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Investments Investments - Rollforward of credit loss allowance for mortgage loans (Details) - Mortgage loans - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Roll Forward]        
Beginning balance $ (86)   $ (3)  
Net decreases (increases) related to credit losses 1 $ 0 (40) $ 0
Ending balance $ (85)   (85)  
Cumulative effect of change in accounting principle        
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Roll Forward]        
Beginning balance     $ (42)