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Divestitures - Narrative (Details)
$ in Millions
9 Months Ended
Feb. 18, 2020
USD ($)
Nov. 06, 2019
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
installment
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Businesses, net of cash disposed     $ 5 $ 868
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     0 602
Income before income tax, discontinued operations     $ 0 594
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 $ 989      
Proceeds from divestiture 853      
Gain (loss) on disposition of business       $ 585
Milgard        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Number of installments | installment       2
Milgard | 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   $ 720   $ 15
Gain on disposal of discontinued operations       17
Short term receivable from divestiture of businesses, payable in five monthly installments       $ 2
ACProducts Preferred Stock | Masco Cabinetry | Discontinued Operations, Disposed of by Sale        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Proceeds from divestiture of businesses $ 136