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Financial Instruments - Summary of Financial Assets and Liabilities Measured at Fair Value (Detail) - MXN ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
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Disclosure of Financial Assets and Financial Liabilities [Line Items] |  |
Financial instrument (current asset) | $ 1,008 | $ 735
Financial instrument (non-current asset) | 8,260 | 10,752
Financial instrument (current liability) | 848 | 384
Level 1 [member] |  |
Disclosure of Financial Assets and Financial Liabilities [Line Items] |  |
Financial instrument (current asset) | 91 |
Financial instrument (non-current asset) | 2,880 | 2,680
Financial instrument (current liability) | 47 | 236
Level 2 [member] |  |
Disclosure of Financial Assets and Financial Liabilities [Line Items] |  |
Financial instrument (current asset) | 917 | 735
Financial instrument (non-current asset) | 21,570 | 10,752
Financial instrument (current liability) | 801 | 147
Financial instrument (non-current liability) | $ 1,672 | $ 1,262

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