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Investments - Troubled Debt Restructuring (Details)
$ in Millions
3 Months Ended 9 Months Ended
Mar. 31, 2020
Sep. 30, 2020
USD ($)
loan
Sep. 30, 2019
USD ($)
loan
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Loans and Leases Receivable, Loan to Value, Benchmark Ratio 100.00% 100.00%  
Loans and Leases Receivable, Debt Service Coverage, Benchmark Ratio 100.00% 100.00%  
Private Placement      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Troubled debt restructuring, number of contracts | loan   0 1
Pre-modification carrying value     $ 74
Post-modification carrying value     $ 57
Commercial Mortgage Loans      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Troubled debt restructuring, number of contracts | loan   1 1
Post-modification carrying value   $ 3