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ACCOUNTING POLICIES - Recently Issued Accounting Pronouncements (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended
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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
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 2,041 | $ 2,101 | $ 2,297 | $ 1,920 | $ 1,853 | $ 1,945 | $ 2,066 | $ 1,778 | $ 8,359 | $ 7,642 | $ 7,361
Operating Profit (Loss) |  |  |  |  |  |  |  |  | 1,211 | 1,194 | 1,087
Net income attributable to Masco Corporation | $ 194 | $ 180 | $ 211 | $ 149 | $ 80 | $ 152 | $ 163 | $ 138 | $ 734 | $ 533 | $ 493
Income per common share attributable to Masco Corporation: |  |  |  |  |  |  |  |  |  |  |
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
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
Recently Issued Accounting Pronouncements |  |  |  |  |  |  |  |  |  |  |
Reclassification from AOCI, Current Period, Tax |  |  |  | $ 59 |  |  |  |  |  |  |
Accounting Standards Update 2014-09 |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  | $ (2) | $ 4
Operating Profit (Loss) |  |  |  |  |  |  |  |  |  | (1) | 2
Accounting Standards Update 2017-07 |  |  |  |  |  |  |  |  |  |  |
Recently Issued Accounting Pronouncements |  |  |  |  |  |  |  |  |  |  |
Non-operating income (expense), expected to be adjusted |  |  |  |  |  |  |  |  |  | 26 | 32
Previous Accounting Guidance |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating Profit (Loss) |  |  |  |  |  |  |  |  |  | 1,169 | 1,053
Net income attributable to Masco Corporation |  |  |  |  |  |  |  |  |  | $ 533 | $ 491
Income per common share attributable to Masco Corporation: |  |  |  |  |  |  |  |  |  |  |
Net income, basic (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 1.68 | $ 1.49
Net income, diluted (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 1.66 | $ 1.47
Plumbing Products |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | $ 3,998 | $ 3,732 | $ 3,529
Decorative Architectural Products |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 2,656 | 2,206 | 2,092
Cabinetry Products |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 950 | 934 | 970
Windows and Other Specialty Products |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 755 | 770 | 770
Operating Segments |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 8,359 | 7,642 | 7,361
Operating Profit (Loss) |  |  |  |  |  |  |  |  | 1,291 | 1,286 | 1,181
Operating Segments | Previous Accounting Guidance |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  | 7,644 | 7,357
Operating Profit (Loss) |  |  |  |  |  |  |  |  |  | 1,274 | 1,162
Operating Segments | Plumbing Products |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 3,998 | 3,732 | 3,529
Operating Profit (Loss) |  |  |  |  |  |  |  |  | 715 | 702 | 654
Operating Segments | Plumbing Products | Previous Accounting Guidance |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  | 3,735 | 3,526
Operating Profit (Loss) |  |  |  |  |  |  |  |  |  | 698 | 642
Operating Segments | Decorative Architectural Products |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 2,656 | 2,206 | 2,092
Operating Profit (Loss) |  |  |  |  |  |  |  |  | 456 | 438 | 433
Operating Segments | Decorative Architectural Products | Previous Accounting Guidance |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  | 2,205 | 2,092
Operating Profit (Loss) |  |  |  |  |  |  |  |  |  | 434 | 430
Operating Segments | Cabinetry Products |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 950 | 934 | 970
Operating Profit (Loss) |  |  |  |  |  |  |  |  | 86 | 92 | 97
Operating Segments | Cabinetry Products | Previous Accounting Guidance |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  | 934 | 970
Operating Profit (Loss) |  |  |  |  |  |  |  |  |  | 90 | 93
Operating Segments | Windows and Other Specialty Products |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 755 | 770 | 770
Operating Profit (Loss) |  |  |  |  |  |  |  |  | 34 | 54 | (3)
Operating Segments | Windows and Other Specialty Products | Previous Accounting Guidance |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  | 770 | 769
Operating Profit (Loss) |  |  |  |  |  |  |  |  |  | 52 | (3)
Corporate, Non-Segment |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
General corporate expense, net |  |  |  |  |  |  |  |  | $ (80) | (92) | (94)
Corporate, Non-Segment | Previous Accounting Guidance |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
General corporate expense, net |  |  |  |  |  |  |  |  |  | $ (105) | $ (109)

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