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Investments - Impaired Loans (Details)
12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Sep. 30, 2019
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Impaired loans without valuation allowances $ 4,000,000 $ 4,000,000    
Less: Allowances for losses on impaired loans 0 0    
Impaired loans, net 4,000,000 4,000,000    
Unpaid principal balance of impaired loans $ 5,000,000 5,000,000    
Mortgage loans in process of foreclosure   0    
Mortgage Loans Number of Foreclosures 2      
Mortgage Loans Foreclosed Carrying Amount $ 6,000,000      
Impaired Financing Receivable, Average Recorded Investment 9,000,000 4,000,000 $ 4,000,000  
Interest income recognized on impaired loans, on an accrual basis 1,000,000 0 0  
Interest income recognized on impaired loans, on a cash basis 1,000,000 0 0  
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method $ 0 0 $ 0  
Financial Asset, 60 to 89 Days Past Due        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans in arrears   $ 0   $ 0