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Financial Instruments - Summary of Sensitivity Analysis of Market Risks (Detail) - Market risk - MXN ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Forward agreement to purchase U.S. Dollar (MXN/USD) |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Change in USD rate | (19.00%) | (9.00%) | (13.00%)
Effect on equity | $ (884) | $ (739) | $ (365)
Profit and loss effect | $ 0 | $ 0 | $ 0
Forward agreement to purchase U.S. Dollar (BRL/USD) |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Change in USD rate | (21.00%) | (13.00%) | (16.00%)
Effect on equity | $ (357) | $ (155) | $ (413)
Profit and loss effect | $ 0 | $ 0 | $ 0
Forward agreement to purchase U.S. Dollar (COP/USD) |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Change in USD rate | (16.00%) | (10.00%) | (12.00%)
Effect on equity | $ (142) | $ (54) | $ (2)
Profit and loss effect | $ 0 | $ 0 | $ 0
Forward agreement to purchase U.S. Dollar (ARS/USD) |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Change in USD rate | (2.00%) | (25.00%) | (27.00%)
Effect on equity | $ (2) | $ (88) | $ (522)
Profit and loss effect | $ 0 | $ 0 | $ 0
Forward agreement to purchase U.S. Dollar (UYU/USD) |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Change in USD rate | (9.00%) | (5.00%) | (8.00%)
Effect on equity | $ (21) | $ (23) | $ (46)
Profit and loss effect | $ 0 | $ 0 | $ 0
Cross currency swaps (USD to MXN) |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Change in USD rate | (19.00%) | (9.00%) | (13.00%)
Effect on equity | $ (5,507) | $ (2,315) | $ (3,130)
Profit and loss effect | $ 0 | $ 0 | $ 0
Cross currency swaps (USD to BRL) |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Change in USD rate | (21.00%) | (13.00%) | (16.00%)
Effect on equity | $ (2,161) | $ (645) | $ (9,068)
Profit and loss effect | 0 | 0 | 0
Sugar price contracts |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Effect on equity | (515) | (255) | (341)
Profit and loss effect | $ 0 | $ 0 | $ 0
Change on sugar Price | (32.00%) | (24.00%) | (30.00%)
Aluminum price contracts |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Profit and loss effect | $ 0 | $ 0 | $ 0
Change in Aluminum price | (16.00%) | (15.00%) | (22.00%)
Change in Aluminum price, effect on equity | $ (289) | $ (1,164) | $ (55)
Options to purchase foreign currency (MXN to USD) |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Change in USD rate | 0.00% | (10.00%) | (13.00%)
Effect on equity | $ 0 | $ (6) | $ (303)
Profit and loss effect | $ 0 | $ 0 | $ 0

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