Related Party Transactions (Affiliated Asset Transfers) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Related Party Transaction [Line Items]
Realized investment gains (losses), net of tax	$ (2,681,320)	$ 884,073	$ (805,400)
Prudential Insurance February 2018 Purchase
Related Party Transaction [Line Items]
Fair Value	136,963
Book Value	136,963
APIC, Net of Tax Increase/ (Decrease)	0
Realized investment gains (losses), net of tax	0
Pruco Life Insurance Company of Arizona April 2018 Sale
Related Party Transaction [Line Items]
Fair Value	64,313
Book Value	64,514
APIC, Net of Tax Increase/ (Decrease)	0
Realized investment gains (losses), net of tax	(159)
Prudential Insurance April 2018 Sale
Related Party Transaction [Line Items]
Fair Value	57,747
Book Value	43,434
APIC, Net of Tax Increase/ (Decrease)	0
Realized investment gains (losses), net of tax	11,308
Prudential Insurance May 2018 Sale
Related Party Transaction [Line Items]
Fair Value	162,111
Book Value	159,237
APIC, Net of Tax Increase/ (Decrease)	0
Realized investment gains (losses), net of tax	2,271
Passaic Fund LLC June 2018 Transfer Out
Related Party Transaction [Line Items]
Fair Value	15,281
Book Value	15,281
APIC, Net of Tax Increase/ (Decrease)	0
Realized investment gains (losses), net of tax	0
Prudential Insurance July 2018 Sale
Related Party Transaction [Line Items]
Fair Value	11,160
Book Value	9,277
APIC, Net of Tax Increase/ (Decrease)	0
Realized investment gains (losses), net of tax	1,488
Prudential Insurance August 2018 Sale
Related Party Transaction [Line Items]
Fair Value	13,414
Book Value	13,165
APIC, Net of Tax Increase/ (Decrease)	0
Realized investment gains (losses), net of tax	196
Prudential Insurance December 2018 Purchase
Related Party Transaction [Line Items]
Fair Value	33,256
Book Value	33,166
APIC, Net of Tax Increase/ (Decrease)	0
Realized investment gains (losses), net of tax	(71)
Prudential Argicultural Investors LP December 2018 Transfer Out
Related Party Transaction [Line Items]
Fair Value	7,324
Book Value	7,324
APIC, Net of Tax Increase/ (Decrease)	0
Realized investment gains (losses), net of tax	0
Prudential Insurance January 2019 Sale FM
Related Party Transaction [Line Items]
Fair Value	20,504
Book Value	20,781
APIC, Net of Tax Increase/ (Decrease)	0
Realized investment gains (losses), net of tax	(277)
Prudential Insurance Feb 2019 Sale Commercial Mortgage
Related Party Transaction [Line Items]
Fair Value	97,953
Book Value	98,506
APIC, Net of Tax Increase/ (Decrease)	0
Realized investment gains (losses), net of tax	(554)
Prudential Insurance March 2019 Purchase FM
Related Party Transaction [Line Items]
Fair Value	141,476
Book Value	141,476
APIC, Net of Tax Increase/ (Decrease)	0
Realized investment gains (losses), net of tax	7,776
Prudential Insurance April 2019 Purchase Equity Securities
Related Party Transaction [Line Items]
Fair Value	4,300
Book Value	4,300
APIC, Net of Tax Increase/ (Decrease)	0
Realized investment gains (losses), net of tax	0
Prudential Retirement Insurance & Annuity Co April 2019 Purchase Equity Securities
Related Party Transaction [Line Items]
Fair Value	1,258
Book Value	1,258
APIC, Net of Tax Increase/ (Decrease)	0
Realized investment gains (losses), net of tax	0
Prudo Life Insurance Company April 2019 Purchase Equity Securities
Related Party Transaction [Line Items]
Fair Value	14,525
Book Value	14,525
APIC, Net of Tax Increase/ (Decrease)	0
Realized investment gains (losses), net of tax	0
Prudential Insurance June 2019 Transfer Out Fixed Maturities
Related Party Transaction [Line Items]
Fair Value	23,066
Book Value	23,002
APIC, Net of Tax Increase/ (Decrease)	0
Realized investment gains (losses), net of tax	64
Prudential Insurance June 2019 Transfer In Fixed Maturities
Related Party Transaction [Line Items]
Fair Value	19,919
Book Value	19,919
APIC, Net of Tax Increase/ (Decrease)	0
Realized investment gains (losses), net of tax	0
Prudential Insurance August 2019 Sale Fixed Maturities
Related Party Transaction [Line Items]
Fair Value	66,346
Book Value	64,735
APIC, Net of Tax Increase/ (Decrease)	0
Realized investment gains (losses), net of tax	1,611
Prudential Insurance August 2019 Sale Commercial Mortgages
Related Party Transaction [Line Items]
Fair Value	106,307
Book Value	104,733
APIC, Net of Tax Increase/ (Decrease)	0
Realized investment gains (losses), net of tax	1,574
Prudential Insurance November 2019 Sale Other Invested Assets
Related Party Transaction [Line Items]
Fair Value	2,289
Book Value	2,362
APIC, Net of Tax Increase/ (Decrease)	0
Realized investment gains (losses), net of tax	(73)
Prudential Insurance November 2019 Sale Fixed Maturity
Related Party Transaction [Line Items]
Fair Value	6,517
Book Value	8,550
APIC, Net of Tax Increase/ (Decrease)	0
Realized investment gains (losses), net of tax	(2,033)
Prudential Insurance December 2019 Purchase Fixed Maturity
Related Party Transaction [Line Items]
Fair Value	5,271
Book Value	5,271
APIC, Net of Tax Increase/ (Decrease)	0
Realized investment gains (losses), net of tax	0
Prudential Insurance December 2019 Purchase Fixed Maturity
Related Party Transaction [Line Items]
Fair Value	85,261
Book Value	85,261
APIC, Net of Tax Increase/ (Decrease)	0
Realized investment gains (losses), net of tax	0
Prudential Insurance December 2019 Sale Fixed Maturity
Related Party Transaction [Line Items]
Fair Value	21,425
Book Value	20,628
APIC, Net of Tax Increase/ (Decrease)	0
Realized investment gains (losses), net of tax	$ 797