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INTERIM FINANCIAL INFORMATION (UNAUDITED) (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]                      
Net sales $ 1,860 $ 1,983 $ 1,764 $ 1,581 $ 1,639 $ 1,716 $ 1,839 $ 1,513 $ 7,188 $ 6,707 $ 6,654
Gross profit 660 752 628 547 565 611 673 522 2,587 2,371 2,327
Income from continuing operations 192 275 210 133 158 163 211 107 810 639 636
Net income attributable to Masco Corporation $ 195 $ 275 $ 224 $ 530 $ 453 $ 126 $ 240 $ 116 $ 1,224 $ 935 $ 734
Basic:                      
Income from continuing operations (in dollars per share) $ 0.74 $ 1.05 $ 0.80 $ 0.49 $ 0.56 $ 0.57 $ 0.73 $ 0.36 $ 3.05 $ 2.21 $ 2.06
Net income, basic (in dollars per share) 0.75 1.05 0.85 1.93 1.60 0.44 0.82 0.39 4.60 3.24 2.38
Diluted:                      
Income from continuing operations (in dollars per share) 0.73 1.05 0.80 0.48 0.56 0.56 0.72 0.36 3.04 2.20 2.05
Net income, diluted (in dollars per share) $ 0.74 $ 1.05 $ 0.85 $ 1.92 $ 1.59 $ 0.44 $ 0.82 $ 0.39 $ 4.59 $ 3.22 $ 2.37
Income from discontinued operations, net   $ (37)   $ 397 $ 295       $ 414 $ 296 $ 98