Policy Liabilities - Schedule of Undiscounted And Discounted Expected Future Gross Premiums And Expected Future Benefits And Expenses (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Life
Liability for Future Policy Benefit, Activity [Line Items]
PV of expected future gross premiums, Not discounted	$ 51,329,931	$ 50,158,449	$ 48,220,609
PV of expected future gross premiums, At original discount rates	28,149,266	27,455,738	26,406,710
PV of expected future gross premiums, At current discount rates	28,448,310	28,899,367	27,077,677
PV of expected future net premiums, Not discounted	21,449,048	21,584,244	21,057,389
PV of expected future net premiums, At original discount rates	11,638,920	11,709,368	11,442,919	$ 10,896,222
PV of expected future net premiums, At current discount rates	11,757,317	12,342,307	11,748,528	14,082,538
PV of expected future policy benefits, Not discounted	79,213,296	77,685,477	74,660,927
PV of expected future policy benefits, At original discount rates	25,091,824	24,563,696	23,564,337	22,374,930
PV of expected future policy benefits, At current discount rates	26,334,284	27,723,158	25,749,961	33,664,308
Health
Liability for Future Policy Benefit, Activity [Line Items]
PV of expected future gross premiums, Not discounted	20,652,684	19,516,632	17,330,117
PV of expected future gross premiums, At original discount rates	12,408,312	11,744,155	10,585,274
PV of expected future gross premiums, At current discount rates	12,071,436	11,834,715	10,334,511
PV of expected future net premiums, Not discounted	10,740,051	10,005,242	8,675,406
PV of expected future net premiums, At original discount rates	6,512,063	6,069,295	5,366,305	5,328,427
PV of expected future net premiums, At current discount rates	6,314,148	6,089,728	5,207,422	6,418,018
PV of expected future policy benefits, Not discounted	16,050,185	15,020,883	13,507,844
PV of expected future policy benefits, At original discount rates	9,006,730	8,484,970	7,710,767	7,587,083
PV of expected future policy benefits, At current discount rates	8,586,253	8,441,002	7,394,349	9,353,001
American Income | Life
Liability for Future Policy Benefit, Activity [Line Items]
PV of expected future gross premiums, Not discounted	25,492,032	24,265,464	22,662,540
PV of expected future gross premiums, At original discount rates	14,410,088	13,695,495	12,832,811
PV of expected future gross premiums, At current discount rates	14,471,277	14,264,077	13,006,579
PV of expected future net premiums, Not discounted	8,233,110	8,001,107	7,480,182
PV of expected future net premiums, At original discount rates	4,656,710	4,523,329	4,246,723	3,906,098
PV of expected future net premiums, At current discount rates	4,645,917	4,681,888	4,273,156	4,925,192
PV of expected future policy benefits, Not discounted	31,831,310	30,623,947	28,318,683
PV of expected future policy benefits, At original discount rates	9,508,589	9,061,833	8,409,761	7,744,201
PV of expected future policy benefits, At current discount rates	9,870,692	10,163,627	9,119,104	11,773,519
American Income | Health
Liability for Future Policy Benefit, Activity [Line Items]
PV of expected future gross premiums, Not discounted	1,770,862	1,768,231	1,750,393
PV of expected future gross premiums, At original discount rates	992,641	991,448	977,846
PV of expected future gross premiums, At current discount rates	1,012,919	1,047,348	1,004,239
PV of expected future net premiums, Not discounted	400,512	359,248	342,659
PV of expected future net premiums, At original discount rates	225,141	201,869	192,631	178,801
PV of expected future net premiums, At current discount rates	223,247	206,381	190,296	222,553
PV of expected future policy benefits, Not discounted	709,637	640,326	617,973
PV of expected future policy benefits, At original discount rates	348,711	315,431	303,713	285,604
PV of expected future policy benefits, At current discount rates	355,303	335,504	312,750	380,915
Direct to Consumer | Life
Liability for Future Policy Benefit, Activity [Line Items]
PV of expected future gross premiums, Not discounted	17,372,446	17,506,091	17,346,469
PV of expected future gross premiums, At original discount rates	9,077,304	9,150,049	9,086,945
PV of expected future gross premiums, At current discount rates	9,258,880	9,761,706	9,432,882
PV of expected future net premiums, Not discounted	10,481,376	10,774,655	10,769,174
PV of expected future net premiums, At original discount rates	5,504,912	5,664,259	5,680,864	5,533,741
PV of expected future net premiums, At current discount rates	5,622,906	6,052,651	5,910,224	7,264,905
PV of expected future policy benefits, Not discounted	25,841,419	25,723,752	25,356,573
PV of expected future policy benefits, At original discount rates	8,660,948	8,656,752	8,477,892	8,157,259
PV of expected future policy benefits, At current discount rates	9,125,112	9,714,516	9,225,451	11,859,408
Direct to Consumer | Health
Liability for Future Policy Benefit, Activity [Line Items]
PV of expected future gross premiums, Not discounted	248,646	236,776	177,131
PV of expected future gross premiums, At original discount rates	157,812	149,119	116,212
PV of expected future gross premiums, At current discount rates	159,862	156,612	119,457
