INTERIM FINANCIAL INFORMATION (UNAUDITED) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]
Net sales	$ 2,041	$ 2,101	$ 2,297	$ 1,920	$ 1,853	$ 1,945	$ 2,066	$ 1,778	$ 8,359	$ 7,642	$ 7,361
Gross profit	653	667	750	619	604	657	746	605	2,689	2,612	2,462
Net income attributable to Masco Corporation	$ 194	$ 180	$ 211	$ 149	$ 80	$ 152	$ 163	$ 138	$ 734	$ 533	$ 493
Basic:
Net income, basic (in dollars per share)	$ 0.65	$ 0.59	$ 0.69	$ 0.48	$ 0.25	$ 0.48	$ 0.51	$ 0.43	$ 2.38	$ 1.68	$ 1.49
Diluted:
Net income, diluted (in dollars per share)	$ 0.64	$ 0.58	$ 0.68	$ 0.47	$ 0.25	$ 0.48	$ 0.51	$ 0.43	$ 2.37	$ 1.66	$ 1.48