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Reinsurance (Narrative) (Details) - USD ($)
$ in Millions
6 Months Ended 21 Months Ended 36 Months Ended 48 Months Ended
Jan. 01, 2017
Jan. 01, 2014
Dec. 31, 2013
Jul. 01, 2011
Dec. 31, 2010
Dec. 31, 2009
Jan. 31, 2001
Jun. 30, 2017
Dec. 31, 2016
Dec. 31, 2016
Dec. 31, 2013
Dec. 31, 2013
Union Hamilton Reinsurance, Ltd. | Quote Share Reinsurance                        
Effects of Reinsurance [Line Items]                        
Reinsurance Retention Policy, Amount Retained                 $ 2,900      
Reinsurance Retention Policy, Reinsured Risk, Percentage                 50.00%      
Affiliated Entity | PAR U                        
Effects of Reinsurance [Line Items]                        
Reinsurance Retention Policy, Reinsured Risk, Percentage       95.00% 70.00%              
Affiliated Entity | PURC                        
Effects of Reinsurance [Line Items]                        
Reinsurance Retention Policy, Reinsured Risk, Percentage                   95.00% 70.00%  
Affiliated Entity | PARCC                        
Effects of Reinsurance [Line Items]                        
Reinsurance Retention Policy, Reinsured Risk, Percentage           90.00%            
Affiliated Entity | PAR Term                        
Effects of Reinsurance [Line Items]                        
Reinsurance Retention Policy, Reinsured Risk, Percentage                       95.00%
Affiliated Entity | Prudential of Taiwan                        
Effects of Reinsurance [Line Items]                        
Related Party Transaction, Term             2 years          
Affiliated Entity | Prudential Insurance                        
Effects of Reinsurance [Line Items]                        
Reinsurance Retention Policy, Reinsured Risk, Percentage               100.00%        
Affiliated Entity | Term Re                        
Effects of Reinsurance [Line Items]                        
Reinsurance Retention Policy, Reinsured Risk, Percentage   95.00%                    
Affiliated Entity | UPARC                        
Effects of Reinsurance [Line Items]                        
Reinsurance Retention Policy, Excess Retention, Percentage     30.00%                  
Reinsurance Retention Policy, Amount Retained     $ 1                  
Reinsurance Retention Policy, Reinsured Risk, Percentage     27.00%                  
Reinsurance Retention Policy, Uncollected Charges And Fees Risk, Percentage     30.00%                  
Affiliated Entity | GUL Re                        
Effects of Reinsurance [Line Items]                        
Reinsurance Retention Policy, Reinsured Risk, Percentage 95.00%