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Reinsurance (tables)
 12 Months Ended
Dec. 31, 2016
Reinsurance disclosure  
Summary of reinsurance financial data [Table Text Block]

(for the year ended December 31, in millions)
  2016   2015   2014  

Written premiums

                    

Direct

   $ 25,567   $ 24,939   $ 24,844  

Assumed

     928     843     788  

Ceded

     (1,537 )   (1,661 )   (1,728 )
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Total net written premiums

   $ 24,958   $ 24,121   $ 23,904  
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Earned premiums

                    

Direct

   $ 25,262   $ 24,740   $ 24,810  

Assumed

     875     814     743  

Ceded

     (1,603 )   (1,680 )   (1,840 )
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Total net earned premiums

   $ 24,534   $ 23,874   $ 23,713  
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Percentage of assumed earned premiums to net earned premiums

     3.6 %   3.4 %   3.1 %
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Ceded claims and claim adjustment expenses incurred

   $ 762   $ 1,034   $ 953  
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Reinsurance recoverables [Table Text Block]

(at December 31, in millions)
  2016   2015  

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

   $ 3,181   $ 3,848  

Allowance for uncollectible reinsurance

     (116 )   (157 )
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Net reinsurance recoverables

     3,065     3,691  

Mandatory pools and associations

     2,054     2,015  

Structured settlements

     3,168     3,204  
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Total reinsurance recoverables

   $ 8,287   $ 8,910  
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