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Financial Instruments - Summary of Financial Assets and Liabilities Measured at Fair Value (Detail) - MXN ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018
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Level 1 [member] |  |
Disclosure of Financial Assets and Financial Liabilities [Line Items] |  |
Derivative financial instrument (current asset) | $ 27 |
Derivative financial instrument (current liability) | 201 | $ 236
Level 2 [member] |  |
Disclosure of Financial Assets and Financial Liabilities [Line Items] |  |
Derivative financial instrument (current asset) | 770 | 735
Derivative financial instrument (non-current asset) | 9,807 | 10,752
Derivative financial instrument (current liability) | 352 | 147
Derivative financial instrument (non-current liability) | $ 2,243 | $ 1,262

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