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Trade receivables and accrued revenue (Tables)
 12 Months Ended
Dec. 31, 2019
Text block [abstract]  
Summary of Trade Receivables and Accrued Income
   
31 December
2019
   
31 December
2018
 
Receivables from subscribers
   2,090,242    1,647,236 
Accounts and notes receivable
   745,442    555,436 
Undue assigned contracted receivables
   298,291    271,306 
  
 
 
   
 
 
 
  
 
3,133,975
 
  
 
2,473,978