Guarantor Non-Guarantor Subsidiary Financial Information Level 4 (Details) - Consolidating Statement of Cash Flows - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Net Cash Provided by (Used in) Operating Activities	$ (83)	$ (118)
Cash flows provided by (used in) investing activities
Capital expenditures	(25)	(30)
Proceeds from dispositions, net	49
proceeds from sale of assets, net	1	4
Return of capital from subsidiary from sales of accounts receivable	0	0
Net cash (used in) provided by investing activities	25	(26)
Cash flows (used in) provided by financing activities
Net short-term debt (repayments) borrowings	(15)	11
Borrowings of long-term debt	166	871
Repayments of long-term debt	(96)	(791)
Net Intercompany Loan Borrowings (Repayments)	0	0
Long-term debt and credit facility financing fees	(1)	(22)
Return of capital to parent from sales of accounts receivable	0	0
Net cash used in financing activities	54	69
Effect of Exchange Rate on Cash and Cash Equivalents	2	2
Increase (decrease) in cash and cash equivalents	(2)	(73)
Cash and cash equivalents at beginning of period	115	196
Cash and cash equivalents at end of period	113	123
Hexion Inc. [Member]
Net Cash Provided by (Used in) Operating Activities	(49)	(93)
Cash flows provided by (used in) investing activities
Capital expenditures	(8)	(13)
Proceeds from dispositions, net	24
proceeds from sale of assets, net	0	4
Return of capital from subsidiary from sales of accounts receivable	73	33
Net cash (used in) provided by investing activities	89	24
Cash flows (used in) provided by financing activities
Net short-term debt (repayments) borrowings	(3)	(3)
Borrowings of long-term debt	50	770
Repayments of long-term debt	(58)	(742)
Net Intercompany Loan Borrowings (Repayments)	(23)	46
Long-term debt and credit facility financing fees	0	(18)
Return of capital to parent from sales of accounts receivable	0	0
Net cash used in financing activities	(34)	53
Effect of Exchange Rate on Cash and Cash Equivalents	0	0
Increase (decrease) in cash and cash equivalents	6	(16)
Cash and cash equivalents at beginning of period	13	28
Cash and cash equivalents at end of period	19	12
Combined Subsidiary Guarantors [Member]
Net Cash Provided by (Used in) Operating Activities	0	0
Cash flows provided by (used in) investing activities
Capital expenditures	0	0
Proceeds from dispositions, 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 (used in) provided by financing activities
Net short-term debt (repayments) 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	0	0
Return of capital to parent from sales of accounts receivable	0	0
Net cash used in financing activities	0	0
Effect of Exchange Rate on Cash and Cash Equivalents	0	0
Increase (decrease) in cash and cash equivalents	0	0
Cash and cash equivalents at beginning of period	0	0
Cash and cash equivalents at end of period	0	0
Combined Non-Guarantor Subsidiaries [Member]
Net Cash Provided by (Used in) Operating Activities	(34)	(25)
Cash flows provided by (used in) investing activities
Capital expenditures	(17)	(17)
Proceeds from dispositions, net	25
proceeds from sale of assets, net	1	0
Return of capital from subsidiary from sales of accounts receivable	0	0
Net cash (used in) provided by investing activities	9	(17)
Cash flows (used in) provided by financing activities
Net short-term debt (repayments) borrowings	(12)	14
Borrowings of long-term debt	116	101
Repayments of long-term debt	(38)	(49)
Net Intercompany Loan Borrowings (Repayments)	23	(46)
Long-term debt and credit facility financing fees	(1)	(4)
Return of capital to parent from sales of accounts receivable	(73)	(33)
Net cash used in financing activities	15	(17)
Effect of Exchange Rate on Cash and Cash Equivalents	2	2
Increase (decrease) in cash and cash equivalents	(8)	(57)
Cash and cash equivalents at beginning of period	102	168
Cash and cash equivalents at end of period	94	111
Consolidation, Eliminations [Member]
Net Cash Provided by (Used in) Operating Activities	0	0
Cash flows provided by (used in) investing activities
Capital expenditures	0	0
Proceeds from dispositions, net	0
proceeds from sale of assets, net	0	0
Return of capital from subsidiary from sales of accounts receivable	(73)	(33)
Net cash (used in) provided by investing activities	(73)	(33)
Cash flows (used in) provided by financing activities
Net short-term debt (repayments) 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	0	0
Return of capital to parent from sales of accounts receivable	73	33
Net cash used in financing activities	73	33
Effect of Exchange Rate on Cash and Cash Equivalents	0	0
Increase (decrease) in cash and cash equivalents	0	0
Cash and cash equivalents at beginning of period	0	0
Cash and cash equivalents at end of period	$ 0	$ 0