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Investments - Write Downs and Sales (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Pre-Tax Asset Write-downs [Line Items]        
Pre-Tax Asset Write-Downs     $ 23 $ 19
Sales Information For Available For Sale Fixed Maturities Equity Securities [Abstract]        
Proceeds from sales $ 657 $ 446 1,930 1,376
Gross gains on sales 5 26 23 85
Gross losses on sales $ (4) $ (3) $ (33) $ (7)