Guarantor/Non-Guarantor Subsidiary Financial Informa GuarantorNonguarantor Subsidiary Level 4 - (Details) - Statement of Operations - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Condensed Financial Statements, Captions [Line Items]
Document Period End Date			Jun. 30, 2015
Net sales	$ 602	$ 637	$ 1,181	$ 1,242
Cost of Goods Sold	$ 490		$ 969
Costs and expenses:
Cost of sales, excluding depreciation		460		894
Depreciation and amortization expenses		42		83
Research and Development Expense	$ 18	19	$ 36	39
Restructuring Charges	5	10	9	14
Other Operating Income	(2)	0	5	0
Operating (loss) income	27	17	38	44
Other income (expense):
Other non-operating expense (income), net	(2)	0	2	0
Reorganization Items	2	70	7	70
Income Tax Expense (Benefit)	(5)	13	5	21
Loss before earnings losses from unconsolidated entities	12	(107)	(15)	(164)
Earnings (losses) from unconsolidated entities	0	1	1	2
Net Income (Loss)	12	(106)	(14)	(162)
Comprehensive loss	16	(105)	(53)	(175)
Parent [Member]
Condensed Financial Statements, Captions [Line Items]
Net sales	0	0	0	0
Cost of Goods Sold	0		0
Costs and expenses:
Cost of sales, excluding depreciation		0		0
Selling, General and Administrative Expense, Including Restructuring Costs	0	12	0	20
Depreciation and amortization expenses		0		0
Research and Development Expense	0	0	0	0
Restructuring Charges	0	1	0	2
Other Operating Income	0		2
Operating (loss) income	0	(13)	2	(22)
Other income (expense):
Interest expense	19	40	38	113
Nonoperating Income (Expense)	0		0
Reorganization Items	0		0
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest	(19)	(70)	(36)	(152)
Income Tax Expense (Benefit)	0	0	0	0
Loss before earnings losses from unconsolidated entities	(19)	(70)	(36)	(152)
Earnings (losses) from unconsolidated entities	31	(36)	22	(10)
Net Income (Loss)	12	(106)	(14)	(162)
Comprehensive loss	16	(105)	(53)	(175)
Guarantor subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Net sales	278	294	553	559
Cost of Goods Sold	239		479
Costs and expenses:
Cost of sales, excluding depreciation		218		408
Selling, General and Administrative Expense, Including Restructuring Costs	7	46	51	89
Depreciation and amortization expenses		17		34
Research and Development Expense	11	12	22	24
Restructuring Charges	5	9	9	10
Other Operating Income	3		5
Operating (loss) income	19	(8)	(3)	(6)
Other income (expense):
Interest expense	(14)	(27)	(33)	(66)
Nonoperating Income (Expense)	2		(4)
Reorganization Items	2		7
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest	33	(34)	19	7
Income Tax Expense (Benefit)	0	0	0	2
Loss before earnings losses from unconsolidated entities	33	(34)	19	5
Earnings (losses) from unconsolidated entities	(2)	(2)	3	(15)
Net Income (Loss)	31	(36)	22	(10)
Comprehensive loss	34	(34)	(17)	(23)
Non-guarantor subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Net sales	473	505	922	986
Cost of Goods Sold	400		784
Costs and expenses:
Cost of sales, excluding depreciation		404		789
Selling, General and Administrative Expense, Including Restructuring Costs	53	31	83	59
Depreciation and amortization expenses		25		49
Research and Development Expense	$ 7	7	14	15
Restructuring Charges		0	0	2
Other Operating Income	$ (5)		(2)
Operating (loss) income	8	38	39	72
Other income (expense):
Interest expense	15	28	34	70
Nonoperating Income (Expense)	0		2
Reorganization Items	0		0
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest	(7)	10	7	2
Income Tax Expense (Benefit)	(5)	13	5	19
Loss before earnings losses from unconsolidated entities	(2)	(3)	2	(17)
Earnings (losses) from unconsolidated entities	0	1	1	2
Net Income (Loss)	(2)	(2)	3	(15)
Comprehensive loss	(8)	1	1	(27)
Eliminations [Member]
Condensed Financial Statements, Captions [Line Items]
Net sales	(149)	(162)	(294)	(303)
Cost of Goods Sold	(149)		(294)
Costs and expenses:
Cost of sales, excluding depreciation		(162)		(303)
Selling, General and Administrative Expense, Including Restructuring Costs	0	0	0	0
Depreciation and amortization expenses		0		0
Research and Development Expense	0	0	0	0
Restructuring Charges	0	0	0	0
Other Operating Income	0		0
Operating (loss) income	0	0	0	0
Other income (expense):
Interest expense	0	0	0	0
Nonoperating Income (Expense)	0		0
Reorganization Items	0		0
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest	0	0	0	0
Income Tax Expense (Benefit)	0	0	0	0
Loss before earnings losses from unconsolidated entities	0	0	0	0
Earnings (losses) from unconsolidated entities	(29)	38	(25)	25
Net Income (Loss)	(29)	38	(25)	25
Comprehensive loss	(26)	33	16	50
MPM Inc [Member]
Condensed Financial Statements, Captions [Line Items]
Net sales	602	637	1,181	1,242
Cost of Goods Sold	490		969
Costs and expenses:
Cost of sales, excluding depreciation		460		894
Selling, General and Administrative Expense, Including Restructuring Costs	60	89	134	168
Depreciation and amortization expenses		42		83
Research and Development Expense	18	19	36	39
Restructuring Charges	5	10	9	14
Other Operating Income	2	0	5	0
Operating (loss) income	27	17	38	44
Other income (expense):
Interest expense	20	41	39	117
Other non-operating expense (income), net	2	0	(2)	0
Nonoperating Income (Expense)	2		(2)
Reorganization Items	2	70	7	70
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest	7	(94)	(10)	(143)
Income Tax Expense (Benefit)	(5)	13	5	21
Loss before earnings losses from unconsolidated entities	12	(107)	(15)	(164)
Earnings (losses) from unconsolidated entities	0	1	1	2
Net Income (Loss)	12	(106)	(14)	(162)
Comprehensive loss	$ 16	$ (105)	$ (53)	$ (175)