Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Other comprehensive (loss) income, net of tax:
Net loss	$ (163)	$ (234)	$ (38)
Foreign currency translation adjustments	(8)	33	(23)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, after Tax	(2)	(2)	(1)
Other comprehensive (loss) income	10	(31)	24
Comprehensive loss	(173)	(203)	(62)
Comprehensive loss attributable to noncontrolling interest	1	0	0
Comprehensive loss attributable to Hexion Inc.	(172)	(203)	(62)
Parent [Member]
Other comprehensive (loss) income, net of tax:
Other comprehensive (loss) income	10	$ (31)	24
Noncontrolling Interest [Member]
Other comprehensive (loss) income, net of tax:
Other comprehensive (loss) income	$ 0		$ 0