Liability For Future Policy Benefits (Benefit Reserves) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023	Dec. 31, 2022
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Other adjustments	$ 6,174	$ 1,133	$ 18,179	$ 5,535
Balance, end of period	17,917,864	18,190,646	17,917,864	18,190,646
Interest accrual			261,019	237,869
Other Businesses
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Balance, end of period	1,633	1,941	1,633	1,941
Nonparticipating Traditional And Limited-Pay Business
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Gain in net income			(22,000)	30,000
Loss in net income			21,000	30,000
Term Life
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]
Balance, beginning of period			10,927,833	10,911,794
Effect of cumulative changes in discount rate assumptions, beginning of period			225,711	554,896
Balance at original discount rate, beginning of period			11,153,544	11,466,690
Effect of assumption update					$ 21,466	$ (790)
Effect of actual variances from expected experience and other activity					(127,507)	(65,230)
Adjusted balance, beginning of period			11,047,503	11,400,670
Issuances			403,742	318,867
Net premiums / considerations collected			(661,611)	(674,147)
Interest accrual			254,945	261,862
Other adjustments			(78)
Balance at original discount rate, end of period	11,044,501	11,307,252	11,044,501	11,307,252
Effect of cumulative changes in discount rate assumptions, end of period	(577,768)	(484,287)	(577,768)	(484,287)
Balance, end of period	10,466,733	10,822,965	10,466,733	10,822,965
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Balance, beginning of period			18,426,207	17,835,251
Effect of cumulative changes in discount rate assumptions, beginning of period			331,571	962,034
Balance at original discount rate, beginning of period			18,757,778	18,797,285
Effect of assumption update					21,480	(1,044)
Effect of actual variances from expected experience and other activity					(153,025)	(87,110)
Adjusted balance, beginning of period			18,626,233	18,709,131
Issuances			403,742	318,867
Interest accrual			444,536	447,387
Benefit payments			(721,798)	(716,919)
Other adjustments			1,103	1,558
Balance at original discount rate, end of period	18,753,816	18,760,024	18,753,816	18,760,024
Effect of cumulative changes in discount rate assumptions, end of period	(1,064,363)	(791,413)	(1,064,363)	(791,413)
Balance, end of period	17,689,453	17,968,611	17,689,453	17,968,611
Balance, end of period, pre-flooring	7,222,720	7,145,646	7,222,720	7,145,646
Flooring impact, end of period	44	0	44	0
Balance, end of period, post flooring	7,222,764	7,145,646	7,222,764	7,145,646
Reinsurance recoverable	6,518,048	6,614,071	6,518,048	6,614,071
Balance after reinsurance recoverables, end of period, post-flooring	704,716	531,575	704,716	531,575
Term Life | Gross Basis
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Undiscounted expected future gross premiums	21,795,982	21,948,491	21,795,982	21,948,491
Discounted expected future gross premiums (at original discount rate)	14,920,888	15,125,847	14,920,888	15,125,847
Discounted expected future gross premiums (at current discount rate)	14,173,894	14,493,623	14,173,894	14,493,623
Undiscounted expected future benefits and expenses	$ 29,155,998	$ 29,156,389	29,155,998	29,156,389
Interest accrual			189,591	185,524
Gross Premiums			$ 901,158	$ 900,634
Weighted-average duration of the liability in years (at original discount rate)	10 years	10 years	10 years	10 years
Weighted-average duration of the liability in years (at current discount rate)	9 years	10 years	9 years	10 years
Weighted-average interest rate (at original discount rate)	5.15%	5.20%	5.15%	5.20%
Weighted-average interest rate (at current discount rate)	5.53%	5.28%	5.53%	5.28%
Fixed Annuities
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]
Balance, beginning of period			$ 0	$ 0
Effect of cumulative changes in discount rate assumptions, beginning of period			0	0
Balance at original discount rate, beginning of period			0	0
Effect of assumption update					0	0
Effect of actual variances from expected experience and other activity					(380)	(1,257)
Issuances			18,328	23,211
Net premiums / considerations collected			(17,948)	(21,954)
Interest accrual			0	0
Other adjustments			0
Balance at original discount rate, end of period	$ 0	$ 0	0	0
Effect of cumulative changes in discount rate assumptions, end of period	0	0	0	0
Balance, end of period	0	0	0	0
