Related Party Transactions - Operating Agreements and Investment Advisory and Other Fees (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Related Party Transaction [Line Items]
Earning related to agreements	$ 695	$ 713	$ 725
Short-term loan to affiliate	0	80
Voya Investment Management LLC
Related Party Transaction [Line Items]
Expenses incurred	65	64	58
Earning related to agreements	63	55	33
Voya Services Company
Related Party Transaction [Line Items]
Asset management, administrative and accounting services fees	287	263	265
US Insurance Company and Affiliates
Related Party Transaction [Line Items]
Expenses incurred	15	43	45
Voya Financial Advisors, Inc
Related Party Transaction [Line Items]
Commission expenses incurred	79	77	73
Voya Insurance and Annuity Company (VIAC) and ReliaStar Life Insurance Company of New York (RLNY), and Affiliated Companies \| DSL
Related Party Transaction [Line Items]
Commissions collected	69	170	175
VIAC, VIPS, ReliaStar Life Insurance Company and Security Life of Denver Insurance Company \| DSL
Related Party Transaction [Line Items]
Expenses incurred	26	83	123
Voya Investments, LLC and Voya Investment Management, LLC, and Affiliated Companies \| DSL
Related Party Transaction [Line Items]
Asset management, administrative and accounting services fees	0	23	70
Affiliated entity \| Voya Financial Partners, LLC (VFP)
Related Party Transaction [Line Items]
Distribution revenues	27	27	25
Affiliated entity \| DSL
Related Party Transaction [Line Items]
Earning related to agreements	$ 27	$ 179	$ 350

For an unclassified balance sheet, amounts due from related parties including affiliates, employees, joint ventures, officers and stockholders, immediate families thereof, and pension funds.

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