CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $) In Millions, except Share data, unless otherwise specified	Total	Common Stock Outstanding [Member]	Treasury Stock [Member]	Additional Paid In Capital [Member]		Accumulated Earnings (Deficit) [Member]	Accumulated Other Comprehensive Income [Member]		Noncontrolling Interest [Member]
Beginning Balance at Dec. 31, 2011	$ 3,741	$ 1	$ (362)	$ 3,907	[1]	$ 470	$ (315)	[2]	$ 40	[3]
Beginning Balance (in shares) at Dec. 31, 2011		120,900,000	13,500,000
Increase Decrease In Stockholders Equity [Roll Forward]
Net earnings (loss) attributable to Owens Corning	(16)					(19)			3	[3]
Currency translation adjustment	5						5	[2]
Pension and other postretirement adjustment (net of tax)	(56)						(56)	[2]
Deferred gain on hedging transactions (net of tax)	2						2	[2]
Total comprehensive earnings	(65)
Changes in subsidiary shares from noncontrolling interests	(22)			(16)	[1]				(6)	[3]
Stock issuance (in shares)	520,120	500,000
Stock issuance	11			11	[1]
Purchases of treasury stock	(113)		(113)
Purchase of treasury stock (in shares)		3,800,000	3,800,000
Stock-based compensation	23			23	[1]
Stock-based compensation (in shares)		700,000
Ending Balance at Dec. 31, 2012	3,575	1	(475)	3,925	[1]	451	(364)	[2]	37	[3]
Ending Balance (in shares) at Dec. 31, 2012		118,300,000	17,300,000
Increase Decrease In Stockholders Equity [Roll Forward]
Net earnings (loss) attributable to Owens Corning	205					204			1	[3]
Currency translation adjustment	(29)						(28)	[2]	(1)	[3]
Pension and other postretirement adjustment (net of tax)	94						94	[2]
Deferred gain on hedging transactions (net of tax)	1						1	[2]
Total comprehensive earnings	271
Stock issuance (in shares)	549,800	500,000	600,000
Stock issuance	16		17	(1)	[1]
Purchases of treasury stock	(63)		(63)
Purchase of treasury stock (in shares)		1,600,000	1,600,000
Stock-based compensation	31		17	14	[1]
Stock-based compensation (in shares)		600,000	600,000
Ending Balance at Dec. 31, 2013	3,830	1	(504)	3,938	[1]	655	(297)	[2]	37	[3]
Ending Balance (in shares) at Dec. 31, 2013		117,800,000	17,700,000
Increase Decrease In Stockholders Equity [Roll Forward]
Net earnings (loss) attributable to Owens Corning	228					226			2
Currency translation adjustment	(135)						(134)		(1)
Pension and other postretirement adjustment (net of tax)	(113)						(113)
Deferred gain on hedging transactions (net of tax)	(6)						(6)
Total comprehensive earnings	(26)
Changes in subsidiary shares from noncontrolling interests	(6)
Stock issuance (in shares)	328,875	300,000	300,000
Stock issuance	14		30	(16)	[1]
Purchases of treasury stock	(44)		(44)
Purchase of treasury stock (in shares)		1,000,000	1,000,000
Stock-based compensation	32			32	[1]
Stock-based compensation (in shares)		700,000	700,000
Dividends declared	(76)					(76)
Ending Balance at Dec. 31, 2014	$ 3,730	$ 1	$ (518)	$ 3,954	[1]	$ 805	$ (550)	[2]	$ 38	[3]
Ending Balance (in shares) at Dec. 31, 2014		117,800,000	17,700,000

[1] Additional Paid in Capital (“APIC”)

[2] Accumulated Other Comprehensive Earnings (Deficit) (“AOCI”)

[3] Noncontrolling Interest (“NCI”)