Condensed Consolidating Financial Information - Balance Sheets (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018
Investments:
Fixed maturities, available-for-sale, at fair value	$ 37,584.0	$ 39,663.0
Fixed maturities, at fair value using the fair value option	2,855.0	2,707.0
Equity securities, at fair value	176.0	196.0
Short-term investments	80.0	68.0
Mortgage loans on real estate, net of valuation allowance	6,969.0	6,878.0
Less: Allowance for credit losses	22.0	0.0
Mortgage loans on real estate, net	6,947.0	6,878.0
Policy loans	763.0	776.0
Limited partnerships/corporations	1,343.0	1,290.0
Derivatives	875.0	316.0
Investments in subsidiaries	0.0	0.0
Other investments	392.0	385.0
Total investments	52,570.0	53,687.0
Cash and cash equivalents	1,033.0	1,181.0	$ 806.0
Short-term investments under securities loan agreements, including collateral delivered	2,183.0	1,395.0
Accrued investment income	541.0	505.0
Premium receivable and reinsurance recoverable	3,744.0	3,732.0
Less: Allowance for credit losses on reinsurance recoverable	22.0	0.0
Premium receivable and reinsurance recoverable	3,722.0	3,732.0
Deferred policy acquisition costs and Value of business acquired	2,603.0	2,226.0	2,610.0	$ 2,973.0
Deferred income taxes	1,769.0	1,458.0
Loans to subsidiaries and affiliates	0.0	0.0
Due from subsidiaries and affiliates	0.0	0.0
Other assets	1,086.0	902.0
Assets related to consolidated investment entities:
Assets held in separate accounts	68,937.0	81,670.0
Assets held for sale	19,133.0	20,069.0
Total assets	155,732.0	169,051.0
Liabilities and Shareholders' Equity:
Future policy benefits	9,640.0	9,945.0
Contract owner account balances	41,981.0	40,923.0
Payables under securities loan and repurchase agreements, including collateral held	2,065.0	1,373.0
Short-term debt	1.0	1.0
Long-term debt	3,042.0	3,042.0
Derivatives	1,068.0	403.0
Pension and other postretirement provisions	442.0	468.0
Current income taxes	30.0	27.0
Due to subsidiaries and affiliates	0.0	0.0
Other liabilities	1,249.0	1,345.0
Liabilities related to consolidated investment entities:
Collateralized loan obligations notes, at fair value using the fair value option	368.0	474.0
Other liabilities	672.0	652.0
Liabilities related to separate accounts	68,937.0	81,670.0
Liabilities held for sale	17,972.0	18,498.0
Total liabilities	147,467.0	158,821.0
Shareholders' equity:
Total Voya Financial, Inc. shareholders' equity	7,427.0	9,408.0
Noncontrolling interest	838.0	822.0
Total shareholders' equity	8,265.0	10,230.0	9,806.0	$ 8,941.0
Total liabilities and shareholders' equity	155,732.0	169,051.0
Consolidating Adjustments
Investments:
Fixed maturities, available-for-sale, at fair value	(15.0)	(15.0)
Fixed maturities, at fair value using the fair value option	0.0	0.0
Equity securities, at fair value	0.0	0.0
Short-term investments	0.0	0.0
Mortgage loans on real estate, net of valuation allowance	0.0	0.0
Less: Allowance for credit losses	0.0	0.0
Mortgage loans on real estate, net	0.0	0.0
Policy loans	0.0	0.0
Limited partnerships/corporations	0.0	0.0
Derivatives	0.0	0.0
Investments in subsidiaries	(16,790.0)	(19,496.0)
Other investments	0.0	0.0
Total investments	(16,805.0)	(19,511.0)
Cash and cash equivalents	0.0	0.0	0.0
Short-term investments under securities loan agreements, including collateral delivered	0.0	0.0
Accrued investment income	0.0	0.0
Premium receivable and reinsurance recoverable	0.0	0.0
Less: Allowance for credit losses on reinsurance recoverable	0.0	0.0
Premium receivable and reinsurance recoverable	0.0	0.0
Deferred policy acquisition costs and Value of business acquired	0.0	0.0
Deferred income taxes	0.0	0.0
Loans to subsidiaries and affiliates	(871.0)	(233.0)
Due from subsidiaries and affiliates	(22.0)	(8.0)
Other assets	0.0	0.0
Assets related to consolidated investment entities:
Assets held in separate accounts	0.0	0.0
Assets held for sale	0.0	0.0
