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Investments (OTTI rollforward) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2020
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]    
Beginning Balance $ (4)  
Ending Balance (28) $ (28)
Corporate debt securities [Member]    
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]    
Debt Securities, Available-for-sale, Allowance for Credit Loss, Not Previously Recorded   13
Available-for-sale securities [Member]    
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]    
Debt Securities, Available-for-sale, Allowance for Credit Loss, Not Previously Recorded   13
Corporate debt securities [Member]    
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]    
Beginning Balance 13 0 [1]
Ending Balance 13 13
Asset backed securities [Member]    
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]    
Beginning Balance 0 0 [1]
Debt Securities, Available-for-sale, Allowance for Credit Loss, Period Increase (Decrease) 1 1
Ending Balance 1 1
Available-for-sale securities [Member]    
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]    
Beginning Balance 13 0 [1]
Debt Securities, Available-for-sale, Allowance for Credit Loss, Period Increase (Decrease) 1 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.