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Reinsurance (tables)
 12 Months Ended
Dec. 31, 2017
Reinsurance disclosure  
Summary of reinsurance financial data [Table Text Block]

(for the year ended December 31, in millions)
  2017   2016   2015  

Written premiums

                    

Direct

   $ 26,648   $ 25,567   $ 24,939  

Assumed

     1,000     928     843  

Ceded

     (1,429 )   (1,537 )   (1,661 )
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Total net written premiums

   $ 26,219   $ 24,958   $ 24,121  
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Earned premiums

                    

Direct

   $ 26,189   $ 25,262   $ 24,740  

Assumed

     965     875     814  

Ceded

     (1,471 )   (1,603 )   (1,680 )
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Total net earned premiums

   $ 25,683   $ 24,534   $ 23,874  
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Percentage of assumed earned premiums to net earned premiums

     3.8 %   3.6 %   3.4 %
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Ceded claims and claim adjustment expenses incurred

   $ 1,225   $ 762   $ 1,034  
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Reinsurance recoverables [Table Text Block]

(at December 31, in millions)
  2017   2016  

Gross reinsurance recoverables on paid and unpaid claims and claim adjustment expenses

   $ 3,303   $ 3,181  

Allowance for uncollectible reinsurance

     (111 )   (116 )
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Net reinsurance recoverables

     3,192     3,065  

Mandatory pools and associations

     2,011     2,054  

Structured settlements

     3,106     3,168  
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Total reinsurance recoverables

   $ 8,309   $ 8,287  
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