Reinsurance (Reinsurance Recoverable by Counterparty) (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Effects of Reinsurance [Line Items]
Total reinsurance recoverables	$ 38,809,510	$ 38,598,767
PAR U
Effects of Reinsurance [Line Items]
Total reinsurance recoverables	13,365,163	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	5,760,428	5,830,441
PARCC
Effects of Reinsurance [Line Items]
Total reinsurance recoverables	2,282,435	2,371,491
GUL Re
Effects of Reinsurance [Line Items]
Total reinsurance recoverables	2,666,661	2,710,926
PAR Term
Effects of Reinsurance [Line Items]
Total reinsurance recoverables	1,998,500	1,972,339
Prudential Insurance
Effects of Reinsurance [Line Items]
Total reinsurance recoverables	1,378,191	2,082,551
Term Re
Effects of Reinsurance [Line Items]
Total reinsurance recoverables	2,006,812	1,953,063
Lotus Re
Effects of Reinsurance [Line Items]
Total reinsurance recoverables	1,986,321	32,039
DART
Effects of Reinsurance [Line Items]
Total reinsurance recoverables	708,366	644,101
Unaffiliated
Effects of Reinsurance [Line Items]
Total reinsurance recoverables	$ 6,656,633	$ 279,480