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DIVESTITURES - Narrative (Details) - USD ($) $ in Millions |  |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Feb. 18, 2020 | Nov. 06, 2019 | Sep. 06, 2019 | Jun. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Businesses, net of cash disposed |  |  |  |  | $ 870 | $ 722 | $ 0
Gain (loss) on disposition of business |  |  |  |  | 602 | 298 | 0
Discontinued Operations, Disposed of by Sale |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Gain on disposal of discontinued operations, net |  |  |  |  | 602 | 298 | 0
Income (loss) from discontinued operation, before income tax |  |  |  |  | 597 | 404 | 135
UK Window Group | Discontinued Operations, Disposed of by Sale |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Businesses, net of cash disposed |  |  | $ 8 |  |  |  |
Business, net of cash disposed |  |  | 2 |  |  |  |
Discontinued operation, consideration |  |  | $ 6 |  |  |  |
Period of consideration to be collected |  |  | 2 years |  |  |  |
Gain (loss) on disposition of business |  |  |  |  |  | 70 |
Milgard Manufacturing Inc | Discontinued Operations, Disposed of by Sale |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Business, net of cash disposed |  | $ 720 |  |  | 17 |  |
Gain (loss) on disposition of business |  |  |  |  |  | 368 |
Gain on disposal of discontinued operations, net |  |  |  | $ 17 |  |  |
Masco Cabinetry | Discontinued Operations, Disposed of by Sale |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Business, net of cash disposed | $ 989 |  |  |  |  |  |
Gain (loss) on disposition of business |  |  |  |  | 585 |  |
Masco Cabinetry | Discontinued Operations, Disposed of by Sale | ACProducts Preferred Stock |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Other assets acquired | 136 |  |  |  |  |  |
Masco Cabinetry | Discontinued Operations, Disposed of by Sale | Cash |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Business, net of cash disposed | $ 853 |  |  |  |  |  |
Milgard and UKWG | Discontinued Operations, Disposed of by Sale |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Income (loss) from discontinued operation, before income tax |  |  |  |  | 2 | (1) | 40
Cabinetry Products | Discontinued Operations, Disposed of by Sale |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Income (loss) from discontinued operation, before income tax |  |  |  |  | $ (7) | $ 107 | $ 95

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