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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, 2019
MXN ($)
Dec. 31, 2018
MXN ($)
Dec. 31, 2017
MXN ($)
Apr. 24, 2020
Dec. 31, 2019
USD ($)
Jan. 01, 2019
MXN ($)
Disclosure of basis of preparation of consolidated financial statements and summary of significant accounting policies and practices [line items]            
Weighted Average Lessees Incremental Borrowing Rate 7.29%       7.29%  
Cumulative index 283.444          
Percentage of annual basis index 53.83%          
Closing exchange rate 0.3147 0.5221     0.3147  
Cumulative translation (loss) gain $ (199,878,430) $ (137,598,218)     $ (10,605)  
Impairment losses on goodwill 0 0 $ 0      
Borrowing costs capitalised 2,233,358 2,020,288 2,875,034      
Impairment losses 0 0 0      
Impairment losses on intangibles $ 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 $ 2,129,800          
Increase in weighted average cost of capital basis 0.50%          
Adjustments for assumption of weighted average cost of capital $ 1,819,169          
Monthly contributions to pension fund 17.50%          
Percentage of employee profit sharing based on individual company taxable income 10.00%          
Advertising expenses $ 22,810,211 26,255,952 $ 28,718,563      
Increase (decrease) in interest expense $ 624,254,477 638,922,453        
Concentration risk percentage 10.00%       10.00%  
Right fo use asset $ 118,003,223 $ 0     $ 6,262  
Lease liability $ 120,596,733         $ 119,387,660
Currency depreciation rate 30.50%       30.50%  
IFRS16 [member]            
Disclosure of basis of preparation of consolidated financial statements and summary of significant accounting policies and practices [line items]            
Right fo use asset $ 119,387,660          
Lease liability $ 119,387,660          
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 71.00% 73.00% 74.00%      
Percentage of operating revenue as percentage of total assets 73.00% 80.00%        
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 $ 3,674,609          
Increase (decrease) in interest expense $ (11,393,767)          
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 $ 624,254,477          
Increase (decrease) through changes in foreign exchange rates, regulatory deferral account credit balances 31,391,368          
Increase (decrease) through changes in discount rates, regulatory deferral account credit balances $ (31,051,093)          
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 0.3147 0.5221     0.3147  
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 18.8452 19.6829   24.5883 18.8452  
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 $ (87,367,366) $ (53,357,300)        
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