Guarantor Non-Guarantor Subsidiary Financial Information Level 4 (Details) - Consolidating Balance Sheets - USD ($) $ in Millions	Sep. 30, 2015	Dec. 31, 2014
Current assets
Cash and cash equivalents (including restricted cash of $0 and $8, respectively)	$ 195	$ 172
Short-term investments	0	7
Accounts receivable, net	579	591
Intercompany accounts receivable	0	0
Intercompany loans receivable - current portion	0	0
Finished and in-process goods	258	290
Raw materials and supplies	104	110
Other current assets	68	73
Total current assets	1,204	1,243
Investment in unconsolidated entities	36	48
Deferred income taxes	16	18
Other assets, net	106	110
Intercompany loans receivable	0	0
Property, Plant and Equipment, Net	1,043	1,055
Goodwill	124	119
Other intangible assets, net	69	81
Total assets	2,598	2,674
Current liabilities
Accounts and drafts payable	386	426
Intercompany accounts payable	0	0
Debt payable within one year	75	99
Intercompany loans payable within one year	0	0
Interest payable	102	82
Income taxes payable	21	12
Accrued payroll and incentive compensation	71	67
Other current liabilities	118	135
Total current liabilities	773	821
Long-term liabilities
Long-term debt	3,843	3,735
Intercompany loans payable	0	0
Accumulated losses of unconsolidated subsidiaries in excess of investment	0	0
Long-term pension and post employment benefit obligations	252	278
Deferred income taxes	18	19
Other long-term liabilities	164	171
Total liabilities	5,050	5,024
Total Hexion Inc. shareholder’s deficit	(2,450)	(2,348)
Noncontrolling interest	(2)	(2)
Total deficit	(2,452)	(2,350)
Total liabilities and deficit	2,598	2,674
Hexion Inc. [Member]
Current assets
Cash and cash equivalents (including restricted cash of $0 and $8, respectively)	45	23
Short-term investments		0
Accounts receivable, net	139	174
Intercompany accounts receivable	126	118
Intercompany loans receivable - current portion	0	265
Finished and in-process goods	104	117
Raw materials and supplies	41	46
Other current assets	32	36
Total current assets	487	779
Investment in unconsolidated entities	151	234
Deferred income taxes	0	0
Other assets, net	77	76
Intercompany loans receivable	1,256	1,046
Property, Plant and Equipment, Net	548	534
Goodwill	66	65
Other intangible assets, net	50	56
Total assets	2,635	2,790
Current liabilities
Accounts and drafts payable	127	142
Intercompany accounts payable	106	138
Debt payable within one year	9	26
Intercompany loans payable within one year	56	43
Interest payable	100	81
Income taxes payable	6	6
Accrued payroll and incentive compensation	34	34
Other current liabilities	68	69
Total current liabilities	506	539
Long-term liabilities
Long-term debt	3,795	3,674
Intercompany loans payable	108	36
Accumulated losses of unconsolidated subsidiaries in excess of investment	501	705
Long-term pension and post employment benefit obligations	50	59
Deferred income taxes	10	8
Other long-term liabilities	115	117
Total liabilities	5,085	5,138
Total Hexion Inc. shareholder’s deficit	(2,450)	(2,348)
Noncontrolling interest	0	0
Total deficit	(2,450)	(2,348)
Total liabilities and deficit	2,635	2,790
Combined Subsidiary Guarantors [Member]
Current assets
Cash and cash equivalents (including restricted cash of $0 and $8, respectively)	0	0
Short-term investments		0
Accounts receivable, net	0	0
Intercompany accounts receivable	0	0
Intercompany loans receivable - current portion	0	0
Finished and in-process goods	0	0
Raw materials and supplies	0	0
Other current assets	0	0
Total current assets	0	0
Investment in unconsolidated entities	30	34
Deferred income taxes	0	0
Other assets, net	6	6
Intercompany loans receivable	29	28
Property, Plant and Equipment, Net	0	0
Goodwill	0	0
Other intangible assets, net	0	0
Total assets	65	68
