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Investments - Troubled Debt Restructuring (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
USD ($)
loan
Sep. 30, 2018
loan
Sep. 30, 2019
USD ($)
loan
Sep. 30, 2018
loan
Commercial Portfolio Segment        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Financing Receivable, Modifications, Number of Contracts | loan 1 0 1  
Financing Receivable, Troubled Debt Restructuring, Premodification | $ $ 2   $ 2  
Financing Receivable, Troubled Debt Restructuring, Postmodification | $ $ 2   $ 2  
Private Placement        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Financing Receivable, Modifications, Number of Contracts | loan 0   1  
Financing Receivable, Troubled Debt Restructuring, Premodification | $     $ 74  
Financing Receivable, Troubled Debt Restructuring, Postmodification | $     $ 54  
Commercial Real Estate Portfolio Segment        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Financing Receivable, Modifications, Number of Contracts | loan 0     0
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts | loan     0 0