Business Segments - Liabilities by Segment (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Segment Reporting, Other Significant Reconciling Item [Line Items]
Future policy benefits	$ 16,721,846	$ 16,034,727
Unearned and advance premiums	60,742	65,472
Policy claims and other benefits payable	430,027	412,940
Debt	2,077,055	2,026,138
Other	1,351,628	2,585,965
Total	20,641,298	21,125,242
Corporate & Other
Segment Reporting, Other Significant Reconciling Item [Line Items]
Future policy benefits	0	0
Unearned and advance premiums	0	0
Policy claims and other benefits payable	0	0
Debt	0	0
Other	1,328,628	2,585,965
Total	1,328,628	2,585,965
Life | Operating Segments
Segment Reporting, Other Significant Reconciling Item [Line Items]
Future policy benefits	13,320,773	12,686,851
Unearned and advance premiums	18,830	19,874
Policy claims and other benefits payable	251,506	245,108
Debt	0	0
Other	0	0
Total	13,591,109	12,951,833
Health | Operating Segments
Segment Reporting, Other Significant Reconciling Item [Line Items]
Future policy benefits	2,447,605	2,315,507
Unearned and advance premiums	41,912	45,598
Policy claims and other benefits payable	178,521	167,832
Debt	0	0
Other	0	0
Total	2,668,038	2,528,937
Annuity | Operating Segments
Segment Reporting, Other Significant Reconciling Item [Line Items]
Future policy benefits	953,468	1,032,369
Unearned and advance premiums	0	0
Policy claims and other benefits payable	0	0
Debt	0	0
Other	0	0
Total	953,468	1,032,369
Investment | Operating Segments
Segment Reporting, Other Significant Reconciling Item [Line Items]
Future policy benefits	0	0
Unearned and advance premiums	0	0
Policy claims and other benefits payable	0	0
Debt	2,077,055	2,026,138
Other	23,000	0
Total	$ 2,100,055	$ 2,026,138