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Credit Facilities (Narrative) (Details)
6 Months Ended 12 Months Ended
May 26, 2016
USD ($)
Jun. 22, 2012
USD ($)
Jun. 30, 2020
GBP (£)
Item
Rate
Dec. 31, 2018
Jun. 30, 2020
USD ($)
Rate
Mar. 25, 2020
USD ($)
Dec. 31, 2019
GBP (£)
Dec. 31, 2019
USD ($)
Line of Credit Facility [Line Items]                
Line of credit facility, number of facilities | Item     2          
Line of credit facility, commitment     £ 52,175,000   $ 1,000,000,000      
Maximum percentage of admitted assets allowed for borrowing base     10.00%   10.00%      
Admitted assets for FHLB         $ 13,435,683,000      
Borrowings from FHLB         0      
Maximum amount available under FHLB         1,343,568,000      
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         6,309,551,000      
Revolving credit borrowings         683,944,000     623,484,000
Wells Fargo Bank Group Credit Facility Tranche One [Member]                
Line of Credit Facility [Line Items]                
Line of credit facility, commitment         200,000,000      
Revolving credit borrowings           $ 50,000,000   0
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
Wells Fargo Bank Group Credit Facility Tranche Two [Member] | Debt Instrument Redemption Period Two [Member]                
Line of Credit Facility [Line Items]                
Revolving credit borrowings         5,324,000     1,649,000
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%          
Revolving credit borrowings         $ 144,951,000     $ 147,970,000
Lloyds Bank plc Credit Facility [Member]                
Line of Credit Facility [Line Items]                
Line of credit facility, commitment | £     £ 52,175,000       £ 47,000,000  
Line of credit facility, required minimum debt-to-capital ratio | Rate     35.00%   35.00%      
Line of credit facility, required minimum net worth         $ 5,532,663,000      
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%          
Percentage commitment fee per annum     0.10%          
Per annum commitment fee on undrawn credit     0.35%          
Revolving credit borrowings | £     £ 52,175,000       £ 47,000,000