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	$ 120,316
Interest credited	752	$ 781
Balance as of end-of-period	121,891
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
derivative instruments	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	25,330	23,338
Gross deposits	972	1,317
Withdrawals	(1,409)	(889)
Policyholder assessments	(17)	(15)
Net transfers from (to) separate account	0	0
Interest credited	183	154
derivative instruments	78	88
Balance as of end-of-period	$ 25,137	$ 23,993
Weighted-average crediting rate	2.90%	2.60%
Net amount at risk	$ 210	$ 192
Cash surrender value	24,114	23,099
UL and Other
Policyholder Account Balance [Roll Forward]
Balance as of beginning-of-year	36,784	37,258
Gross deposits	847	922
Withdrawals	(356)	(387)
Policyholder assessments	(1,112)	(1,117)
Net transfers from (to) separate account	38	32
Interest credited	360	369
derivative instruments	61	29
Balance as of end-of-period	$ 36,622	$ 37,106
Weighted-average crediting rate	3.90%	4.00%
Net amount at risk	$ 299,063	$ 301,582
Cash surrender value	32,282	32,960
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
derivative instruments	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