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Other Liabilities, Provisions and Commitments - Summary of Contractual Maturities of Operating Lease Commitments (Detail)
$ in Millions
Dec. 31, 2017
MXN ($)
Mexican pesos [Member]  
Disclosure of maturity analysis of operating lease payments [line items]  
Contractual maturities of operating lease commitments $ 740
Mexican pesos [Member] | 2018 [member]  
Disclosure of maturity analysis of operating lease payments [line items]  
Contractual maturities of operating lease commitments 106
Mexican pesos [Member] | Later than 1 year and not later than 5 years [member]  
Disclosure of maturity analysis of operating lease payments [line items]  
Contractual maturities of operating lease commitments 423
Mexican pesos [Member] | Later than 5 years [member]  
Disclosure of maturity analysis of operating lease payments [line items]  
Contractual maturities of operating lease commitments 211
U.S. dollars [member]  
Disclosure of maturity analysis of operating lease payments [line items]  
Contractual maturities of operating lease commitments 990
U.S. dollars [member] | 2018 [member]  
Disclosure of maturity analysis of operating lease payments [line items]  
Contractual maturities of operating lease commitments 103
U.S. dollars [member] | Later than 1 year and not later than 5 years [member]  
Disclosure of maturity analysis of operating lease payments [line items]  
Contractual maturities of operating lease commitments 682
U.S. dollars [member] | Later than 5 years [member]  
Disclosure of maturity analysis of operating lease payments [line items]  
Contractual maturities of operating lease commitments 205
Other currencies [member]  
Disclosure of maturity analysis of operating lease payments [line items]  
Contractual maturities of operating lease commitments 1
Other currencies [member] | 2018 [member]  
Disclosure of maturity analysis of operating lease payments [line items]  
Contractual maturities of operating lease commitments $ 1