Condensed Consolidating Financial Information - Balance Sheets (Details) - USD ($) $ in Millions	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018
Investments:
Fixed maturities, available-for-sale, at fair value	$ 40,938.0		$ 39,663.0
Fixed maturities, at fair value using the fair value option	3,098.0		2,707.0
Equity securities, at fair value	225.0		196.0
Short-term investments	73.0		68.0
Mortgage loans on real estate, net of valuation allowance	6,904.0		6,878.0
Less: Allowance for credit losses	74.0		0.0
Mortgage loans on real estate, net	6,830.0		6,878.0
Policy loans	746.0		776.0
Limited partnerships/corporations	1,376.0		1,290.0
Derivatives	809.0		316.0
Investments in subsidiaries	0.0		0.0
Other investments	319.0		385.0
Total investments	55,536.0		53,687.0
Cash and cash equivalents	1,110.0		1,181.0	$ 1,178.0
Short-term investments under securities loan agreements, including collateral delivered	1,659.0		1,395.0
Accrued investment income	507.0		505.0
Premium receivable and reinsurance recoverable	3,791.0		3,732.0
Less: Allowance for credit losses on reinsurance recoverable	24.0		0.0
Premium receivable and reinsurance recoverable	3,767.0		3,732.0
Deferred policy acquisition costs and Value of business acquired	1,967.0		2,226.0	2,418.0		$ 2,973.0
Deferred income taxes	1,326.0		1,458.0
Loans to subsidiaries and affiliates	0.0		0.0
Due from subsidiaries and affiliates	0.0		0.0
Other assets	836.0		902.0
Assets related to consolidated investment entities:
Assets held in separate accounts	78,521.0		81,670.0
Assets held for sale	19,923.0		20,069.0
Total assets	166,934.0		169,051.0
Liabilities and Shareholders' Equity:
Future policy benefits	9,984.0		9,945.0
Contract owner account balances	41,674.0		40,923.0
Payables under securities loan and repurchase agreements, including collateral held	1,608.0		1,373.0
Short-term debt	1.0		1.0
Long-term debt	3,043.0		3,042.0
Derivatives	950.0		403.0
Pension and other postretirement provisions	431.0		468.0
Current income taxes	145.0		27.0
Due to subsidiaries and affiliates	0.0		0.0
Other liabilities	1,380.0		1,345.0
Liabilities related to consolidated investment entities:
Collateralized loan obligations notes, at fair value using the fair value option	268.0		474.0
Other liabilities	606.0		652.0
Liabilities related to separate accounts	78,521.0		81,670.0
Liabilities held for sale	18,034.0		18,498.0
Total liabilities	156,645.0		158,821.0
Shareholders' equity:
Total Voya Financial, Inc. shareholders' equity	9,548.0		9,408.0
Noncontrolling interest	741.0		822.0
Total shareholders' equity	10,289.0	$ 8,265.0	10,230.0	10,740.0	$ 9,806.0	$ 8,941.0
Total liabilities and shareholders' equity	166,934.0		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	(20,029.0)		(19,496.0)
Other investments	0.0		0.0
Total investments	(20,044.0)		(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	(500.0)		(233.0)
Due from subsidiaries and affiliates	(7.0)		(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	(20,551.0)		(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	(500.0)		(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	(5.0)		(6.0)
Other liabilities	(2.0)		(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	(522.0)		(256.0)
Shareholders' equity:
Total Voya Financial, Inc. shareholders' equity	(20,029.0)		(19,496.0)
Noncontrolling interest	0.0		0.0
Total shareholders' equity	(20,029.0)		(19,496.0)
Total liabilities and shareholders' equity	(20,551.0)		(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	48.0		49.0
Investments in subsidiaries	11,334.0		11,003.0
Other investments	0.0		0.0
Total investments	11,391.0		11,061.0
Cash and cash equivalents	243.0		212.0	452.0
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	830.0		816.0
Loans to subsidiaries and affiliates	246.0		164.0
Due from subsidiaries and affiliates	4.0		2.0
Other assets	5.0		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	12,730.0		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	23.0		0.0
Short-term debt	254.0		69.0
Long-term debt	2,670.0		2,669.0
Derivatives	48.0		50.0
Pension and other postretirement provisions	0.0		0.0
Current income taxes	144.0		28.0
Due to subsidiaries and affiliates	1.0		4.0
Other liabilities	42.0		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	3,182.0		2,865.0
Shareholders' equity:
