Acquisitions And Joint Ventures (Schedule of Recognized Identified Assets Acquired and Liabilities Assumed) (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017	Jun. 30, 2017	Dec. 31, 2016	Dec. 01, 2016	Jun. 30, 2016
Business Acquisition [Line Items]
Goodwill	$ 3,374	$ 3,411		$ 3,364
Tangier, Morocco Facility [Member]
Business Acquisition [Line Items]
Cash and temporary investments			$ 1
Accounts and notes receivable			7
Inventory			3
Plants, properties and equipment			31
Goodwill			4
Other intangible assets			5
Deferred charges and other assets			4
Total assets acquired			55
Accounts payable and accrued liabilities			4
Long-term debt			11
Other long-term liabilities			2
Total liabilities assumed			17
Net assets acquired			$ 38
Weyerhaeuser Pulp Business [Member]
Business Acquisition [Line Items]
Cash and temporary investments					$ 12
Accounts and notes receivable					195
Inventory					238
Other current assets					11
Plants, properties and equipment					1,711
Goodwill					52
Other intangible assets					212
Deferred charges and other assets					6
Total assets acquired					2,437
Accounts payable and accrued liabilities					114
Long-term debt					104
Other long-term liabilities					28
Total liabilities assumed					246
Net assets acquired					$ 2,191
Holmen Paper Newsprint Mill [Member]
Business Acquisition [Line Items]
Current assets						$ 14
Equity method investments						14
Plants, properties and equipment						60
Deferred charges and other assets						5
Total assets acquired						93
Short-term liabilities						9
Long-term liabilities						16
Total liabilities assumed						25
Net assets acquired						$ 68