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Investments - Write Downs and Sales (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Pre-Tax Asset Write-downs [Line Items]        
Pre-Tax Asset Write-Downs     $ 23 $ 13
Sales Information For Available For Sale Fixed Maturities Equity Securities [Abstract]        
Proceeds from sales $ 774 $ 516 1,273 930
Gross gains on sales 13 12 18 59
Gross losses on sales $ (7) $ (2) $ (29) $ (4)