Consolidated Statement of Equity (Deficit) - USD ($) $ in Millions	Total	Common Stock [Member]	Paid-in Capital [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Income [Member]	Accumulated Deficit [Member]	Total Hexion Inc. Deficit [Member]	Noncontrolling Interest [Member]
Balance at Dec. 31, 2014	$ (2,350)	$ 1	$ 526	$ (296)	$ 73	$ (2,652)	$ (2,348)	$ (2)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	(40)	0	0	0	0	(40)	(40)
Net loss	(39)
Net Income (Loss) Attributable to Noncontrolling Interest	1							1
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent		0	0	0		0
Other comprehensive loss	(88)				(88)		(88)	0
Balance at Dec. 31, 2015	(2,477)	1	526	(296)	(15)	(2,692)	(2,476)	(1)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	(38)	0	0	0	0	(38)	(38)
Net loss	(38)
Net Income (Loss) Attributable to Noncontrolling Interest	0							0
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent		0	0	0	(24)	0	(24)	0
Other comprehensive loss	(24)						(24)
Balance at Dec. 31, 2016	(2,539)	1	526	(296)	(39)	(2,730)	(2,538)	(1)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	(234)	0	0	0	0	(234)	(234)
Net loss	(234)
Net Income (Loss) Attributable to Noncontrolling Interest	0							0
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent		0	0	0		0
Other comprehensive loss	31				31		31	0
Balance at Dec. 31, 2017	$ (2,742)	$ 1	$ 526	$ (296)	$ (8)	$ (2,964)	$ (2,741)	$ (1)