Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2019	Mar. 10, 2020	Jun. 30, 2019	Dec. 31, 2018
Entity Information [Line Items]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2019
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 Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Company	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Public Float			$ 0
Entity Common Stock, Shares Outstanding		55,000
Common stock, par value	$ 50	$ 50		$ 50
Entity Central Index Key	0000837010
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	FY
Amendment Flag	false