Policy Liabilities - Schedule of Undiscounted And Discounted Expected Future Gross Premiums And Expected Future Benefits And Expenses (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Life
Liability for Future Policy Benefit, Activity [Line Items]
PV of expected future gross premiums, Not discounted	$ 50,158,449	$ 48,220,609	$ 46,726,460
PV of expected future gross premiums, At original discount rates	27,455,738	26,406,710	25,482,752
PV of expected future gross premiums, At current discount rates	28,899,367	27,077,677	32,900,586
PV of expected future net premiums, Not discounted	21,584,244	21,057,389	20,110,979
PV of expected future net premiums, At original discount rates	11,709,368	11,442,919	10,896,222	$ 9,587,929
PV of expected future net premiums, At current discount rates	12,342,307	11,748,528	14,082,538	13,425,359
PV of expected future policy benefits, Not discounted	77,685,477	74,660,927	71,645,121
PV of expected future policy benefits, At original discount rates	24,563,696	23,564,337	22,374,930	20,550,299
PV of expected future policy benefits, At current discount rates	27,723,158	25,749,961	33,664,308	33,472,903
Health
Liability for Future Policy Benefit, Activity [Line Items]
PV of expected future gross premiums, Not discounted	19,516,632	17,330,117	16,625,970
PV of expected future gross premiums, At original discount rates	11,744,155	10,585,274	10,187,102
PV of expected future gross premiums, At current discount rates	11,834,715	10,334,511	12,354,670
PV of expected future net premiums, Not discounted	10,005,242	8,675,406	8,607,586
PV of expected future net premiums, At original discount rates	6,069,295	5,366,305	5,328,427	4,792,419
PV of expected future net premiums, At current discount rates	6,089,728	5,207,422	6,418,018	6,240,414
PV of expected future policy benefits, Not discounted	15,020,883	13,507,844	13,288,137
PV of expected future policy benefits, At original discount rates	8,484,970	7,710,767	7,587,083	6,951,288
PV of expected future policy benefits, At current discount rates	8,441,002	7,394,349	9,353,001	9,257,550
American Income | Life
Liability for Future Policy Benefit, Activity [Line Items]
PV of expected future gross premiums, Not discounted	24,265,464	22,662,540	21,317,703
PV of expected future gross premiums, At original discount rates	13,695,495	12,832,811	12,034,708
PV of expected future gross premiums, At current discount rates	14,264,077	13,006,579	15,278,295
PV of expected future net premiums, Not discounted	8,001,107	7,480,182	6,896,793
PV of expected future net premiums, At original discount rates	4,523,329	4,246,723	3,906,098	3,263,663
PV of expected future net premiums, At current discount rates	4,681,888	4,273,156	4,925,192	4,498,278
PV of expected future policy benefits, Not discounted	30,623,947	28,318,683	26,284,945
PV of expected future policy benefits, At original discount rates	9,061,833	8,409,761	7,744,201	6,805,088
PV of expected future policy benefits, At current discount rates	10,163,627	9,119,104	11,773,519	11,374,299
American Income | Health
Liability for Future Policy Benefit, Activity [Line Items]
PV of expected future gross premiums, Not discounted	1,768,231	1,750,393	1,698,676
PV of expected future gross premiums, At original discount rates	991,448	977,846	946,772
PV of expected future gross premiums, At current discount rates	1,047,348	1,004,239	1,218,899
PV of expected future net premiums, Not discounted	359,248	342,659	316,084
PV of expected future net premiums, At original discount rates	201,869	192,631	178,801	150,095
PV of expected future net premiums, At current discount rates	206,381	190,296	222,553	205,601
PV of expected future policy benefits, Not discounted	640,326	617,973	586,799
PV of expected future policy benefits, At original discount rates	315,431	303,713	285,604	252,092
PV of expected future policy benefits, At current discount rates	335,504	312,750	380,915	367,965
Direct to Consumer | Life
Liability for Future Policy Benefit, Activity [Line Items]
PV of expected future gross premiums, Not discounted	17,506,091	17,346,469	17,247,115
PV of expected future gross premiums, At original discount rates	9,150,049	9,086,945	9,023,170
PV of expected future gross premiums, At current discount rates	9,761,706	9,432,882	11,852,808
PV of expected future net premiums, Not discounted	10,774,655	10,769,174	10,500,169
PV of expected future net premiums, At original discount rates	5,664,259	5,680,864	5,533,741	4,963,806
PV of expected future net premiums, At current discount rates	6,052,651	5,910,224	7,264,905	7,028,713
PV of expected future policy benefits, Not discounted	25,723,752	25,356,573	24,612,198
PV of expected future policy benefits, At original discount rates	8,656,752	8,477,892	8,157,259	7,472,930
PV of expected future policy benefits, At current discount rates	9,714,516	9,225,451	11,859,408	11,733,268
Direct to Consumer | Health
Liability for Future Policy Benefit, Activity [Line Items]
PV of expected future gross premiums, Not discounted	236,776	177,131	206,986
PV of expected future gross premiums, At original discount rates	149,119	116,212	131,858
PV of expected future gross premiums, At current discount rates	156,612	119,457	165,674
