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Insurance Subsidiaries - Dividends Restrictions and Approved Distributions (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2020
Statutory Accounting Practices [Line Items]
Dividends Paid	$ 44	$ 6	$ 8
Insurance Laws Applicable to Insurance Subsidiaries in Connecticut, Indiana. Iowa, and Minnesota
Statutory Accounting Practices [Line Items]
Percentage threshold of dividends paid in previous twelve months to earned statutory surplus of prior year end, requiring approval of payment of dividends if exceeded	10.00%
Insurance Laws Applicable to Insurance Subsidiaries in Colorado
Statutory Accounting Practices [Line Items]
Percentage threshold of dividends paid in previous twelve months to earned statutory surplus of prior year end, requiring approval of payment of dividends if exceeded	10.00%
Subsidiaries \| Voya Retirement Insurance and Annuity Company (VRIAC) (CT) \| Connecticut
Statutory Accounting Practices [Line Items]
Dividends Permitted without Approval	$ 396			$ 295
Dividends Paid	396	126
Extraordinary Distributions Paid	0	0
Subsidiaries \| Security Life of Denver Insurance Company (CO) \| Colorado
Statutory Accounting Practices [Line Items]
Dividends Permitted without Approval	0			0
Dividends Paid	0	52
Extraordinary Distributions Paid	0	0
Subsidiaries \| ReliaStar Life Insurance Company (RLI) (MN) \| Minnesota
Statutory Accounting Practices [Line Items]
Dividends Permitted without Approval	0			$ 0
Dividends Paid	0	0
Extraordinary Distributions Paid	$ 360	$ 0