INVENTORIES - Inventories (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Inventory [Line Items]
Total	$ 499	$ 443
Logs
Inventory [Line Items]
LIFO inventories	17	24
Moving average cost or FIFO inventories	67	64
Lumber, plywood, panels and fiberboard
Inventory [Line Items]
LIFO inventories	80	59
Lumber, plywood, panels, fiberboard and engineered wood products
Inventory [Line Items]
Moving average cost or FIFO inventories	104	84
Other products
Inventory [Line Items]
LIFO inventories	10	9
Moving average cost or FIFO inventories	109	100
Materials and supplies
Inventory [Line Items]
Moving average cost or FIFO inventories	$ 112	$ 103