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Financing Agreements - Schedule of Long-term Debt (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025	May 21, 2025
Debt Instrument [Line Items]
Long-term debt	$ 2,500	$ 2,104
Less: Current portion of long-term debt	587	586
Total long-term debt, excluding current portion	$ 1,913	1,518
Senior Notes
Debt Instrument [Line Items]
Annual interest rate on debt			1.518%
Senior Notes \| 3.65% Senior Notes, due 2026
Debt Instrument [Line Items]
Annual interest rate on debt	3.65%
Long-term debt	$ 447	447
Senior Notes \| 5.0% Senior Notes, due 2034
Debt Instrument [Line Items]
Annual interest rate on debt	5.00%
Long-term debt	$ 396	396
Senior Notes \| Five Point Zero Five Percent Senior Notes, Due 2036
Debt Instrument [Line Items]
Annual interest rate on debt	5.05%
Long-term debt	$ 395	0
Senior Notes \| 5.7% Senior Notes, due 2043
Debt Instrument [Line Items]
Annual interest rate on debt	5.70%
Long-term debt	$ 396	396
Senior Notes \| 4.8% Senior Notes, due 2046
Debt Instrument [Line Items]
Annual interest rate on debt	4.80%
Long-term debt	$ 298	297
Junior Subordinated Notes \| Four Point Seven Percent Fixed-to-Floating Rate Junior Subordinated Notes, due 2048 [Member]
Debt Instrument [Line Items]
Annual interest rate on debt	4.70%
Long-term debt	$ 336	336
Debentures \| 7.63% Voya Holdings Inc. debentures, due 2026
Debt Instrument [Line Items]
Annual interest rate on debt	7.625%
Long-term debt	$ 139	139
Debentures \| 6.97% Voya Holdings Inc. debentures, due 2036
Debt Instrument [Line Items]
Annual interest rate on debt	6.97%
Long-term debt	$ 79	79
Notes payable, other \| 8.42% Equitable of Iowa Companies Capital Trust II Notes, due 2027
Debt Instrument [Line Items]
Annual interest rate on debt	8.424%
Long-term debt	$ 13	13
Loans payable \| 1.00% Windsor Property Loan
Debt Instrument [Line Items]
Annual interest rate on debt	1.00%
Long-term debt	$ 1	$ 1