Financing Agreements - Long-term Debt (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023	Jan. 23, 2018	Mar. 17, 2015
Debt Instrument [Line Items]
Total	$ 2,502	$ 2,098
Current portion of long-term debt	399	1
Long-term debt	$ 2,103	2,097
Senior Notes
Debt Instrument [Line Items]
Annual interest rate on loan				1.875%
3.976% Senior Notes, due 2025 | Senior Notes
Debt Instrument [Line Items]
Annual interest rate on loan	3.976%
Total	$ 399	$ 390
3.65% Senior Notes, due 2026 | Senior Notes
Debt Instrument [Line Items]
Annual interest rate on loan	3.65%	3.65%
Total	$ 446	$ 446
5.0% Senior Notes, due 2034 | Senior Notes
Debt Instrument [Line Items]
Annual interest rate on loan	5.00%
Total	$ 395	$ 0
5.7% Senior Notes, due 2043 | Senior Notes
Debt Instrument [Line Items]
Annual interest rate on loan	5.70%	5.70%
Total	$ 396	$ 396
4.8% Senior Notes, due 2046 | Senior Notes
Debt Instrument [Line Items]
Annual interest rate on loan	4.80%	4.80%
Total	$ 297	$ 297
4.7% Fixed-to-Floating Rate Junior Subordinated Notes, due 2048 | Junior Subordinated Notes
Debt Instrument [Line Items]
Annual interest rate on loan	4.70%	4.70%	4.70%
Total	$ 336	$ 336
7.63% Voya Holdings Inc. debentures, due 2026 | Debentures
Debt Instrument [Line Items]
Annual interest rate on loan	7.625%	7.625%
Total	$ 139	$ 139
6.97% Voya Holdings Inc. debentures, due 2036 | Debentures
Debt Instrument [Line Items]
Annual interest rate on loan	6.97%	6.97%
Total	$ 79	$ 79
8.42% Equitable of Iowa Companies Capital Trust II Notes, due 2027 | Notes Payable
Debt Instrument [Line Items]
Annual interest rate on loan	8.42%	8.42%
Total	$ 13	$ 13
1.00% Windsor Property Loan | Property Loan
Debt Instrument [Line Items]
Annual interest rate on loan	1.00%	1.00%
Total	$ 2	$ 2