COMMITMENTS AND CONTINGENCIES Environmental Remediation Obligations (Details) - USD ($)	3 Months Ended			6 Months Ended
	Mar. 31, 2020	Dec. 31, 2017	Mar. 31, 2016	Jun. 30, 2018	Jun. 30, 2016	Mar. 31, 2023	Dec. 31, 2022	Dec. 31, 2020	Dec. 31, 2019
Loss Contingencies [Line Items]
Accrual for environmental loss contingencies						$ 240,000,000
Accrual for environmental loss contingencies, gross						248,000,000
Liability for Asbestos and Environmental Claims, Net						107,000,000	$ 105,000,000
Cass Lake, Minnesota
Loss Contingencies [Line Items]
Accrual for environmental loss contingencies						46,000,000
Kalamazoo River Superfund Site
Loss Contingencies [Line Items]
Proposed consent decree, value of remediation payments									$ 100,000,000
Proposed consent decree, value of labor performed									$ 136,000,000
Liability for Asbestos and Environmental Claims, Net						37,000,000	37,000,000
Kalamazoo River Superfund Site | Time Critical Removal Action
Loss Contingencies [Line Items]
Loss contingency, damages sought, value			$ 19,000,000		$ 37,000,000
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 sought, value				$ 79,000,000
Responsible party percentage				15.00%
Loss Contingency, damages awarded, value				$ 50,000,000
San Jacinto River Superfund Site
Loss Contingencies [Line Items]
Loss contingency, damages sought, value		$ 115,000,000
Responsible party percentage	50.00%
Liability for Asbestos and Environmental Claims, Net						$ 95,000,000	$ 95,000,000
San Jacinto River Superfund Site | Northern impoundment [Member]
Loss Contingencies [Line Items]
Loss contingency, damages sought, value		$ 105,000,000
Liability for Asbestos and Environmental Claims, Net								$ 55,000,000
San Jacinto River Superfund Site | Southern Impoundment [Member]
Loss Contingencies [Line Items]
Liability for Asbestos and Environmental Claims, Net	$ 10,000,000