Document and Entity Information - $ / shares	9 Months Ended
	Sep. 30, 2021	Nov. 08, 2021	Dec. 31, 2020
Entity Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2021
Document Transition Report	false
Entity File Number	033-23376
Entity Registrant Name	VOYA RETIREMENT INSURANCE & ANNUITY CO
Entity Incorporation, State or Country Code	CT
Entity Tax Identification Number	71-0294708
Entity Address, Address Line One	One Orange Way
Entity Address, City or Town	Windsor
Entity Address, State or Province	CT
Entity Address, Postal Zip Code	06095-4774
City Area Code	860
Local Phone Number	580-4646
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		55,000
Common stock, par value	$ 50		$ 50
Entity Central Index Key	0000837010
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q3
Amendment Flag	false