Liability For Future Policy Benefits (Benefit Reserves) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024	Dec. 31, 2023
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Other adjustments	$ 107,470	$ 6,174	$ 100,888	$ 18,179
Balance, end of period	17,931,807	17,917,864	17,931,807	17,917,864
Other Businesses
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Balance, end of period	1,499	1,633	1,499	1,633
Nonparticipating Traditional And Limited-Pay Business
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Gain in net income				(22,000)
Loss in net income				21,000
Term Life
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]
Balance, beginning of period			10,414,702	10,927,833
Effect of cumulative changes in discount rate assumptions, beginning of period			567,443	225,711
Balance at original discount rate, beginning of period			10,982,145	11,153,544
Effect of assumption update					$ (207,935)	$ 21,466
Effect of actual variances from expected experience and other activity					(93,680)	(127,507)
Adjusted balance, beginning of period			10,680,530	11,047,503
Issuances			391,473	403,742
Net premiums / considerations collected			(667,203)	(661,611)
Interest accrual			257,108	254,945
Other adjustments			(184)	(78)
Balance at original discount rate, end of period	10,661,724	11,044,501	10,661,724	11,044,501
Effect of cumulative changes in discount rate assumptions, end of period	(381,592)	(577,768)	(381,592)	(577,768)
Balance, end of period	10,280,132	10,466,733	10,280,132	10,466,733
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Balance, beginning of period			17,689,399	18,426,207
Effect of cumulative changes in discount rate assumptions, beginning of period			1,091,673	331,571
Balance at original discount rate, beginning of period			18,781,072	18,757,778
Effect of assumption update					(332,969)	21,480
Effect of actual variances from expected experience and other activity					(114,781)	(153,025)
Adjusted balance, beginning of period			18,333,322	18,626,233
Issuances			391,473	403,742
Interest accrual			447,398	444,536
Benefit payments			(725,946)	(721,798)
Other adjustments			2,324	1,103
Balance at original discount rate, end of period	18,448,571	18,753,816	18,448,571	18,753,816
Effect of cumulative changes in discount rate assumptions, end of period	(776,613)	(1,064,363)	(776,613)	(1,064,363)
Balance, end of period	17,671,958	17,689,453	17,671,958	17,689,453
Balance, end of period, pre-flooring	7,391,826	7,222,720	7,391,826	7,222,720
Flooring impact, end of period	44	44	44	44
Balance, end of period, post flooring	7,391,870	7,222,764	7,391,870	7,222,764
Reinsurance recoverable	6,748,033	6,518,048	6,748,033	6,518,048
Balance after reinsurance recoverables, end of period, post-flooring	643,837	704,716	643,837	704,716
Term Life | Gross Basis
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Undiscounted expected future gross premiums	21,856,366	21,795,982	21,856,366	21,795,982
Discounted expected future gross premiums (at original discount rate)	14,837,337	14,920,888	14,837,337	14,920,888
Discounted expected future gross premiums (at current discount rate)	14,350,506	14,173,894	14,350,506	14,173,894
Undiscounted expected future benefits and expenses	$ 28,650,712	$ 29,155,998	$ 28,650,712	$ 29,155,998
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	9 years	9 years	9 years
Weighted-average interest rate (at original discount rate)	5.12%	5.15%	5.12%	5.15%
Weighted-average interest rate (at current discount rate)	5.37%	5.53%	5.37%	5.53%
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					418	(380)
Adjusted balance, beginning of period			418
Issuances			21,601	18,328
Net premiums / considerations collected			(22,019)	(17,948)
Interest accrual			0	0
Other adjustments			0	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			238,086	228,788
Effect of cumulative changes in discount rate assumptions, beginning of period			19,442	19,521
Balance at original discount rate, beginning of period			257,528	248,309
Effect of assumption update					0	(3,643)
Effect of actual variances from expected experience and other activity					2,302	(130)
Adjusted balance, beginning of period			259,830	244,536
Issuances			21,601	18,328
Interest accrual			5,096	4,453
Benefit payments			(17,064)	(15,519)
Other adjustments			146	(150)
Balance at original discount rate, end of period	269,609	251,648	269,609	251,648
Effect of cumulative changes in discount rate assumptions, end of period	(11,259)	(24,870)	(11,259)	(24,870)
Balance, end of period	258,350	226,778	258,350	226,778
Balance, end of period, pre-flooring	258,350	226,778	258,350	226,778
Flooring impact, end of period	0	0	0	0
Balance, end of period, post flooring	258,350	226,778	258,350	226,778
Reinsurance recoverable	21,318	18,453	21,318	18,453
Balance after reinsurance recoverables, end of period, post-flooring	237,032	208,325	237,032	208,325
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	$ 365,428	$ 337,236	$ 365,428	$ 337,236
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)	4.08%	3.83%	4.08%	3.83%
Weighted-average interest rate (at current discount rate)	5.25%	5.47%	5.25%	5.47%
Fixed Annuity Netting
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]
Adjusted balance, beginning of period				$ (380)
Term Life And Fixed Annuities
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]
Balance, beginning of period			$ 10,414,702	10,927,833
Effect of cumulative changes in discount rate assumptions, beginning of period			567,443	225,711
Balance at original discount rate, beginning of period			10,982,145	11,153,544
Effect of assumption update					(207,935)	21,466
Effect of actual variances from expected experience and other activity					(93,262)	(127,887)
Adjusted balance, beginning of period			10,680,948	11,047,123
Issuances			413,074	422,070
Net premiums / considerations collected			(689,222)	(679,559)
Interest accrual			257,108	254,945
Other adjustments			(184)	(78)
Balance at original discount rate, end of period	$ 10,661,724	$ 11,044,501	10,661,724	11,044,501
Effect of cumulative changes in discount rate assumptions, end of period	(381,592)	(577,768)	(381,592)	(577,768)
Balance, end of period	10,280,132	10,466,733	10,280,132	10,466,733
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Balance, end of period, pre-flooring	7,650,176	7,449,498	7,650,176	7,449,498
Flooring impact, end of period	44	44	44	44
Balance, end of period, post flooring	7,650,220	7,449,542	7,650,220	7,449,542
Reinsurance recoverable	6,769,351	6,536,501	6,769,351	6,536,501
Balance after reinsurance recoverables, end of period, post-flooring	880,869	913,041	880,869	913,041
Term Life And Fixed Annuities | Total
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Balance, beginning of period			17,927,485	18,654,995
Effect of cumulative changes in discount rate assumptions, beginning of period			1,111,115	351,092
Balance at original discount rate, beginning of period			19,038,600	19,006,087
Effect of assumption update					(332,969)	17,837
Effect of actual variances from expected experience and other activity					$ (112,479)	$ (153,155)
Adjusted balance, beginning of period			18,593,152	18,870,769
Issuances			413,074	422,070
Interest accrual			452,494	448,989
Benefit payments			(743,010)	(737,317)
Other adjustments			2,470	953
Balance at original discount rate, end of period	18,718,180	19,005,464	18,718,180	19,005,464
Effect of cumulative changes in discount rate assumptions, end of period	(787,872)	(1,089,233)	(787,872)	(1,089,233)
Balance, end of period	$ 17,930,308	$ 17,916,231	$ 17,930,308	$ 17,916,231