Guarantor Non-Guarantor Subsidiary Financial Information Level 4 (Details) - Consolidating Statement of Operations - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Net sales	$ 819	$ 1,065	$ 2,680	$ 3,231
Cost of sales	701	905	2,357	2,753
Gross profit	118	160	323	478
Selling, general and administrative expense	69	71	235	229
Gain on Disposition of Assets			(240)
Business realignment costs	(3)	3	42	11
Other operating expense (income), net	7	12	6	22
Operating income	45	74	280	216
Interest expense, net	76	84	235	245
Intercompany interest expense (income)	0	0	0	0
Gain on extinguishment of debt	(3)	(14)	(47)	(14)
Other non-operating expense (income), net	2	0	1	(1)
Loss before income tax and earnings from unconsolidated entities	(30)	4	91	(14)
Income tax (benefit) expense	16	1	40	28
Loss before earnings from unconsolidated entities	(46)	3	51	(42)
(Losses) earnings from unconsolidated entities, net of taxes	(1)	4	8	13
Net income	(47)	7	59	(29)
Comprehensive income (loss)	(40)	(17)	66	(102)
Hexion Inc. [Member]
Net sales	356	433	1,119	1,341
Cost of sales	325	384	1,080	1,187
Gross profit	31	49	39	154
Selling, general and administrative expense	30	29	109	89
Gain on Disposition of Assets			(188)
Business realignment costs	(7)	1	31	4
Other operating expense (income), net	10	5	14	9
Operating income	(2)	14	73	52
Interest expense, net	74	81	227	239
Intercompany interest expense (income)	(18)	(20)	(55)	(60)
Gain on extinguishment of debt	(3)	(14)	(47)	(14)
Other non-operating expense (income), net	(5)	(1)	(16)	68
Loss before income tax and earnings from unconsolidated entities	(50)	(32)	(36)	(181)
Income tax (benefit) expense	9	1	5	(1)
Loss before earnings from unconsolidated entities	(59)	(33)	(41)	(180)
(Losses) earnings from unconsolidated entities, net of taxes	12	40	100	151
Net income	(47)	7	59	(29)
Comprehensive income (loss)	(40)	(17)	66	(102)
Combined Subsidiary Guarantors [Member]
Net sales	0	0	0	0
Cost of sales	0	0	0	0
Gross profit	0	0	0	0
Selling, general and administrative expense	0	0	0	0
Gain on Disposition of Assets			0
Business realignment costs	0	0	0	0
Other operating expense (income), net	6	0	6	0
Operating income	(6)	0	(6)	0
Interest expense, net	0	0	0	0
Intercompany interest expense (income)	0	(1)	0	(1)
Gain on extinguishment of debt	0	0	0	0
Other non-operating expense (income), net	0	0	0	0
Loss before income tax and earnings from unconsolidated entities	(6)	1	(6)	1
Income tax (benefit) expense	0	0	0	0
Loss before earnings from unconsolidated entities	(6)	1	(6)	1
(Losses) earnings from unconsolidated entities, net of taxes	(1)	17	45	95
Net income	(7)	18	39	96
Comprehensive income (loss)	(7)	17	39	96
Combined Non-Guarantor Subsidiaries [Member]
Net sales	507	675	1,701	2,030
Cost of sales	420	564	1,417	1,706
Gross profit	87	111	284	324
Selling, general and administrative expense	39	42	126	140
Gain on Disposition of Assets			(52)
Business realignment costs	4	2	11	7
Other operating expense (income), net	(9)	7	(14)	13
Operating income	53	60	213	164
Interest expense, net	2	3	8	6
Intercompany interest expense (income)	18	21	55	61
Gain on extinguishment of debt	0	0	0	0
Other non-operating expense (income), net	7	1	17	(69)
Loss before income tax and earnings from unconsolidated entities	26	35	133	166
Income tax (benefit) expense	7	0	35	29
Loss before earnings from unconsolidated entities	19	35	98	137
(Losses) earnings from unconsolidated entities, net of taxes	0	0	2	0
Net income	19	35	100	137
Comprehensive income (loss)	26	20	100	102
Consolidation, Eliminations [Member]
Net sales	(44)	(43)	(140)	(140)
Cost of sales	(44)	(43)	(140)	(140)
Gross profit	0	0	0	0
Selling, general and administrative expense	0	0	0	0
Gain on Disposition of Assets			0
Business realignment costs	0	0	0	0
Other operating expense (income), net	0	0	0	0
Operating income	0	0	0	0
Interest expense, net	0	0	0	0
Intercompany interest expense (income)	0	0	0	0
Gain on extinguishment of debt	0	0	0	0
Other non-operating expense (income), net	0	0	0	0
Loss before income tax and earnings from unconsolidated entities	0	0	0	0
Income tax (benefit) expense	0	0	0	0
Loss before earnings from unconsolidated entities	0	0	0	0
(Losses) earnings from unconsolidated entities, net of taxes	(12)	(53)	(139)	(233)
Net income	(12)	(53)	(139)	(233)
Comprehensive income (loss)	$ (19)	$ (37)	$ (139)	$ (198)