Total assets	(17,698.0)	(19,752.0)
Liabilities and Shareholders' Equity:
Future policy benefits	0.0	0.0
Contract owner account balances	0.0	0.0
Payables under securities loan and repurchase agreements, including collateral held	0.0	0.0
Short-term debt	(871.0)	(233.0)
Long-term debt	(15.0)	(15.0)
Derivatives	0.0	0.0
Pension and other postretirement provisions	0.0	0.0
Current income taxes	0.0	0.0
Due to subsidiaries and affiliates	(19.0)	(6.0)
Other liabilities	(3.0)	(2.0)
Liabilities related to consolidated investment entities:
Collateralized loan obligations notes, at fair value using the fair value option	0.0	0.0
Other liabilities	0.0	0.0
Liabilities related to separate accounts	0.0	0.0
Liabilities held for sale	0.0	0.0
Total liabilities	(908.0)	(256.0)
Shareholders' equity:
Total Voya Financial, Inc. shareholders' equity	(16,790.0)	(19,496.0)
Noncontrolling interest	0.0	0.0
Total shareholders' equity	(16,790.0)	(19,496.0)
Total liabilities and shareholders' equity	(17,698.0)	(19,752.0)
Parent Issuer
Investments:
Fixed maturities, available-for-sale, at fair value	5.0	5.0
Fixed maturities, at fair value using the fair value option	0.0	0.0
Equity securities, at fair value	0.0	0.0
Short-term investments	0.0	0.0
Mortgage loans on real estate, net of valuation allowance	0.0	0.0
Less: Allowance for credit losses	0.0	0.0
Mortgage loans on real estate, net	0.0	0.0
Policy loans	0.0	0.0
Limited partnerships/corporations	4.0	4.0
Derivatives	50.0	49.0
Investments in subsidiaries	9,479.0	11,003.0
Other investments	0.0	0.0
Total investments	9,538.0	11,061.0
Cash and cash equivalents	221.0	212.0	212.0
Short-term investments under securities loan agreements, including collateral delivered	11.0	11.0
Accrued investment income	0.0	0.0
Premium receivable and reinsurance recoverable	0.0	0.0
Less: Allowance for credit losses on reinsurance recoverable	0.0	0.0
Premium receivable and reinsurance recoverable	0.0	0.0
Deferred policy acquisition costs and Value of business acquired	0.0	0.0
Deferred income taxes	828.0	816.0
Loans to subsidiaries and affiliates	245.0	164.0
Due from subsidiaries and affiliates	5.0	2.0
Other assets	24.0	7.0
Assets related to consolidated investment entities:
Assets held in separate accounts	0.0	0.0
Assets held for sale	0.0	0.0
Total assets	10,872.0	12,273.0
Liabilities and Shareholders' Equity:
Future policy benefits	0.0	0.0
Contract owner account balances	0.0	0.0
Payables under securities loan and repurchase agreements, including collateral held	(28.0)	0.0
Short-term debt	626.0	69.0
Long-term debt	2,669.0	2,669.0
Derivatives	77.0	50.0
Pension and other postretirement provisions	0.0	0.0
Current income taxes	28.0	28.0
Due to subsidiaries and affiliates	15.0	4.0
Other liabilities	58.0	45.0
Liabilities related to consolidated investment entities:
Collateralized loan obligations notes, at fair value using the fair value option	0.0	0.0
Other liabilities	0.0	0.0
Liabilities related to separate accounts	0.0	0.0
Liabilities held for sale	0.0	0.0
Total liabilities	3,445.0	2,865.0
Shareholders' equity:
Total Voya Financial, Inc. shareholders' equity	7,427.0	9,408.0
Noncontrolling interest	0.0	0.0
Total shareholders' equity	7,427.0	9,408.0
Total liabilities and shareholders' equity	10,872.0	12,273.0
Subsidiary Guarantor
Investments:
Fixed maturities, available-for-sale, at fair value	0.0	0.0
Fixed maturities, at fair value using the fair value option	0.0	0.0
Equity securities, at fair value	0.0	0.0
Short-term investments	0.0	0.0
Mortgage loans on real estate, net of valuation allowance	0.0	0.0
Less: Allowance for credit losses	0.0	0.0
Mortgage loans on real estate, net	0.0	0.0
Policy loans	0.0	0.0
Limited partnerships/corporations	0.0	0.0
Derivatives	0.0	0.0
Investments in subsidiaries	7,311.0	8,493.0
Other investments	0.0	0.0
Total investments	7,311.0	8,493.0
Cash and cash equivalents	0.0	0.0	0.0
Short-term investments under securities loan agreements, including collateral delivered	0.0	0.0
