Acquisitions And Joint Ventures (Identifiable Intangible Assets Acquired In Connection With Acquisition) (Details) - Weyerhaeuser Pulp Business [Member] $ in Millions	12 Months Ended
	Dec. 31, 2016 USD ($)
Business Acquisition [Line Items]
Finite-lived intangible assets acquired	$ 212
Customer relationships and lists
Business Acquisition [Line Items]
Finite-lived intangible assets acquired	$ 95
Average Remaining Useful Life	24 years
Trade names, patents, trademarks and developed technology
Business Acquisition [Line Items]
Finite-lived intangible assets acquired	$ 113
Average Remaining Useful Life	8 years
Other
Business Acquisition [Line Items]
Finite-lived intangible assets acquired	$ 4
Average Remaining Useful Life	10 years