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Profit sharing and rebates (Tables)
 12 Months Ended
Dec. 31, 2019
Text block [abstract]  
Summary of Profit Sharing and Rebates
    
 
2019
     2018     2017 
Surplus interest bonuses
   2      2      2 
Profit appropriated to policyholders
   15      21      21 
Total
  
 
             17
 
    
 
             23
 
    
 
             23