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Financing Agreements - Additional Information (Details) - USD ($) $ in Millions			12 Months Ended
	May 21, 2025	Mar. 17, 2015	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	May 01, 2023	Jan. 23, 2018
Debt Instrument [Line Items]
Long-term debt			$ 2,104	$ 2,502
Business agreement, term of agreement	10 years	10 years
Put option agreement, face amount		$ 500	100
Revolving Credit Agreement
Debt Instrument [Line Items]
Utilization			0
Aetna Notes
Debt Instrument [Line Items]
Amounts of LOCs outstanding				12
Revolving Credit Agreement
Debt Instrument [Line Items]
Capacity			$ 500
Minimum net worth required for compliance						$ 4,998
Voya Holdings Debentures \| Aetna Notes
Debt Instrument [Line Items]
Quarterly fee to guarantor of notes if minimum principal balance is not met			1.25%
Collateral amount			$ 229	227
Cash collateral deposited for debt			229	215
Voya Holdings Debentures \| Aetna Notes \| Minimum
Debt Instrument [Line Items]
Collateral amount			218	218
Short-Term Debt \| Revolving Credit Agreement
Debt Instrument [Line Items]
Capacity						$ 25
Senior Notes
Debt Instrument [Line Items]
Annual interest rate on loan	1.518%
Senior Notes \| 5.0% Senior Notes, due 2034
Debt Instrument [Line Items]
Long-term debt			396	395
Senior Notes \| 3.976% Senior Notes, due 2025
Debt Instrument [Line Items]
Amount of unsecured notes issued			$ 400
Annual interest rate on loan			3.976%
Long-term debt			$ 0	399
Senior Notes \| Pre-Capitalized Trust
Debt Instrument [Line Items]
Annual interest rate on loan	6.012%	3.976%
Junior Subordinated Notes
Debt Instrument [Line Items]
Maximum deferral period for one or more consecutive interest payments			5 years
Junior Subordinated Notes \| 4.7% Fixed-to-Floating Rate Junior Subordinated Notes, due 2048
Debt Instrument [Line Items]
Amount of unsecured notes issued							$ 340
Annual interest rate on loan			4.70%				4.70%
Long-term debt			$ 336	336
Debentures \| 7.63% Voya Holdings Inc. debentures, due 2026
Debt Instrument [Line Items]
Annual interest rate on loan			7.625%
Long-term debt			$ 139	139
Debentures \| 6.97% Voya Holdings Inc. debentures, due 2036
Debt Instrument [Line Items]
Annual interest rate on loan			6.97%
Long-term debt			$ 79	79
Debentures \| Voya Holdings Debentures
Debt Instrument [Line Items]
Long-term debt			218	218
Revolving Credit Agreement
Debt Instrument [Line Items]
Amounts of LOCs outstanding			0
Utilization			0
Interest expense \| Debt securities
Debt Instrument [Line Items]
Loss on extinguishment of debt			$ 0	$ 0	$ (5)