Schedule II - Condensed Financial Information of Parent - Loans to Subsidiaries (Details) - Parent Issuer - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income, operating	$ 6	$ 5	$ 8
Loans to subsidiaries	164	79
Voya Alternative Asset Management LLC | Subsidiary Loan, Due December 30, 2019, 0.02 Percent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans to subsidiaries	$ 0	$ 2
Rate	0.02%	0.02%
Voya Custom Investments | Subsidiary Loan, Due January 30, 2020, 2.80 Percent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans to subsidiaries	$ 1	$ 0
Rate	2.80%	2.80%
Voya Capital | Subsidiary Loan, Due January 7 2020, 2.60 Percent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans to subsidiaries	$ 9	$ 4
Rate	2.60%	2.60%
Voya Investment Management, LLC | Subsidiary Loan, Due January 24, 2020, 2.80 Percent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans to subsidiaries	$ 53	$ 51
Rate	2.80%	2.80%
Voya Payroll Management, Inc. | Subsidiary Loan, Due January 2, 2020, 2.53 Percent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans to subsidiaries	$ 7	$ 6
Rate	2.53%	2.53%
Voya Holdings Inc. | Subsidiary Loan, Due January 10, 2020, 2.68 Percent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans to subsidiaries	$ 30	$ 0
Rate	2.68%	2.68%
Voya Holdings Inc. | Subsidiary Loan, Due January 30, 2020, 2.78 Percent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans to subsidiaries	$ 57	$ 0
Rate	2.78%	2.78%
Security Life of Denver International Ltd | Subsidiary Loan, Due January 2, 2020, 2.53 Percent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans to subsidiaries	$ 0	$ 16
Rate	2.53%	2.53%
Voya Services Company | Subsidiary Loan, Due January 2, 2020, 2.53 Percent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans to subsidiaries	$ 7	$ 0
Rate	2.53%	2.53%