Significant Accounting Policies -Schedule of Liability for Future Policy Benefits, Nonparticipating Traditional Life (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Jan. 01, 2021	Dec. 31, 2020
Significant Of Accounting Policies [Line Items]
Net liability for future policy benefits—long duration health	$ 19,460,353	$ 18,097,341	$ 24,499,640	$ 25,074,108	$ 15,242,641
Life
Significant Of Accounting Policies [Line Items]
Effect of change from original to current discount rates	3,159,462	2,185,624	11,289,378		9,085,176
Effect of capping and flooring					19,334
Net liability for future policy benefits—long duration health	15,390,289	14,014,147	19,585,183	20,047,549	10,943,039
Reinsurance recoverable				(60,322)
Health
Significant Of Accounting Policies [Line Items]
Effect of change from original to current discount rates	(43,968)	(316,418)	1,765,918		906,651
Effect of capping and flooring					30,023
Net liability for future policy benefits—long duration health	2,379,415	2,203,789	2,942,663	3,018,160	2,081,486
Reinsurance recoverable				(19,529)
As Previously Reported | Life
Significant Of Accounting Policies [Line Items]
Liability for future policy benefit, at original discount rate				19,987,227	10,943,039
As Previously Reported | Health
Significant Of Accounting Policies [Line Items]
Liability for future policy benefit, at original discount rate				2,998,631	2,081,486
American Income | Life
Significant Of Accounting Policies [Line Items]
Effect of change from original to current discount rates	1,101,794	709,343	4,029,318		3,334,600
Effect of capping and flooring					0
Net liability for future policy benefits—long duration health	5,482,036	4,846,063	6,848,483	6,876,026
Reinsurance recoverable				(109)
American Income | Health
Significant Of Accounting Policies [Line Items]
Effect of change from original to current discount rates	20,073	9,037	95,311		60,366
Effect of capping and flooring					0
Net liability for future policy benefits—long duration health	129,980	122,502	158,389	162,364
Reinsurance recoverable				0
American Income | As Previously Reported | Life
Significant Of Accounting Policies [Line Items]
Liability for future policy benefit, at original discount rate				6,875,917	3,541,426
American Income | As Previously Reported | Health
Significant Of Accounting Policies [Line Items]
Liability for future policy benefit, at original discount rate				162,364	101,998
Direct to Consumer | Life
Significant Of Accounting Policies [Line Items]
Effect of change from original to current discount rates	1,057,764	747,559	3,702,149		2,195,430
Effect of capping and flooring					16,899
Net liability for future policy benefits—long duration health	3,665,180	3,320,140	4,597,014	4,704,555
Reinsurance recoverable				0
Direct to Consumer | Health
Significant Of Accounting Policies [Line Items]
Effect of change from original to current discount rates	4,981	2,320	24,260		318
Effect of capping and flooring					4,193
Net liability for future policy benefits—long duration health	772	1,023	1,339	1,598
Reinsurance recoverable				0
Direct to Consumer | As Previously Reported | Life
Significant Of Accounting Policies [Line Items]
Liability for future policy benefit, at original discount rate				4,704,555	2,492,226
Direct to Consumer | As Previously Reported | Health
Significant Of Accounting Policies [Line Items]
Liability for future policy benefit, at original discount rate				1,598	(2,913)
Liberty National | Life
Significant Of Accounting Policies [Line Items]
Effect of change from original to current discount rates	267,140	156,276	1,336,533		1,229,610
Effect of capping and flooring					2,433
Net liability for future policy benefits—long duration health	2,481,440	2,342,487	3,210,902	3,382,872
Reinsurance recoverable				(10,758)
Liberty National | Health
Significant Of Accounting Policies [Line Items]
Effect of change from original to current discount rates	48,989	36,709	279,709		220,313
Effect of capping and flooring					19,324
Net liability for future policy benefits—long duration health	516,903	524,037	686,701	742,589
Reinsurance recoverable				(1,961)
Liberty National | As Previously Reported | Life
Significant Of Accounting Policies [Line Items]
Liability for future policy benefit, at original discount rate				3,372,114	2,150,829
Liberty National | As Previously Reported | Health
Significant Of Accounting Policies [Line Items]
Liability for future policy benefit, at original discount rate				740,628	502,952
Other | Life
Significant Of Accounting Policies [Line Items]
Effect of change from original to current discount rates					2,325,536
Effect of capping and flooring					2
Net liability for future policy benefits—long duration health				5,084,096
Reinsurance recoverable				(49,455)
Other | As Previously Reported | Life
Significant Of Accounting Policies [Line Items]
Liability for future policy benefit, at original discount rate				5,034,641	2,758,558
United American | Health
Significant Of Accounting Policies [Line Items]
Effect of change from original to current discount rates	72,798	(33,804)	719,658		123,906
Effect of capping and flooring					6,506
Net liability for future policy benefits—long duration health	127,537	142,383	200,583	218,917
Reinsurance recoverable				(5,254)
United American | As Previously Reported | Health
Significant Of Accounting Policies [Line Items]
Liability for future policy benefit, at original discount rate				213,663	88,505
Family Heritage | Health
Significant Of Accounting Policies [Line Items]
Effect of change from original to current discount rates	(190,809)	(330,680)	646,980		501,748
Effect of capping and flooring					0
Net liability for future policy benefits—long duration health	$ 1,604,223	$ 1,413,844	$ 1,895,651	1,892,692
Reinsurance recoverable				(12,314)
Family Heritage | As Previously Reported | Health
Significant Of Accounting Policies [Line Items]
Liability for future policy benefit, at original discount rate				$ 1,880,378	$ 1,390,944