Document and Entity Information	3 Months Ended
	Mar. 31, 2019 shares
Document and Entity Information [Abstract]
Entity Registrant Name	MASCO CORP /DE/
Entity Central Index Key	0000062996
Document Type	10-Q
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Period End Date	Mar. 31, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q1
Amendment Flag	false
Entity Common Stock, Shares Outstanding (in shares)	293,548,874
Entity Emerging Growth Company	false
Entity Small Business	false