Accrued investment income	0.0	0.0
Premium receivable and reinsurance recoverable	0.0	0.0
Less: Allowance for credit losses on reinsurance recoverable	0.0	0.0
Premium receivable and reinsurance recoverable	0.0	0.0
Deferred policy acquisition costs and Value of business acquired	0.0	0.0
Deferred income taxes	42.0	39.0
Loans to subsidiaries and affiliates	0.0	0.0
Due from subsidiaries and affiliates	0.0	0.0
Other assets	0.0	0.0
Assets related to consolidated investment entities:
Assets held in separate accounts	0.0	0.0
Assets held for sale	0.0	0.0
Total assets	7,353.0	8,532.0
Liabilities and Shareholders' Equity:
Future policy benefits	0.0	0.0
Contract owner account balances	0.0	0.0
Payables under securities loan and repurchase agreements, including collateral held	0.0	0.0
Short-term debt	67.0	87.0
Long-term debt	371.0	371.0
Derivatives	0.0	0.0
Pension and other postretirement provisions	0.0	0.0
Current income taxes	(18.0)	(17.0)
Due to subsidiaries and affiliates	0.0	0.0
Other liabilities	4.0	10.0
Liabilities related to consolidated investment entities:
Collateralized loan obligations notes, at fair value using the fair value option	0.0	0.0
Other liabilities	0.0	0.0
Liabilities related to separate accounts	0.0	0.0
Liabilities held for sale	0.0	0.0
Total liabilities	424.0	451.0
Shareholders' equity:
Total Voya Financial, Inc. shareholders' equity	6,929.0	8,081.0
Noncontrolling interest	0.0	0.0
Total shareholders' equity	6,929.0	8,081.0
Total liabilities and shareholders' equity	7,353.0	8,532.0
Non-Guarantor Subsidiaries
Investments:
Fixed maturities, available-for-sale, at fair value	37,594.0	39,673.0
Fixed maturities, at fair value using the fair value option	2,855.0	2,707.0
Equity securities, at fair value	176.0	196.0
Short-term investments	80.0	68.0
Mortgage loans on real estate, net of valuation allowance	6,969.0	6,878.0
Less: Allowance for credit losses	22.0	0.0
Mortgage loans on real estate, net	6,947.0	6,878.0
Policy loans	763.0	776.0
Limited partnerships/corporations	1,339.0	1,286.0
Derivatives	825.0	267.0
Investments in subsidiaries	0.0	0.0
Other investments	392.0	385.0
Total investments	52,526.0	53,644.0
Cash and cash equivalents	812.0	969.0	$ 594.0
Short-term investments under securities loan agreements, including collateral delivered	2,172.0	1,384.0
Accrued investment income	541.0	505.0
Premium receivable and reinsurance recoverable	3,744.0	3,732.0
Less: Allowance for credit losses on reinsurance recoverable	22.0	0.0
Premium receivable and reinsurance recoverable	3,722.0	3,732.0
Deferred policy acquisition costs and Value of business acquired	2,603.0	2,226.0
Deferred income taxes	899.0	603.0
Loans to subsidiaries and affiliates	626.0	69.0
Due from subsidiaries and affiliates	17.0	6.0
Other assets	1,062.0	895.0
Assets related to consolidated investment entities:
Assets held in separate accounts	68,937.0	81,670.0
Assets held for sale	19,133.0	20,069.0
Total assets	155,205.0	167,998.0
Liabilities and Shareholders' Equity:
Future policy benefits	9,640.0	9,945.0
Contract owner account balances	41,981.0	40,923.0
Payables under securities loan and repurchase agreements, including collateral held	2,093.0	1,373.0
Short-term debt	179.0	78.0
Long-term debt	17.0	17.0
Derivatives	991.0	353.0
Pension and other postretirement provisions	442.0	468.0
Current income taxes	20.0	16.0
Due to subsidiaries and affiliates	4.0	2.0
Other liabilities	1,190.0	1,292.0
Liabilities related to consolidated investment entities:
Collateralized loan obligations notes, at fair value using the fair value option	368.0	474.0
Other liabilities	672.0	652.0
Liabilities related to separate accounts	68,937.0	81,670.0
Liabilities held for sale	17,972.0	18,498.0
Total liabilities	144,506.0	155,761.0
Shareholders' equity:
Total Voya Financial, Inc. shareholders' equity	9,861.0	11,415.0
Noncontrolling interest	838.0	822.0
