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Intangible Assets, Net and Goodwill - Additional Information (Detail)
R$ in Thousands, $ in Thousands, € in Millions
 1 Months Ended 12 Months Ended
Jul. 14, 2017
MXN ($)
Feb. 24, 2017
MXN ($)
Dec. 31, 2019
MXN ($)
Dec. 31, 2019
COP ($)
Jan. 31, 2019
MXN ($)
Dec. 31, 2018
MXN ($)
Dec. 31, 2018
BRL (R$)
Dec. 31, 2019
MXN ($)
Dec. 31, 2019
EUR (€)
Dec. 31, 2018
MXN ($)
Dec. 31, 2017
MXN ($)
Acquisitions 2019 [Member]                      
Disclosure of intangible assets and goodwill [line items]                      
Amortization of intangible assets               $ 20,209,434   $ 25,798,610 $ 24,348,182
IFETEL [Member]                      
Disclosure of intangible assets and goodwill [line items]                      
Amount paid for license               $ 459,668      
Estimated useful life of intangible assets               20 years 20 years    
Submarine Cable [Member]                      
Disclosure of intangible assets and goodwill [line items]                      
Estimated useful life of intangible assets               10 years 10 years    
Renewal of license [member]                      
Disclosure of intangible assets and goodwill [line items]                      
Amount paid for license               $ 3,457,251      
700 MHz frequency band [member] | Renewal of license [member]                      
Disclosure of intangible assets and goodwill [line items]                      
Amount paid for license                     3,592,034
400 MHZ [Member] | Renewal of license [member]                      
Disclosure of intangible assets and goodwill [line items]                      
Amount paid for license         $ 1,649,525            
Radiomovil dipsa [member] | Eight point four Mega Hertz frequency band [member] | Renewal of license [member]                      
Disclosure of intangible assets and goodwill [line items]                      
Amount paid for license   $ 917,431                  
Radiomovil dipsa [member] | Two point five Giga Hertz frequency band [member] | Renewal of license [member]                      
Disclosure of intangible assets and goodwill [line items]                      
Amount paid for license $ 5,305,498                    
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      
Chile Europe uruguay and other countries [member] | Other licenses [member]                      
Disclosure of intangible assets and goodwill [line items]                      
Amount paid for license                     $ 2,532,088
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