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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
Dec. 31, 2020
MXN ($)
Dec. 31, 2019
MXN ($)
Dec. 31, 2018
MXN ($)
Apr. 26, 2021
Dec. 31, 2020
USD ($)
Disclosure of basis of preparation of consolidated financial statements and summary of significant accounting policies and practices [line items]          
Cumulative index 385.8826        
Percentage of annual basis index 36.10%        
Closing exchange rate 0.2371 0.3147   0.4 0.2371
Cumulative translation (loss) gain $ (160,580,917) $ (199,878,430)     $ (8,049)
Impairment losses on goodwill 0 0 $ 0    
Borrowing costs capitalised 1,771,613 2,233,358 2,020,288    
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%        
Adjustments of sensitivity analysis long-life assets $ 62,548        
Increase in weighted average cost of capital basis 0.50%        
Monthly contributions to pension fund 17.50%        
Percentage of employee profit sharing based on individual company taxable income 10.00%        
Advertising expenses $ 19,894,607 22,810,211 $ 26,255,952    
Increase (decrease) in interest expense $ 628,382,956 $ 624,254,477      
Concentration risk percentage 10.00%       10.00%
Currency depreciation rate       0.40%  
Property, plant and equipment, revalued assets, at cost $ 107,152,628        
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 72.00% 71.00% 73.00%    
Percentage of operating revenue as percentage of total assets 75.00% 73.00%      
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 $ (13,417,231)        
Increase (decrease) in interest expense $ 1,476,660        
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 $ 628,382,956        
Increase (decrease) through changes in foreign exchange rates, regulatory deferral account credit balances 31,429,089        
Increase (decrease) through changes in discount rates, regulatory deferral account credit balances $ (31,429,089)        
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 0.2371 0.3147     0.2371
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 19.9487 18.8452     19.9487
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 $ (100,926,140) $ (87,367,366)      
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