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Other Liabilities, Provisions, Contingencies and Commitments - Schedule of Contractual Maturities of the Operating Lease Commitments (Detail)
$ in Millions
Dec. 31, 2017
MXN ($)
Mexican pesos [Member]  
Disclosure of financial liabilities [line items]  
Contractual maturities of operating lease commitments $ 57,782
U.S. dollars [member]  
Disclosure of financial liabilities [line items]  
Contractual maturities of operating lease commitments 3,851
Other currencies [member]  
Disclosure of financial liabilities [line items]  
Contractual maturities of operating lease commitments 38,030
Less than 1 year [member] | Mexican pesos [Member]  
Disclosure of financial liabilities [line items]  
Contractual maturities of operating lease commitments 6,553
Less than 1 year [member] | U.S. dollars [member]  
Disclosure of financial liabilities [line items]  
Contractual maturities of operating lease commitments 426
Less than 1 year [member] | Other currencies [member]  
Disclosure of financial liabilities [line items]  
Contractual maturities of operating lease commitments 5,700
1-5 years [Member] | Mexican pesos [Member]  
Disclosure of financial liabilities [line items]  
Contractual maturities of operating lease commitments 21,922
1-5 years [Member] | U.S. dollars [member]  
Disclosure of financial liabilities [line items]  
Contractual maturities of operating lease commitments 3,145
1-5 years [Member] | Other currencies [member]  
Disclosure of financial liabilities [line items]  
Contractual maturities of operating lease commitments 22,104
Later than 5 years [member] | Mexican pesos [Member]  
Disclosure of financial liabilities [line items]  
Contractual maturities of operating lease commitments 29,307
Later than 5 years [member] | U.S. dollars [member]  
Disclosure of financial liabilities [line items]  
Contractual maturities of operating lease commitments 280
Later than 5 years [member] | Other currencies [member]  
Disclosure of financial liabilities [line items]  
Contractual maturities of operating lease commitments $ 10,226