COMMITMENTS AND CONTINGENCIES Litigation (Details) $ in Millions	3 Months Ended			6 Months Ended	12 Months Ended
	Dec. 31, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2016 USD ($)	Jun. 30, 2019 USD ($) Plaintiffs	Dec. 31, 2015 USD ($)
Signature Industrial Services LLC et al. v. International Paper
Loss Contingencies [Line Items]
Disputed invoices, value				$ 1
Loss Contingency, damages awarded, value	$ 137	$ 125
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