Document And Entity Information - shares	3 Months Ended
	Mar. 31, 2020	May 01, 2020
Cover [Abstract]
Document Type	10-Q
Document Period End Date	Mar. 31, 2020
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q1
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 Common Stock, Shares Outstanding		123,148,033
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Shell Company	false
Title of 12(b) Security	Common Stock
Security Exchange Name	NYSE
Entity File Number	001-38635
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	82-5318796
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 Quarterly Report	true
Document Transition Report	false