Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended								9 Months Ended	12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 385	$ (213)	$ (141)	$ (80)	$ (784)	$ 152	$ 257	$ 65	$ (434)	$ (49)	$ (310)	$ 907
Other comprehensive income (loss), before tax:
Unrealized gains (losses) on securities		462							1,359	1,986	3,013	(2,810)
Impairments		0							0	1	3	32
Pension and other postretirement benefits liability		0							2	(3)	(4)	(11)
Other comprehensive income (loss), before tax		462							1,357	1,984	3,012	(2,789)
Income tax expense (benefit) related to items of other comprehensive income (loss)		97							285	417	631	(693)
Other comprehensive income (loss), after tax		365							1,072	1,567	2,381	(2,096)
Comprehensive income (loss)		152							638	1,518	2,071	(1,189)
Less: Comprehensive income (loss) attributable to noncontrolling interest		106							33	157	50	145
Comprehensive income (loss) attributable to Voya Financial, Inc.		$ 46							$ 605	$ 1,361	$ 2,021	$ (1,334)