INVENTORIES - Inventories as of the End of Our Last Two Years (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Inventory [Line Items]
Total	$ 389	$ 383
Logs
Inventory [Line Items]
LIFO inventories	11	17
FIFO or moving average cost inventories	35	38
Lumber, plywood, panels, and fiberboard
Inventory [Line Items]
LIFO inventories	75	66
Lumber, plywood, panels, fiberboard and engineered wood products
Inventory [Line Items]
FIFO or moving average cost inventories	86	91
Other products
Inventory [Line Items]
LIFO inventories	10	10
FIFO or moving average cost inventories	83	77
Materials and supplies
Inventory [Line Items]
FIFO or moving average cost inventories	$ 89	$ 84