COMMITMENTS AND CONTINGENCIES Litigation (Details) $ in Millions	3 Months Ended				6 Months Ended	12 Months Ended
	Mar. 31, 2019 USD ($) Plaintiffs	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Mar. 31, 2016 USD ($)	Jun. 30, 2016	Dec. 31, 2015 USD ($)
Ashley Furniture Lawsuit [Member]
Loss Contingencies [Line Items]
Loss Contingency, Number of Defendants					10
Signature Industrial Services LLC et al. v. International Paper
Loss Contingencies [Line Items]
Disputed invoices, value	$ 1
Loss Contingency, damages awarded, value		$ 125	$ 137
Kalamazoo River Superfund Site | Time Critical Removal Action
Loss Contingencies [Line Items]
Loss contingency, damages sought, value				$ 37		$ 19
Kalamazoo River Superfund Site | Georgia-Pacific Consumer Products LP, Fort James Corporation and Georgia Pacific LLC Cost Recovery Action
Loss Contingencies [Line Items]
Loss Contingency, damages awarded, value	$ 50
Responsible party percentage	15.00%
Loss contingency, damages sought, value	$ 79
San Jacinto River Superfund Site
Loss Contingencies [Line Items]
Loss contingency, damages sought, value	$ 115
Remediation design period	29 months
San Jacinto River Superfund Site | Medical Monitoring and Damages
Loss Contingencies [Line Items]
Number of plaintiffs seeking damages | Plaintiffs	600