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Investments Investments - Gross unrealized losses by unrealized loss position and credit quality (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Schedule of Investments [Line Items]    
Total unrealized losses $ (1)  
Investment grade fixed income securities    
Schedule of Investments [Line Items]    
Fixed income securities with unrealized loss position less than 20% of amortized cost, net (1) (2) (82)  
Fixed income securities with unrealized loss position greater than or equal to 20% of amortized cost (29)  
Total unrealized losses (111) $ (61)
Below investment grade fixed income securities    
Schedule of Investments [Line Items]    
Fixed income securities with unrealized loss position less than 20% of amortized cost, net (1) (2) (124)  
Fixed income securities with unrealized loss position greater than or equal to 20% of amortized cost (80)  
Total unrealized losses (204) (35)
Unrealized losses having loss of less than twenty percent, less than 12 months (109)  
Fixed income securities    
Schedule of Investments [Line Items]    
Fixed income securities with unrealized loss position less than 20% of amortized cost, net (1) (2) (206)  
Fixed income securities with unrealized loss position greater than or equal to 20% of amortized cost (109)  
Total unrealized losses $ (315) $ (96)