PV of expected future net premiums, Not discounted	208,577	174,738	133,995
PV of expected future net premiums, At original discount rates	131,919	109,880	87,751	96,776
PV of expected future net premiums, At current discount rates	133,377	115,363	90,143	121,724
PV of expected future policy benefits, Not discounted	204,099	163,087	127,911
PV of expected future policy benefits, At original discount rates	127,975	104,501	85,212	95,628
PV of expected future policy benefits, At current discount rates	129,277	109,482	87,532	119,888
Liberty National | Life
Liability for Future Policy Benefit, Activity [Line Items]
PV of expected future gross premiums, Not discounted	4,837,598	4,660,783	4,396,685
PV of expected future gross premiums, At original discount rates	2,817,204	2,720,264	2,561,304
PV of expected future gross premiums, At current discount rates	2,775,304	2,784,916	2,562,342
PV of expected future net premiums, Not discounted	1,849,200	1,897,696	1,885,533
PV of expected future net premiums, At original discount rates	1,047,022	1,077,831	1,066,123	1,040,242
PV of expected future net premiums, At current discount rates	1,048,447	1,129,716	1,094,407	1,332,469
PV of expected future policy benefits, Not discounted	9,073,624	8,905,815	8,613,975
PV of expected future policy benefits, At original discount rates	3,340,219	3,338,252	3,272,980	3,206,164
PV of expected future policy benefits, At current discount rates	3,377,517	3,605,392	3,429,256	4,542,697
Liberty National | Health
Liability for Future Policy Benefit, Activity [Line Items]
PV of expected future gross premiums, Not discounted	2,039,441	2,089,005	2,271,423
PV of expected future gross premiums, At original discount rates	1,299,234	1,325,869	1,418,333
PV of expected future gross premiums, At current discount rates	1,316,967	1,390,066	1,458,880
PV of expected future net premiums, Not discounted	500,297	518,008	652,858
PV of expected future net premiums, At original discount rates	338,275	348,570	415,442	414,409
PV of expected future net premiums, At current discount rates	337,119	358,472	423,490	517,368
PV of expected future policy benefits, Not discounted	1,374,959	1,413,211	1,600,943
PV of expected future policy benefits, At original discount rates	791,140	816,819	904,865	921,608
PV of expected future policy benefits, At current discount rates	804,695	865,808	941,574	1,201,317
Other premium | Life
Liability for Future Policy Benefit, Activity [Line Items]
PV of expected future gross premiums, Not discounted	3,627,855	3,726,111	3,814,915
PV of expected future gross premiums, At original discount rates	1,844,670	1,889,930	1,925,650
PV of expected future gross premiums, At current discount rates	1,942,849	2,088,668	2,075,874
PV of expected future net premiums, Not discounted	885,362	910,786	922,500
PV of expected future net premiums, At original discount rates	430,276	443,949	449,209	416,141
PV of expected future net premiums, At current discount rates	440,047	478,052	470,741	559,972
PV of expected future policy benefits, Not discounted	12,466,943	12,431,963	12,371,696
PV of expected future policy benefits, At original discount rates	3,582,068	3,506,859	3,403,704	3,267,306
PV of expected future policy benefits, At current discount rates	3,960,963	4,239,623	3,976,150	5,488,684
United American | Health
Liability for Future Policy Benefit, Activity [Line Items]
PV of expected future gross premiums, Not discounted	9,350,851	8,682,707	6,801,987
PV of expected future gross premiums, At original discount rates	5,738,332	5,295,148	4,285,863
PV of expected future gross premiums, At current discount rates	5,643,454	5,396,402	4,233,647
PV of expected future net premiums, Not discounted	6,442,648	5,955,294	4,680,560
PV of expected future net premiums, At original discount rates	3,948,855	3,625,803	2,941,262	2,949,851
PV of expected future net premiums, At current discount rates	3,885,530	3,697,771	2,908,501	3,611,659
PV of expected future policy benefits, Not discounted	6,584,800	6,148,565	4,915,174
PV of expected future policy benefits, At original discount rates	4,026,860	3,741,530	3,080,633	3,090,901
PV of expected future policy benefits, At current discount rates	3,960,432	3,814,328	3,046,829	3,810,559
Family Heritage | Health
Liability for Future Policy Benefit, Activity [Line Items]
PV of expected future gross premiums, Not discounted	7,242,884	6,739,913	6,329,183
PV of expected future gross premiums, At original discount rates	4,220,293	3,982,571	3,787,020
PV of expected future gross premiums, At current discount rates	3,938,234	3,844,287	3,518,288
PV of expected future net premiums, Not discounted	3,188,017	2,997,954	2,865,334
PV of expected future net premiums, At original discount rates	1,867,873	1,783,173	1,729,219	1,688,590
PV of expected future net premiums, At current discount rates	1,734,875	1,711,741	1,594,992	1,944,714
PV of expected future policy benefits, Not discounted	7,176,690	6,655,694	6,245,843
PV of expected future policy benefits, At original discount rates	3,712,044	3,506,689	3,336,344	3,193,342
PV of expected future policy benefits, At current discount rates	$ 3,336,546	$ 3,315,880	$ 3,005,664	$ 3,840,322