Policyholder Account Balances, Future Policy Benefits and Claims - Balance of and Changes in Policyholder Account Balances (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Policyholder Account Balance [Roll Forward]
Beginning balance	$ 24,986	$ 23,723
Contract deposits	3,884	3,620
Policy charges	(401)	(393)
Surrenders and other benefits	(2,382)	(1,619)
Net transfer from (to) separate account liabilities	(132)	(162)
Other variable account adjustments	1,403	(791)
Interest credited	589	608
Ending balance	27,947	24,986
Variable Annuities
Policyholder Account Balance [Roll Forward]
Beginning balance	4,752	4,972
Contract deposits	73	146
Policy charges	(10)	(8)
Surrenders and other benefits	(759)	(450)
Net transfer from (to) separate account liabilities	(25)	(60)
Other variable account adjustments	0	0
Interest credited	142	152
Ending balance	$ 4,173	$ 4,752
Weighted-average crediting rate	3.30%	3.20%
Cash surrender value	$ 4,146	$ 4,720
Structured Variable Annuities
Policyholder Account Balance [Roll Forward]
Beginning balance	6,410	4,458
Contract deposits	3,084	2,784
Policy charges	0	0
Surrenders and other benefits	(156)	(41)
Net transfer from (to) separate account liabilities	0	0
Other variable account adjustments	1,403	(791)
Interest credited	1	0
Ending balance	$ 10,742	$ 6,410
Weighted-average crediting rate	1.80%	1.10%
Cash surrender value	$ 10,129	$ 5,986
Fixed Annuities
Policyholder Account Balance [Roll Forward]
Beginning balance	6,799	7,251
Contract deposits	47	55
Policy charges	0	0
Surrenders and other benefits	(1,086)	(744)
Net transfer from (to) separate account liabilities	0	0
Other variable account adjustments	0	0
Interest credited	222	237
Ending balance	$ 5,982	$ 6,799
Weighted-average crediting rate	3.60%	3.50%
Cash surrender value	$ 5,974	$ 6,786
Fixed Indexed Annuities
Policyholder Account Balance [Roll Forward]
Beginning balance	312	323
Contract deposits	0	0
Policy charges	0	0
Surrenders and other benefits	(10)	(17)
Net transfer from (to) separate account liabilities	0	0
Other variable account adjustments	0	0
Interest credited	5	6
Ending balance	$ 307	$ 312
Weighted-average crediting rate	2.00%	1.90%
Cash surrender value	$ 278	$ 277
Non-Life Contingent Payout Annuities
Policyholder Account Balance [Roll Forward]
Beginning balance	471	527
Contract deposits	91	53
Policy charges	0	0
Surrenders and other benefits	(127)	(124)
Net transfer from (to) separate account liabilities	0	0
Other variable account adjustments	0	0
Interest credited	9	15
Ending balance	444	471
Universal Life Insurance
Policyholder Account Balance [Roll Forward]
Beginning balance	1,544	1,602
Contract deposits	123	134
Policy charges	(176)	(178)
Surrenders and other benefits	(69)	(67)
Net transfer from (to) separate account liabilities	0	0
Other variable account adjustments	0	0
Interest credited	52	53
Ending balance	$ 1,474	$ 1,544
Weighted-average crediting rate	3.60%	3.60%
Net amount at risk	$ 8,740	$ 9,187
Cash surrender value	1,330	1,382
Variable Universal Life Insurance
Policyholder Account Balance [Roll Forward]
Beginning balance	1,520	1,493
Contract deposits	272	233
Policy charges	(94)	(91)
Surrenders and other benefits	(78)	(70)
Net transfer from (to) separate account liabilities	(107)	(102)
Other variable account adjustments	0	0
Interest credited	56	57
Ending balance	$ 1,569	$ 1,520
Weighted-average crediting rate	3.90%	3.90%
Net amount at risk	$ 57,291	$ 57,354
Cash surrender value	1,065	1,054
Indexed Universal Life Insurance
Policyholder Account Balance [Roll Forward]
Beginning balance	2,654	2,534
Contract deposits	193	218
Policy charges	(121)	(116)
Surrenders and other benefits	(53)	(50)
Net transfer from (to) separate account liabilities	0	0
Other variable account adjustments	0	0
Interest credited	82	68
Ending balance	$ 2,755	$ 2,654
Weighted-average crediting rate	2.00%	2.00%
Net amount at risk	$ 14,407	$ 15,043
Cash surrender value	2,271	2,148
Other Life Insurance, Netting
Policyholder Account Balance [Roll Forward]
Beginning balance	524	563
Contract deposits	1	(3)
Policy charges	0	0
Surrenders and other benefits	(44)	(56)
Net transfer from (to) separate account liabilities	0	0
Other variable account adjustments	0	0
Interest credited	20	20
Ending balance	$ 501	$ 524
Weighted-average crediting rate	4.00%	4.00%
Net amount at risk	$ 141	$ 149
Cash surrender value	$ 326	$ 348