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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Schedule II - Condensed Financial Information of Parent - Financing Agreements (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Jul. 05, 2017	Jun. 13, 2016	Mar. 17, 2015	Jan. 01, 2014	Jul. 26, 2013	May 16, 2013	Feb. 11, 2013	Jul. 13, 2012
Debt Instrument [Line Items]
Current portion of long-term debt	$ 337.0	$ 0.0
Total	337.0	0.0
Long-term debt	3,460.0	3,550.0
Total	3,123.0	3,550.0
Maturities of Long-term Debt [Abstract]
2018	337.0
2019	1.0
2020	1.0
2021	1.0
2022	364.0
Thereafter	2,792.0
Total	3,496.0
Revolving lines of credit, capacity	6,872.0
Outstanding borrowings	3,197.0
Payments of financing costs	50.0	$ 46.0	$ 89.0
Unsecured and Uncommitted
Maturities of Long-term Debt [Abstract]
Revolving lines of credit, capacity	496.0
Outstanding borrowings	214.0
Unsecured and Committed
Maturities of Long-term Debt [Abstract]
Revolving lines of credit, capacity	6,171.0
Outstanding borrowings	2,787.0
Secured facilities
Maturities of Long-term Debt [Abstract]
Revolving lines of credit, capacity	205.0
Outstanding borrowings	$ 196.0
2.9% Senior Notes, due 2018
Debt Instrument [Line Items]
Annual interest rate on loan	2.90%	2.90%
Senior Notes
Debt Instrument [Line Items]
Annual interest rate on loan						1.875%
Senior Notes \| 5.5% Senior Notes, due 2022
Debt Instrument [Line Items]
Annual interest rate on loan	5.50%	5.50%									5.50%
Long-term debt	$ 361.0	$ 361.0
Senior Notes \| 2.9% Senior Notes, due 2018
Debt Instrument [Line Items]
Annual interest rate on loan	2.90%	2.90%								2.90%
Long-term debt	$ 337.0	$ 825.0
Senior Notes \| 5.7% Senior Notes, due 2043
Debt Instrument [Line Items]
Annual interest rate on loan	5.70%	5.70%						5.70%
Long-term debt	$ 395.0	$ 394.0
Senior Notes \| 3.65% Senior Notes, due 2026
Debt Instrument [Line Items]
Annual interest rate on loan	3.65%	3.65%			3.65%
Long-term debt	$ 495.0	$ 494.0
Senior Notes \| 4.8% Senior Notes, due 2046
Debt Instrument [Line Items]
Annual interest rate on loan	4.80%	4.80%			4.80%
Long-term debt	$ 296.0	$ 296.0
Senior Notes \| 3.125% Senior Notes, due 2024
Debt Instrument [Line Items]
Annual interest rate on loan	3.125%	0.00%		3.125%
Long-term debt	$ 396.0	$ 0.0
Junior Subordinated Notes (2053 Notes) \| 5.65% Fixed-to-Floating Rate Junior Subordinated Notes, due 2053
Debt Instrument [Line Items]
Annual interest rate on loan	5.65%	5.65%							5.65%
Long-term debt	$ 738.0	$ 738.0
Parent Issuer
Debt Instrument [Line Items]
Intercompany financing - Subsidiaries	418.0	11.0
Current portion of long-term debt	337.0	0.0
Total	755.0	11.0
Long-term debt	3,018.0	3,108.0
Total	2,681.0	3,108.0
Maturities of Long-term Debt [Abstract]
2018	337.0
2019	0.0
2020	0.0
2021	0.0
2022	363.0
Thereafter	2,350.0
Total	3,050.0
Revolving lines of credit, capacity	6,600.0
Outstanding borrowings	3,000.0
Payments of financing costs	39.0	38.0	$ 61.0
Parent Issuer \| Unsecured and Committed
Maturities of Long-term Debt [Abstract]
Revolving lines of credit, capacity	5,900.0
Parent Issuer \| Senior Notes \| 5.5% Senior Notes, due 2022
Debt Instrument [Line Items]
Long-term debt	361.0	361.0
Parent Issuer \| Senior Notes \| 2.9% Senior Notes, due 2018
Debt Instrument [Line Items]
Long-term debt	337.0	825.0
Parent Issuer \| Senior Notes \| 5.7% Senior Notes, due 2043
Debt Instrument [Line Items]
Long-term debt	395.0	394.0
Parent Issuer \| Senior Notes \| 3.65% Senior Notes, due 2026
Debt Instrument [Line Items]
Long-term debt	495.0	494.0
Parent Issuer \| Senior Notes \| 4.8% Senior Notes, due 2046
Debt Instrument [Line Items]
Long-term debt	296.0	296.0
Parent Issuer \| Senior Notes \| 3.125% Senior Notes, due 2024
Debt Instrument [Line Items]
Long-term debt	396.0	0.0
Parent Issuer \| Junior Subordinated Notes (2053 Notes) \| 5.65% Fixed-to-Floating Rate Junior Subordinated Notes, due 2053
Debt Instrument [Line Items]
Long-term debt	$ 738.0	$ 738.0
Financial Guarantee \| Voya Financial, Inc. / Roaring River IV, LLC \| Parent Issuer \| Notes Payable
Maturities of Long-term Debt [Abstract]
Other Commitment							$ 565.0