Policyholder Account Balances - Summary of Balances and Changes in Policyholder Account Balances (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Policyholder Account Balance [Roll Forward]
Balance as of beginning-of-year	$ 114,435
Interest credited	3,248	$ 2,877	$ 2,929
Balance as of end-of-year	120,737	114,435
Variable Annuities
Policyholder Account Balance [Roll Forward]
Balance as of beginning-of-year	22,184	19,148
Gross deposits	4,709	5,178
Withdrawals	(742)	(417)
Policyholder assessments	(1)	(2)
Net transfers from (to) separate account	(427)	(492)
Interest credited	548	287
Change in fair value of embedded derivative instrument	2,870	(1,518)
Balance as of end-of-year	$ 29,141	$ 22,184	19,148
Weighted-average crediting rate	2.10%	1.40%
Net amount at risk	$ 3,031	$ 7,974
Cash surrender value	27,975	21,147
Fixed Annuities
Policyholder Account Balance [Roll Forward]
Balance as of beginning-of-year	23,365	22,552
Gross deposits	5,130	3,284
Withdrawals	(3,929)	(2,514)
Policyholder assessments	(56)	(51)
Net transfers from (to) separate account	0	0
Interest credited	643	532
Change in fair value of embedded derivative instrument	202	(438)
Balance as of end-of-year	$ 25,355	$ 23,365	22,552
Weighted-average crediting rate	2.70%	2.40%
Net amount at risk	$ 203	$ 171
Cash surrender value	24,349	22,529
UL and Other
Policyholder Account Balance [Roll Forward]
Balance as of beginning-of-year	37,694	38,200
Gross deposits	3,755	3,921
Withdrawals	(1,454)	(1,244)
Policyholder assessments	(4,512)	(4,496)
Net transfers from (to) separate account	97	2
Interest credited	1,479	1,494
Change in fair value of embedded derivative instrument	121	(183)
Balance as of end-of-year	$ 37,180	$ 37,694	38,200
Weighted-average crediting rate	4.00%	3.90%
Net amount at risk	$ 302,712	$ 304,348
Cash surrender value	33,629	34,210
Retirement Plan Services
Policyholder Account Balance [Roll Forward]
Balance as of beginning-of-year	25,138	23,579
Gross deposits	2,776	4,012
Withdrawals	(4,494)	(3,579)
Policyholder assessments	(14)	(13)
Net transfers from (to) separate account	(295)	510
Interest credited	673	629
Change in fair value of embedded derivative instrument	0	0
Balance as of end-of-year	$ 23,784	$ 25,138	$ 23,579
Weighted-average crediting rate	2.70%	2.60%
Net amount at risk	$ 4	$ 15
Cash surrender value	$ 23,765	$ 25,133