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Deferred Revenue (Tables)
 12 Months Ended
Dec. 31, 2020
Text block [abstract]  
Summary of Deferred Revenue
   2020   2019 
   Million   Million 
As of January 1
          
- Current portion
   57,825    63,185 
-
Non-current
portion
   6,861    4,881 
   
 
 
   
 
 
 
    64,686    68,066 
Additions during the year
   260,950    256,432 
Recognized in the consolidated statements of comprehensive income
   (238,007)    (259,812) 
   
 
 
   
 
 
 
As of December 31
   87,629    64,686 
Less:
c
urrent portion
   (79,028)    (57,825) 
   
 
 
   
 
 
 
Non-current
portion
   8,601    6,861