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Credit Facilities (Narrative) (Details)
 9 Months Ended 60 Months Ended
May 26, 2019
Jun. 22, 2012
USD ($)
Sep. 30, 2019
GBP (£)
Item
Rate
Dec. 31, 2005
Sep. 30, 2019
USD ($)
Rate
Jun. 30, 2019
USD ($)
Dec. 31, 2018
GBP (£)
Dec. 31, 2018
USD ($)
May 26, 2016
USD ($)
Line of Credit Facility [Line Items]                  
Line of credit facility, number of facilities | Item     2            
Line of credit facility, commitment     £ 30,000,000   $ 1,000,000,000        
Maximum percentage of admitted assets allowed for borrowing base     10.00%   10.00%        
Admitted assets for FHLB           $ 12,310,510,000      
Borrowings from FHLB         $ 0        
Maximum amount available under FHLB         1,231,051,000        
Wells Fargo Bank Group Credit Facility [Member]                  
Line of Credit Facility [Line Items]                  
Line of credit facility, commitment   $ 800,000,000     $ 800,000,000     $ 800,000,000 $ 800,000,000
Line of credit facility, term of credit facility 5 years 4 years              
Line of credit facility, required minimum debt-to-capital ratio | Rate     35.00%   35.00%        
Line of credit facility, required minimum net worth         $ 5,370,979,000        
Percentage amount of consolidated net income required to be reserved to maintain compliance with facility covenants     25.00%            
Percentage amount of increase in consolidated net worth from new issuance required to be reserved to maintain compliance with facility covenants     25.00%            
Increase in reserves due to new issuance during the period required to maintain compliance with facility covenants         6,198,350,000        
Wells Fargo Bank Group Credit Facility Tranche One [Member]                  
Line of Credit Facility [Line Items]                  
Line of credit facility, commitment         200,000,000     200,000,000  
Wells Fargo Bank Group Credit Facility Tranche One [Member] | Federal Funds [Member]                  
Line of Credit Facility [Line Items]                  
Line of credit facility, spread on variable rate basis     0.50%            
Wells Fargo Bank Group Credit Facility Tranche One [Member] | London Interbank Offered Rate (LIBOR) [Member]                  
Line of Credit Facility [Line Items]                  
Line of credit facility, spread on variable rate basis     1.00%            
Wells Fargo Bank Group Credit Facility Tranche Two [Member]                  
Line of Credit Facility [Line Items]                  
Line of credit facility, commitment         600,000,000     600,000,000  
Citibank Bilateral Agreement [Member]                  
Line of Credit Facility [Line Items]                  
Line of credit facility, commitment         200,000,000     $ 200,000,000  
Percentage of interest on the principal amount of letters of credit issued     0.35%            
Percentage of interest on the principal amount of issued extended tenor letters of credit     0.45%            
Maximum term allowed to execute issued letters of credit     60 months            
Per annum commitment fee on undrawn credit     0.15%            
Lloyds Bank plc Credit Facility [Member]                  
Line of Credit Facility [Line Items]                  
Line of credit facility, commitment | £     £ 30,000,000       £ 30,000,000    
Line of credit facility, term of credit facility     4 years            
Line of credit facility, required minimum net worth         5,326,009,000        
Consolidated net worth, percentage       70.00%          
Percentage amount of consolidated net income required to be reserved to maintain compliance with facility covenants     25.00%            
Percentage amount of increase in consolidated net worth from new issuance required to be reserved to maintain compliance with facility covenants     25.00%            
Increase in reserves due to new issuance during the period required to maintain compliance with facility covenants         $ 6,189,098,000        
Percentage commitment fee per annum     0.10%            
Per annum commitment fee on undrawn credit     0.35%