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Employee Benefit and Related Expenses (Tables)
 12 Months Ended
Dec. 31, 2019
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Summary of Employee Benefit and Related Expenses
   2019   2018   2017 
   Million   Million   Million 
Salaries, wages, labor service expenses and other benefits
   86,610    81,843    74,427 
Retirement costs: contributions to defined contribution retirement plans
   15,908    12,096    11,086 
  
 
 
   
 
 
   
 
 
 
   102,518    93,939    85,513