TIMBERLAND ACQUISITIONS AND DIVESTITURES - Additional Information (Details) $ in Millions	Jul. 07, 2021 USD ($)	Apr. 30, 2021 a	Feb. 25, 2021 USD ($) a	Mar. 26, 2020 USD ($)	Dec. 17, 2019 a	Jun. 30, 2021 USD ($)	Apr. 27, 2021 USD ($)	Dec. 31, 2020 USD ($)
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Assets held for sale (Note 14)						$ 229		$ 0
Washington
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Area of timberlands agreed to be sold | a		145,000
Assets held for sale (Note 14)						$ 229
Washington | Subsequent Event
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Proceeds from disposition of operations	$ 261
Gain on sale of discontinued operations	$ 30
ALABAMA
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Area of timberlands agreed to be purchased | a			69,200
Payments to acquire timberlands			$ 149
Timberlands acquisition, timber and timberlands at cost, less depletion							$ 148
Timberlands acquisition, property and equipment, net							$ 1
Montana
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Area of timberlands agreed to be sold | a					630,000
Proceeds from disposition of operations				$ 145