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Income Taxes - Summary of Temporary Differences Giving Rise to Deferred Income Tax Liabilities (Assets) (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2017
MXN ($)
Dec. 31, 2016
MXN ($)
Dec. 31, 2015
MXN ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2014
MXN ($)
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]          
Deferred tax, asset $ (8,012) $ (5,981)   $ (408)  
Deferred tax, liability 1,714 1,205   $ 87  
Deferred income tax related to consolidated statement of financial position (6,298) (4,776) $ (2,975)   $ (1,871)
Deferred income tax related to consolidated statement of income (1,763) (4,646) (1,509)    
Allowance for doubtful accounts [member]          
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]          
Deferred income tax related to consolidated statement of financial position (119) (148)      
Deferred income tax related to consolidated statement of income 16 (8) 2    
Inventory [member]          
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]          
Deferred income tax related to consolidated statement of financial position (4) (14)      
Deferred income tax related to consolidated statement of income 10 (163) (15)    
Prepaid expenses [member]          
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]          
Deferred income tax related to consolidated statement of financial position 17 13      
Deferred income tax related to consolidated statement of income 5 (71) 7    
Property, plant and equipment [member]          
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]          
Deferred income tax related to consolidated statement of financial position (244) 1,599      
Deferred income tax related to consolidated statement of income (2,071) 1,439 (96)    
Other assets [member]          
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]          
Deferred income tax related to consolidated statement of financial position (569) (403)      
Deferred income tax related to consolidated statement of income (166) 167 41    
Finite useful lived intangible assets [member]          
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]          
Deferred income tax related to consolidated statement of financial position 820 56      
Deferred income tax related to consolidated statement of income 761 (289) 112    
Indefinite lived intangible assets 1 [member]          
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]          
Deferred income tax related to consolidated statement of financial position 2,143 1,458      
Deferred income tax related to consolidated statement of income 743 5,280 (26)    
Post employment and other long term employee benefits [member]          
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]          
Deferred income tax related to consolidated statement of financial position (474) (229)      
Deferred income tax related to consolidated statement of income (196) (1) 115    
Derivative financial instruments [member]          
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]          
Deferred income tax related to consolidated statement of financial position 42 86      
Deferred income tax related to consolidated statement of income (44) 62 22    
Contingencies [member]          
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]          
Deferred income tax related to consolidated statement of financial position (2,629) (1,822)      
Deferred income tax related to consolidated statement of income (807) (96) (7)    
Employee profit sharing payable [member]          
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]          
Deferred income tax related to consolidated statement of financial position (159) (166)      
Deferred income tax related to consolidated statement of income 6 (14) (3)    
Tax loss carry forwards [member]          
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]          
Deferred income tax related to consolidated statement of financial position (8,088) (8,101)      
Deferred income tax related to consolidated statement of income (13) (1,834) (2,230)    
Tax credits to recover [member]          
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]          
Deferred income tax related to consolidated statement of financial position (2,308) (1,150)      
Deferred income tax related to consolidated statement of income (705) (1,150)      
Accumulated other comprehensive income [member]          
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]          
Deferred income tax related to consolidated statement of financial position (141) 84      
Deferred income tax related to consolidated statement of income (224)        
Deductible tax goodwill of business acquisition [member]          
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]          
Deferred income tax related to consolidated statement of financial position   160      
Deferred income tax related to consolidated statement of income (160) (1,921) 1,378    
Liabilities of amortization of goodwill of business acquisition [member]          
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]          
Deferred income tax related to consolidated statement of financial position 5,527 5,921      
Deferred income tax related to consolidated statement of income (394) 45 (32)    
Other liabilities [member]          
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]          
Deferred income tax related to consolidated statement of financial position (112) (2,120)      
Deferred income tax related to consolidated statement of income $ 1,476 $ (6,092) $ (777)