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Financial Instruments - Summary of Other Financial Obligations (Detail) - MXN ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Disclosure of financial liabilities [line items]    
Other financial obligations, short-term $ 19,362 $ 11,658
Other financial obligations, long-term 12,859 25,972
Total 32,221 37,630
Convertible Subordinated Notes Due 2020 [Member]    
Disclosure of financial liabilities [line items]    
Other financial obligations, short-term 0 0
Other financial obligations, long-term 9,985 10,417
Total 9,985 10,417
Convertible subordinated notes due 2018 [member]    
Disclosure of financial liabilities [line items]    
Other financial obligations, short-term 7,115 0
Other financial obligations, long-term 0 13,575
Total 7,115 13,575
Mandatory Convertible Securities 2019 [Member]    
Disclosure of financial liabilities [line items]    
Other financial obligations, short-term 323 278
Other financial obligations, long-term 371 689
Total 694 967
Liabilities Secured With Accounts Receivable [Member]    
Disclosure of financial liabilities [line items]    
Other financial obligations, short-term 11,313 11,095
Other financial obligations, long-term 0 0
Total 11,313 11,095
Finance Leases [Member]    
Disclosure of financial liabilities [line items]    
Other financial obligations, short-term 611 285
Other financial obligations, long-term 2,503 1,291
Total $ 3,114 $ 1,576