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Business and Basis of Presentation (Narrative) (Details)
$ in Thousands
1 Months Ended 12 Months Ended
Apr. 30, 2016
USD ($)
Dec. 31, 2017
USD ($)
subsidiary
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Sep. 30, 2016
USD ($)
Apr. 01, 2016
USD ($)
Mar. 31, 2016
USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract]              
Number of Subsidiaries | subsidiary   2          
Effects of Reinsurance [Line Items]              
Reinsurance recoverables   $ 32,555,500 $ 28,674,226        
Ceding commissions   $ 142,781 $ (113,501) $ 8,770      
Variable Annuity              
Effects of Reinsurance [Line Items]              
Reinsurance recoverables           $ 28,736,000 $ 24,781,000
Variable Annuity | Impacts of Recapture              
Effects of Reinsurance [Line Items]              
Reinsurance recoverables           (6,312,000)  
Variable Annuity | Impacts of Recapture | Pruco Re              
Effects of Reinsurance [Line Items]              
Asset transfer           4,200,000  
Reinsurance recoverables           6,300,000  
Gain (loss) recognized on transfer $ (2,100,000)            
Variable Annuity | Impacts of Recapture | PALAC              
Effects of Reinsurance [Line Items]              
Asset transfer         $ (7,000,000)    
Ceding commissions 3,600,000            
Variable Annuity | Impacts of Recapture | Prudential Insurance              
Effects of Reinsurance [Line Items]              
Asset transfer         $ (700,000)    
Ceding commissions 400,000            
Dividend paid 2,600,000            
Variable Annuity | Impacts of Recapture | PALAC and Prudential Insurance              
Effects of Reinsurance [Line Items]              
Reinsurance recoverables           $ 10,300,000  
Gain (loss) recognized on transfer (200,000)            
Variable Annuity | Reassignment of debt | Impacts of Recapture | PALAC              
Effects of Reinsurance [Line Items]              
Ceding commissions 1,100,000            
Variable Annuity | Reassignment of debt | Impacts of Recapture | Prudential Insurance              
Effects of Reinsurance [Line Items]              
Ceding commissions 100,000            
Living benefit guarantees | Impacts of Recapture              
Effects of Reinsurance [Line Items]              
Gain (loss) recognized on transfer $ 2,800,000