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Other Liabilities, Provisions, Contingencies and Commitments - Schedule of Contractual Maturities of the Operating Lease Commitments (Detail)
$ in Millions
Dec. 31, 2018
MXN ($)
Mexican pesos [member]  
Disclosure of financial liabilities [line items]  
Contractual maturities of operating lease commitments $ 69,042
U.S. dollars [member]  
Disclosure of financial liabilities [line items]  
Contractual maturities of operating lease commitments 2,250
Other currencies [member]  
Disclosure of financial liabilities [line items]  
Contractual maturities of operating lease commitments 10,642
Less than 1 year [member] | Mexican pesos [member]  
Disclosure of financial liabilities [line items]  
Contractual maturities of operating lease commitments 7,467
Less than 1 year [member] | U.S. dollars [member]  
Disclosure of financial liabilities [line items]  
Contractual maturities of operating lease commitments 565
Less than 1 year [member] | Other currencies [member]  
Disclosure of financial liabilities [line items]  
Contractual maturities of operating lease commitments 2,085
1-5 years [Member] | Mexican pesos [member]  
Disclosure of financial liabilities [line items]  
Contractual maturities of operating lease commitments 30,691
1-5 years [Member] | U.S. dollars [member]  
Disclosure of financial liabilities [line items]  
Contractual maturities of operating lease commitments 1,485
1-5 years [Member] | Other currencies [member]  
Disclosure of financial liabilities [line items]  
Contractual maturities of operating lease commitments 6,196
Later than 5 years [member] | Mexican pesos [member]  
Disclosure of financial liabilities [line items]  
Contractual maturities of operating lease commitments 30,884
Later than 5 years [member] | U.S. dollars [member]  
Disclosure of financial liabilities [line items]  
Contractual maturities of operating lease commitments 200
Later than 5 years [member] | Other currencies [member]  
Disclosure of financial liabilities [line items]  
Contractual maturities of operating lease commitments $ 2,361