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Credit Facilities (Narrative) (Details)
 12 Months Ended
Nov. 07, 2019
GBP (£)
May 26, 2016
USD ($)
Jun. 22, 2012
USD ($)
Dec. 31, 2019
GBP (£)
Item
Rate
Dec. 31, 2018
GBP (£)
Dec. 31, 2019
USD ($)
Item
Rate
Dec. 31, 2018
USD ($)
Line of Credit Facility [Line Items]              
Line of credit facility, number of facilities | Item       2      
Line of credit facility, commitment       £ 47,000,000   $ 1,000,000,000  
Maximum percentage of admitted assets allowed for borrowing base       10.00%   10.00%  
Admitted assets for FHLB           $ 12,518,844,000  
Borrowings from FHLB           0  
Maximum amount available under FHLB           1,251,884,000  
Wells Fargo Bank Group Credit Facility [Member]              
Line of Credit Facility [Line Items]              
Line of credit facility, term of credit facility   5 years 4 years        
Line of credit facility, commitment   $ 800,000,000 $ 800,000,000     $ 800,000,000 $ 800,000,000
Line of credit facility, number of tranches | Item       2   2  
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           6,256,094,000  
Wells Fargo Bank Group Credit Facility Tranche One [Member]              
Line of Credit Facility [Line Items]              
Line of credit facility, expiration date       Dec. 31, 2020      
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, expiration date         Dec. 31, 2019    
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, term of credit facility 4 years            
Line of credit facility, commitment | £ £ 47,000,000     £ 47,000,000 £ 30,000,000    
Line of credit facility, required minimum debt-to-capital ratio       0.35   0.35  
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           $ 6,246,842,000  
Percentage commitment fee per annum       0.10%      
Per annum commitment fee on undrawn credit       0.35%