Guarantor Non-Guarantor Subsidiary Financial Information Level 4 (Details) - Consolidating Statement of Operations - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Net sales	$ 909	$ 1,079
Cost of sales	802	923
Gross profit	107	156
Selling, general and administrative expense	84	82
Business realignment costs	3	3
Other operating expense (income), net	3	8
Operating income	17	63
Interest expense, net	79	77
Intercompany interest expense (income)	0	0
Gain on extinguishment of debt	(23)	0
Other non-operating expense (income), net	2	(3)
Loss before income tax and earnings from unconsolidated entities	(41)	(11)
Income tax (benefit) expense	7	26
Loss before earnings from unconsolidated entities	(48)	(37)
(Losses) earnings from unconsolidated entities, net of taxes	4	3
Net loss	(44)	(34)
Comprehensive income (loss)	(18)	(96)
Hexion Inc. [Member]
Net sales	381	465
Cost of sales	374	405
Gross profit	7	60
Selling, general and administrative expense	39	35
Business realignment costs	1	2
Other operating expense (income), net	2	4
Operating income	(35)	19
Interest expense, net	77	75
Intercompany interest expense (income)	(19)	(20)
Gain on extinguishment of debt	(23)
Other non-operating expense (income), net	(35)	101
Loss before income tax and earnings from unconsolidated entities	(35)	(137)
Income tax (benefit) expense	(4)	(5)
Loss before earnings from unconsolidated entities	(31)	(132)
(Losses) earnings from unconsolidated entities, net of taxes	(13)	98
Net loss	(44)	(34)
Comprehensive income (loss)	(18)	(96)
Combined Subsidiary Guarantors [Member]
Net sales	0	0
Cost of sales	0	0
Gross profit	0	0
Selling, general and administrative expense	0	0
Business realignment costs	0	0
Other operating expense (income), net	0	0
Operating income	0	0
Interest expense, net	0	0
Intercompany interest expense (income)	0	0
Gain on extinguishment of debt	0
Other non-operating expense (income), net	0	0
Loss before income tax and earnings from unconsolidated entities	0	0
Income tax (benefit) expense	0	0
Loss before earnings from unconsolidated entities	0	0
(Losses) earnings from unconsolidated entities, net of taxes	(5)	74
Net loss	(5)	74
Comprehensive income (loss)	(6)	74
Combined Non-Guarantor Subsidiaries [Member]
Net sales	578	663
Cost of sales	478	567
Gross profit	100	96
Selling, general and administrative expense	45	47
Business realignment costs	2	1
Other operating expense (income), net	1	4
Operating income	52	44
Interest expense, net	2	2
Intercompany interest expense (income)	19	20
Gain on extinguishment of debt	0
Other non-operating expense (income), net	37	(104)
Loss before income tax and earnings from unconsolidated entities	(6)	126
Income tax (benefit) expense	11	31
Loss before earnings from unconsolidated entities	(17)	95
(Losses) earnings from unconsolidated entities, net of taxes	0	(2)
Net loss	(17)	93
Comprehensive income (loss)	(2)	68
Eliminations [Member]
Net sales	(50)	(49)
Cost of sales	(50)	(49)
Gross profit	0	0
Selling, general and administrative expense	0	0
Business realignment costs	0	0
Other operating expense (income), net	0	0
Operating income	0	0
Interest expense, net	0	0
Intercompany interest expense (income)	0	0
Gain on extinguishment of debt	0
Other non-operating expense (income), net	0	0
Loss before income tax and earnings from unconsolidated entities	0	0
Income tax (benefit) expense	0	0
Loss before earnings from unconsolidated entities	0	0
(Losses) earnings from unconsolidated entities, net of taxes	22	(167)
Net loss	22	(167)
Comprehensive income (loss)	$ 8	$ (142)