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	$ 12,078	$ 15,059	$ 17,139
Revenue adjustments from annuity and life insurance product features	922	99	872
Credit loss-related adjustments	(152)	(74)	(129)
Investment gains (losses)	(311)	(4,080)	19
Changes in the fair value of reinsurance-related embedded derivatives, trading securities and certain mortgage loans	203	(22)	588
GLB rider fees ceded to LNBAR	(933)	(923)	(932)
Gains (losses) on other non-financial assets - sale of subsidiaries/businesses	481
Total revenues	12,288	10,059	17,557
Other Operations
Segment Reporting Information [Line Items]
Operating revenues	149	(778)	133
Revenue adjustments from annuity and life insurance product features	0	0	0
Credit loss-related adjustments	(35)	(6)	5
Investment gains (losses)	(229)	(94)	(28)
Changes in the fair value of reinsurance-related embedded derivatives, trading securities and certain mortgage loans	22	(1)	(4)
GLB rider fees ceded to LNBAR	0	0	0
Gains (losses) on other non-financial assets - sale of subsidiaries/businesses	481
Total revenues	388	(879)	106
Annuities | Operating Segments
Segment Reporting Information [Line Items]
Operating revenues	4,549	2,625	4,102
Revenue adjustments from annuity and life insurance product features	1,175	509	838
Credit loss-related adjustments	(71)	(14)	(10)
Investment gains (losses)	(13)	(78)	(20)
Changes in the fair value of reinsurance-related embedded derivatives, trading securities and certain mortgage loans	104	(76)	84
GLB rider fees ceded to LNBAR	(932)	(922)	(931)
Gains (losses) on other non-financial assets - sale of subsidiaries/businesses	0
Total revenues	4,812	2,044	4,063
Life Insurance | Operating Segments
Segment Reporting Information [Line Items]
Operating revenues	4,988	6,362	6,344
Revenue adjustments from annuity and life insurance product features	(253)	(411)	34
Credit loss-related adjustments	(10)	(49)	(124)
Investment gains (losses)	9	(3,867)	83
Changes in the fair value of reinsurance-related embedded derivatives, trading securities and certain mortgage loans	87	55	508
GLB rider fees ceded to LNBAR	0	0	0
Gains (losses) on other non-financial assets - sale of subsidiaries/businesses	0
Total revenues	4,821	2,090	6,845
Group Protection | Operating Segments
Segment Reporting Information [Line Items]
Operating revenues	1,088	5,560	5,303
Revenue adjustments from annuity and life insurance product features	0	0	0
Credit loss-related adjustments	(4)	(4)	3
Investment gains (losses)	(8)	(6)	(3)
Changes in the fair value of reinsurance-related embedded derivatives, trading securities and certain mortgage loans	(10)	0	0
GLB rider fees ceded to LNBAR	0	0	0
Gains (losses) on other non-financial assets - sale of subsidiaries/businesses	0
Total revenues	1,066	5,550	5,303
Retirement Plan Services | Operating Segments
Segment Reporting Information [Line Items]
Operating revenues	1,304	1,290	1,257
Revenue adjustments from annuity and life insurance product features	0	1	0
Credit loss-related adjustments	(32)	(1)	(3)
Investment gains (losses)	(70)	(35)	(13)
Changes in the fair value of reinsurance-related embedded derivatives, trading securities and certain mortgage loans	0	0	0
GLB rider fees ceded to LNBAR	(1)	(1)	(1)
Gains (losses) on other non-financial assets - sale of subsidiaries/businesses	0
Total revenues	$ 1,201	$ 1,254	$ 1,240