Guarantor Non-Guarantor Subsidiary Financial Information Level 4 (Details) - Consolidating Statement of Operations - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Net sales	$ 1,065	$ 1,347	$ 3,231	$ 3,977
Cost of sales	905	1,188	2,753	3,487
Gross profit	160	159	478	490
Selling, general and administrative expense	71	82	229	269
Business realignment costs	3	6	11	24
Other operating expense (income), net	12	4	22	7
Operating income	74	67	216	190
Interest expense, net	84	77	245	230
Intercompany interest expense (income)	0	0	0	0
Gain on extinguishment of debt	(14)	0	(14)	0
Other non-operating expense (income), net	0	18	(1)	23
Loss before income tax and earnings from unconsolidated entities	4	(28)	(14)	(63)
Income tax (benefit) expense	1	2	28	17
Loss before earnings from unconsolidated entities	3	(30)	(42)	(80)
(Losses) earnings from unconsolidated entities, net of taxes	4	4	13	14
Net loss	7	(26)	(29)	(66)
Comprehensive income (loss)	(17)	(66)	(102)	(107)
Hexion Inc. [Member]
Net sales	433	597	1,341	1,770
Cost of sales	384	531	1,187	1,560
Gross profit	49	66	154	210
Selling, general and administrative expense	29	24	89	75
Business realignment costs	1	4	4	19
Other operating expense (income), net	5	1	9	4
Operating income	14	37	52	112
Interest expense, net	81	76	239	225
Intercompany interest expense (income)	(20)	(23)	(60)	(72)
Gain on extinguishment of debt	(14)		(14)
Other non-operating expense (income), net	(1)	62	68	67
Loss before income tax and earnings from unconsolidated entities	(32)	(78)	(181)	(108)
Income tax (benefit) expense	1	(8)	(1)	(11)
Loss before earnings from unconsolidated entities	(33)	(70)	(180)	(97)
(Losses) earnings from unconsolidated entities, net of taxes	40	44	151	31
Net loss	7	(26)	(29)	(66)
Comprehensive income (loss)	(17)	(66)	(102)	(107)
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
Business realignment costs	0	0	0	0
Other operating expense (income), net	0	(1)	0	(1)
Operating income	0	1	0	1
Interest expense, net	0	0	0	$ 0
Intercompany interest expense (income)	(1)	0	(1)
Gain on extinguishment of debt	0		0
Other non-operating expense (income), net	0	0	0	$ 0
Loss before income tax and earnings from unconsolidated entities	1	1	1	1
Income tax (benefit) expense	0	0	0	0
Loss before earnings from unconsolidated entities	1	1	1	1
(Losses) earnings from unconsolidated entities, net of taxes	17	25	95	29
Net loss	18	26	96	30
Comprehensive income (loss)	17	27	96	31
Combined Non-Guarantor Subsidiaries [Member]
Net sales	675	816	2,030	2,392
Cost of sales	564	723	1,706	2,112
Gross profit	111	93	324	280
Selling, general and administrative expense	42	58	140	194
Business realignment costs	2	2	7	5
Other operating expense (income), net	7	4	13	4
Operating income	60	29	164	77
Interest expense, net	3	1	6	5
Intercompany interest expense (income)	21	23	61	72
Gain on extinguishment of debt	0		0
Other non-operating expense (income), net	1	(44)	(69)	(44)
Loss before income tax and earnings from unconsolidated entities	35	49	166	44
Income tax (benefit) expense	0	10	29	28
Loss before earnings from unconsolidated entities	35	39	137	16
(Losses) earnings from unconsolidated entities, net of taxes	0	2	0	4
Net loss	35	41	137	20
Comprehensive income (loss)	20	34	102	16
Eliminations [Member]
Net sales	(43)	(66)	(140)	(185)
Cost of sales	(43)	(66)	(140)	(185)
Gross profit	0	0	0	0
Selling, general and administrative expense	0	0	0	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
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	(53)	(67)	(233)	(50)
Net loss	(53)	(67)	(233)	(50)
Comprehensive income (loss)	$ (37)	$ (61)	$ (198)	$ (47)