OTHER OPERATING COSTS (INCOME), NET - Various Income and Expense Items Included in Other Operating Costs (Income), Net (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Gain on disposition of nonstrategic assets (1)	$ 36	$ (5)	$ (16)	$ (60)
Foreign exchange losses (gains), net (2)		(3)	(1)	(6)
Litigation expense, net		35	20	24
Gain on sale of timberlands (3)		0	(99)	0
Environmental remediation insurance recoveries		(5)	(42)	0
Other, net(4)		52	10	(11)
Total other operating costs (income), net		$ 74	$ (128)	$ (53)