Policyholders' Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023		Dec. 31, 2022		Dec. 31, 2021
Additional Liability, Long-Duration Insurance [Roll Forward]
Balance, beginning of period	$ 41,912,536	[1]	$ 35,730,680
Transfer (to) from separate account	1,190,696		420,021		$ 160,956
Unearned revenue reserve	3,741,426		3,067,336		2,398,788
Other	102,583		100,980		98,066
Total Policyholders' account balance	$ 53,012,800		$ 41,912,536	[1]	$ 35,730,680
Weighted-average crediting rate	2.12%		2.26%		2.31%
Net amount at risk	$ 323,508,447		$ 304,864,585		$ 309,431,313
Cash surrender value	44,474,822		33,949,928		30,643,428
Total
Additional Liability, Long-Duration Insurance [Roll Forward]
Balance, beginning of period	38,744,220		33,233,826		22,378,064
Deposits	9,363,655		7,688,979		3,645,078
Interest credited	934,957		813,272		604,025
Policy charges	(1,842,450)		(1,806,479)		(1,747,547)
Surrenders and withdrawals	(1,591,318)		(1,223,874)		(1,240,533)
Benefit payments	(164,392)		(229,040)		(262,334)
Transfer (to) from separate account	1,190,696		420,021		160,956
Change in market value and other adjustments	2,533,423		(152,485)		9,696,117
Balance, end of period	49,168,791		38,744,220		33,233,826
Less: Reinsurance and other recoverable	13,405,290		13,226,222		12,053,936
Policyholders' account balance net of reinsurance and other recoverables	35,763,501		25,517,998		21,179,890
Total Policyholders' account balance			38,744,220		33,233,826
Fixed Annuities
Additional Liability, Long-Duration Insurance [Roll Forward]
Balance, beginning of period	3,575,823		3,005,867		379,981
Deposits	2,612,775		754,397		396,377
Interest credited	101,192		53,884		1,181
Policy charges	(8,438)		(5,118)		(5,346)
Surrenders and withdrawals	(229,843)		(68,343)		(41,886)
Benefit payments	(50,522)		(90,640)		(87,897)
Transfer (to) from separate account	0		0		0
Change in market value and other adjustments	163,326		(74,224)		2,363,457
Balance, end of period	6,164,313		3,575,823		3,005,867
Less: Reinsurance and other recoverable	4,746		5,724		7,066
Policyholders' account balance net of reinsurance and other recoverables	$ 6,159,567		3,570,099		2,998,801
Total Policyholders' account balance			$ 3,575,823		$ 3,005,867
Weighted-average crediting rate	2.08%		1.64%		0.07%
Net amount at risk	$ 15		$ 3		$ 0
Cash surrender value	5,307,537		2,968,033		2,476,677
Variable Annuties
Additional Liability, Long-Duration Insurance [Roll Forward]
Balance, beginning of period	16,432,032		11,465,411		3,634,125
Deposits	4,633,727		4,761,547		725,701
Interest credited	277,708		175,574		94,453
Policy charges	(23,368)		(5,482)		(1,941)
Surrenders and withdrawals	(516,039)		(282,497)		(208,224)
Benefit payments	(30,461)		(35,042)		(41,851)
Transfer (to) from separate account	15,121		206,269		(3,449)
Change in market value and other adjustments	2,048,045		146,252		7,266,597
Balance, end of period	22,836,765		16,432,032		11,465,411
Less: Reinsurance and other recoverable	569,844		323,981		340,527
Policyholders' account balance net of reinsurance and other recoverables	$ 22,266,921		16,108,051		11,124,884
Total Policyholders' account balance			$ 16,432,032		$ 11,465,411
Weighted-average crediting rate	1.40%		1.26%		1.25%
Net amount at risk	$ 0		$ 0		$ 0
Cash surrender value	20,490,433		13,844,151		11,250,816
Variable Annuties | PALAC
Additional Liability, Long-Duration Insurance [Roll Forward]
Change in market value and other adjustments					7,203,000
Variable / Universal Life
Additional Liability, Long-Duration Insurance [Roll Forward]
Balance, beginning of period	18,736,365		18,762,548		18,363,958
Deposits	2,117,153		2,173,035		2,523,000
Interest credited	556,057		583,814		508,391
Policy charges	(1,810,644)		(1,795,879)		(1,740,260)
Surrenders and withdrawals	(845,436)		(873,034)		(990,423)
Benefit payments	(83,409)		(103,358)		(132,586)
Transfer (to) from separate account	1,175,575		213,752		164,405
Change in market value and other adjustments	322,052		(224,513)		66,063
Balance, end of period	20,167,713		18,736,365		18,762,548
Less: Reinsurance and other recoverable	12,830,700		12,896,517		11,706,343
Policyholders' account balance net of reinsurance and other recoverables	$ 7,337,013		5,839,848		7,056,205
Total Policyholders' account balance			$ 18,736,365		$ 18,762,548
Weighted-average crediting rate	2.86%		3.11%		2.74%
Net amount at risk	$ 323,508,432		$ 304,864,582		$ 309,431,313
Cash surrender value	18,676,852		17,137,744		16,915,935
Variable Life
Additional Liability, Long-Duration Insurance [Roll Forward]
Transfer (to) from separate account	1,175,575		$ 213,752		$ 164,405
Policy loans | Variable Life
Additional Liability, Long-Duration Insurance [Roll Forward]
Transfer (to) from separate account	$ 900,000

[1] Prior period amounts reflect the implementation of Accounting Standard Update ("ASU") 2018-12: Targeted Improvements to the Accounting for Long-Duration Contracts.