Reinsurance (Reinsurance Recoverable by Counterparty) (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Effects of Reinsurance [Line Items]
Total reinsurance recoverables	$ 35,398,214	$ 38,598,767
PAR U
Effects of Reinsurance [Line Items]
Total reinsurance recoverables	13,012,849	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	5,726,187	5,830,441
PARCC
Effects of Reinsurance [Line Items]
Total reinsurance recoverables	2,252,763	2,371,491
GUL Re
Effects of Reinsurance [Line Items]
Total reinsurance recoverables	2,610,043	2,710,926
PAR Term
Effects of Reinsurance [Line Items]
Total reinsurance recoverables	1,976,071	1,972,339
Prudential Insurance
Effects of Reinsurance [Line Items]
Total reinsurance recoverables	1,252,406	2,082,551
Term Re
Effects of Reinsurance [Line Items]
Total reinsurance recoverables	2,032,964	1,953,063
Lotus Re
Effects of Reinsurance [Line Items]
Total reinsurance recoverables	2,083,169	32,039
DART
Effects of Reinsurance [Line Items]
Total reinsurance recoverables	730,897	644,101
Unaffiliated
Effects of Reinsurance [Line Items]
Total reinsurance recoverables	$ 3,720,865	$ 279,480