Segment Information - Reconciliation of Revenue from Segments to Consolidated (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Segment Reporting Information [Line Items]
Operating revenues	$ 4,780	$ 4,603	$ 14,190	$ 13,714
Revenue adjustments from annuity and life insurance product features	39	149	(325)	(325)
Credit loss-related adjustments	(38)	(88)	(91)	(124)
Investment gains (losses)	(35)	(105)	(218)	(416)
Changes in the fair value of reinsurance-related embedded derivatives, trading securities and certain mortgage loans	(191)	(446)	(266)	(51)
Gains (losses) on other non-financial assets - sale of subsidiaries/businesses		(2)		582
Total revenues	4,555	4,111	13,290	13,380
Other Operations
Segment Reporting Information [Line Items]
Operating revenues	50	52	143	118
Revenue adjustments from annuity and life insurance product features	0	0	0	0
Credit loss-related adjustments	(28)	(20)	(48)	(32)
Investment gains (losses)	(19)	(31)	(56)	(214)
Changes in the fair value of reinsurance-related embedded derivatives, trading securities and certain mortgage loans	2	16	(7)	5
Gains (losses) on other non-financial assets - sale of subsidiaries/businesses		(2)		582
Total revenues	5	15	32	459
Annuities | Operating Segments
Segment Reporting Information [Line Items]
Operating revenues	1,270	1,195	3,682	3,673
Revenue adjustments from annuity and life insurance product features	73	285	(244)	(35)
Credit loss-related adjustments	10	(44)	(10)	(67)
Investment gains (losses)	2	(43)	(6)	(16)
Changes in the fair value of reinsurance-related embedded derivatives, trading securities and certain mortgage loans	0	(7)	10	(9)
Gains (losses) on other non-financial assets - sale of subsidiaries/businesses		0		0
Total revenues	1,355	1,386	3,431	3,546
Life Insurance | Operating Segments
Segment Reporting Information [Line Items]
Operating revenues	1,610	1,589	4,798	4,640
Revenue adjustments from annuity and life insurance product features	(34)	(136)	(81)	(290)
Credit loss-related adjustments	(17)	(8)	(18)	4
Investment gains (losses)	(17)	(24)	(150)	(172)
Changes in the fair value of reinsurance-related embedded derivatives, trading securities and certain mortgage loans	(193)	(455)	(269)	(47)
Gains (losses) on other non-financial assets - sale of subsidiaries/businesses		0		0
Total revenues	1,349	966	4,280	4,135
Group Protection | Operating Segments
Segment Reporting Information [Line Items]
Operating revenues	1,507	1,432	4,566	4,299
Revenue adjustments from annuity and life insurance product features	0	0	0	0
Credit loss-related adjustments	(2)	(2)	(5)	(2)
Investment gains (losses)	(1)	(1)	0	(2)
Changes in the fair value of reinsurance-related embedded derivatives, trading securities and certain mortgage loans	0	0	0	0
Gains (losses) on other non-financial assets - sale of subsidiaries/businesses		0		0
Total revenues	1,504	1,429	4,561	4,295
Retirement Plan Services | Operating Segments
Segment Reporting Information [Line Items]
Operating revenues	343	335	1,001	984
Revenue adjustments from annuity and life insurance product features	0	0	0	0
Credit loss-related adjustments	(1)	(14)	(10)	(27)
Investment gains (losses)	0	(6)	(6)	(12)
Changes in the fair value of reinsurance-related embedded derivatives, trading securities and certain mortgage loans	0	0	0	0
Gains (losses) on other non-financial assets - sale of subsidiaries/businesses		0		0
Total revenues	$ 342	$ 315	$ 986	$ 945