ACQUISITIONS Schedule of Finite-Lived Assets Acquired As Part of a Business Combination (Details) - Weyerhaeuser Pulp Business $ in Millions	3 Months Ended
	Dec. 31, 2016 USD ($)
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets acquired	$ 212
Customer relationships and lists
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets acquired	$ 95
Acquired finite-lived intangible assets, weighted average useful life	24 years
Tradenames, patents and trademarks, and developed technology
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets acquired	$ 113
Acquired finite-lived intangible assets, weighted average useful life	8 years
Other
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets acquired	$ 4
Acquired finite-lived intangible assets, weighted average useful life	10 years