Current liabilities
Accounts and drafts payable	0	0
Intercompany accounts payable	0	0
Debt payable within one year	0	0
Intercompany loans payable within one year	0	0
Interest payable	0	0
Income taxes payable	0	0
Accrued payroll and incentive compensation	0	0
Other current liabilities	0	0
Total current liabilities	0	0
Long-term liabilities
Long-term debt	0	0
Intercompany loans payable	6	6
Accumulated losses of unconsolidated subsidiaries in excess of investment	164	249
Long-term pension and post employment benefit obligations	0	0
Deferred income taxes	0	0
Other long-term liabilities	0	0
Total liabilities	170	255
Total Hexion Inc. shareholder’s deficit	(105)	(187)
Noncontrolling interest	0	0
Total deficit	(105)	(187)
Total liabilities and deficit	65	68
Combined Non-Guarantor Subsidiaries [Member]
Current assets
Cash and cash equivalents (including restricted cash of $0 and $8, respectively)	150	149
Short-term investments		7
Accounts receivable, net	440	417
Intercompany accounts receivable	106	138
Intercompany loans receivable - current portion	56	43
Finished and in-process goods	154	173
Raw materials and supplies	63	64
Other current assets	36	37
Total current assets	1,005	1,028
Investment in unconsolidated entities	19	29
Deferred income taxes	16	18
Other assets, net	23	28
Intercompany loans receivable	109	17
Property, Plant and Equipment, Net	495	521
Goodwill	58	54
Other intangible assets, net	19	25
Total assets	1,744	1,720
Current liabilities
Accounts and drafts payable	259	284
Intercompany accounts payable	126	118
Debt payable within one year	66	73
Intercompany loans payable within one year	0	265
Interest payable	2	1
Income taxes payable	15	6
Accrued payroll and incentive compensation	37	33
Other current liabilities	50	66
Total current liabilities	555	846
Long-term liabilities
Long-term debt	48	61
Intercompany loans payable	1,280	1,049
Accumulated losses of unconsolidated subsidiaries in excess of investment	0	0
Long-term pension and post employment benefit obligations	202	219
Deferred income taxes	8	11
Other long-term liabilities	49	54
Total liabilities	2,142	2,240
Total Hexion Inc. shareholder’s deficit	(396)	(518)
Noncontrolling interest	(2)	(2)
Total deficit	(398)	(520)
Total liabilities and deficit	1,744	1,720
Eliminations [Member]
Current assets
Cash and cash equivalents (including restricted cash of $0 and $8, respectively)	0	0
Short-term investments		0
Accounts receivable, net	0	0
Intercompany accounts receivable	(232)	(256)
Intercompany loans receivable - current portion	(56)	(308)
Finished and in-process goods	0	0
Raw materials and supplies	0	0
Other current assets	0	0
Total current assets	(288)	(564)
Investment in unconsolidated entities	(164)	(249)
Deferred income taxes	0	0
Other assets, net	0	0
Intercompany loans receivable	(1,394)	(1,091)
Property, Plant and Equipment, Net	0	0
Goodwill	0	0
Other intangible assets, net	0	0
Total assets	(1,846)	(1,904)
Current liabilities
Accounts and drafts payable	0	0
Intercompany accounts payable	(232)	(256)
Debt payable within one year	0	0
Intercompany loans payable within one year	(56)	(308)
Interest payable	0	0
Income taxes payable	0	0
Accrued payroll and incentive compensation	0	0
Other current liabilities	0	0
Total current liabilities	(288)	(564)
Long-term liabilities
Long-term debt	0	0
Intercompany loans payable	(1,394)	(1,091)
Accumulated losses of unconsolidated subsidiaries in excess of investment	(665)	(954)
Long-term pension and post employment benefit obligations	0	0
Deferred income taxes	0	0
Other long-term liabilities	0	0
Total liabilities	(2,347)	(2,609)
Total Hexion Inc. shareholder’s deficit	501	705
Noncontrolling interest	0	0
Total deficit	501	705
Total liabilities and deficit	$ (1,846)	$ (1,904)