COMMITMENTS AND CONTINGENCIES Litigation (Details) € in Millions, $ in Millions	3 Months Ended					9 Months Ended	12 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 30, 2019 EUR (€)	Dec. 31, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2016 USD ($)	Sep. 30, 2019 USD ($) Plaintiffs	Dec. 31, 2015 USD ($)	Sep. 30, 2014 USD ($)
Signature Industrial Services LLC et al. v. International Paper
Loss Contingencies [Line Items]
Loss Contingency, damages awarded, value			$ 137.0	$ 125.0
Disputed invoices, value								$ 1.0
Kalamazoo River Superfund Site | Time Critical Removal Action
Loss Contingencies [Line Items]
Loss contingency, damages sought, value					$ 37.0		$ 19.0
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						$ 50.0
Loss contingency, damages sought, value						$ 79.0
Responsible party percentage						15.00%
San Jacinto River Superfund Site
Loss Contingencies [Line Items]
Loss contingency, damages sought, value						$ 115.0
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
Italian Competition Authority [Member]
Loss Contingencies [Line Items]
Loss contingency, damages sought, value	$ 32.0	€ 29.0
Potentially Responsible Parties	30	30