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Balance, beginning of period			228,788	204,727
Effect of cumulative changes in discount rate assumptions, beginning of period			19,521	24,876
Balance at original discount rate, beginning of period			248,309	229,603
Effect of assumption update					(3,643)	0
Effect of actual variances from expected experience and other activity					(130)	4,195
Adjusted balance, beginning of period			244,536	233,798
Issuances			18,328	23,211
Interest accrual			4,453	4,201
Benefit payments			(15,519)	(14,838)
Other adjustments			(150)	(33)
Balance at original discount rate, end of period	251,648	246,339	251,648	246,339
Effect of cumulative changes in discount rate assumptions, end of period	(24,870)	(26,245)	(24,870)	(26,245)
Balance, end of period	226,778	220,094	226,778	220,094
Balance, end of period, pre-flooring	226,778	220,094	226,778	220,094
Flooring impact, end of period	0	0	0	0
Balance, end of period, post flooring	226,778	220,094	226,778	220,094
Reinsurance recoverable	18,453	17,835	18,453	17,835
Balance after reinsurance recoverables, end of period, post-flooring	208,325	202,259	208,325	202,259
Fixed Annuities | Gross Basis
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Undiscounted expected future gross premiums	0	0	0	0
Discounted expected future gross premiums (at original discount rate)	0	0	0	0
Discounted expected future gross premiums (at current discount rate)	0	0	0	0
Undiscounted expected future benefits and expenses	$ 337,236	$ 328,414	337,236	328,414
Interest accrual			4,453	4,201
Gross Premiums			$ 21,461	$ 24,200
Weighted-average duration of the liability in years (at original discount rate)	7 years	7 years	7 years	7 years
Weighted-average duration of the liability in years (at current discount rate)	6 years	6 years	6 years	6 years
Weighted-average interest rate (at original discount rate)	3.83%	3.57%	3.83%	3.57%
Weighted-average interest rate (at current discount rate)	5.47%	5.27%	5.47%	5.27%
Fixed Annuity Netting
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]
Adjusted balance, beginning of period			$ (380)	$ (1,257)
Term Life And Fixed Annuities
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]
Balance, beginning of period			10,927,833	10,911,794
Effect of cumulative changes in discount rate assumptions, beginning of period			225,711	554,896
Balance at original discount rate, beginning of period			11,153,544	11,466,690
Effect of assumption update					21,466	(790)
Effect of actual variances from expected experience and other activity					(127,887)	(66,487)
Adjusted balance, beginning of period			11,047,123	11,399,413
Issuances			422,070	342,078
Net premiums / considerations collected			(679,559)	(696,101)
Interest accrual			254,945	261,862
Other adjustments			(78)
Balance at original discount rate, end of period	$ 11,044,501	$ 11,307,252	11,044,501	11,307,252
Effect of cumulative changes in discount rate assumptions, end of period	(577,768)	(484,287)	(577,768)	(484,287)
Balance, end of period	10,466,733	10,822,965	10,466,733	10,822,965
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Balance, end of period, pre-flooring	7,449,498	7,365,740	7,449,498	7,365,740
Flooring impact, end of period	44	0	44	0
Balance, end of period, post flooring	7,449,542	7,365,740	7,449,542	7,365,740
Reinsurance recoverable	6,536,501	6,631,906	6,536,501	6,631,906
Balance after reinsurance recoverables, end of period, post-flooring	913,041	733,834	913,041	733,834
Term Life And Fixed Annuities | Total
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Balance, beginning of period			18,654,995	18,039,978
Effect of cumulative changes in discount rate assumptions, beginning of period			351,092	986,910
Balance at original discount rate, beginning of period			19,006,087	19,026,888
Effect of assumption update					17,837	(1,044)
Effect of actual variances from expected experience and other activity					$ (153,155)	$ (82,915)
Adjusted balance, beginning of period			18,870,769	18,942,929
Issuances			422,070	342,078
Interest accrual			448,989	451,588
Benefit payments			(737,317)	(731,757)
Other adjustments			953	1,525
Balance at original discount rate, end of period	19,005,464	19,006,363	19,005,464	19,006,363
Effect of cumulative changes in discount rate assumptions, end of period	(1,089,233)	(817,658)	(1,089,233)	(817,658)
Balance, end of period	$ 17,916,231	$ 18,188,705	$ 17,916,231	$ 18,188,705