| Document and Entity Information | Dec. 14, 2020 |
| Cover [Abstract] | |
| Amendment Flag | false |
| Entity Central Index Key | 0001740332 |
| Document Type | 8-K |
| Document Period End Date | Dec. 14, 2020 |
| Entity Registrant Name | RESIDEO TECHNOLOGIES, INC. |
| Entity Incorporation State Country Code | DE |
| Entity File Number | 001-38635 |
| Entity Tax Identification Number | 82-5318796 |
| Entity Address, Address Line One | 901 East 6th Street |
| Entity Address, City or Town | Austin |
| Entity Address, State or Province | TX |
| Entity Address, Postal Zip Code | 78702 |
| City Area Code | (763) |
| Local Phone Number | 954-5204 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Security 12b Title | Common Stock, $0.001 Par Value |
| Trading Symbol | REZI |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | false |
