Financing Agreements (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Interest expense	$ 2	$ 3	$ 1
Voya Financial, Inc. | Reciprocal Loan Agreement | Affiliated entity
Debt Instrument [Line Items]
Maximum borrowing capacity, percentage	3.00%
Interest expense	$ 2	3	1
Interest Income, Operating	20	18	$ 5
Other Receivables	100	295
Voya Financial, Inc. | Reciprocal Loan Agreement | Loans Payable
Debt Instrument [Line Items]
Accounts Payable, Other	$ 44	$ 31