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Document And Entity Information - USD ($)
$ in Billions
 12 Months Ended
Dec. 31, 2020
Feb. 19, 2021
Jun. 30, 2020
Cover [Abstract]      
Document Type 10-K    
Document Period End Date Dec. 31, 2020    
Document Fiscal Year Focus 2020    
Document Fiscal Period Focus FY    
Amendment Flag false    
Trading Symbol REZI    
Entity Registrant Name Resideo Technologies, Inc.    
Entity Central Index Key 0001740332    
Current Fiscal Year End Date --12-31    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Common Stock, Shares Outstanding   143,139,475  
Entity Public Float     $ 1.6
Title of 12(b) Security Common Stock, par value $0.001 per share    
Entity File Number 001-38635    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 82-5318796    
Entity Interactive Data Current Yes    
Security Exchange Name NYSE    
Entity Address, Address Line One 901 E. 6th Street    
Entity Address, City or Town Austin    
Entity Address, State or Province TX    
Entity Address, Postal Zip Code     78702    
City Area Code 512    
Local Phone Number 726-3500    
Document Annual Report true    
Document Transition Report false    
ICFR Auditor Attestation Flag true    
Documents Incorporated by Reference

DOCUMENTS INCORPORATED BY REFERENCE

Portions of the registrant’s proxy statement to be filed with the Securities and Exchange Commission pursuant to Regulation 14A in connection with the registrant’s 2021 Annual Meeting of Stockholders, which will be filed subsequent to the date hereof, are incorporated by reference into Part III of this Form 10-K. Such proxy statement will be filed with the Securities and Exchange Commission not later than 120 days following the end of the registrant’s fiscal year ended December 31, 2020.