New Accounting Standards - Schedule of Liability for Future Policy Benefits, Nonparticipating Traditional Life (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022	Jan. 01, 2021	Dec. 31, 2020
Liability for Future Policy Benefit, Activity [Line Items]
Balance, net of reinsurance, at current discount rates as of January 1, 2021	$ 18,896,574	$ 18,040,042
Previously Reported
Liability for Future Policy Benefit, Activity [Line Items]
Balance, net of reinsurance, at current discount rates as of January 1, 2021		$ 16,721,846
Life
Liability for Future Policy Benefit, Activity [Line Items]
Effect of changes in discount rate assumptions	(3,138,215)		$ (7,620,695)		$ 9,057,475
Effect of capping and flooring					19,334
Balance, net of reinsurance, at current discount rates as of January 1, 2021	14,766,577		17,171,757	$ 19,987,227
Life | Previously Reported
Liability for Future Policy Benefit, Activity [Line Items]
Balance, net of reinsurance, at original discount rates as of December 31, 2020					10,910,418
Health
Liability for Future Policy Benefit, Activity [Line Items]
Effect of changes in discount rate assumptions	(77,607)		(908,149)		853,606
Effect of capping and flooring					30,023
Balance, net of reinsurance, at current discount rates as of January 1, 2021	2,297,512		2,610,248	2,998,631
Health | Previously Reported
Liability for Future Policy Benefit, Activity [Line Items]
Balance, net of reinsurance, at original discount rates as of December 31, 2020					2,115,002
American Income | Life
Liability for Future Policy Benefit, Activity [Line Items]
Effect of changes in discount rate assumptions	(1,063,729)		(2,692,562)		3,334,600
Effect of capping and flooring					0
Balance, net of reinsurance, at current discount rates as of January 1, 2021	5,169,780		6,005,498	6,875,917
American Income | Life | Previously Reported
Liability for Future Policy Benefit, Activity [Line Items]
Balance, net of reinsurance, at original discount rates as of December 31, 2020					3,541,317
American Income | Health
Liability for Future Policy Benefit, Activity [Line Items]
Effect of changes in discount rate assumptions	18,363		(59,275)		60,366
Effect of capping and flooring					0
Balance, net of reinsurance, at current discount rates as of January 1, 2021	126,200		143,579	162,364
American Income | Health | Previously Reported
Liability for Future Policy Benefit, Activity [Line Items]
Balance, net of reinsurance, at original discount rates as of December 31, 2020					101,998
DTC | Life
Liability for Future Policy Benefit, Activity [Line Items]
Effect of changes in discount rate assumptions	(1,061,076)		(2,511,848)		2,195,430
Effect of capping and flooring					16,899
Balance, net of reinsurance, at current discount rates as of January 1, 2021	3,518,676		4,042,514	4,704,555
DTC | Life | Previously Reported
Liability for Future Policy Benefit, Activity [Line Items]
Balance, net of reinsurance, at original discount rates as of December 31, 2020					2,492,226
DTC | Health
Liability for Future Policy Benefit, Activity [Line Items]
Effect of changes in discount rate assumptions	4,089		(14,762)		346
Effect of capping and flooring					4,193
Balance, net of reinsurance, at current discount rates as of January 1, 2021	1,009		1,112	1,598
DTC | Health | Previously Reported
Liability for Future Policy Benefit, Activity [Line Items]
Balance, net of reinsurance, at original discount rates as of December 31, 2020					(2,941)
Liberty National | Life
Liability for Future Policy Benefit, Activity [Line Items]
Effect of changes in discount rate assumptions	(274,418)		(858,179)		1,229,610
Effect of capping and flooring					2,433
Balance, net of reinsurance, at current discount rates as of January 1, 2021	2,431,415		2,830,800	3,372,114
Liberty National | Life | Previously Reported
Liability for Future Policy Benefit, Activity [Line Items]
Balance, net of reinsurance, at original discount rates as of December 31, 2020					2,140,071
Liberty National | Health
Liability for Future Policy Benefit, Activity [Line Items]
Effect of changes in discount rate assumptions	59,977		(176,686)		219,992
Effect of capping and flooring					19,324
Balance, net of reinsurance, at current discount rates as of January 1, 2021	532,897		620,481	740,628
Liberty National | Health | Previously Reported
Liability for Future Policy Benefit, Activity [Line Items]
Balance, net of reinsurance, at original discount rates as of December 31, 2020					501,312
Other | Life
Liability for Future Policy Benefit, Activity [Line Items]
Effect of changes in discount rate assumptions					2,297,835
Effect of capping and flooring					2
Balance, net of reinsurance, at current discount rates as of January 1, 2021				5,034,641
Other | Life | Previously Reported
Liability for Future Policy Benefit, Activity [Line Items]
Balance, net of reinsurance, at original discount rates as of December 31, 2020					2,736,804
United American | Health
Liability for Future Policy Benefit, Activity [Line Items]
Effect of changes in discount rate assumptions	52,672		(413,068)		75,652
Effect of capping and flooring					6,506
Balance, net of reinsurance, at current discount rates as of January 1, 2021	136,510		169,521	213,663
United American | Health | Previously Reported
Liability for Future Policy Benefit, Activity [Line Items]
Balance, net of reinsurance, at original discount rates as of December 31, 2020					131,505
Family Heritage | Health
Liability for Future Policy Benefit, Activity [Line Items]
Effect of changes in discount rate assumptions	(212,708)		(244,358)		497,250
Effect of capping and flooring					0
Balance, net of reinsurance, at current discount rates as of January 1, 2021	$ 1,500,896		$ 1,675,555	$ 1,880,378
Family Heritage | Health | Previously Reported
Liability for Future Policy Benefit, Activity [Line Items]
Balance, net of reinsurance, at original discount rates as of December 31, 2020					$ 1,383,128