Contractholder Funds - Summary of Balances and Changes in Contractholder Funds (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Policyholder Account Balance [Roll Forward]
Balance, beginning of year	$ 48,798
Balance, end of year	50,875		$ 48,798
Change in fair value of other derivatives and embedded derivatives	3	$ 2
Gross Liability, end of period	50,875		48,798
Reinsurance recoverable, net of allowance for credit losses of $21 and $21 at March 31, 2024 and December 31, 2023, respectively	(10,112)		(8,960)
Indexed annuities
Policyholder Account Balance [Roll Forward]
Balance, beginning of year	27,164	24,766	24,766
Issuances	1,381		4,722
Premiums received	28		103
Policy charge	(46)		(182)
Surrenders and withdrawals	(690)		(2,005)
Benefit payments	(119)		(526)
Interest credited	139		270
Other	5		16
Balance, end of year	27,862		27,164
Change in fair value of other derivatives and embedded derivatives	468		243
Gross Liability, end of period	28,330		27,407
Reinsurance recoverable, net of allowance for credit losses of $21 and $21 at March 31, 2024 and December 31, 2023, respectively	(13)		(17)
Net Liability, after Reinsurance	$ 28,317		$ 27,390
Weighted-average crediting rate	2.04%		1.40%
Cash surrender value	$ 25,724		$ 25,099
Fixed rate annuities
Policyholder Account Balance [Roll Forward]
Balance, beginning of year	13,443	9,358	9,358
Issuances	1,341		5,061
Premiums received	0		1
Policy charge	0		0
Surrenders and withdrawals	(364)		(1,142)
Benefit payments	(76)		(240)
Interest credited	142		405
Other	0		0
Balance, end of year	14,486		13,443
Change in fair value of other derivatives and embedded derivatives	0		0
Gross Liability, end of period	14,486		13,443
Reinsurance recoverable, net of allowance for credit losses of $21 and $21 at March 31, 2024 and December 31, 2023, respectively	(8,612)		(7,520)
Net Liability, after Reinsurance	$ 5,874		$ 5,923
Weighted-average crediting rate	4.15%		4.85%
Cash surrender value	$ 13,502		$ 12,505
Universal Life
Policyholder Account Balance [Roll Forward]
Balance, beginning of year	2,391	2,112	2,112
Issuances	51		199
Premiums received	114		382
Policy charge	(74)		(261)
Surrenders and withdrawals	(22)		(90)
Benefit payments	(5)		(27)
Interest credited	33		76
Other	0		0
Balance, end of year	2,488		2,391
Change in fair value of other derivatives and embedded derivatives	107		84
Gross Liability, end of period	2,595		2,475
Reinsurance recoverable, net of allowance for credit losses of $21 and $21 at March 31, 2024 and December 31, 2023, respectively	(894)		(894)
Net Liability, after Reinsurance	$ 1,701		$ 1,581
Weighted-average crediting rate	5.54%		3.44%
Net amount at risk	$ 63,968		$ 60,389
Cash surrender value	1,938		1,872
Funding Agreements, FABN
Policyholder Account Balance [Roll Forward]
Balance, beginning of year	2,613	2,613	2,613
Issuances	0		0
Premiums received	0		0
Policy charge	0		0
Surrenders and withdrawals	0		0
Benefit payments	(16)		(53)
Interest credited	14		54
Other	0		(1)
Balance, end of year	2,611		2,613
Change in fair value of other derivatives and embedded derivatives	0		0
Gross Liability, end of period	2,611		2,613
Reinsurance recoverable, net of allowance for credit losses of $21 and $21 at March 31, 2024 and December 31, 2023, respectively	0		0
Net Liability, after Reinsurance	2,611		2,613
Federal Home Loan Bank Funding Agreements
Policyholder Account Balance [Roll Forward]
Balance, beginning of year	2,539	$ 1,982	1,982
Issuances	305		1,256
Premiums received	0		0
Policy charge	0		0
Surrenders and withdrawals	0		0
Benefit payments	(329)		(763)
Interest credited	24		64
Other	0		0
Balance, end of year	2,539		2,539
Change in fair value of other derivatives and embedded derivatives	0		0
Gross Liability, end of period	2,539		2,539
Reinsurance recoverable, net of allowance for credit losses of $21 and $21 at March 31, 2024 and December 31, 2023, respectively	0		0
Net Liability, after Reinsurance	$ 2,539		$ 2,539