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Investments (Sales or Disposals of Fixed Maturity Securities) (Details) - Fixed maturity securities - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Debt Securities, Available-for-sale [Line Items]        
Proceeds $ 3,416 $ 2,450 $ 6,636 $ 5,288
Gross investment gains 99 9 163 12
Gross investment losses (37) (74) (116) (115)
Net investment gains (losses) $ 62 $ (65) $ 47 $ (103)