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Divestitures - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2021 | Sep. 30, 2020 | Mar. 31, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Businesses, net of cash disposed | $ 0 |  | $ 853
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 | 0 |  | 585
Income before income tax, discontinued operations | $ 0 |  | 576
Masco Cabinetry | Discontinued Operations, Held-for-sale |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Businesses, net of cash disposed |  | $ 989 |
Gain (loss) on disposition of business |  |  | $ 585
Cash and Cash Equivalents | Masco Cabinetry | 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 |  | 853 |
ACProducts Preferred Stock | Masco Cabinetry | Discontinued Operations, Held-for-sale |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Proceeds from divestiture of businesses |  | $ 136 |

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