Policyholders' Liabilities (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2024	Jun. 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	210,769	$ 1,040,549
Unearned revenue reserve	4,082,015	3,401,994
Other	104,172	100,675
Total Policyholders' account balance	$ 61,036,866	$ 47,608,155
Weighted-average crediting rate	2.18%	2.20%
Net amount at risk	$ 332,247,819	$ 313,219,015
Cash surrender value	52,757,970	39,708,008
Total
Additional Liability, Long-Duration Insurance [Roll Forward]
Balance, beginning of period	49,168,791	38,744,221
Deposits	7,603,117	4,436,743
Interest credited	577,170	454,975
Policy charges	(922,285)	(916,990)
Surrenders and withdrawals	(998,472)	(735,134)
Benefit payments	(71,548)	(82,866)
Transfer to (from) Policyholder Account Balance (to) from Separate Account	210,769	1,040,549
Change in market value and other adjustments	1,283,137	1,163,988
Balance, end of period	56,850,679	44,105,486
Fixed Annuities
Additional Liability, Long-Duration Insurance [Roll Forward]
Balance, beginning of period	6,164,313	3,575,824
Deposits	2,787,898	1,180,342
Interest credited	90,612	44,970
Policy charges		(3,078)
Surrenders and withdrawals	(251,521)	(101,470)
Benefit payments	(24,948)	(25,668)
Transfer to (from) Policyholder Account Balance (to) from Separate Account	0	0
Change in market value and other adjustments	124,805	69,817
Balance, end of period	8,891,072	4,740,737
Total Policyholders' account balance	$ 3,701,038	$ 1,726,600
Weighted-average crediting rate	2.41%	2.15%
Net amount at risk	$ 20	$ 38
Cash surrender value	7,711,710	3,975,581
Variable Annuity
Additional Liability, Long-Duration Insurance [Roll Forward]
Balance, beginning of period	22,836,765	16,432,032
Deposits	3,752,999	2,225,558
Interest credited	207,176	131,119
Policy charges	(12,007)	(10,684)
Surrenders and withdrawals	(370,351)	(233,470)
Benefit payments	(12,688)	(15,067)
Transfer to (from) Policyholder Account Balance (to) from Separate Account	41,403	4,995
Change in market value and other adjustments	1,092,901	954,563
Balance, end of period	27,536,198	19,489,046
Total Policyholders' account balance	$ 2,719,828	$ 3,081,376
Weighted-average crediting rate	1.65%	1.46%
Net amount at risk	$ 0	$ 0
Cash surrender value	25,912,600	17,391,104
Variable/Universal Life
Additional Liability, Long-Duration Insurance [Roll Forward]
Balance, beginning of period	20,167,713	18,736,365
Deposits	1,062,220	1,030,843
Interest credited	279,382	278,886
Policy charges	(910,191)	(903,228)
Surrenders and withdrawals	(376,600)	(400,194)
Benefit payments	(33,912)	(42,131)
Transfer to (from) Policyholder Account Balance (to) from Separate Account	169,366	1,035,554
Change in market value and other adjustments	65,431	139,608
Balance, end of period	20,423,409	19,875,703
Total Policyholders' account balance	$ 17,484,330	$ 17,506,563
Weighted-average crediting rate	2.75%	2.89%
Net amount at risk	$ 332,247,799	$ 313,218,977
Cash surrender value	19,133,660	$ 18,341,323
Fixed Annuity Netting
Additional Liability, Long-Duration Insurance [Roll Forward]
Policy charges	$ (87)