Financing Agreements - Narrative (Details) - USD ($) $ in Millions		6 Months Ended
	Mar. 17, 2015	Jun. 30, 2023	May 03, 2023	May 01, 2023	Dec. 31, 2022	May 16, 2013
Debt Instrument [Line Items]
Outstanding par amount of guaranteed debentures		$ 2,238.0			$ 2,235.0
Maximum borrowing capacity		700.0
Line of Credit		163.0
Business Agreement, Processing and Operation Services Period	10 years
Put Option Agreement, Face Amount	$ 500.0
Line of Credit Facility, Remaining Borrowing Capacity		537.0
Payments of Financing Costs		0.0
Aetna Notes
Debt Instrument [Line Items]
Amount of letters of credit outstanding		163.0
Revolving Credit agreement
Debt Instrument [Line Items]
Maximum borrowing capacity		500.0
Minimum net worth required for compliance				$ 4,998.0
Unsecured and Committed [Member] | Voya Financial, Inc.
Debt Instrument [Line Items]
Maximum borrowing capacity		500.0
Line of Credit		0.0
Line of Credit Facility, Remaining Borrowing Capacity		500.0
Unsecured and Committed [Member] | Voya Financial, Inc. Three
Debt Instrument [Line Items]
Maximum borrowing capacity		200.0
Line of Credit		163.0
Line of Credit Facility, Remaining Borrowing Capacity		37.0
Voya Holdings Debentures | Aetna Notes
Debt Instrument [Line Items]
Amount of collateral for credit facility		372.0
Amount of collateral deposited to a control account		209.0
Short-term Debt | Revolving Credit agreement
Debt Instrument [Line Items]
Maximum borrowing capacity				25.0
Revolving Credit agreement
Debt Instrument [Line Items]
Line of Credit		0.0
Debentures | Voya Holdings Debentures
Debt Instrument [Line Items]
Outstanding par amount of guaranteed debentures		358.0
Revolving Credit agreement
Debt Instrument [Line Items]
Amount of letters of credit outstanding		0.0
Line of Credit		0.0
Senior Notes
Debt Instrument [Line Items]
Annual interest rate on debt	1.875%
Senior Notes | Pre-Capitalized Trust
Debt Instrument [Line Items]
Annual interest rate on debt	3.976%
Debt Instrument, Face Amount			$ 400.0	$ 400.0
Junior Subordinated Notes | 5.65% Fixed-to-Floating Rate Junior Subordinated Notes, due 2053
Debt Instrument [Line Items]
Outstanding par amount of guaranteed debentures		$ 0.0			$ 388.0
Annual interest rate on debt		5.65%				5.65%
Debt Instrument, Face Amount		$ 393.0