the full year. Also includes the following pre-tax charges (gains): 2017In millions Q1 Q2 Q3 Q4North American Consumer Packaging transaction costs $— $— $— $17Non-operating pension expense — — — 45Total $— $— $— $62