Guarantor Non-Guarantor Subsidiary Financial Information (Details) - Consolidating Statement of Cash Flows - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019	Jun. 30, 2018
Cash flows (used in) provided by operating activities		$ (113)	$ (42)
Cash flows provided by (used in) investing activities
Capital expenditures		(43)	(43)
Proceeds from disposition, net			49
Proceeds from sale of assets, net		1	1
Return of capital from subsidiary from sales of accounts receivable		0	0
Net cash (used in) provided by investing activities		(42)	7
Cash flows provided by (used in) financing activities
Net short-term debt borrowings		(4)	3
Borrowings of long-term debt		667	294
Repayments of long-term debt		(527)	(243)
Debtor Reorganization Items, Debtor-in-Possession Facility Financing Costs	$ (13)	(13)	0
Net intercompany loan borrowings (repayments)		0	0
Long-term debt and credit facility financing fees paid		0	(1)
Return of capital to parent from sales of accounts receivable		0	0
Net cash provided by financing activities		123	53
Effect of exchange rates on cash and cash equivalents			(3)
Change in cash and cash equivalents		(32)	15
Cash, cash equivalents and restricted cash at beginning of period		128	115
Cash, cash equivalents and restricted cash at end of period	96	96	130
Hexion Inc. [Member]
Cash flows (used in) provided by operating activities		(154)	(185)
Cash flows provided by (used in) investing activities
Capital expenditures		(18)	(13)
Proceeds from disposition, net			24
Proceeds from sale of assets, net		0	0
Return of capital from subsidiary from sales of accounts receivable		135	172
Net cash (used in) provided by investing activities		117	183
Cash flows provided by (used in) financing activities
Net short-term debt borrowings		(4)	(5)
Borrowings of long-term debt		89	150
Repayments of long-term debt		(225)	(140)
Net intercompany loan borrowings (repayments)		183	26
Long-term debt and credit facility financing fees paid			0
Return of capital to parent from sales of accounts receivable		0	0
Net cash provided by financing activities		30	31
Effect of exchange rates on cash and cash equivalents			0
Change in cash and cash equivalents		(7)	29
Cash, cash equivalents and restricted cash at beginning of period		20	13
Cash, cash equivalents and restricted cash at end of period	13	13	42
Combined Subsidiary Guarantors [Member]
Cash flows (used in) provided by operating activities		0	0
Cash flows provided by (used in) investing activities
Capital expenditures		0	0
Proceeds from disposition, net			0
Proceeds from sale of assets, net		0	0
Return of capital from subsidiary from sales of accounts receivable		0	0
Net cash (used in) provided by investing activities		0	0
Cash flows provided by (used in) financing activities
Net short-term debt borrowings		0	0
Borrowings of long-term debt		0	0
Repayments of long-term debt		0	0
Net intercompany loan borrowings (repayments)		0	0
Long-term debt and credit facility financing fees paid			0
Return of capital to parent from sales of accounts receivable		0	0
Net cash provided by financing activities		0	0
Effect of exchange rates on cash and cash equivalents			0
Change in cash and cash equivalents		0	0
Cash, cash equivalents and restricted cash at beginning of period		0	0
Cash, cash equivalents and restricted cash at end of period	0	0	0
Combined Non-Guarantor Subsidiaries [Member]
Cash flows (used in) provided by operating activities		41	143
Cash flows provided by (used in) investing activities
Capital expenditures		(25)	(30)
Proceeds from disposition, net			25
Proceeds from sale of assets, net		1	1
Return of capital from subsidiary from sales of accounts receivable		0	0
Net cash (used in) provided by investing activities		(24)	(4)
Cash flows provided by (used in) financing activities
Net short-term debt borrowings		0	8
Borrowings of long-term debt		578	144
Repayments of long-term debt		(302)	(103)
Net intercompany loan borrowings (repayments)		(183)	(26)
Long-term debt and credit facility financing fees paid			(1)
Return of capital to parent from sales of accounts receivable		(135)	(172)
Net cash provided by financing activities		(42)	(150)
Effect of exchange rates on cash and cash equivalents			(3)
Change in cash and cash equivalents		(25)	(14)
Cash, cash equivalents and restricted cash at beginning of period		108	102
Cash, cash equivalents and restricted cash at end of period	83	83	88
Consolidation, Eliminations [Member]
Cash flows (used in) provided by operating activities		0	0
Cash flows provided by (used in) investing activities
Capital expenditures		0	0
Proceeds from disposition, net			0
Proceeds from sale of assets, net		0	0
Return of capital from subsidiary from sales of accounts receivable		(135)	(172)
Net cash (used in) provided by investing activities		(135)	(172)
Cash flows provided by (used in) financing activities
Net short-term debt borrowings		0	0
Borrowings of long-term debt		0	0
Repayments of long-term debt		0	0
Net intercompany loan borrowings (repayments)		0	0
Long-term debt and credit facility financing fees paid			0
Return of capital to parent from sales of accounts receivable		135	172
Net cash provided by financing activities		135	172
Effect of exchange rates on cash and cash equivalents			0
Change in cash and cash equivalents		0	0
Cash, cash equivalents and restricted cash at beginning of period		0	0
Cash, cash equivalents and restricted cash at end of period	$ 0	$ 0	$ 0