Segment Information - Reconciliation of Revenue from Segments to Consolidated (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Segment Reporting Information [Line Items]
Operating revenues	$ 4,726	$ 4,527	$ 9,411	$ 9,111
Revenue adjustments from annuity and life insurance product features	(590)	105	(364)	(474)
Credit loss-related adjustments	(25)	(34)	(53)	(36)
Investment gains (losses)	(81)	(230)	(183)	(311)
Changes in the fair value of reinsurance-related embedded derivatives, trading securities and certain mortgage loans	14	201	(76)	395
Gains (losses) on other non-financial assets - sale of subsidiaries/businesses		584		584
Total revenues	4,044	5,153	8,735	9,269
Other Operations
Segment Reporting Information [Line Items]
Operating revenues	41	39	94	66
Revenue adjustments from annuity and life insurance product features	0	0	0	0
Credit loss-related adjustments	(14)	(9)	(22)	(11)
Investment gains (losses)	(51)	(119)	(37)	(184)
Changes in the fair value of reinsurance-related embedded derivatives, trading securities and certain mortgage loans	1	(3)	(10)	(11)
Gains (losses) on other non-financial assets - sale of subsidiaries/businesses		584		584
Total revenues	(23)	492	25	444
Annuities | Operating Segments
Segment Reporting Information [Line Items]
Operating revenues	1,214	1,209	2,412	2,477
Revenue adjustments from annuity and life insurance product features	(526)	126	(317)	(320)
Credit loss-related adjustments	(2)	(19)	(19)	(23)
Investment gains (losses)	(2)	9	(8)	27
Changes in the fair value of reinsurance-related embedded derivatives, trading securities and certain mortgage loans	0	0	10	(3)
Gains (losses) on other non-financial assets - sale of subsidiaries/businesses		0		0
Total revenues	684	1,325	2,078	2,158
Life Insurance | Operating Segments
Segment Reporting Information [Line Items]
Operating revenues	1,602	1,511	3,188	3,052
Revenue adjustments from annuity and life insurance product features	(64)	(21)	(47)	(154)
Credit loss-related adjustments	(2)	7	(1)	11
Investment gains (losses)	(25)	(119)	(133)	(148)
Changes in the fair value of reinsurance-related embedded derivatives, trading securities and certain mortgage loans	13	204	(76)	409
Gains (losses) on other non-financial assets - sale of subsidiaries/businesses		0		0
Total revenues	1,524	1,582	2,931	3,170
Group Protection | Operating Segments
Segment Reporting Information [Line Items]
Operating revenues	1,538	1,441	3,059	2,867
Revenue adjustments from annuity and life insurance product features	0	0	0	0
Credit loss-related adjustments	0	0	(2)	0
Investment gains (losses)	0	(1)	1	(1)
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	1,538	1,440	3,058	2,866
Retirement Plan Services | Operating Segments
Segment Reporting Information [Line Items]
Operating revenues	331	327	658	649
Revenue adjustments from annuity and life insurance product features	0	0	0	0
Credit loss-related adjustments	(7)	(13)	(9)	(13)
Investment gains (losses)	(3)	0	(6)	(5)
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	$ 321	$ 314	$ 643	$ 631