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Investments - Troubled Debt Restructuring (Details)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
loan
Jun. 30, 2018
loan
Jun. 30, 2019
USD ($)
loan
Jun. 30, 2018
loan
Commercial Portfolio Segment        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Financing Receivable, Modifications, Number of Contracts 0 0 1 0
Financing Receivable, Troubled Debt Restructuring, Premodification | $     $ 74  
Financing Receivable, Troubled Debt Restructuring, Postmodification | $     $ 56  
Commercial Real Estate Portfolio Segment        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Financing Receivable, Modifications, Number of Contracts 0 0 0 0
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts     0