Total shareholders' equity	10,699.0	12,237.0
Total liabilities and shareholders' equity	155,205.0	167,998.0
Limited partnerships/corporations, at fair value
Assets related to consolidated investment entities:
Assets related to consolidated investment entities	1,655.0	1,632.0
Limited partnerships/corporations, at fair value | Consolidating Adjustments
Assets related to consolidated investment entities:
Assets related to consolidated investment entities	0.0	0.0
Limited partnerships/corporations, at fair value | Parent Issuer
Assets related to consolidated investment entities:
Assets related to consolidated investment entities	0.0	0.0
Limited partnerships/corporations, at fair value | Subsidiary Guarantor
Assets related to consolidated investment entities:
Assets related to consolidated investment entities	0.0	0.0
Limited partnerships/corporations, at fair value | Non-Guarantor Subsidiaries
Assets related to consolidated investment entities:
Assets related to consolidated investment entities	1,655.0	1,632.0
Cash and cash equivalents
Assets related to consolidated investment entities:
Assets related to consolidated investment entities	52.0	68.0
Cash and cash equivalents | Consolidating Adjustments
Assets related to consolidated investment entities:
Assets related to consolidated investment entities	0.0	0.0
Cash and cash equivalents | Parent Issuer
Assets related to consolidated investment entities:
Assets related to consolidated investment entities	0.0	0.0
Cash and cash equivalents | Subsidiary Guarantor
Assets related to consolidated investment entities:
Assets related to consolidated investment entities	0.0	0.0
Cash and cash equivalents | Non-Guarantor Subsidiaries
Assets related to consolidated investment entities:
Assets related to consolidated investment entities	52.0	68.0
Corporate loans, at fair value using the fair value option
Assets related to consolidated investment entities:
Assets related to consolidated investment entities	432.0	513.0
Corporate loans, at fair value using the fair value option | Consolidating Adjustments
Assets related to consolidated investment entities:
Assets related to consolidated investment entities	0.0	0.0
Corporate loans, at fair value using the fair value option | Parent Issuer
Assets related to consolidated investment entities:
Assets related to consolidated investment entities	0.0	0.0
Corporate loans, at fair value using the fair value option | Subsidiary Guarantor
Assets related to consolidated investment entities:
Assets related to consolidated investment entities	0.0	0.0
Corporate loans, at fair value using the fair value option | Non-Guarantor Subsidiaries
Assets related to consolidated investment entities:
Assets related to consolidated investment entities	432.0	513.0
Other assets
Assets related to consolidated investment entities:
Assets related to consolidated investment entities	16.0	13.0
Other assets | Consolidating Adjustments
Assets related to consolidated investment entities:
Assets related to consolidated investment entities	0.0	0.0
Other assets | Parent Issuer
Assets related to consolidated investment entities:
Assets related to consolidated investment entities	0.0	0.0
Other assets | Subsidiary Guarantor
Assets related to consolidated investment entities:
Assets related to consolidated investment entities	0.0	0.0
Other assets | Non-Guarantor Subsidiaries
Assets related to consolidated investment entities:
Assets related to consolidated investment entities	16.0	13.0
Collateral Pledged
Investments:
Securities pledged	1,555.0	1,408.0
Collateral Pledged | Consolidating Adjustments
Investments:
Securities pledged	0.0	0.0
Collateral Pledged | Parent Issuer
Investments:
Securities pledged	0.0	0.0
Collateral Pledged | Subsidiary Guarantor
Investments:
Securities pledged	0.0	0.0
Collateral Pledged | Non-Guarantor Subsidiaries
Investments:
Securities pledged	$ 1,555.0	$ 1,408.0