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Financial Instruments - Summary of Financial Assets and Liabilities Measured at Fair Value (Detail) - MXN ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Level 1 [member] |  |
Disclosure of Financial Assets and Financial Liabilities [Line Items] |  |
Financial instrument (current asset) | $ 488 | $ 91
Financial instrument (non-current asset) | 3,002 | 2,880
Financial instrument (current liability) | 83 | 47
Level 2 [member] |  |
Disclosure of Financial Assets and Financial Liabilities [Line Items] |  |
Financial instrument (current asset) | 85 | 917
Financial instrument (non-current asset) | 31,069 | 21,570
Financial instrument (current liability) | 1,045 | 801
Financial instrument (non-current liability) | $ 3,743 | $ 1,672

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