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Policyholder claims and benefits (Tables)
 12 Months Ended
Dec. 31, 2019
Text block [abstract]  
Summary of Policyholder Claims and Benefits
    
 
2019
     2018     2017 
Benefits and claims paid life
   18,824      19,673      23,634 
Benefits and claims paid non-life
   1,635      1,658      1,903 
Change in valuation of liabilities for insurance contracts
   30,620      (2,639)      22,741 
Change in valuation of liabilities for investment contracts
   5,768      (8,143)      (2,644) 
Other
   (50)      9      (34) 
Total
  
 
     56,797
 
    
 
     10,557
 
    
 
     45,599