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Financing Agreements - Schedule of Long-term Debt (Details) - USD ($) $ in Millions	Jun. 30, 2026	Jun. 12, 2026	Jun. 03, 2026	Mar. 02, 2026	Dec. 31, 2025	May 21, 2025
Debt Instrument [Line Items]
Long-term debt	$ 2,103				$ 2,104
Less: Current portion of long-term debt	153				586
Total long-term debt, excluding current portion	$ 1,950				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%
Debt instrument face amount	$ 0
Long-term debt	$ 0	$ 447			447
Senior Notes \| 5.0% Senior Notes, due 2034
Debt Instrument [Line Items]
Annual interest rate on debt	5.00%
Debt instrument face amount	$ 400
Long-term debt	$ 396				396
Senior Notes \| SixPointZeroOneTwoPercentSeniorNotesDue2025Member [Member]
Debt Instrument [Line Items]
Annual interest rate on debt	6.012%		6.012%
Debt instrument face amount				$ 50
Senior Notes \| Five Point Zero Five Percent Senior Notes, Due 2036
Debt Instrument [Line Items]
Annual interest rate on debt	5.05%			5.05%
Debt instrument face amount	$ 400			$ 400
Long-term debt	$ 395				0
Senior Notes \| 5.7% Senior Notes, due 2043
Debt Instrument [Line Items]
Annual interest rate on debt	5.70%
Debt instrument face amount	$ 400
Long-term debt	$ 396				396
Senior Notes \| 4.8% Senior Notes, due 2046
Debt Instrument [Line Items]
Annual interest rate on debt	4.80%
Debt instrument face amount	$ 300
Long-term debt	298				297
Junior Subordinated Notes \| SixPointZeroOneTwoPercentSeniorNotesDue2025Member [Member]
Debt Instrument [Line Items]
Debt instrument face amount	50
Long-term debt	$ 50				0
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%
Debt instrument face amount	$ 340
Long-term debt	$ 337				336
Debentures \| 7.63% Voya Holdings Inc. debentures, due 2026
Debt Instrument [Line Items]
Annual interest rate on debt	7.625%
Debt instrument face amount	$ 139
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%
Debt instrument face amount	$ 78
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%
Debt instrument face amount	$ 13
Long-term debt	$ 13				13
Loans payable \| 1.00% Windsor Property Loan
Debt Instrument [Line Items]
Annual interest rate on debt	1.00%
Debt instrument face amount	$ 0
Long-term debt	$ 0				$ 1