Consolidated Investment Entities - Consolidation of Investment Entities into the Consolidated Statements of Operations (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenues:
Net investment income									$ 2,792.0	$ 2,669.0	$ 2,641.0
Fee income									1,969.0	1,982.0	1,889.0
Premiums									2,273.0	2,132.0	2,097.0
Total net realized capital gains (losses)									(166.0)	(355.0)	(209.0)
Other revenue									465.0	443.0	379.0
Income related to consolidated investment entities									143.0	292.0	432.0
Total revenues	$ 1,810.0	$ 1,875.0	$ 1,969.0	$ 1,822.0	$ 1,851.0	$ 1,890.0	$ 1,761.0	$ 1,661.0	7,476.0	7,163.0	7,229.0
Benefits and expenses:
Policyholder benefits and Interest credited and other benefits to contract owners									3,750.0	3,526.0	3,658.0
Other expense									3,121.0	3,060.0	3,099.0
Operating expenses related to consolidated investment entities									45.0	49.0	87.0
Total benefits and expenses	1,744.0	1,726.0	1,726.0	1,720.0	1,725.0	1,661.0	1,596.0	1,653.0	6,916.0	6,635.0	6,844.0
Income (loss) from continuing operations before income taxes	66.0	149.0	243.0	102.0	126.0	229.0	165.0	8.0	560.0	528.0	385.0
Income tax expense (benefit)									(205.0)	37.0	687.0
Income (Loss) from continuing operations									765.0	491.0	(302.0)
Income (loss) from discontinued operations, net of tax	(1,084.0)	(4.0)	42.0	(20.0)	29.0	(32.0)	92.0	440.0	(1,066.0)	529.0	(2,473.0)
Net income (loss)	(766.0)	140.0	252.0	73.0	177.0	168.0	229.0	446.0	(301.0)	1,020.0	(2,775.0)
Less: Net income (loss) attributable to noncontrolling interest	6.0	19.0	26.0	(1.0)	57.0	26.0	62.0	0.0	50.0	145.0	217.0
Net income (loss) available to Voya Financial, Inc.	(772.0)	121.0	226.0	74.0	120.0	142.0	167.0	446.0	(351.0)	875.0	(2,992.0)
Less: Preferred stock dividends	4.0	14.0	0.0	10.0	0.0	0.0	0.0	0.0	28.0	0.0	0.0
Net income (loss) available to Voya Financial, Inc.'s common shareholders	$ (776.0)	$ 107.0	$ 226.0	$ 64.0	$ 120.0	$ 142.0	$ 167.0	$ 446.0	(379.0)	875.0	(2,992.0)
Before Consolidation
Revenues:
Net investment income									2,801.0	2,716.0	2,721.0
Fee income									2,008.0	2,033.0	1,937.0
Premiums									2,273.0	2,132.0	2,097.0
Total net realized capital gains (losses)									(166.0)	(355.0)	(209.0)
Other revenue									465.0	443.0	379.0
Income related to consolidated investment entities									(1.0)	0.0	0.0
Total revenues									7,380.0	6,969.0	6,925.0
Benefits and expenses:
Policyholder benefits and Interest credited and other benefits to contract owners									3,750.0	3,526.0	3,658.0
Other expense									3,121.0	3,060.0	3,099.0
Operating expenses related to consolidated investment entities									(1.0)	0.0	0.0
Total benefits and expenses									6,870.0	6,586.0	6,757.0
Income (loss) from continuing operations before income taxes									510.0	383.0	168.0
Income tax expense (benefit)									(205.0)	37.0	687.0
Income (Loss) from continuing operations									715.0	346.0	(519.0)
Income (loss) from discontinued operations, net of tax									(1,066.0)	529.0	(2,473.0)
Net income (loss)									(351.0)	875.0	(2,992.0)
Less: Net income (loss) attributable to noncontrolling interest									0.0	0.0	0.0
Net income (loss) available to Voya Financial, Inc.									(351.0)	875.0	(2,992.0)
Less: Preferred stock dividends									28.0	0.0	0.0
Net income (loss) available to Voya Financial, Inc.'s common shareholders									(379.0)	875.0	(2,992.0)
CLOs
Revenues:
Net investment income									0.0	0.0	0.0
Fee income									0.0	0.0	0.0
Premiums									0.0	0.0	0.0
Total net realized capital gains (losses)									0.0	0.0	0.0
Other revenue									0.0	0.0	0.0
Income related to consolidated investment entities									23.0	28.0	82.0
Total revenues									23.0	28.0	82.0
Benefits and expenses:
Policyholder benefits and Interest credited and other benefits to contract owners									0.0	0.0	0.0
Other expense									0.0	0.0	0.0
Operating expenses related to consolidated investment entities									23.0	28.0	82.0
Total benefits and expenses									23.0	28.0	82.0
Income (loss) from continuing operations before income taxes									0.0	0.0	0.0
Income tax expense (benefit)									0.0	0.0	0.0
Income (Loss) from continuing operations									0.0	0.0	0.0
Income (loss) from discontinued operations, net of tax									0.0	0.0	0.0
