Guarantor Non-Guarantor Subsidiary Financial Information Level 4 (Details) - Consolidating Statement of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Net Cash Provided by (Used in) Operating Activities	$ 28	$ (186)
Cash flows provided by (used in) investing activities
Capital expenditures	(79)	(78)
Payments to Acquire Businesses, Net of Cash Acquired		(64)
Proceeds from the sale of (purchases of) debt securities, net	4	3
Change in restricted cash	0	(2)
Disbursement of affiliated loan		(50)
Repayment of Notes Receivable from Related Parties		50
Capital contribution to subsidiary		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	(75)	(143)
Cash flows (used in) provided by financing activities
Net short-term debt (repayments) borrowings	(5)	27
Borrowings of long-term debt	490	160
Repayments of long-term debt	(274)	(117)
Net Intercompany Loan Borrowings (Repayments)	0	0
Long-term debt and credit facility financing fees	(8)	0
Capital contribution from parent		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	203	70
Effect of exchange rates on cash and cash equivalents	(4)	(1)
Increase (decrease) in cash and cash equivalents	152	(260)
Cash and cash equivalents (unrestricted) at beginning of period	156	379
Cash and cash equivalents (unrestricted) at end of period	308	119
Hexion Inc. [Member]
Net Cash Provided by (Used in) Operating Activities	(148)	(270)
Cash flows provided by (used in) investing activities
Capital expenditures	(42)	(41)
Payments to Acquire Businesses, Net of Cash Acquired		(52)
Proceeds from the sale of (purchases of) debt securities, net	0	$ 0
Change in restricted cash
Disbursement of affiliated loan		$ 0
Repayment of Notes Receivable from Related Parties		0
Capital contribution to subsidiary		(16)
Funds remitted to unconsolidated affiliates, net		0
Return of capital from subsidiary from sales of accounts receivable	151	186
Net cash (used in) provided by investing activities	109	77
Cash flows (used in) provided by financing activities
Net short-term debt (repayments) borrowings	(5)	0
Borrowings of long-term debt	470	115
Repayments of long-term debt	(255)	(69)
Net Intercompany Loan Borrowings (Repayments)	(5)	9
Long-term debt and credit facility financing fees	(8)
Capital contribution from parent		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	197	55
Effect of exchange rates on cash and cash equivalents	0	0
Increase (decrease) in cash and cash equivalents	158	(138)
Cash and cash equivalents (unrestricted) at beginning of period	23	170
Cash and cash equivalents (unrestricted) at end of period	181	32
Combined Subsidiary Guarantors [Member]
Net Cash Provided by (Used in) Operating Activities	9	6
Cash flows provided by (used in) investing activities
Capital expenditures	0	$ 0
Payments to Acquire Businesses, Net of Cash Acquired
Proceeds from the sale of (purchases of) debt securities, net	0	$ 0
Change in restricted cash		0
Disbursement of affiliated loan		0
Repayment of Notes Receivable from Related Parties		0
Capital contribution to subsidiary		(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	0	(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		10
Common stock dividends paid	(9)	(6)
Return of capital to parent from sales of accounts receivable	0	0
Net cash used in financing activities	(9)	4
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
Combined Non-Guarantor Subsidiaries [Member]
Net Cash Provided by (Used in) Operating Activities	176	84
Cash flows provided by (used in) investing activities
Capital expenditures	(37)	(37)
Payments to Acquire Businesses, Net of Cash Acquired		(12)
Proceeds from the sale of (purchases of) debt securities, net	4	3
Change in restricted cash		(2)
Disbursement of affiliated loan		(50)
Repayment of Notes Receivable from Related Parties		50
Capital contribution to subsidiary		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	(33)	(50)
Cash flows (used in) provided by financing activities
Net short-term debt (repayments) borrowings	0	27
Borrowings of long-term debt	20	45
Repayments of long-term debt	(19)	(48)
Net Intercompany Loan Borrowings (Repayments)	5	(9)
Long-term debt and credit facility financing fees	0
Capital contribution from parent		16
Common stock dividends paid	0	0
Return of capital to parent from sales of accounts receivable	(151)	(186)
Net cash used in financing activities	(145)	(155)
Effect of exchange rates on cash and cash equivalents	(4)	(1)
Increase (decrease) in cash and cash equivalents	(6)	(122)
Cash and cash equivalents (unrestricted) at beginning of period	133	209
Cash and cash equivalents (unrestricted) at end of period	127	87
Eliminations [Member]
Net Cash Provided by (Used in) Operating Activities	(9)	(6)
Cash flows provided by (used in) investing activities
Capital expenditures	0	$ 0
Payments to Acquire Businesses, Net of Cash Acquired
Proceeds from the sale of (purchases of) debt securities, net	0	$ 0
Change in restricted cash		0
Disbursement of affiliated loan		0
Repayment of Notes Receivable from Related Parties		0
Capital contribution to subsidiary		26
Funds remitted to unconsolidated affiliates, net		0
Return of capital from subsidiary from sales of accounts receivable	(151)	(186)
Net cash (used in) provided by investing activities	(151)	(160)
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		(26)
Common stock dividends paid	9	6
Return of capital to parent from sales of accounts receivable	151	186
Net cash used in financing activities	160	166
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