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Financial Instruments - Summary of Other Financial Obligations (Detail) - MXN ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Disclosure of financial liabilities [line items]    
Other financial obligations, short-term $ 12,739 $ 19,362
Other financial obligations, long-term 12,028 12,859
Total 24,767 32,221
Convertible Subordinated Notes Due 2020 [Member]    
Disclosure of financial liabilities [line items]    
Other financial obligations, short-term 0 0
Other financial obligations, long-term 10,097 9,985
Total 10,097 9,985
Convertible subordinated notes due 2018 [member]    
Disclosure of financial liabilities [line items]    
Other financial obligations, short-term 0 7,115
Other financial obligations, long-term 0 0
Total 0 7,115
Mandatory Convertible Securities 2019 [Member]    
Disclosure of financial liabilities [line items]    
Other financial obligations, short-term 374 323
Other financial obligations, long-term 0 371
Total 374 694
Liabilities Secured With Accounts Receivable [member]    
Disclosure of financial liabilities [line items]    
Other financial obligations, short-term 11,770 11,313
Other financial obligations, long-term 0 0
Total 11,770 11,313
Finance Leases [member]    
Disclosure of financial liabilities [line items]    
Other financial obligations, short-term 595 611
Other financial obligations, long-term 1,931 2,503
Total $ 2,526 $ 3,114