Segment Information - Reconciliation of Revenue from Segments to Consolidated (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Operating revenues	$ 18,342	$ 16,027	$ 17,963
Revenue adjustments from annuity and life insurance product features	(382)	(2,541)	1,009
Credit loss-related adjustments	(152)	(80)	(130)
Investment gains (losses)	(483)	(959)	20
Changes in the fair value of reinsurance-related embedded derivatives, trading securities and certain mortgage loans	535	(802)	(52)
Gains (losses) on other non-financial assets - sale of subsidiaries/businesses	582
Total revenues	18,442	11,645	18,810
Other Operations
Segment Reporting Information [Line Items]
Operating revenues	160	(755)	156
Revenue adjustments from annuity and life insurance product features	0	0	0
Credit loss-related adjustments	(35)	(7)	4
Investment gains (losses)	(231)	(90)	(31)
Changes in the fair value of reinsurance-related embedded derivatives, trading securities and certain mortgage loans	(13)	9	(135)
Gains (losses) on other non-financial assets - sale of subsidiaries/businesses	582
Total revenues	463	(843)	(6)
Annuities | Operating Segments
Segment Reporting Information [Line Items]
Operating revenues	4,896	3,002	4,482
Revenue adjustments from annuity and life insurance product features	(130)	(2,131)	974
Credit loss-related adjustments	(71)	(14)	(10)
Investment gains (losses)	13	(95)	(21)
Changes in the fair value of reinsurance-related embedded derivatives, trading securities and certain mortgage loans	(6)	(30)	84
Gains (losses) on other non-financial assets - sale of subsidiaries/businesses	0
Total revenues	4,702	732	5,509
Life Insurance | Operating Segments
Segment Reporting Information [Line Items]
Operating revenues	6,248	6,907	6,747
Revenue adjustments from annuity and life insurance product features	(252)	(410)	35
Credit loss-related adjustments	(10)	(54)	(124)
Investment gains (losses)	(252)	(733)	88
Changes in the fair value of reinsurance-related embedded derivatives, trading securities and certain mortgage loans	554	(781)	(1)
Gains (losses) on other non-financial assets - sale of subsidiaries/businesses	0
Total revenues	6,288	4,929	6,745
Group Protection | Operating Segments
Segment Reporting Information [Line Items]
Operating revenues	5,717	5,563	5,304
Revenue adjustments from annuity and life insurance product features	0	0	0
Credit loss-related adjustments	(4)	(4)	3
Investment gains (losses)	(2)	(6)	(3)
Changes in the fair value of reinsurance-related embedded derivatives, trading securities and certain mortgage loans	0	0	0
Gains (losses) on other non-financial assets - sale of subsidiaries/businesses	0
Total revenues	5,711	5,553	5,304
Retirement Plan Services | Operating Segments
Segment Reporting Information [Line Items]
Operating revenues	1,321	1,310	1,274
Revenue adjustments from annuity and life insurance product features	0	0	0
Credit loss-related adjustments	(32)	(1)	(3)
Investment gains (losses)	(11)	(35)	(13)
Changes in the fair value of reinsurance-related embedded derivatives, trading securities and certain mortgage loans	0	0	0
Gains (losses) on other non-financial assets - sale of subsidiaries/businesses	0
Total revenues	$ 1,278	$ 1,274	$ 1,258