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Investments - Investments - Commercial Mortgage Loans Credit Quality (Details)
$ in Millions
Mar. 31, 2020
USD ($)
Jan. 01, 2020
USD ($)
Dec. 31, 2019
USD ($)
Financing Receivable, Credit Quality Indicator [Line Items]      
Financing Receivable, before Allowance for Credit Loss   $ 4,215 $ 4,215
Commercial Loan [Member]      
Financing Receivable, Credit Quality Indicator [Line Items]      
Financing Receivable, before Allowance for Credit Loss $ 4,374   $ 4,215
Avg. Debt-Service Coverage Ratio 2.48   2.46
Commercial Loan [Member] | 65% - 80%      
Financing Receivable, Credit Quality Indicator [Line Items]      
Financing Receivable, before Allowance for Credit Loss     $ 376
Avg. Debt-Service Coverage Ratio 1.57   1.53
Commercial Loan [Member] | Less than 65%      
Financing Receivable, Credit Quality Indicator [Line Items]      
Financing Receivable, before Allowance for Credit Loss     $ 3,839
Avg. Debt-Service Coverage Ratio 2.56   2.56