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Investment gains/losses (Tables)
6 Months Ended
Jun. 30, 2017
Investments, Debt and Equity Securities [Abstract]  
Schedule of investment gains/losses

Investment gains/losses included in earnings are summarized below (in millions).

     Second Quarter      First Six Months  
           2017                  2016                  2017                  2016        

Fixed maturity securities—

           

Gross gains from sales and redemptions

   $ 15       $ 20       $ 26       $ 39    

Gross losses from sales and redemptions

     (8)        (14)        (14)        (17)   

Equity securities—

           

Gross gains from sales and redemptions

     359         740         784         2,547    

Gross losses from sales and redemptions

     (82)        (53)        (207)        (63)   

Other-than-temporary impairment losses

     —         (63)        —         (63)   

Other

            13         16         50    
  

 

 

    

 

 

    

 

 

    

 

 

 
   $     290       $     643       $ 605       $ 2,493