Policyholder Account Balances - Summary of Balances and Changes in Policyholder Account Balances (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Policyholder Account Balance [Roll Forward]
Balance as of beginning-of-year	$ 120,316
Interest credited	3,160	$ 3,202	$ 2,860
Balance as of end-of-year	125,818	120,316
Variable Annuities
Policyholder Account Balance [Roll Forward]
Balance as of beginning-of-year	29,141	22,184
Gross deposits	4,756	4,709
Withdrawals	(1,321)	(742)
Policyholder assessments	(1)	(1)
Net transfers from (to) separate account	(477)	(427)
Interest credited	695	548
Change in fair value of embedded derivative instrument and other	2,474	2,870
Balance as of end-of-year	$ 35,267	$ 29,141	22,184
Weighted-average crediting rate	2.10%	2.10%
Net amount at risk	$ 1,962	$ 3,031
Cash surrender value	34,018	27,975
Fixed Annuities
Policyholder Account Balance [Roll Forward]
Balance as of beginning-of-year	25,330	23,338
Gross deposits	4,226	5,130
Withdrawals	(4,825)	(3,926)
Policyholder assessments	(61)	(56)
Net transfers from (to) separate account	0	0
Interest credited	802	642
Change in fair value of embedded derivative instrument and other	469	202
Balance as of end-of-year	$ 25,941	$ 25,330	23,338
Weighted-average crediting rate	3.10%	2.70%
Net amount at risk	$ 240	$ 203
Cash surrender value	24,845	24,324
UL and Other
Policyholder Account Balance [Roll Forward]
Balance as of beginning-of-year	36,784	37,258
Gross deposits	3,605	3,739
Withdrawals	(1,438)	(1,430)
Policyholder assessments	(4,480)	(4,464)
Net transfers from (to) separate account	196	97
Interest credited	1,459	1,463
Change in fair value of embedded derivative instrument and other	116	121
Balance as of end-of-year	$ 36,242	$ 36,784	37,258
Weighted-average crediting rate	4.00%	4.00%
Net amount at risk	$ 295,984	$ 300,994
Cash surrender value	31,992	32,585
Retirement Plan Services
Policyholder Account Balance [Roll Forward]
Balance as of beginning-of-year	23,784	25,138
Gross deposits	3,407	2,776
Withdrawals	(4,495)	(4,494)
Policyholder assessments	(14)	(14)
Net transfers from (to) separate account	251	(295)
Interest credited	686	673
Change in fair value of embedded derivative instrument and other	0	0
Balance as of end-of-year	$ 23,619	$ 23,784	$ 25,138
Weighted-average crediting rate	2.90%	2.70%
Net amount at risk	$ 3	$ 4
Cash surrender value	$ 23,586	$ 23,765