INTERIM FINANCIAL INFORMATION (UNAUDITED) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]
Income from discontinued operations, net	$ 295	$ (37)							$ 296	$ 98	$ 107
Net sales	1,639	1,716	$ 1,839	$ 1,513	$ 1,635	$ 1,665	$ 1,838	$ 1,516	6,707	6,654	6,014
Gross profit	565	611	673	522	568	570	648	541	2,371	2,327	2,220
Income from continuing operations	158	163	211	107	172	150	178	136	639	636	426
Net income attributable to Masco Corporation	$ 453	$ 126	$ 240	$ 116	$ 194	$ 180	$ 211	$ 149	$ 935	$ 734	$ 533
Income from continuing operations (in dollars per share)	$ 0.56	$ 0.57	$ 0.73	$ 0.36	$ 0.57	$ 0.49	$ 0.58	$ 0.43	$ 2.21	$ 2.06	$ 1.34
Basic:
Net income, basic (in dollars per share)	1.60	0.44	0.82	0.39	0.65	0.59	0.69	0.48	3.24	2.38	1.68
Income from continuing operations (in dollars per share)	0.56	0.56	0.72	0.36	0.57	0.49	0.57	0.43	2.20	2.05	1.33
Diluted:
Net income, diluted (in dollars per share)	$ 1.59	$ 0.44	$ 0.82	$ 0.39	$ 0.64	$ 0.58	$ 0.68	$ 0.47	$ 3.22	$ 2.37	$ 1.66