Policyholders' Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024		Dec. 31, 2023		Dec. 31, 2022
Additional Liability, Long-Duration Insurance [Roll Forward]
Balance, beginning of period	$ 52,986,700	[1]	$ 41,912,536
Transfer (to) from separate account	481,062		1,190,696		$ 420,021
Unearned revenue reserve	4,415,187		3,741,426		3,067,336
Other	107,324		102,583		100,980
Total Policyholders' account balance	$ 69,628,318		$ 52,986,700	[1]	$ 41,912,536
Weighted-average crediting rate	2.23%		2.12%		2.26%
Net amount at risk	$ 345,969,582		$ 323,508,447		$ 304,864,585
Cash surrender value	60,772,383		44,474,822		33,949,928
As Previously Reported
Additional Liability, Long-Duration Insurance [Roll Forward]
Balance, beginning of period	53,012,800
Total Policyholders' account balance			53,012,800
Total
Additional Liability, Long-Duration Insurance [Roll Forward]
Balance, beginning of period	49,142,691		38,744,220		33,492,392
Deposits	15,688,604		9,363,655		7,478,092
Interest credited	1,309,522		901,157		813,272
Policy charges	(1,869,445)		(1,842,450)		(1,806,479)
Surrenders and withdrawals	(2,115,797)		(1,591,318)		(1,223,874)
Benefit payments	(156,746)		(164,392)		(229,040)
Transfer (to) from separate account	481,062		1,190,696		420,021
Change in market value and other adjustments	2,625,916		2,541,123		(200,164)
Balance, end of period	65,105,807		49,142,691		38,744,220
Total Policyholders' account balance			49,142,691		38,744,220
Fixed Annuities
Additional Liability, Long-Duration Insurance [Roll Forward]
Balance, beginning of period	6,164,313		3,575,823		3,005,867
Deposits	5,215,817		2,612,775		754,397
Interest credited	222,516		101,192		53,884
Policy charges	(5,290)		(8,438)		(5,118)
Surrenders and withdrawals	(554,653)		(229,843)		(68,343)
Benefit payments	(55,956)		(50,522)		(90,640)
Transfer (to) from separate account	0		0		0
Change in market value and other adjustments	210,590		163,326		(74,224)
Balance, end of period	$ 11,197,337		6,164,313		3,575,823
Total Policyholders' account balance			$ 6,164,313		$ 3,575,823
Weighted-average crediting rate	2.56%		2.08%		1.64%
Net amount at risk	$ 11		$ 15		$ 3
Cash surrender value	9,863,990		5,307,537		2,968,033
Variable Annuties
Additional Liability, Long-Duration Insurance [Roll Forward]
Balance, beginning of period	22,810,665		16,432,032		11,723,977
Deposits	8,315,212		4,633,727		4,550,660
Interest credited	516,018		243,908		175,574
Policy charges	(32,987)		(23,368)		(5,482)
Surrenders and withdrawals	(782,216)		(516,039)		(282,497)
Benefit payments	(30,427)		(30,461)		(35,042)
Transfer (to) from separate account	100,193		15,121		206,269
Change in market value and other adjustments	2,320,873		2,055,745		98,573
Balance, end of period	$ 33,217,331		22,810,665		16,432,032
Total Policyholders' account balance			$ 22,810,665		$ 16,432,032
Weighted-average crediting rate	1.72%		1.40%		1.26%
Net amount at risk	$ 0		$ 0		$ 0
Cash surrender value	31,516,776		20,490,433		13,844,151
Variable / Universal Life
Additional Liability, Long-Duration Insurance [Roll Forward]
Balance, beginning of period	20,167,713		18,736,365		18,762,548
Deposits	2,157,575		2,117,153		2,173,035
Interest credited	570,988		556,057		583,814
Policy charges	(1,831,168)		(1,810,644)		(1,795,879)
Surrenders and withdrawals	(778,928)		(845,436)		(873,034)
Benefit payments	(70,363)		(83,409)		(103,358)
Transfer (to) from separate account	380,869		1,175,575		213,752
Change in market value and other adjustments	94,453		322,052		(224,513)
Balance, end of period	$ 20,691,139		20,167,713		18,736,365
Total Policyholders' account balance			$ 20,167,713		$ 18,736,365
Weighted-average crediting rate	2.79%		2.86%		3.11%
Net amount at risk	$ 345,969,571		$ 323,508,432		$ 304,864,582
Cash surrender value	19,391,617		18,676,852		17,137,744
Variable Life
Additional Liability, Long-Duration Insurance [Roll Forward]
Transfer (to) from separate account	$ 380,869		1,175,575		$ 213,752
Policy loans | Variable Life
Additional Liability, Long-Duration Insurance [Roll Forward]
Transfer (to) from separate account			$ 900,000

[1] Amounts reflect revision to prior period Financial Statements. See Note 17 for additional information.