PV of expected future net premiums, Not discounted	174,738	133,995	152,336
PV of expected future net premiums, At original discount rates	109,880	87,751	96,776	100,380
PV of expected future net premiums, At current discount rates	115,363	90,143	121,724	133,832
PV of expected future policy benefits, Not discounted	163,087	127,911	148,843
PV of expected future policy benefits, At original discount rates	104,501	85,212	95,628	101,632
PV of expected future policy benefits, At current discount rates	109,482	87,532	119,888	134,967
Liberty National | Life
Liability for Future Policy Benefit, Activity [Line Items]
PV of expected future gross premiums, Not discounted	4,660,783	4,396,685	4,239,223
PV of expected future gross premiums, At original discount rates	2,720,264	2,561,304	2,468,402
PV of expected future gross premiums, At current discount rates	2,784,916	2,562,342	3,076,801
PV of expected future net premiums, Not discounted	1,897,696	1,885,533	1,850,891
PV of expected future net premiums, At original discount rates	1,077,831	1,066,123	1,040,242	967,173
PV of expected future net premiums, At current discount rates	1,129,716	1,094,407	1,332,469	1,327,203
PV of expected future policy benefits, Not discounted	8,905,815	8,613,975	8,499,589
PV of expected future policy benefits, At original discount rates	3,338,252	3,272,980	3,206,164	3,120,435
PV of expected future policy benefits, At current discount rates	3,605,392	3,429,256	4,542,697	4,710,075
Liberty National | Health
Liability for Future Policy Benefit, Activity [Line Items]
PV of expected future gross premiums, Not discounted	2,089,005	2,271,423	2,209,171
PV of expected future gross premiums, At original discount rates	1,325,869	1,418,333	1,378,848
PV of expected future gross premiums, At current discount rates	1,390,066	1,458,880	1,732,660
PV of expected future net premiums, Not discounted	518,008	652,858	661,269
PV of expected future net premiums, At original discount rates	348,570	415,442	414,409	430,962
PV of expected future net premiums, At current discount rates	358,472	423,490	517,368	578,518
PV of expected future policy benefits, Not discounted	1,413,211	1,600,943	1,620,379
PV of expected future policy benefits, At original discount rates	816,819	904,865	921,608	953,238
PV of expected future policy benefits, At current discount rates	865,808	941,574	1,201,317	1,320,597
Other premium | Life
Liability for Future Policy Benefit, Activity [Line Items]
PV of expected future gross premiums, Not discounted	3,726,111	3,814,915	3,922,419
PV of expected future gross premiums, At original discount rates	1,889,930	1,925,650	1,956,472
PV of expected future gross premiums, At current discount rates	2,088,668	2,075,874	2,692,682
PV of expected future net premiums, Not discounted	910,786	922,500	863,126
PV of expected future net premiums, At original discount rates	443,949	449,209	416,141	393,287
PV of expected future net premiums, At current discount rates	478,052	470,741	559,972	571,165
PV of expected future policy benefits, Not discounted	12,431,963	12,371,696	12,248,389
PV of expected future policy benefits, At original discount rates	3,506,859	3,403,704	3,267,306	3,151,846
PV of expected future policy benefits, At current discount rates	4,239,623	3,976,150	5,488,684	5,655,261
United American | Health
Liability for Future Policy Benefit, Activity [Line Items]
PV of expected future gross premiums, Not discounted	8,682,707	6,801,987	6,694,635
PV of expected future gross premiums, At original discount rates	5,295,148	4,285,863	4,198,446
PV of expected future gross premiums, At current discount rates	5,396,402	4,233,647	5,136,704
PV of expected future net premiums, Not discounted	5,955,294	4,680,560	4,719,914
PV of expected future net premiums, At original discount rates	3,625,803	2,941,262	2,949,851	2,573,470
PV of expected future net premiums, At current discount rates	3,697,771	2,908,501	3,611,659	3,432,493
PV of expected future policy benefits, Not discounted	6,148,565	4,915,174	5,015,967
PV of expected future policy benefits, At original discount rates	3,741,530	3,080,633	3,090,901	2,715,869
PV of expected future policy benefits, At current discount rates	3,814,328	3,046,829	3,810,559	3,651,359
Family Heritage | Health
Liability for Future Policy Benefit, Activity [Line Items]
PV of expected future gross premiums, Not discounted	6,739,913	6,329,183	5,816,502
PV of expected future gross premiums, At original discount rates	3,982,571	3,787,020	3,531,178
PV of expected future gross premiums, At current discount rates	3,844,287	3,518,288	4,100,733
PV of expected future net premiums, Not discounted	2,997,954	2,865,334	2,757,983
PV of expected future net premiums, At original discount rates	1,783,173	1,729,219	1,688,590	1,537,512
PV of expected future net premiums, At current discount rates	1,711,741	1,594,992	1,944,714	1,889,970
PV of expected future policy benefits, Not discounted	6,655,694	6,245,843	5,916,149
PV of expected future policy benefits, At original discount rates	3,506,689	3,336,344	3,193,342	2,928,457
PV of expected future policy benefits, At current discount rates	$ 3,315,880	$ 3,005,664	$ 3,840,322	$ 3,782,662