Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Other comprehensive (loss) income, net of tax:
Net loss	$ (234)	$ (38)	$ (39)
Foreign currency translation adjustments	33	(23)	(88)
Loss recognized from pension and postretirement benefits			0
Other comprehensive income (loss)	(31)	24	88
Comprehensive loss	(203)	(62)	(127)
Comprehensive income attributable to noncontrolling interest	0	0	(1)
Comprehensive loss attributable to Hexion Inc.	(203)	(62)	(128)
Parent [Member]
Other comprehensive (loss) income, net of tax:
Other comprehensive income (loss)	(31)	$ 24	88
Noncontrolling Interest [Member]
Other comprehensive (loss) income, net of tax:
Other comprehensive income (loss)	$ 0		$ 0