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Other Liabilities, Provisions and Commitments - Additional Information (Detail) - MXN ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of contingent liabilities [line items]      
Aggregate amount claimed against company $ 64,558    
Tax contingencies amount 51,014    
Rental expense 1,420 $ 1,232 $ 1,044
Commitments for the Purchase of property, plant and equipment 933    
Brazil [member]      
Disclosure of contingent liabilities [line items]      
Litigation amount 9,433 $ 8,093 $ 3,569
Value added tax [member]      
Disclosure of contingent liabilities [line items]      
Tax contingencies amount 12,346    
Value added tax [member] | State of Sao Paulo [member]      
Disclosure of contingent liabilities [line items]      
Tax contingencies amount 664    
Tax credits [member]      
Disclosure of contingent liabilities [line items]      
Tax contingencies amount 33,217    
Federal taxes [member]      
Disclosure of contingent liabilities [line items]      
Tax contingencies amount $ 4,787