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Related Party Transactions - Financing Agreements (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 29, 2004
Related Party Transaction [Line Items]
Short-term loan to affiliate	$ 0	$ 80,000,000
Due to Related Parties	$ 73,000,000	61,000,000
Affiliated entity \| Reciprocal Loan Agreement \| Voya Financial, Inc.
Related Party Transaction [Line Items]
Maximum borrowing capacity, percentage	3.00%
Short-term loan to affiliate	$ 0	80,000,000
Due to Related Parties	0	0
Affiliated entity \| Surplus Notes \| Voya Insurance and Annuity Company (VIAC)
Related Party Transaction [Line Items]
Interest income, related party	$ 5,000,000	$ 11,000,000	$ 11,000,000
Debt instrument, face amount				$ 175,000,000
Annual interest rate on loan				6.26%