Policyholder Account Balances - Summary of Balances and Changes in Policyholder Account Balances (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Policyholder Account Balance [Roll Forward]
Balance as of beginning-of-year	$ 120,737
Interest credited	822	$ 785
Balance as of end-of-period	122,300
Variable Annuities
Policyholder Account Balance [Roll Forward]
Balance as of beginning-of-year	29,141	22,184
Gross deposits	973	1,222
Withdrawals	(224)	(170)
Policyholder assessments	0	0
Net transfers from (to) separate account	(178)	(114)
Interest credited	158	109
Change in fair value of embedded derivative instrument	1,538	540
Balance as of end-of-period	$ 31,408	$ 23,771
Weighted-average crediting rate	2.10%	1.90%
Net amount at risk	$ 2,056	$ 6,268
Cash surrender value	30,228	22,698
Fixed Annuities
Policyholder Account Balance [Roll Forward]
Balance as of beginning-of-year	25,355	23,365
Gross deposits	973	1,317
Withdrawals	(1,410)	(889)
Policyholder assessments	(17)	(15)
Net transfers from (to) separate account	0	0
Interest credited	183	154
Change in fair value of embedded derivative instrument	78	87
Balance as of end-of-period	$ 25,162	$ 24,019
Weighted-average crediting rate	2.90%	2.60%
Net amount at risk	$ 210	$ 192
Cash surrender value	24,139	23,125
UL and Other
Policyholder Account Balance [Roll Forward]
Balance as of beginning-of-year	37,180	37,694
Gross deposits	850	926
Withdrawals	(364)	(393)
Policyholder assessments	(1,124)	(1,128)
Net transfers from (to) separate account	38	32
Interest credited	365	373
Change in fair value of embedded derivative instrument	61	29
Balance as of end-of-period	$ 37,006	$ 37,533
Weighted-average crediting rate	3.90%	4.00%
Net amount at risk	$ 300,740	$ 303,412
Cash surrender value	33,314	34,033
Retirement Plan Services
Policyholder Account Balance [Roll Forward]
Balance as of beginning-of-year	23,784	25,138
Gross deposits	790	701
Withdrawals	(1,203)	(1,113)
Policyholder assessments	(3)	(3)
Net transfers from (to) separate account	50	103
Interest credited	168	168
Change in fair value of embedded derivative instrument	0	0
Balance as of end-of-period	$ 23,586	$ 24,994
Weighted-average crediting rate	2.80%	2.70%
Net amount at risk	$ 3	$ 9
Cash surrender value	$ 23,560	$ 24,989