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Profit sharing and rebates (Tables)
 12 Months Ended
Dec. 31, 2021
Text block [abstract]  
Summary of Profit Sharing and Rebates
 
 
 
 
 
 
 
 
 
 
 
 
 
 
       
     
                2021
                     2020                     2019  
       
Surplus interest bonuses
      2        2        2   
       
Profit appropriated to policyholders
      13       7       15  
       
Total
   
 
14
 
  
 
8
 
  
 
17