ACQUISITIONS Business Combination, Schedule of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016	Dec. 01, 2016
Business Acquisition [Line Items]
Goodwill	$ 3,402	$ 3,364
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			47
Other intangible assets			212
Deferred charges and other assets			6
Total assets acquired			2,432
Accounts payable and accrued liabilities			111
Long-term debt			104
Other long-term liabilities			26
Total liabilities assumed			241
Net assets acquired			$ 2,191