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Leases - Schedule of right-of-use assets (Detail) - 6 months ended Jun. 30, 2019
$ in Millions, $ in Millions
MXN ($)
USD ($)
 [2]
Disclosure of quantitative information about right-of-use assets [line items]    
Additions $ 3,038  
Disposals (255)  
Remeasurements 1,053  
Depreciation (3,717)  
Effects of changes in foreign exchange rates (32)  
Ending balance [1] 50,307 $ 2,619
At cost [member]    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance 50,220  
Real estate [member]    
Disclosure of quantitative information about right-of-use assets [line items]    
Additions 2,955  
Disposals (250)  
Remeasurements 1,053  
Depreciation (3,531)  
Effects of changes in foreign exchange rates (5)  
Ending balance 49,334  
Real estate [member] | At cost [member]    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance 49,112  
Other [member]    
Disclosure of quantitative information about right-of-use assets [line items]    
Additions 83  
Disposals (5)  
Depreciation (186)  
Effects of changes in foreign exchange rates (27)  
Ending balance 973  
Other [member] | At cost [member]    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance $ 1,108  
[1] The Company initially adopted IFRS 16 at January 1st, 2019 using the modified retrospective method under which the comparative information is not restated. - See Note 2.4.1
[2] Convenience translation to U.S. dollars ($) - See Note 2.2.3