QUARTERLY FINANCIAL INFORMATION (unaudited) (DETAIL) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Selected Quarterly Financial Information [Abstract]
NET SALES	$ 1,606	$ 1,703	$ 1,597	$ 1,478	$ 1,383	$ 1,518	$ 1,545	$ 1,231	$ 6,384	$ 5,677	$ 5,350
Gross margin	396	424	409	343	319	374	416	272	1,572	1,381	1,153
Net earnings attributable to Owens Corning	$ (4)	$ 96	$ 96	$ 101	$ 86	$ 112	$ 138	$ 57	$ 289	$ 393	$ 330
Basic (dollars per share)	$ (0.04)	$ 0.86	$ 0.86	$ 0.90	$ 0.77	$ 0.98	$ 1.20	$ 0.49	$ 2.59	$ 3.44	$ 2.82
Diluted (dollars per share)	$ (0.04)	$ 0.85	$ 0.85	$ 0.89	$ 0.76	$ 0.97	$ 1.19	$ 0.49	$ 2.55	$ 3.41	$ 2.79