| Document and Entity Information | Feb. 19, 2021 |
| Cover [Abstract] | |
| Entity Registrant Name | MASCO CORP /DE/ |
| Amendment Flag | false |
| Entity Central Index Key | 0000062996 |
| Document Type | 8-K |
| Document Period End Date | Feb. 19, 2021 |
| Entity Incorporation State Country Code | DE |
| Entity File Number | 1-5794 |
| Entity Tax Identification Number | 38-1794485 |
| Entity Address, Address Line One | 17450 College Parkway |
| Entity Address, City or Town | Livonia |
| Entity Address, State or Province | MI |
| Entity Address, Postal Zip Code | 48152 |
| City Area Code | (313) |
| Local Phone Number | 274-7400 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Security 12b Title | Common Stock, $1.00 par value |
| Trading Symbol | MAS |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | false |
