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Investments - Troubled Debt Restructuring (Details)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2020
USD ($)
loan
Mar. 31, 2019
USD ($)
loan
Dec. 31, 2019
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net, Available-for-sale Securities $ 7 $ 18  
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 0 0