Condensed Consolidating Financial Information - Statements of Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Condensed Financial Statements, Captions [Line Items]
Net income (loss)	$ (146)	$ 252	$ (224)	$ 325
Other comprehensive income (loss), before tax:
Unrealized gains (losses) on securities	2,782	1,141	898	2,425
Impairments	0	1	0	2
Pension and other postretirement benefits liability	(1)	(1)	(2)	(2)
Other comprehensive income (loss), before tax	2,781	1,141	896	2,425
Income tax expense (benefit) related to items of other comprehensive income (loss)	583	240	188	508
Other comprehensive income (loss), after tax	2,198	901	708	1,917
Comprehensive income (loss)	2,052	1,153	484	2,242
Less: Comprehensive income (loss) attributable to noncontrolling interest	(79)	26	(73)	25
Comprehensive income (loss) attributable to Voya Financial, Inc.	2,131	1,127	557	2,217
Consolidating Adjustments
Condensed Financial Statements, Captions [Line Items]
Net income (loss)	87	(403)	(13)	(565)
Other comprehensive income (loss), before tax:
Unrealized gains (losses) on securities	(4,953)	(2,016)	(1,531)	(4,336)
Impairments	0	(2)	0	(4)
Pension and other postretirement benefits liability	2	2	3	3
Other comprehensive income (loss), before tax	(4,951)	(2,016)	(1,528)	(4,337)
Income tax expense (benefit) related to items of other comprehensive income (loss)	(1,040)	(423)	(321)	(907)
Other comprehensive income (loss), after tax	(3,911)	(1,593)	(1,207)	(3,430)
Comprehensive income (loss)	(3,824)	(1,996)	(1,220)	(3,995)
Less: Comprehensive income (loss) attributable to noncontrolling interest	0	0	0	0
Comprehensive income (loss) attributable to Voya Financial, Inc.	(3,824)	(1,996)	(1,220)	(3,995)
Parent Issuer
Condensed Financial Statements, Captions [Line Items]
Net income (loss)	(67)	226	(151)	300
Other comprehensive income (loss), before tax:
Unrealized gains (losses) on securities	2,782	1,141	898	2,425
Impairments	0	1	0	2
Pension and other postretirement benefits liability	(1)	(1)	(2)	(2)
Other comprehensive income (loss), before tax	2,781	1,141	896	2,425
Income tax expense (benefit) related to items of other comprehensive income (loss)	583	240	188	508
Other comprehensive income (loss), after tax	2,198	901	708	1,917
Comprehensive income (loss)	2,131	1,127	557	2,217
Less: Comprehensive income (loss) attributable to noncontrolling interest	0	0	0	0
Comprehensive income (loss) attributable to Voya Financial, Inc.	2,131	1,127	557	2,217
Subsidiary Guarantor
Condensed Financial Statements, Captions [Line Items]
Net income (loss)	(33)	143	99	127
Other comprehensive income (loss), before tax:
Unrealized gains (losses) on securities	2,171	874	634	1,910
Impairments	0	1	0	2
Pension and other postretirement benefits liability	(1)	(1)	(1)	(1)
Other comprehensive income (loss), before tax	2,170	874	633	1,911
Income tax expense (benefit) related to items of other comprehensive income (loss)	456	183	133	399
Other comprehensive income (loss), after tax	1,714	691	500	1,512
Comprehensive income (loss)	1,681	834	599	1,639
Less: Comprehensive income (loss) attributable to noncontrolling interest	0	0	0	0
Comprehensive income (loss) attributable to Voya Financial, Inc.	1,681	834	599	1,639
Non-Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Net income (loss)	(133)	286	(159)	463
Other comprehensive income (loss), before tax:
Unrealized gains (losses) on securities	2,782	1,142	897	2,426
Impairments	0	1	0	2
Pension and other postretirement benefits liability	(1)	(1)	(2)	(2)
Other comprehensive income (loss), before tax	2,781	1,142	895	2,426
Income tax expense (benefit) related to items of other comprehensive income (loss)	584	240	188	508
Other comprehensive income (loss), after tax	2,197	902	707	1,918
Comprehensive income (loss)	2,064	1,188	548	2,381
Less: Comprehensive income (loss) attributable to noncontrolling interest	(79)	26	(73)	25
Comprehensive income (loss) attributable to Voya Financial, Inc.	$ 2,143	$ 1,162	$ 621	$ 2,356