Policy Liabilities - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022	Dec. 31, 2021
Health
Liability for Future Policy Benefit, Activity [Line Items]
Policyholder benefits net of remeasurement gain (loss)	$ 5,000	$ 3,800	$ 5,600	$ 0
Effect of actual variances from expected experience					$ (28,000)	$ (99,098)	$ (19,801)	$ (106,381)
PV of expected future gross premiums	10,603,159	10,669,395	10,603,159	10,669,395
PV of expected future net premiums	5,346,643	5,510,459	5,346,643	5,510,459	5,374,493	5,207,422	5,908,639	6,418,018
Life
Liability for Future Policy Benefit, Activity [Line Items]
Effect of actual variances from expected experience					(133,457)	(223,880)	(91,081)	(118,057)
PV of expected future gross premiums	27,938,263	28,297,604	27,938,263	28,297,604
PV of expected future net premiums	12,042,720	12,129,478	12,042,720	12,129,478	$ 12,189,326	$ 11,748,528	$ 13,094,222	$ 14,082,538
Mortality | Health
Liability for Future Policy Benefit, Activity [Line Items]
Effect of actual variances from expected experience	5,100	(4,100)	5,100	(4,100)
Morbidity | Health
Liability for Future Policy Benefit, Activity [Line Items]
Effect of actual variances from expected experience	$ 500	$ 4,000	$ 500	$ 4,000