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Financing Agreements - Narrative (Details) - USD ($) $ in Millions			9 Months Ended
	May 21, 2025	Mar. 17, 2015	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024	May 01, 2023
Debt Instrument [Line Items]
Outstanding par amount of guaranteed debentures			$ 2,104		$ 2,502
Total fees associated with credit facilities			0	$ 0
Business agreement processing and operation services period	10 years	10 years
Put option face amount		$ 500	100
Facility Agreement, Face Amount	$ 600
Revolving Credit agreement
Debt Instrument [Line Items]
Outstanding borrowings			0
Revolving Credit agreement
Debt Instrument [Line Items]
Maximum borrowing capacity			500
Minimum net worth required for compliance						$ 4,998
Senior Notes
Debt Instrument [Line Items]
Annual interest rate on debt	1.5175%
Revolving Credit agreement
Debt Instrument [Line Items]
Amount of letters of credit outstanding			0
Outstanding borrowings			0
5.0% Senior Notes, due 2034 | Senior Notes
Debt Instrument [Line Items]
Debt instrument face amount			$ 400
Annual interest rate on debt			5.00%
Net proceeds			$ 397
Outstanding par amount of guaranteed debentures			396		395
3.976% Senior Notes, Due 2025 | Senior Notes
Debt Instrument [Line Items]
Debt instrument face amount			$ 400
Annual interest rate on debt			3.976%
Outstanding par amount of guaranteed debentures			$ 0		399
7.63% Voya Holdings Inc. debentures, due 2026 | Debentures
Debt Instrument [Line Items]
Annual interest rate on debt			7.625%
Outstanding par amount of guaranteed debentures			$ 139		139
6.97% Voya Holdings Inc. debentures, due 2036 | Debentures
Debt Instrument [Line Items]
Annual interest rate on debt			6.97%
Outstanding par amount of guaranteed debentures			$ 79		$ 79
Voya Holdings Debentures | Aetna Notes
Debt Instrument [Line Items]
Amount of collateral for credit facility			227
Voya Holdings Debentures | Debentures
Debt Instrument [Line Items]
Outstanding par amount of guaranteed debentures			$ 218
Pre-Capitalized Trust | Senior Notes
Debt Instrument [Line Items]
Annual interest rate on debt	6.012%	3.976%
Short-term Debt | Revolving Credit agreement
Debt Instrument [Line Items]
Maximum borrowing capacity						$ 25

X

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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 14
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-14

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