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, 2017	[1]	Sep. 30, 2017	[1]	Jun. 30, 2017	[1]	Mar. 31, 2017	[1]	Dec. 31, 2016	[2]	Sep. 30, 2016	[2]	Jun. 30, 2016	[2]	Mar. 31, 2016	[2]	Dec. 31, 2017		Dec. 31, 2016		Dec. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Discontinued operations, net of taxes	$ (8)		$ 29		$ (4)		$ 17		$ 24		$ 34		$ 40		$ 4		$ 34	[1]	$ 102	[2]	$ 85
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																	1,559		1,584		1,690
Cost of products sold																	1,179		1,095		1,155
Selling and administrative expenses																	110		91		106
Depreciation, amortization and cost of timber harvested																	80		103		127
Distribution expenses																	126		124		158
Taxes other than payroll and income taxes																	11		10		10
Interest expense, net																	1		0		0
Earnings (Loss) Before Income Taxes and Equity Earnings																	52		161		134
Income tax provision (benefit)																	18		54		49
Discontinued operations, net of taxes																	$ 34		$ 107		$ 85

[1] Includes 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

[2] Includes the operating earnings of the North American Consumer Packaging business for the full year and a pre-tax charge of $8 million for a legal settlement associated with the xpedx business.