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Financial Instruments - Summary of Financial Assets and Liabilities Measured at Fair Value (Detail) - MXN ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Disclosure of Financial Assets and Financial Liabilities [Line Items] |  |
Derivative financial instrument (current asset) | $ 735 | $ 233
Derivative financial instrument (non-current asset) | 10,752 | 10,137
Derivative financial instrument (current liability) | 384 | 3,947
Level 1 [member] |  |
Disclosure of Financial Assets and Financial Liabilities [Line Items] |  |
Derivative financial instrument (current asset) |  | 22
Derivative financial instrument (current liability) | 236 | 26
Level 2 [member] |  |
Disclosure of Financial Assets and Financial Liabilities [Line Items] |  |
Derivative financial instrument (current asset) | 735 | 211
Derivative financial instrument (non-current asset) | 10,752 | 10,137
Derivative financial instrument (current liability) | 147 | 3,921
Derivative financial instrument (non-current liability) | $ 1,262 | $ 1,769

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