CONSOLIDATED STATEMENTS OF EARNINGS - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Income Statement [Abstract]
NET SALES	$ 2,346	$ 1,915
COST OF SALES	1,727	1,471
Gross margin	619	444
OPERATING EXPENSES
Marketing and administrative expenses	184	174
Science and technology expenses	23	20
Other income, net	(28)	(48)
Total operating expenses	179	146
OPERATING INCOME	440	298
Non-operating income	(2)	(3)
EARNINGS BEFORE INTEREST AND TAXES	442	301
Interest expense, net	28	33
EARNINGS BEFORE TAXES	414	268
Income tax expense	107	59
Equity in net earnings of affiliates	0	1
NET EARNINGS	307	210
Net earnings attributable to noncontrolling interests	3	0
NET EARNINGS ATTRIBUTABLE TO OWENS CORNING	$ 304	$ 210
EARNINGS PER COMMON SHARE ATTRIBUTABLE TO OWENS CORNING COMMON STOCKHOLDERS
Basic (in dollars per share)	$ 3.06	$ 1.99
Diluted (in dollars per share)	$ 3.03	$ 1.98
WEIGHTED AVERAGE COMMON SHARES
Basic (in shares)	99.5	105.4
Diluted (in shares)	100.2	106.0