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Financial Instruments - Summary of Other Financial Obligations (Detail) - MXN ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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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

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