XML 76 R65.htm IDEA: XBRL DOCUMENT v3.19.2
Credit Facilities (Narrative) (Details)
 6 Months Ended 60 Months Ended
May 26, 2019
Jun. 22, 2012
USD ($)
Jun. 30, 2019
GBP (£)
Item
Dec. 31, 2005
Jun. 30, 2019
USD ($)
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      
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     0.0035   0.0035      
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     2500.00%          
Percentage amount of increase in consolidated net worth from new issuance required to be reserved to maintain compliance with facility covenants     2500.00%          
Increase in reserves due to new issuance during the period required to maintain compliance with facility covenants         6,170,284,000      
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 debt-to-capital ratio     0.0035   0.0035      
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         $ 6,161,032,000      
Percentage commitment fee per annum     0.10%          
Per annum commitment fee on undrawn credit     0.35%