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Other charges (Tables)
12 Months Ended
Dec. 31, 2021
Text block [abstract]  
Summary of Other Charges
 
 
 
 
 
 
 
 
 
 
 
 
 
 
       
    
                2021
                     2020                      2019    
       
Other charges
  
 
104
 
  
 
150
 
  
 
1