INVENTORIES - Inventories (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Inventory [Line Items]
Total	$ 499	$ 443
Logs
Inventory [Line Items]
LIFO inventories	22	24
Moving average cost or FIFO inventories	52	64
Lumber, plywood, panels and fiberboard
Inventory [Line Items]
LIFO inventories	64	59
Lumber, plywood, panels, fiberboard and engineered wood products
Inventory [Line Items]
Moving average cost or FIFO inventories	113	84
Other products
Inventory [Line Items]
LIFO inventories	13	9
Moving average cost or FIFO inventories	121	100
Materials and supplies
Inventory [Line Items]
Moving average cost or FIFO inventories	$ 114	$ 103