INVENTORIES - Inventories as of the End of Our Last Two Years (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Inventory [Line Items]
Total	$ 383	$ 358
Logs
Inventory [Line Items]
LIFO inventories	17	18
FIFO or moving average cost inventories	38	21
Lumber, plywood, panels, and fiberboard
Inventory [Line Items]
LIFO inventories	66	61
Lumber, plywood, panels, fiberboard and engineered wood products
Inventory [Line Items]
FIFO or moving average cost inventories	91	73
Other products
Inventory [Line Items]
LIFO inventories	10	10
FIFO or moving average cost inventories	77	90
Materials and supplies
Inventory [Line Items]
FIFO or moving average cost inventories	$ 84	$ 85