Reinsurance (Reinsurance Recoverable by Counterparty) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Effects of Reinsurance [Line Items]
Total reinsurance recoverables	$ 38,598,767	$ 48,367,096
PAR U
Effects of Reinsurance [Line Items]
Total reinsurance recoverables	13,523,832	13,352,845
PALAC
Effects of Reinsurance [Line Items]
Total reinsurance recoverables	7,198,504	15,941,123
PURC
Effects of Reinsurance [Line Items]
Total reinsurance recoverables	5,830,441	5,368,831
PARCC
Effects of Reinsurance [Line Items]
Total reinsurance recoverables	2,371,491	2,572,428
GUL Re
Effects of Reinsurance [Line Items]
Total reinsurance recoverables	2,710,926	2,573,609
PAR Term
Effects of Reinsurance [Line Items]
Total reinsurance recoverables	1,972,339	1,913,265
Prudential Insurance
Effects of Reinsurance [Line Items]
Total reinsurance recoverables	2,082,551	2,421,226
Prudential of Taiwan
Effects of Reinsurance [Line Items]
Total reinsurance recoverables	0	1,649,998
Term Re
Effects of Reinsurance [Line Items]
Total reinsurance recoverables	1,953,063	1,766,978
DART
Effects of Reinsurance [Line Items]
Total reinsurance recoverables	644,101	502,770
Lotus Re
Effects of Reinsurance [Line Items]
Total reinsurance recoverables	32,039	0
Unaffiliated
Effects of Reinsurance [Line Items]
Total reinsurance recoverables	$ 279,480	$ 304,023