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Basis of Preparation of the Consolidated Financial Statements and Summary of Significant Accounting Policies and Practices - Additional Information (Detail)
$ in Millions
 12 Months Ended
Jan. 01, 2018
MXN ($)
Dec. 31, 2018
MXN ($)
Segment
Dec. 31, 2017
MXN ($)
Dec. 31, 2016
MXN ($)
Apr. 09, 2019
Dec. 31, 2018
USD ($)
Disclosure of basis of preparation of consolidated financial statements and summary of significant accounting policies and practices [line items]            
Impairment on trade receivables $ 2,400,783,000          
Impairment losses that impacted the carrying amount of debt instruments at fair value through OCI $ 0          
Cumulative index   184.255        
Percentage of annual basis index   48.00%        
Closing exchange rate   0.5221       0.5221
Cumulative translation (loss) gain   $ (137,598,218,000) $ (73,261,794,000)     $ (6,990)
Impairment losses on goodwill   0 0 $ 0    
Borrowing costs capitalised   2,020,288,000 2,875,034,000 2,861,307,000    
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   $ 1,558,823,000        
Increase in weighted average cost of capital basis   0.50%        
Adjustments for assumption of weighted average cost of capital   $ 1,135,854,000        
Monthly contributions to pension fund   17.50%        
Percentage of employee profit sharing based on individual company taxable income   10.00%        
Advertising expenses   $ 26,255,952,000 28,718,563,000 $ 28,180,538,000    
Increase (decrease) in interest expense   $ 638,922,453,000 $ 697,884,899,000      
Concentration risk percentage   10.00%       10.00%
Number of segments | Segment   0        
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   73.00% 74.00% 72.00%    
Percentage of operating revenue as percentage of total assets   80.00% 81.00%      
Cost of sales [member]            
Disclosure of basis of preparation of consolidated financial statements and summary of significant accounting policies and practices [line items]            
Employee benefits expense   $ 47,671,143,000 $ 48,696,331,000 $ 46,759,415,000    
Commercial, administrative and general expenses [member]            
Disclosure of basis of preparation of consolidated financial statements and summary of significant accounting policies and practices [line items]            
Employee benefits expense   $ 67,936,876,000 $ 66,920,537,000 $ 63,691,855,000    
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   $ 32,136,984,000        
Increase (decrease) in interest expense   $ (31,773,439,000)        
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   $ 638,922,453,000        
Increase (decrease) through changes in foreign exchange rates, regulatory deferral account credit balances   3,165,958,000        
Increase (decrease) through changes in discount rates, regulatory deferral account credit balances   $ (10,940,798,000)        
Increase/(decrease) in exchange rates   5.00%        
Bottom of range [member]            
Disclosure of basis of preparation of consolidated financial statements and summary of significant accounting policies and practices [line items]            
Term of selling equipment under financing model   12 months        
Top of range [member]            
Disclosure of basis of preparation of consolidated financial statements and summary of significant accounting policies and practices [line items]            
Term of selling equipment under financing model   36 months        
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         18.9701  
Argentina [member]            
Disclosure of basis of preparation of consolidated financial statements and summary of significant accounting policies and practices [line items]            
Closing exchange rate   0.5221 1.0610     0.5221
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%        
Cumulative inflation period   3 years        
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   19.6829 19.7867     19.6829
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   $ (53,357,300,000) $ 7,866,158,000      
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 on a 5 year period.        
Estimated useful lives   5 years