Acquisitions And Joint Ventures (Schedule of Recognized Identified Assets Acquired and Liabilities Assumed) (Details) - USD ($) $ in Millions	Dec. 31, 2017	Jun. 30, 2017	Dec. 31, 2016	Dec. 01, 2016	Jun. 30, 2016	Dec. 31, 2015
Business Acquisition [Line Items]
Goodwill	$ 3,411		$ 3,364			$ 3,335
Tangier, Morocco Facility [Member]
Business Acquisition [Line Items]
Cash and temporary investments		$ 1
Accounts and notes receivable		7
Inventory		3
Plants, properties and equipment		32
Goodwill		4
Other intangible assets		5
Deferred charges and other assets		4
Total assets acquired		56
Accounts payable and accrued liabilities		5
Long-term debt		11
Other long-term liabilities		2
Total liabilities assumed		18
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