Condensed Consolidated Statements of Operations - USD ($) $ in Millions		3 Months Ended		6 Months Ended	9 Months Ended
	Jul. 01, 2019	Sep. 30, 2019	Sep. 30, 2018	Jun. 30, 2019	Sep. 30, 2018
Net sales	$ 0	$ 836	$ 952	$ 1,778	$ 2,893
Selling, general and administrative expense (see Note 2)	0	69	68	145	217
Depreciation and amortization	0	55	27	52	85
Cost of Goods and Service, Excluding Depreciation, Depletion, and Amortization	0	710	773	1,462	2,343
Gain on disposition	0	0	0	0	44
Asset impairments	0	0	3	0	28
Business realignment costs	0	13	5	15	19
Other operating expense, net	0	(5)	(6)	(16)	(26)
Operating (loss) income	0	(16)	70	88	219
Interest expense, net	0	(28)	(83)	(89)	(250)
Other non-operating expense (income), net	0	(4)	1	11	(6)
Reorganization Items	(3,261)	0	0	(3,105)	0
(Loss) income before income tax and earnings from unconsolidated entities	3,261	(48)	(12)	3,115	(37)
Income tax (benefit) expense	207	(4)	6	222	17
(Loss) income before earnings from unconsolidated entities	3,054	(44)	(18)	2,893	(54)
Earnings from unconsolidated entities, net of taxes	0	1	0	2	2
Net loss	3,054	(43)	(18)	2,895	(52)
Net income attributable to noncontrolling interest	0	0	0	1	1
Net loss attributable to Hexion Inc.	3,054	(43)	(18)	2,894	(53)
Accumulated Deficit [Member]
Net loss	$ 3,054	(43)	$ (18)	$ (160)	$ (53)
Net loss attributable to Hexion Inc.		$ (43)