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Policyholder claims and benefits (Tables)
12 Months Ended
Dec. 31, 2018
Text block [abstract]  
Summary of Policyholder Claims and Benefits
     2018             2017     2016  

Benefits and claims paid life

     19,673          23,634       23,877  

Benefits and claims paid non-life

     1,658          1,903       2,052  

Change in valuation of liabilities for insurance contracts

     (2,639        22,741       16,193  

Change in valuation of liabilities for investment contracts

     (8,143        (2,644     (104

Other

     9          (34     (45

Total

     10,557                45,599           41,974