Total Voya Financial, Inc. shareholders' equity	9,548.0		9,408.0
Noncontrolling interest	0.0		0.0
Total shareholders' equity	9,548.0		9,408.0
Total liabilities and shareholders' equity	12,730.0		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	8,695.0		8,493.0
Other investments	0.0		0.0
Total investments	8,695.0		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	44.0		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	8,739.0		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	51.0		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	11.0		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	415.0		451.0
Shareholders' equity:
Total Voya Financial, Inc. shareholders' equity	8,324.0		8,081.0
Noncontrolling interest	0.0		0.0
Total shareholders' equity	8,324.0		8,081.0
Total liabilities and shareholders' equity	8,739.0		8,532.0
Non-Guarantor Subsidiaries
Investments:
Fixed maturities, available-for-sale, at fair value	40,948.0		39,673.0
Fixed maturities, at fair value using the fair value option	3,098.0		2,707.0
Equity securities, at fair value	225.0		196.0
Short-term investments	73.0		68.0
Mortgage loans on real estate, net of valuation allowance	6,904.0		6,878.0
Less: Allowance for credit losses	74.0		0.0
Mortgage loans on real estate, net	6,830.0		6,878.0
Policy loans	746.0		776.0
Limited partnerships/corporations	1,372.0		1,286.0
Derivatives	761.0		267.0
Investments in subsidiaries	0.0		0.0
Other investments	319.0		385.0
Total investments	55,494.0		53,644.0
Cash and cash equivalents	867.0		969.0	$ 726.0
Short-term investments under securities loan agreements, including collateral delivered	1,648.0		1,384.0
Accrued investment income	507.0		505.0
Premium receivable and reinsurance recoverable	3,791.0		3,732.0
Less: Allowance for credit losses on reinsurance recoverable	24.0		0.0
Premium receivable and reinsurance recoverable	3,767.0		3,732.0
Deferred policy acquisition costs and Value of business acquired	1,967.0		2,226.0
Deferred income taxes	452.0		603.0
Loans to subsidiaries and affiliates	254.0		69.0
Due from subsidiaries and affiliates	3.0		6.0
Other assets	831.0		895.0
Assets related to consolidated investment entities:
Assets held in separate accounts	78,521.0		81,670.0
Assets held for sale	19,923.0		20,069.0
Total assets	166,016.0		167,998.0
Liabilities and Shareholders' Equity:
Future policy benefits	9,984.0		9,945.0
Contract owner account balances	41,674.0		40,923.0
Payables under securities loan and repurchase agreements, including collateral held	1,585.0		1,373.0
Short-term debt	196.0		78.0
Long-term debt	17.0		17.0
Derivatives	902.0		353.0
Pension and other postretirement provisions	431.0		468.0
Current income taxes	19.0		16.0
Due to subsidiaries and affiliates	4.0		2.0
Other liabilities	1,329.0		1,292.0
Liabilities related to consolidated investment entities:
Collateralized loan obligations notes, at fair value using the fair value option	268.0		474.0
Other liabilities	606.0		652.0
Liabilities related to separate accounts	78,521.0		81,670.0
Liabilities held for sale	18,034.0		18,498.0
Total liabilities	153,570.0		155,761.0
Shareholders' equity:
Total Voya Financial, Inc. shareholders' equity	11,705.0		11,415.0
Noncontrolling interest	741.0		822.0
Total shareholders' equity	12,446.0		12,237.0
Total liabilities and shareholders' equity	166,016.0		167,998.0
Limited partnerships/corporations, at fair value
Assets related to consolidated investment entities:
Assets related to consolidated investment entities	1,459.0		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	1,459.0		1,632.0
Cash and cash equivalents
Assets related to consolidated investment entities:
Assets related to consolidated investment entities	39.0		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	39.0		68.0
Corporate loans, at fair value using the fair value option
Assets related to consolidated investment entities:
Assets related to consolidated investment entities	274.0		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	274.0		513.0
Other assets
Assets related to consolidated investment entities:
Assets related to consolidated investment entities	10.0		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	10.0		13.0
Collateral Pledged
Investments:
Securities pledged	1,122.0		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	$ 1,122.0		$ 1,408.0