Reinsurance (Reinsurance Recoverable by Counterparty) (Details) - USD ($) $ in Thousands	Jun. 30, 2020		Dec. 31, 2019
Effects of Reinsurance [Line Items]
Total reinsurance recoverables	$ 52,917,099	[1]	$ 40,710,159
PAR U
Effects of Reinsurance [Line Items]
Total reinsurance recoverables	12,952,267		12,380,683
PALAC
Effects of Reinsurance [Line Items]
Total reinsurance recoverables	21,096,307		11,635,405
PURC
Effects of Reinsurance [Line Items]
Total reinsurance recoverables	5,115,192		4,692,769
PARCC
Effects of Reinsurance [Line Items]
Total reinsurance recoverables	2,557,822		2,627,595
GUL Re
Effects of Reinsurance [Line Items]
Total reinsurance recoverables	2,449,345		2,292,638
PAR Term
Effects of Reinsurance [Line Items]
Total reinsurance recoverables	1,872,568		1,825,594
Prudential Insurance
Effects of Reinsurance [Line Items]
Total reinsurance recoverables	2,848,823		1,764,512
Prudential of Taiwan
Effects of Reinsurance [Line Items]
Total reinsurance recoverables	1,548,740		1,499,685
Term Re
Effects of Reinsurance [Line Items]
Total reinsurance recoverables	1,646,121		1,506,366
DART
Effects of Reinsurance [Line Items]
Total reinsurance recoverables	412,715		327,235
Unaffiliated
Effects of Reinsurance [Line Items]
Total reinsurance recoverables	$ 417,199		$ 157,677

[1] June 30, 2020 amounts include the impacts of the January 1, 2020 adoption of ASU 2016-13. See Note 2 for details.