Related Party Transactions (Affiliated Asset Transfers) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Related Party Transaction [Line Items]
Realized investment (gains) losses, net	$ 3,129,136	$ (757,691)
Affiliated Entity | Prudential International Insurance Service Company March 2020 - Purchase
Related Party Transaction [Line Items]
Fair Value	107,014
Book Value	107,014
APIC, Net of Tax Increase/(Decrease)	0
Realized investment (gains) losses, net	0
Affiliated Entity | Prudential Insurance March 2020 Purchase
Related Party Transaction [Line Items]
Fair Value	258,885
Book Value	258,885
APIC, Net of Tax Increase/(Decrease)	0
Realized investment (gains) losses, net	0
Affiliated Entity | Prudential Insurance April 2020 Purchase
Related Party Transaction [Line Items]
Fair Value	91,131
Book Value	91,131
APIC, Net of Tax Increase/(Decrease)	0
Realized investment (gains) losses, net	0
Affiliated Entity | Prudential Insurance June 2020 Sale
Related Party Transaction [Line Items]
Fair Value	65,646
Book Value	57,699
APIC, Net of Tax Increase/(Decrease)	0
Realized investment (gains) losses, net	7,947
Affiliated Entity | Gibraltar life insurance company June 2020 Purchase
Related Party Transaction [Line Items]
Fair Value	222,091
Book Value	222,091
APIC, Net of Tax Increase/(Decrease)	0
Realized investment (gains) losses, net	$ 0