Net income (loss)									0.0	0.0	0.0
Less: Net income (loss) attributable to noncontrolling interest									0.0	0.0	0.0
Net income (loss) available to Voya Financial, Inc.									0.0	0.0	0.0
Less: Preferred stock dividends									0.0	0.0	0.0
Net income (loss) available to Voya Financial, Inc.'s common shareholders									0.0	0.0	0.0
LPs and VOEs
Revenues:
Net investment income									0.0	0.0	0.0
Fee income									0.0	0.0	0.0
Premiums									0.0	0.0	0.0
Total net realized capital gains (losses)									0.0	0.0	0.0
Other revenue									0.0	0.0	0.0
Income related to consolidated investment entities									121.0	264.0	350.0
Total revenues									121.0	264.0	350.0
Benefits and expenses:
Policyholder benefits and Interest credited and other benefits to contract owners									0.0	0.0	0.0
Other expense									0.0	0.0	0.0
Operating expenses related to consolidated investment entities									64.0	73.0	55.0
Total benefits and expenses									64.0	73.0	55.0
Income (loss) from continuing operations before income taxes									57.0	191.0	295.0
Income tax expense (benefit)									0.0	0.0	0.0
Income (Loss) from continuing operations									57.0	191.0	295.0
Income (loss) from discontinued operations, net of tax									0.0	0.0	0.0
Net income (loss)									57.0	191.0	295.0
Less: Net income (loss) attributable to noncontrolling interest									0.0	0.0	0.0
Net income (loss) available to Voya Financial, Inc.									57.0	191.0	295.0
Less: Preferred stock dividends									0.0	0.0	0.0
Net income (loss) available to Voya Financial, Inc.'s common shareholders									57.0	191.0	295.0
CLOs Adjustments
Revenues:
Net investment income									(1.0)	(1.0)	(2.0)
Fee income									(2.0)	(3.0)	(9.0)
Premiums									0.0	0.0	0.0
Total net realized capital gains (losses)									0.0	0.0	0.0
Other revenue									0.0	0.0	0.0
Income related to consolidated investment entities									0.0	0.0	0.0
Total revenues									(3.0)	(4.0)	(11.0)
Benefits and expenses:
Policyholder benefits and Interest credited and other benefits to contract owners									0.0	0.0	0.0
Other expense									0.0	0.0	0.0
Operating expenses related to consolidated investment entities									(3.0)	(4.0)	(11.0)
Total benefits and expenses									(3.0)	(4.0)	(11.0)
Income (loss) from continuing operations before income taxes									0.0	0.0	0.0
Income tax expense (benefit)									0.0	0.0	0.0
Income (Loss) from continuing operations									0.0	0.0	0.0
Income (loss) from discontinued operations, net of tax									0.0	0.0	0.0
Net income (loss)									0.0	0.0	0.0
Less: Net income (loss) attributable to noncontrolling interest									0.0	0.0	0.0
Net income (loss) available to Voya Financial, Inc.									0.0	0.0	0.0
Less: Preferred stock dividends									0.0	0.0	0.0
Net income (loss) available to Voya Financial, Inc.'s common shareholders									0.0	0.0	0.0
LPs and VOEs Adjustments
Revenues:
Net investment income									(8.0)	(46.0)	(78.0)
Fee income									(37.0)	(48.0)	(39.0)
Premiums									0.0	0.0	0.0
Total net realized capital gains (losses)									0.0	0.0	0.0
Other revenue									0.0	0.0	0.0
Income related to consolidated investment entities									0.0	0.0	0.0
Total revenues									(45.0)	(94.0)	(117.0)
Benefits and expenses:
Policyholder benefits and Interest credited and other benefits to contract owners									0.0	0.0	0.0
Other expense									0.0	0.0	0.0
Operating expenses related to consolidated investment entities									(38.0)	(48.0)	(39.0)
Total benefits and expenses									(38.0)	(48.0)	(39.0)
Income (loss) from continuing operations before income taxes									(7.0)	(46.0)	(78.0)
Income tax expense (benefit)									0.0	0.0	0.0
Income (Loss) from continuing operations									(7.0)	(46.0)	(78.0)
Income (loss) from discontinued operations, net of tax									0.0	0.0	0.0
Net income (loss)									(7.0)	(46.0)	(78.0)
Less: Net income (loss) attributable to noncontrolling interest									50.0	145.0	217.0
Net income (loss) available to Voya Financial, Inc.									(57.0)	(191.0)	(295.0)
Less: Preferred stock dividends									0.0	0.0	0.0
Net income (loss) available to Voya Financial, Inc.'s common shareholders									$ (57.0)	$ (191.0)	$ (295.0)