Schedule II - Condensed Financial Information of Parent - Guarantees (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Guarantor Obligations [Line Items]
Outstanding borrowings	$ 3,857
Revolving lines of credit, capacity	5,036
Long-term debt	3,043	$ 3,137
Notes Payable \| 8.42% Equitable of Iowa Companies Capital Trust II Notes, due 2027
Guarantor Obligations [Line Items]
Long-term debt	$ 14	$ 14
Annual interest rate on loan	8.42%	8.42%
Debentures \| Voya Holdings Debentures
Guarantor Obligations [Line Items]
Long-term debt	$ 358	$ 358
Parent Issuer
Guarantor Obligations [Line Items]
Outstanding borrowings	3,800
Revolving lines of credit, capacity	5,000
Financial Guarantee \| Parent Issuer \| Voya Financial, Inc. / Roaring River IV, LLC \| Notes Payable
Guarantor Obligations [Line Items]
Maintenance and reimbursement agreements	565
Financial Guarantee \| Parent Issuer \| Hannover Re / Voya Financial, Inc. / Security Life of Denver International Limited \| Notes Payable
Guarantor Obligations [Line Items]
Maintenance and reimbursement agreements	2,900
Outstanding borrowings	600
Financial Guarantee \| Parent Issuer \| Voya Financial, Inc. / Security Life of Denver Insurance Company \| Notes Payable
Guarantor Obligations [Line Items]
Maintenance and reimbursement agreements	13
Financial Guarantee \| Parent Issuer \| Voya Holdings Inc. \| Notes Payable \| 8.42% Equitable of Iowa Companies Capital Trust II Notes, due 2027
Guarantor Obligations [Line Items]
Long-term debt	$ 13

Contractual interest rate for funds borrowed, under the debt agreement.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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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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Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions.

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