Guarantor Non-Guarantor Subsidiary Financial Information Level 4 (Details) - Consolidating Balance Sheets - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Current assets
Cash and cash equivalents (including restricted cash of $0 and $18, respectively)	$ 118	$ 196
Accounts receivable, net	500	390
Intercompany accounts receivable	0	0
Intercompany loans receivable - current portion	0	0
Finished and in-process goods	240	199
Raw materials and supplies	92	88
Other current assets	49	45
Total current assets	999	918
Investment in unconsolidated entities	20	18
Deferred income taxes	12	10
Other Assets, Noncurrent	49	43
Intercompany loans receivable	0	0
Property, Plant and Equipment, Net	918	893
Goodwill	113	121
Other intangible assets, net	45	52
Total assets	2,156	2,055
Current liabilities
Accounts and drafts payable	347	368
Intercompany accounts payable	0	0
Debt payable within one year	121	107
Intercompany loans payable within one year	0	0
Interest payable	101	70
Income taxes payable	13	13
Accrued payroll and incentive compensation	47	55
Other current liabilities	126	159
Total current liabilities	755	772
Long-term liabilities
Long-term debt	3,612	3,397
Intercompany loans payable	0	0
Accumulated losses of unconsolidated subsidiaries in excess of investment	0	0
Long-term pension and post employment benefit obligations	263	246
Deferred income taxes	13	13
Other long-term liabilities	173	166
Total liabilities	4,816	4,594
Total Hexion Inc. shareholder’s deficit	(2,659)	(2,538)
Noncontrolling interest	(1)	(1)
Total deficit	(2,660)	(2,539)
Total liabilities and deficit	2,156	2,055
Hexion Inc. [Member]
Current assets
Cash and cash equivalents (including restricted cash of $0 and $18, respectively)	6	28
Accounts receivable, net	131	119
Intercompany accounts receivable	104	106
Intercompany loans receivable - current portion	9	0
Finished and in-process goods	87	82
Raw materials and supplies	35	31
Other current assets	16	26
Total current assets	388	392
Investment in unconsolidated entities	146	93
Deferred income taxes	1	0
Other Assets, Noncurrent	16	17
Intercompany loans receivable	1,110	1,050
Property, Plant and Equipment, Net	416	448
Goodwill	52	65
Other intangible assets, net	35	41
Total assets	2,164	2,106
Current liabilities
Accounts and drafts payable	109	142
Intercompany accounts payable	22	60
Debt payable within one year	10	6
Intercompany loans payable within one year	0	175
Interest payable	99	69
Income taxes payable	8	6
Accrued payroll and incentive compensation	10	28
Other current liabilities	69	110
Total current liabilities	327	596
Long-term liabilities
Long-term debt	3,528	3,378
Intercompany loans payable	208	180
Accumulated losses of unconsolidated subsidiaries in excess of investment	614	339
Long-term pension and post employment benefit obligations	39	42
Deferred income taxes	2	4
Other long-term liabilities	105	105
Total liabilities	4,823	4,644
Total Hexion Inc. shareholder’s deficit	(2,659)	(2,538)
Noncontrolling interest	0	0
Total deficit	(2,659)	(2,538)
Total liabilities and deficit	2,164	2,106
Combined Subsidiary Guarantors [Member]
Current assets
Cash and cash equivalents (including restricted cash of $0 and $18, respectively)	0	0
Accounts receivable, net	2	1
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	2	1
Investment in unconsolidated entities	13	13
Deferred income taxes	0	0
Other Assets, Noncurrent	6	6
Intercompany loans receivable	0	0
Property, Plant and Equipment, Net	0	0
Goodwill	0	0
Other intangible assets, net	0	0
Total assets	21	20
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	0	0
Accumulated losses of unconsolidated subsidiaries in excess of investment	159	106
Long-term pension and post employment benefit obligations	0	0
Deferred income taxes	0	0
Other long-term liabilities	0	0
Total liabilities	159	106
Total Hexion Inc. shareholder’s deficit	(138)	(86)
Noncontrolling interest	0	0
Total deficit	(138)	(86)
Total liabilities and deficit	21	20
Combined Non-Guarantor Subsidiaries [Member]
Current assets
Cash and cash equivalents (including restricted cash of $0 and $18, respectively)	112	168
Accounts receivable, net	367	270
Intercompany accounts receivable	22	60
Intercompany loans receivable - current portion	0	175
Finished and in-process goods	153	117
Raw materials and supplies	57	57
Other current assets	33	19
Total current assets	744	866
Investment in unconsolidated entities	20	18
Deferred income taxes	11	10
Other Assets, Noncurrent	27	20
Intercompany loans receivable	208	180
Property, Plant and Equipment, Net	502	445
Goodwill	61	56
Other intangible assets, net	10	11
Total assets	1,583	1,606
Current liabilities
Accounts and drafts payable	238	226
Intercompany accounts payable	104	106
Debt payable within one year	111	101
Intercompany loans payable within one year	9	0
Interest payable	2	1
Income taxes payable	5	7
Accrued payroll and incentive compensation	37	27
Other current liabilities	57	49
Total current liabilities	563	517
Long-term liabilities
Long-term debt	84	19
Intercompany loans payable	1,110	1,050
Accumulated losses of unconsolidated subsidiaries in excess of investment	0	0
Long-term pension and post employment benefit obligations	224	204
Deferred income taxes	11	9
Other long-term liabilities	68	61
Total liabilities	2,060	1,860
Total Hexion Inc. shareholder’s deficit	(476)	(253)
Noncontrolling interest	(1)	(1)
Total deficit	(477)	(254)
Total liabilities and deficit	1,583	1,606
Consolidation, Eliminations [Member]
Current assets
Cash and cash equivalents (including restricted cash of $0 and $18, respectively)	0	0
Accounts receivable, net	0	0
Intercompany accounts receivable	(126)	(166)
Intercompany loans receivable - current portion	(9)	(175)
Finished and in-process goods	0	0
Raw materials and supplies	0	0
Other current assets	0	0
Total current assets	(135)	(341)
Investment in unconsolidated entities	(159)	(106)
Deferred income taxes	0	0
Other Assets, Noncurrent	0	0
Intercompany loans receivable	(1,318)	(1,230)
Property, Plant and Equipment, Net	0	0
Goodwill	0	0
Other intangible assets, net	0	0
Total assets	(1,612)	(1,677)
Current liabilities
Accounts and drafts payable	0	0
Intercompany accounts payable	(126)	(166)
Debt payable within one year	0	0
Intercompany loans payable within one year	(9)	(175)
Interest payable	0	0
Income taxes payable	0	0
Accrued payroll and incentive compensation	0	0
Other current liabilities	0	0
Total current liabilities	(135)	(341)
Long-term liabilities
Long-term debt	0	0
Intercompany loans payable	(1,318)	(1,230)
Accumulated losses of unconsolidated subsidiaries in excess of investment	(773)	(445)
Long-term pension and post employment benefit obligations	0	0
Deferred income taxes	0	0
Other long-term liabilities	0	0
Total liabilities	(2,226)	(2,016)
Total Hexion Inc. shareholder’s deficit	614	339
Noncontrolling interest	0	0
Total deficit	614	339
Total liabilities and deficit	$ (1,612)	$ (1,677)