Guarantor Non-Guarantor Subsidiary Financial Information Level 4 (Details) - Consolidating Statement of Cash Flows - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Net Cash Provided by (Used in) Operating Activities	$ 66	$ (132)
Cash flows provided by (used in) investing activities
Capital expenditures	(122)	(133)
Payments to Acquire Businesses, Net of Cash Acquired	(7)	(64)
Proceeds from the sale of investments, net	6	(4)
Payments for (Proceeds from) Productive Assets	1	0
Change in restricted cash	8	(2)
Disbursement of affiliated loan		(50)
Repayment of Notes Receivable from Related Parties		50
Capital contribution to subsidiary	0	0
Funds remitted to unconsolidated affiliates, net	0	(2)
Return of capital from subsidiary from sales of accounts receivable	0	0
Net cash (used in) provided by investing activities	(114)	(205)
Cash flows (used in) provided by financing activities
Net short-term debt (repayments) borrowings	(1)	25
Borrowings of long-term debt	492	213
Repayments of long-term debt	(393)	(174)
Net Intercompany Loan Borrowings (Repayments)	0	0
Long-term debt and credit facility financing fees	(10)	0
Capital contribution from parent	0	0
Common stock dividends paid	0	0
Return of capital to parent from sales of accounts receivable	0	0
Net cash used in financing activities	88	64
Effect of exchange rates on cash and cash equivalents	(9)	(5)
Increase (decrease) in cash and cash equivalents	31	(278)
Cash and cash equivalents (unrestricted) at beginning of period	156	379
Cash and cash equivalents (unrestricted) at end of period	187	101
Hexion Inc. [Member]
Net Cash Provided by (Used in) Operating Activities	(255)	(349)
Cash flows provided by (used in) investing activities
Capital expenditures	(63)	(74)
Payments to Acquire Businesses, Net of Cash Acquired	0	(52)
Proceeds from the sale of investments, net	0	0
Payments for (Proceeds from) Productive Assets	0
Change in restricted cash	0	0
Disbursement of affiliated loan		0
Repayment of Notes Receivable from Related Parties		0
Capital contribution to subsidiary	(13)	(16)
Funds remitted to unconsolidated affiliates, net		0
Return of capital from subsidiary from sales of accounts receivable	227	272
Net cash (used in) provided by investing activities	151	130
Cash flows (used in) provided by financing activities
Net short-term debt (repayments) borrowings	3	8
Borrowings of long-term debt	470	155
Repayments of long-term debt	(354)	(110)
Net Intercompany Loan Borrowings (Repayments)	17	10
Long-term debt and credit facility financing fees	(10)
Capital contribution from parent	0	0
Common stock dividends paid	0	0
Return of capital to parent from sales of accounts receivable	0	0
Net cash used in financing activities	126	63
Effect of exchange rates on cash and cash equivalents	0	0
Increase (decrease) in cash and cash equivalents	22	(156)
Cash and cash equivalents (unrestricted) at beginning of period	23	165
Cash and cash equivalents (unrestricted) at end of period	45	9
Combined Subsidiary Guarantors [Member]
Net Cash Provided by (Used in) Operating Activities	14	6
Cash flows provided by (used in) investing activities
Capital expenditures	0	0
Payments to Acquire Businesses, Net of Cash Acquired	0	0
Proceeds from the sale of investments, net	0	0
Payments for (Proceeds from) Productive Assets	0
Change in restricted cash	0	0
Disbursement of affiliated loan		0
Repayment of Notes Receivable from Related Parties		0
Capital contribution to subsidiary	(8)	(10)
Funds remitted to unconsolidated affiliates, net		0
Return of capital from subsidiary from sales of accounts receivable	0	0
Net cash (used in) provided by investing activities	(8)	(10)
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
Capital contribution from parent	8	10
Common stock dividends paid	(14)	(9)
Return of capital to parent from sales of accounts receivable	0	0
Net cash used in financing activities	(6)	1
Effect of exchange rates on cash and cash equivalents	0	0
Increase (decrease) in cash and cash equivalents	0	(3)
Cash and cash equivalents (unrestricted) at beginning of period	0	5
Cash and cash equivalents (unrestricted) at end of period	0	2
Combined Non-Guarantor Subsidiaries [Member]
Net Cash Provided by (Used in) Operating Activities	321	220
Cash flows provided by (used in) investing activities
Capital expenditures	(59)	(59)
Payments to Acquire Businesses, Net of Cash Acquired	(7)	(12)
Proceeds from the sale of investments, net	6	(4)
Payments for (Proceeds from) Productive Assets	1
Change in restricted cash	8	(2)
Disbursement of affiliated loan		(50)
Repayment of Notes Receivable from Related Parties		50
Capital contribution to subsidiary	0	0
Funds remitted to unconsolidated affiliates, net		(2)
Return of capital from subsidiary from sales of accounts receivable	0	0
Net cash (used in) provided by investing activities	(51)	(79)
Cash flows (used in) provided by financing activities
Net short-term debt (repayments) borrowings	(4)	17
Borrowings of long-term debt	22	58
Repayments of long-term debt	(39)	(64)
Net Intercompany Loan Borrowings (Repayments)	(17)	(10)
Long-term debt and credit facility financing fees	0
Capital contribution from parent	13	16
Common stock dividends paid	0	0
Return of capital to parent from sales of accounts receivable	(227)	(272)
Net cash used in financing activities	(252)	(255)
Effect of exchange rates on cash and cash equivalents	(9)	(5)
Increase (decrease) in cash and cash equivalents	9	(119)
Cash and cash equivalents (unrestricted) at beginning of period	133	209
Cash and cash equivalents (unrestricted) at end of period	142	90
Eliminations [Member]
Net Cash Provided by (Used in) Operating Activities	(14)	(9)
Cash flows provided by (used in) investing activities
Capital expenditures	0	0
Payments to Acquire Businesses, Net of Cash Acquired	0	0
Proceeds from the sale of investments, net	0	0
Payments for (Proceeds from) Productive Assets	0
Change in restricted cash	0	0
Disbursement of affiliated loan		0
Repayment of Notes Receivable from Related Parties		0
Capital contribution to subsidiary	21	26
Funds remitted to unconsolidated affiliates, net		0
Return of capital from subsidiary from sales of accounts receivable	(227)	(272)
Net cash (used in) provided by investing activities	(206)	(246)
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
Net Intercompany Loan Borrowings (Repayments)	0	$ 0
Long-term debt and credit facility financing fees	0
Capital contribution from parent	(21)	(26)
Common stock dividends paid	14	9
Return of capital to parent from sales of accounts receivable	227	272
Net cash used in financing activities	220	255
Effect of exchange rates on cash and cash equivalents	0	0
Increase (decrease) in cash and cash equivalents	0	0
Cash and cash equivalents (unrestricted) at beginning of period	0	0
Cash and cash equivalents (unrestricted) at end of period	$ 0	$ 0