Condensed Consolidating Financial Information - Narrative (Details)	Jun. 30, 2018	Jan. 23, 2018	Dec. 31, 2017
5.5% Senior Notes, due 2022 | Senior Notes
Debt Instrument [Line Items]
Annual interest rate on debt	5.50%		5.50%
5.7% Senior Notes, due 2043 | Senior Notes
Debt Instrument [Line Items]
Annual interest rate on debt	5.70%		5.70%
3.65% Senior Notes, due 2026 | Senior Notes
Debt Instrument [Line Items]
Annual interest rate on debt	3.65%		3.65%
4.8% Senior Notes, due 2046 | Senior Notes
Debt Instrument [Line Items]
Annual interest rate on debt	4.80%		4.80%
3.125% Senior Notes, due 2024 | Senior Notes
Debt Instrument [Line Items]
Annual interest rate on debt	3.125%		3.125%
5.65% Fixed-to-Floating Rate Junior Subordinated Notes, due 2053 | Junior Subordinated Notes
Debt Instrument [Line Items]
Annual interest rate on debt	5.65%		5.65%
4.7% Fixed-to-Floating Rate Junior Subordinated Notes, due 2048 | Junior Subordinated Notes
Debt Instrument [Line Items]
Annual interest rate on debt	4.70%	4.70%
Voya Holdings Inc.
Debt Instrument [Line Items]
Ownership percentage by the company	100.00%