Document and Entity Information Document - shares	3 Months Ended
	Sep. 30, 2019	Sep. 30, 2019	Nov. 01, 2019
Document Information [Line Items]
Entity Registrant Name	Hexion Inc.
Entity Central Index Key	0000013239
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Document Type	10-Q
Document Period End Date	Sep. 30, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus		Q3
Amendment Flag	false
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Common Stock, Shares Outstanding			100
Entity Shell Company	false
Entity Current Reporting Status	Yes