Reinsurance (Reinsurance Recoverable by Counterparty) (Details) - USD ($) $ in Thousands	Mar. 31, 2020		Dec. 31, 2019
Effects of Reinsurance [Line Items]
Total reinsurance recoverables	$ 53,163,489	[1]	$ 40,710,159
PAR U
Effects of Reinsurance [Line Items]
Total reinsurance recoverables	12,572,713		12,380,683
PALAC
Effects of Reinsurance [Line Items]
Total reinsurance recoverables	22,178,177		11,635,405
PURC
Effects of Reinsurance [Line Items]
Total reinsurance recoverables	4,847,038		4,692,769
PARCC
Effects of Reinsurance [Line Items]
Total reinsurance recoverables	2,623,469		2,627,595
GUL Re
Effects of Reinsurance [Line Items]
Total reinsurance recoverables	2,363,794		2,292,638
PAR Term
Effects of Reinsurance [Line Items]
Total reinsurance recoverables	1,841,572		1,825,594
Prudential Insurance
Effects of Reinsurance [Line Items]
Total reinsurance recoverables	2,881,886		1,764,512
Prudential of Taiwan
Effects of Reinsurance [Line Items]
Total reinsurance recoverables	1,498,116		1,499,685
Term Re
Effects of Reinsurance [Line Items]
Total reinsurance recoverables	1,563,370		1,506,366
DART
Effects of Reinsurance [Line Items]
Total reinsurance recoverables	370,267		327,235
Unaffiliated
Effects of Reinsurance [Line Items]
Total reinsurance recoverables	$ 423,087		$ 157,677

[1] March 31, 2020 amounts include the impacts of the January 1, 2020 adoption of ASU 2016-13. See Note 2 for details.