OTHER OPERATING COSTS (INCOME), NET - Items Included in Other Operating (Costs) Income, Net (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Gain on dispositions of nonstrategic assets	$ (1)	$ (1)	$ (7)	$ (25)
Foreign exchange losses, net	20	13	41	15
Land management income	(9)	(9)	(27)	(25)
Other, net	11	(3)	14	(15)
Total other operating costs (income), net	21	(23)	21	(163)
U.S. and Canadian Other Postretirement Plans
Gain on postretirement plan amendment (Note 6)	$ 0	$ (23)	$ 0	$ (113)