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Business and Basis of Presentation (Narratives) (Details) - USD ($)
$ in Thousands
1 Months Ended 6 Months Ended
Apr. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Apr. 01, 2016
Mar. 31, 2016
Effects of Reinsurance [Line Items]          
Ceding commissions   $ 663 $ 107    
Contributed capital   $ 0 $ 781,125    
PAI          
Effects of Reinsurance [Line Items]          
Contributed capital $ 8,400,000        
Variable Annuity          
Effects of Reinsurance [Line Items]          
Reinsurance recoverables       $ 695,000 $ 3,776,000
Variable Annuity | Impacts of Recapture          
Effects of Reinsurance [Line Items]          
Reinsurance recoverables       (3,401,000)  
Gain (loss) recognized on transfer 300,000        
Variable Annuity | Impacts of Recapture | Pruco Re          
Effects of Reinsurance [Line Items]          
Asset Transfer       3,100,000  
Reinsurance recoverables       (3,400,000)  
Gain (loss) recognized on transfer (300,000)        
Variable Annuity | Impacts of Recapture | Pruco Life          
Effects of Reinsurance [Line Items]          
Asset Transfer       7,100,000  
Reinsurance recoverables       9,400,000  
Ceding commissions 3,600,000        
Variable Annuity | Impacts of Reinsurance          
Effects of Reinsurance [Line Items]          
Reinsurance recoverables       $ 320,000  
Variable Annuity | Impacts of Reinsurance | Pruco Life          
Effects of Reinsurance [Line Items]          
Ceding commissions 2,500,000        
Variable Annuity | Reassignment of debt | Impacts of Recapture | Pruco Life          
Effects of Reinsurance [Line Items]          
Ceding commissions 1,100,000        
Living benefit guarantees | Impacts of Reinsurance          
Effects of Reinsurance [Line Items]          
Gain (loss) recognized on transfer $ (2,600,000)