INVENTORIES - Inventories (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Inventory [Line Items]
Total	$ 411	$ 416
Logs
Inventory [Line Items]
LIFO inventories	14	19
Moving average cost or FIFO inventories	49	28
Lumber, plywood, panels and fiberboard
Inventory [Line Items]
LIFO inventories	64	82
Lumber, plywood, panels, fiberboard and engineered wood products
Inventory [Line Items]
Moving average cost or FIFO inventories	74	84
Other products
Inventory [Line Items]
LIFO inventories	8	10
Moving average cost or FIFO inventories	98	98
Materials and supplies
Inventory [Line Items]
Moving average cost or FIFO inventories	$ 104	$ 95