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Basis of Preparation of the Consolidated Financial Statements and Summary of Significant Accounting Policies and Practices - Additional Information (Detail)
$ in Thousands, $ in Millions
 12 Months Ended
Nov. 23, 2021
MXN ($)
shares
Nov. 23, 2021
USD ($)
shares
Dec. 31, 2021
MXN ($)
Dec. 31, 2020
MXN ($)
Dec. 31, 2019
MXN ($)
Dec. 31, 2018
Dec. 31, 2021
USD ($)
Sep. 14, 2020
Disclosure of basis of preparation of consolidated financial statements and summary of significant accounting policies and practices [line items]                
Cumulative index     582.4575          
Percentage of annual basis index     50.90%          
Closing exchange rate     0.2004 0.2371     0.2004  
Cumulative translation (loss) gain     $ (154,388,931) $ (160,580,917)     $ (7,502.0)  
Impairment losses on goodwill     0 0 $ 0      
Borrowing costs capitalised     1,527,259 1,771,613 2,233,358      
Impairment losses     0 0 0      
Impairment losses on intangibles     $ 0 0 0      
Description of estimation of impairment cash-generating unit     In the estimation of impairments, the Company uses the strategic plans established for the separate cash-generating units to which the assets are assigned. Such strategic plans generally cover a period from 3 to 5 years. For longer periods, beginning in the fifth year, projections are based on such strategic plans while applying a constant or declining expected perpetual growth rate.          
Percentage of sensitivity analysis for increase in capital expenditures     5.00%          
Monthly contributions to pension fund     17.50%          
Percentage of employee profit sharing based on individual company taxable income     10.00%          
Advertising expenses     $ 12,018,536 11,157,495 $ 13,100,877      
Increase (decrease) in interest expense     $ 564,030,102 628,382,956        
Concentration risk percentage     10.00%       10.00%  
Equity investments at fair value through other comprehensive income (OCI)       $ 4,540,344        
Foreign subsidiaries [member]                
Disclosure of basis of preparation of consolidated financial statements and summary of significant accounting policies and practices [line items]                
Consolidated operating revenues     64.00% 66.00% 65.00%      
Percentage of operating revenue as percentage of total assets     70.00% 75.00%        
Tracfone Wireless Inc Tracfone [member] | Verizon Communications Inc [Member]                
Disclosure of basis of preparation of consolidated financial statements and summary of significant accounting policies and practices [line items]                
Percentage of ownership interest in subsidiary agreed to sell               100.00%
Tracfone Wireless Inc Tracfone [member] | Verizon Communications Inc [Member] | Discontinued operations [member]                
Disclosure of basis of preparation of consolidated financial statements and summary of significant accounting policies and practices [line items]                
Percentage of ownership interest in subsidiary sold   100.00%            
Proceeds from sale of Subsidiary   $ 3,625.7            
Cash and cash equivalents in subsidiary or businesses acquired or disposed   $ 500.7            
Shares received on sale of subsidiary from Counterparty | shares 57,596,544 57,596,544            
Value of Shares received on sale of subsidiary from Counterparty   $ 2,968.0            
Earntout contingent consideration receivable tranche one   500.0            
Earntout contingent consideration receivable tranche two   $ 150.0            
Gains (losses) recognised when control of subsidiary is lost $ 106,527,287              
Interest rate risk [member]                
Disclosure of basis of preparation of consolidated financial statements and summary of significant accounting policies and practices [line items]                
Increase in basis points     1.00%          
Increase in net interest expense     $ (14,606,005)          
Increase (decrease) in interest expense     $ (1,188,821)          
Currency risk [member]                
Disclosure of basis of preparation of consolidated financial statements and summary of significant accounting policies and practices [line items]                
Fluctuation in exchange rates     5.00%       5.00%  
Increase (decrease) in interest expense     $ 564,030,102          
Increase (decrease) through changes in foreign exchange rates, regulatory deferral account credit balances     28,394,119          
Increase (decrease) through changes in discount rates, regulatory deferral account credit balances     $ (28,019,972)          
Increase/(decrease) in exchange rates     5.00%          
Argentina [member]                
Disclosure of basis of preparation of consolidated financial statements and summary of significant accounting policies and practices [line items]                
Closing exchange rate     0.2004 0.2371     0.2004  
Argentina [member] | Impact of application of hyperinflation adjustments in 2018 [member]                
Disclosure of basis of preparation of consolidated financial statements and summary of significant accounting policies and practices [line items]                
Cumulative inflation percentage           100.00%    
U.S.A. [member]                
Disclosure of basis of preparation of consolidated financial statements and summary of significant accounting policies and practices [line items]                
Closing exchange rate     20.5835 19.9487     20.5835  
Cumulative translation adjustment [member]                
Disclosure of basis of preparation of consolidated financial statements and summary of significant accounting policies and practices [line items]                
Cumulative translation (loss) gain     $ (104,270,295) $ (100,926,140)        
Licenses and rights of use [member]                
Disclosure of basis of preparation of consolidated financial statements and summary of significant accounting policies and practices [line items]                
Intangibles useful life     Licenses are amortized when the Company does not have a basis to conclude that they are indefinite lived. Licenses are amortized using the straight-line method over a period ranging from 3 to 30 years, which represents the usage period of the assets.          
Licenses and rights of use [member] | Bottom of range [member]                
Disclosure of basis of preparation of consolidated financial statements and summary of significant accounting policies and practices [line items]                
Estimated useful lives     3 years          
Licenses and rights of use [member] | Top of range [member]                
Disclosure of basis of preparation of consolidated financial statements and summary of significant accounting policies and practices [line items]                
Estimated useful lives     30 years          
Trademarks [member] | Bottom of range [member]                
Disclosure of basis of preparation of consolidated financial statements and summary of significant accounting policies and practices [line items]                
Estimated useful lives     1 year          
Trademarks [member] | Top of range [member]                
Disclosure of basis of preparation of consolidated financial statements and summary of significant accounting policies and practices [line items]                
Estimated useful lives     10 years          
Customer relationships [member]                
Disclosure of basis of preparation of consolidated financial statements and summary of significant accounting policies and practices [line items]                
Intangibles useful life     amortized over a 5-year period.          
Estimated useful lives     5 years