EARNINGS PER SHARE (DETAIL) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended			3 Months Ended	9 Months Ended		3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Apr. 25, 2012 Repurchase Program 2012	Sep. 30, 2013 Restricted Stock	Sep. 30, 2014 Restricted Stock	Sep. 30, 2013 Restricted Stock	Sep. 30, 2014 Equity Option	Sep. 30, 2013 Equity Option	Sep. 30, 2013 Equity Option	Sep. 30, 2013 Series A Warrants	Sep. 30, 2013 Series B Warrants
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount						200,000	1,000,000	200,000	1,300,000	1,000,000	700,000	17,500,000	7,800,000
Equity Class Of Treasury Stock [Line Items]
Stock Repurchase Program, Number of Shares Authorized to be Repurchased					10,000,000
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased	7,700,000		7,700,000
Net earnings attributable to Owens Corning	$ 52	$ 51	$ 193	$ 122
Weighted-average number of shares outstanding used for basic earnings per share	117,400,000	118,000,000	117,500,000	118,400,000
Non-vested restricted and performance shares	400,000	400,000	400,000	400,000
Options to purchase common stock	300,000	400,000	400,000	500,000
Weighted-average number of shares outstanding and common equivalent shares used for diluted earnings per share	118,100,000	118,800,000	118,300,000	119,300,000
Basic (in dollars per share)	$ 0.44	$ 0.43	$ 1.64	$ 1.03
Diluted (in dollars per share)	$ 0.44	$ 0.43	$ 1.63	$ 1.02