Reinsurance (Reinsurance Recoverable by Counterparty) (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Effects of Reinsurance [Line Items]
Total reinsurance recoverables	$ 34,561,825	$ 38,598,767
PAR U
Effects of Reinsurance [Line Items]
Total reinsurance recoverables	13,365,780	13,523,832
PALAC
Effects of Reinsurance [Line Items]
Total reinsurance recoverables	0	7,198,504
PURC
Effects of Reinsurance [Line Items]
Total reinsurance recoverables	5,921,664	5,830,441
PARCC
Effects of Reinsurance [Line Items]
Total reinsurance recoverables	2,211,803	2,371,491
GUL Re
Effects of Reinsurance [Line Items]
Total reinsurance recoverables	2,709,538	2,710,926
PAR Term
Effects of Reinsurance [Line Items]
Total reinsurance recoverables	2,043,970	1,972,339
Prudential Insurance
Effects of Reinsurance [Line Items]
Total reinsurance recoverables	1,263,411	2,082,551
Term Re
Effects of Reinsurance [Line Items]
Total reinsurance recoverables	2,054,090	1,953,063
Lotus Re
Effects of Reinsurance [Line Items]
Total reinsurance recoverables	2,015,687	32,039
DART
Effects of Reinsurance [Line Items]
Total reinsurance recoverables	763,004	644,101
Unaffiliated activity
Effects of Reinsurance [Line Items]
Total reinsurance recoverables	$ 2,212,878	$ 279,480