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Investments (allowance for credit losses rollforward) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2020
Rollforward of available-for-Sale securities allowance for credit losses    
Beginning Balance $ (2)  
Ending Balance (30) $ (30)
Corporate debt securities [Member]    
Rollforward of available-for-Sale securities allowance for credit losses    
Debt Securities, Available-for-sale, Allowance for Credit Loss, Not Previously Recorded 0 13
Available-for-sale securities [Member]    
Rollforward of available-for-Sale securities allowance for credit losses    
Debt Securities, Available-for-sale, Allowance for Credit Loss, Not Previously Recorded   13
Corporate debt securities [Member]    
Rollforward of available-for-Sale securities allowance for credit losses    
Beginning Balance 13 0 [1]
Ending Balance 13 13
Asset backed securities [Member]    
Rollforward of available-for-Sale securities allowance for credit losses    
Beginning Balance 1 0 [1]
Debt Securities, Available-for-sale, Allowance for Credit Loss, Not Previously Recorded 0 0
Debt Securities, Available-for-sale, Allowance for Credit Loss, Period Increase (Decrease) 0 1
Ending Balance 1 1
Available-for-sale securities [Member]    
Rollforward of available-for-Sale securities allowance for credit losses    
Beginning Balance 14 0 [1]
Debt Securities, Available-for-sale, Allowance for Credit Loss, Not Previously Recorded 0  
Debt Securities, Available-for-sale, Allowance for Credit Loss, Period Increase (Decrease) 0 1
Ending Balance $ 14 $ 14
[1] Prior to January 1, 2020, credit losses on Available-for-Sale securities were not recorded in an allowance but were recorded as a reduction of the book value of the security if the security was other-than-temporarily impaired. There is no adoption impact due to the prospective transition for Available-for-Sale securities.