Condensed Consolidating Financial Information - Statements of Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Condensed Financial Statements, Captions [Line Items]
Net income (loss)	$ (78)	$ 73
Other comprehensive income (loss), before tax:
Unrealized gains (losses) on securities	(1,884)	1,284
Impairments	0	1
Pension and other postretirement benefits liability	(1)	(1)
Other comprehensive income (loss), before tax	(1,885)	1,284
Income tax expense (benefit) related to items of other comprehensive income (loss)	(395)	268
Other comprehensive income (loss), after tax	(1,490)	1,016
Comprehensive income (loss)	(1,568)	1,089
Less: Comprehensive income (loss) attributable to noncontrolling interest	6	(1)
Comprehensive income (loss) attributable to Voya Financial, Inc.	(1,574)	1,090
Consolidating Adjustments
Condensed Financial Statements, Captions [Line Items]
Net income (loss)	(100)	(162)
Other comprehensive income (loss), before tax:
Unrealized gains (losses) on securities	3,422	(2,320)
Impairments	0	(2)
Pension and other postretirement benefits liability	1	1
Other comprehensive income (loss), before tax	3,423	(2,321)
Income tax expense (benefit) related to items of other comprehensive income (loss)	719	(484)
Other comprehensive income (loss), after tax	2,704	(1,837)
Comprehensive income (loss)	2,604	(1,999)
Less: Comprehensive income (loss) attributable to noncontrolling interest	0	0
Comprehensive income (loss) attributable to Voya Financial, Inc.	2,604	(1,999)
Parent Issuer
Condensed Financial Statements, Captions [Line Items]
Net income (loss)	(84)	74
Other comprehensive income (loss), before tax:
Unrealized gains (losses) on securities	(1,884)	1,284
Impairments	0	1
Pension and other postretirement benefits liability	(1)	(1)
Other comprehensive income (loss), before tax	(1,885)	1,284
Income tax expense (benefit) related to items of other comprehensive income (loss)	(395)	268
Other comprehensive income (loss), after tax	(1,490)	1,016
Comprehensive income (loss)	(1,574)	1,090
Less: Comprehensive income (loss) attributable to noncontrolling interest	0	0
Comprehensive income (loss) attributable to Voya Financial, Inc.	(1,574)	1,090
Subsidiary Guarantor
Condensed Financial Statements, Captions [Line Items]
Net income (loss)	132	(16)
Other comprehensive income (loss), before tax:
Unrealized gains (losses) on securities	(1,537)	1,036
Impairments	0	1
Pension and other postretirement benefits liability	0	0
Other comprehensive income (loss), before tax	(1,537)	1,037
Income tax expense (benefit) related to items of other comprehensive income (loss)	(323)	216
Other comprehensive income (loss), after tax	(1,214)	821
Comprehensive income (loss)	(1,082)	805
Less: Comprehensive income (loss) attributable to noncontrolling interest	0	0
Comprehensive income (loss) attributable to Voya Financial, Inc.	(1,082)	805
Non-Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Net income (loss)	(26)	177
Other comprehensive income (loss), before tax:
Unrealized gains (losses) on securities	(1,885)	1,284
Impairments	0	1
Pension and other postretirement benefits liability	(1)	(1)
Other comprehensive income (loss), before tax	(1,886)	1,284
Income tax expense (benefit) related to items of other comprehensive income (loss)	(396)	268
Other comprehensive income (loss), after tax	(1,490)	1,016
Comprehensive income (loss)	(1,516)	1,193
Less: Comprehensive income (loss) attributable to noncontrolling interest	6	(1)
Comprehensive income (loss) attributable to Voya Financial, Inc.	$ (1,522)	$ 1,194