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Other Gains (Tables)
 12 Months Ended
Dec. 31, 2019
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Summary of Other Gains
   2019   2018   2017 
   Million   Million   Million 
Compensation income
   915    1,184    1,118 
Others
   3,114    1,722    1,271 
  
 
 
   
 
 
   
 
 
 
   4,029    2,906    2,389