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Intangible Assets, Net and Goodwill - Additional Information (Detail)
R$ in Thousands, $ in Thousands, $ in Thousands, € in Millions
 1 Months Ended 12 Months Ended
Feb. 29, 2020
MXN ($)
Band
Feb. 29, 2020
USD ($)
Band
Jan. 31, 2020
MXN ($)
Dec. 31, 2019
MXN ($)
Dec. 31, 2019
COP ($)
Jan. 31, 2019
MXN ($)
Dec. 31, 2018
MXN ($)
Dec. 31, 2018
BRL (R$)
Dec. 31, 2020
MXN ($)
Dec. 31, 2020
EUR (€)
Dec. 31, 2019
MXN ($)
Dec. 31, 2018
MXN ($)
Acquisitions 2020 [Member]                        
Disclosure of intangible assets and goodwill [line items]                        
Amortization of intangible assets                 $ 20,338,080   $ 20,209,434 $ 25,798,610
IFETEL [Member]                        
Disclosure of intangible assets and goodwill [line items]                        
Amount paid for license                     $ 459,668  
Estimated useful life of intangible assets                     20 years  
Submarine Cable [Member]                        
Disclosure of intangible assets and goodwill [line items]                        
Estimated useful life of intangible assets                     10 years  
Renewal of license [member]                        
Disclosure of intangible assets and goodwill [line items]                        
Amount paid for license                 3,457,251      
Twenty Twenty Business Acquisition [Member]                        
Disclosure of intangible assets and goodwill [line items]                        
Number of brands | Band 2,500 2,500                    
30 Mhz spectrum [member] | Twenty Twenty Business Acquisition [Member]                        
Disclosure of intangible assets and goodwill [line items]                        
Amount paid for license $ 9,246,825 $ 30                    
Estimated useful life of intangible assets 20 years 20 years                    
400 MHZ [Member] | Renewal of license [member]                        
Disclosure of intangible assets and goodwill [line items]                        
Amount paid for license           $ 1,649,525            
400 MHZ [Member] | Twenty Twenty Business Acquisition [Member]                        
Disclosure of intangible assets and goodwill [line items]                        
Amount paid for license                 1,806,875      
Dominican Republic [member]                        
Disclosure of intangible assets and goodwill [line items]                        
Amount paid for license             $ 709,829 R$ 1,831,427        
Estimated useful life of intangible assets             11 years 11 years        
Paraguay Puerto Rico Europe Argentina and other countries [member]                        
Disclosure of intangible assets and goodwill [line items]                        
Amount paid for license                 3,517,415      
Comcel [Member] | Renewal of license [member]                        
Disclosure of intangible assets and goodwill [line items]                        
Amount paid for license       $ 2,753,768 $ (468,511,573,375)              
Estimated useful life of intangible assets       20 years 20 years              
Puerto Rico Argentina Guatemala Panam And Others Countries [Member]                        
Disclosure of intangible assets and goodwill [line items]                        
Amount paid for license                     $ 1,862,934  
Puerto Rico Argentina Guatemala Panam And Others Countries [Member] | Twenty Twenty Business Acquisition [Member]                        
Disclosure of intangible assets and goodwill [line items]                        
Amount paid for license                 1,701,682      
CTE [Member] | Twenty Twenty Business Acquisition [Member]                        
Disclosure of intangible assets and goodwill [line items]                        
Amount paid for license     $ 620,052                  
Number Of Pair of Frequencies     12 months                  
Austria [member]                        
Disclosure of intangible assets and goodwill [line items]                        
Amount paid for license                     $ 3,023,732  
Austria [member] | 3.5 GHz [Member]                        
Disclosure of intangible assets and goodwill [line items]                        
Amount paid for license | €                   € 64.3    
Belarus [member] | 2.1 GHz [Member]                        
Disclosure of intangible assets and goodwill [line items]                        
Amount paid for license | €                   9.5    
Croatia [member] | 2.1 GHz [Member]                        
Disclosure of intangible assets and goodwill [line items]                        
Amount paid for license | €                   € 7.2    
Slovenia [member] | Twenty Twenty Business Acquisition [Member]                        
Disclosure of intangible assets and goodwill [line items]                        
Amount paid for license                 $ 1,704,280