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Income Taxes - Additional Information (Detail)
$ in Millions
 12 Months Ended
Jan. 01, 2018
MXN ($)
Jan. 01, 2017
Apr. 01, 2015
Feb. 01, 2015
Dec. 31, 2018
Dec. 31, 2017
MXN ($)
Dec. 31, 2016
MXN ($)
Dec. 31, 2015
MXN ($)
Dec. 31, 2014
Jan. 01, 2015
MXN ($)
Jan. 01, 2015
USD ($)
Major Components Of Tax Expense Income [Line Items]                      
Effective tax rate           (64.14%) 27.45% 30.91%      
Unrecognized deferred tax liabilities           $ 5,847,000,000 $ 5,136,000,000 $ 8,014,000,000      
NOLs usage limit           30.00%          
Income tax rate           30.00% 30.00% 30.00%      
Excluding Venezuela's Deconsolidation and Philippine's Consolidation Impact [member]                      
Major Components Of Tax Expense Income [Line Items]                      
Effective tax rate           28.12%          
Colombia [member]                      
Major Components Of Tax Expense Income [Line Items]                      
Net equity                   $ 5,000,000,000 $ 2.1
Percentage of tax rate on equity           0.40% 1.00% 1.15%      
Percentage of decrease in income tax rate               8.00%      
Percentage of temporary contribution           8.00% 6.00% 5.00%      
Percentage of income tax deduction               2.00%      
Income tax rate         9.00% 8.00% 6.00% 5.00%      
Percentage of reform income tax rate             35.00%        
Percentage of reform income tax rate   34.00%                  
Percentage of reform extra income tax rate         4.00% 6.00%          
Percentage of special increase in income tax rate           20.00% 15.00%        
Percentage of dividend received from residents withholding           35.00%          
Percentage of dividend received nonresidents withholding           5.00%          
Percentage of increase in income tax rate           3.50% 3.00%        
Value-added tax           19.00% 16.00%        
Colombia [member] | Later than one year [member]                      
Major Components Of Tax Expense Income [Line Items]                      
Percentage of reform income tax rate           33.00%          
Venezuela [member]                      
Major Components Of Tax Expense Income [Line Items]                      
Special tax rate for financial transaction       0.75%              
Guatemala [member]                      
Major Components Of Tax Expense Income [Line Items]                      
Income tax rate               25.00% 28.00%    
Brazil [member]                      
Major Components Of Tax Expense Income [Line Items]                      
Percentage of social contributions on gross revenues on financial income     4.65%                
Average federal production and federal sales tax $ 0.156                    
Argentina [member]                      
Major Components Of Tax Expense Income [Line Items]                      
Income tax rate           35.00%          
Sales taxes           1.75%          
Argentina [member] | Two thousand eighteen and nineteen [member]                      
Major Components Of Tax Expense Income [Line Items]                      
Income tax rate           30.00%          
Percentage of dividend received from residents withholding           7.00%          
Argentina [member] | Two thousand nineteen onwards [member]                      
Major Components Of Tax Expense Income [Line Items]                      
Income tax rate           25.00%          
Percentage of dividend received nonresidents withholding           13.00%          
Argentina [member] | Two thousand and eighteen [member]                      
Major Components Of Tax Expense Income [Line Items]                      
Sales taxes           1.50%          
Argentina [member] | Two thousand and seventeen [member]                      
Major Components Of Tax Expense Income [Line Items]                      
Sales taxes           1.00%          
Argentina [member] | Two Thousand and Nineteen [Member]                      
Major Components Of Tax Expense Income [Line Items]                      
Sales taxes           1.50%          
Argentina [member] | Two thousand and twenty [member]                      
Major Components Of Tax Expense Income [Line Items]                      
Sales taxes           1.00%          
Argentina [member] | Two Thousand and Twenty One [Member]                      
Major Components Of Tax Expense Income [Line Items]                      
Sales taxes           0.50%          
Argentina [member] | Two thousand and twenty two [member]                      
Major Components Of Tax Expense Income [Line Items]                      
Sales taxes           0.00%          
Philippinnes [member]                      
Major Components Of Tax Expense Income [Line Items]                      
Time period for keeping books and accounting records 3 years         10 years          
Philippinnes [member] | Bottom of range [member]                      
Major Components Of Tax Expense Income [Line Items]                      
Percentage of increase in net capital gain tax rate 5.00%                    
Philippinnes [member] | Top of range [member]                      
Major Components Of Tax Expense Income [Line Items]                      
Percentage of increase in net capital gain tax rate 10.00%                    
Philippinnes [member] | Capital gains above $100,000 Philippine pesos [member]                      
Major Components Of Tax Expense Income [Line Items]                      
Income tax rate on net capital gains from sale of shares traded on or outside the stock exchange 15.00%                    
Philippinnes [member] | Without using HFCS [member]                      
Major Components Of Tax Expense Income [Line Items]                      
Excise tax for sweetened beverages 6.00                    
Philippinnes [member] | Using HFCS [member]                      
Major Components Of Tax Expense Income [Line Items]                      
Excise tax for sweetened beverages 12.00                    
Events After Reporting Period [member] | Colombia [member]                      
Major Components Of Tax Expense Income [Line Items]                      
Percentage of temporary contribution         9.00%            
Events After Reporting Period [member] | Brazil [member] | Bottom of range [member]                      
Major Components Of Tax Expense Income [Line Items]                      
Average federal production and federal sales tax for the next year $ 0.160                    
Events After Reporting Period [member] | Brazil [member] | Top of range [member]                      
Major Components Of Tax Expense Income [Line Items]                      
Average federal production and federal sales tax for the next year $ 0.175