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Investments - Investments - Mortgage Loans- Valuation Allowance Activity (Details)
Mar. 31, 2020
USD ($)
Jan. 01, 2020
USD ($)
Dec. 31, 2019
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Financing Receivable, before Allowance for Credit Loss   $ 4,215,000,000 $ 4,215,000,000    
Financing Receivable, Allowance for Credit Loss   $ 19,000,000 $ 0    
Number of loans held-for-sale 0   0    
Number of loans with extensions or restructuring 0        
Current Weighted Average Loan to Value Ratio of Commercial Mortgage Loan 52.00%        
Original Weighted Average Loan to Value Ratio of Commercial Mortgage loan 61.00%        
Commercial Loan [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Financing Receivable, Individually Evaluated for Impairment $ 0        
Financing Receivable, before Allowance for Credit Loss 4,374,000,000   $ 4,215,000,000    
Financing Receivable, Allowance for Credit Loss 21,000,000   0 $ 1,000,000 $ 1,000,000
Commercial Loan [Member] | Mortgage loans (net of ACL of $21 and $0)          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Past-due mortgages     0    
Commercial Loan [Member] | Amortized Cost [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Financing Receivable, before Allowance for Credit Loss $ 4,374,000,000   $ 4,200,000,000