Policyholders' Liabilities (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Additional Liability, Long-Duration Insurance [Roll Forward]
Balance, beginning of period	$ 53,012,800
Transfer to (from) Policyholder Account Balance (to) from Separate Account	323,706	$ 1,119,645
Unearned revenue reserve	4,248,795	3,568,084
Other	106,109	102,815
Total Policyholders' account balance	$ 65,658,560	$ 49,662,070
Weighted-average crediting rate	2.19%	2.15%
Net amount at risk	$ 336,737,805	$ 318,075,717
Cash surrender value	57,287,463	40,991,161
Total
Additional Liability, Long-Duration Insurance [Roll Forward]
Balance, beginning of period	49,168,791	38,744,221
Deposits	11,643,193	6,784,777
Interest credited	909,031	684,459
Policy charges	(1,395,264)	(1,379,610)
Surrenders and withdrawals	(1,563,648)	(1,093,317)
Benefit payments	(114,435)	(121,799)
Transfer to (from) Policyholder Account Balance (to) from Separate Account	323,706	1,119,645
Change in market value and other adjustments	2,332,282	1,252,795
Balance, end of period	61,303,656	45,991,171
Fixed Annuities
Additional Liability, Long-Duration Insurance [Roll Forward]
Balance, beginning of period	6,164,313	3,575,824
Deposits	4,149,820	1,801,985
Interest credited	150,642	73,763
Policy charges	(4,168)	(5,683)
Surrenders and withdrawals	(409,573)	(161,929)
Benefit payments	(42,344)	(37,459)
Transfer to (from) Policyholder Account Balance (to) from Separate Account	0	0
Change in market value and other adjustments	218,164	81,544
Balance, end of period	10,226,854	5,328,045
Total Policyholders' account balance	$ 4,484,236	$ 2,025,288
Weighted-average crediting rate	2.45%	2.21%
Net amount at risk	$ 16	$ 12
Cash surrender value	9,070,551	4,491,679
Variable Annuity
Additional Liability, Long-Duration Insurance [Roll Forward]
Balance, beginning of period	22,836,765	16,432,032
Deposits	5,900,477	3,439,562
Interest credited	332,007	194,853
Policy charges	(21,369)	(16,564)
Surrenders and withdrawals	(558,335)	(351,475)
Benefit payments	(21,840)	(22,285)
Transfer to (from) Policyholder Account Balance (to) from Separate Account	48,394	4,467
Change in market value and other adjustments	1,974,887	1,095,144
Balance, end of period	30,490,986	20,775,734
Total Policyholders' account balance	$ 2,631,165	$ 3,004,628
Weighted-average crediting rate	1.66%	1.40%
Net amount at risk	$ 0	$ 0
Cash surrender value	29,028,016	17,981,713
Variable/Universal Life
Additional Liability, Long-Duration Insurance [Roll Forward]
Balance, beginning of period	20,167,713	18,736,365
Deposits	1,592,896	1,543,230
Interest credited	426,382	415,843
Policy charges	(1,369,727)	(1,357,363)
Surrenders and withdrawals	(595,740)	(579,913)
Benefit payments	(50,251)	(62,055)
Transfer to (from) Policyholder Account Balance (to) from Separate Account	275,312	1,115,178
Change in market value and other adjustments	139,231	76,107
Balance, end of period	20,585,816	19,887,392
Total Policyholders' account balance	$ 17,479,678	$ 17,508,112
Weighted-average crediting rate	2.79%	2.87%
Net amount at risk	$ 336,737,789	$ 318,075,705
Cash surrender value	$ 19,188,896	$ 18,517,769