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Financial Instruments - Summary of Sensitivity Analysis of Market Risks (Detail) - Market risk [member] - MXN ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Forward agreements to purchase USD (MXN/USD) [member] |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Change in U.S. $ Rate | (9.00%) | (13.00%) | (12.00%)
Effect on Equity | $ (739) | $ (365) | $ (602)
Profit and loss effect | $ 0 | $ 0 | $ 0
Forward agreements to purchase USD (BRL/USD) [member] |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Change in U.S. $ Rate | (13.00%) | (16.00%) | (14.00%)
Effect on Equity | $ (155) | $ (413) | $ (234)
Profit and loss effect | $ 0 | $ 0 | $ 0
Forward agreements to purchase USD (COP/USD) [member] |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Change in U.S. $ Rate | (10.00%) | (12.00%) | (9.00%)
Effect on Equity | $ (54) | $ (2) | $ (73)
Profit and loss effect | $ 0 | $ 0 | $ 0
Forward agreements to purchase USD (ARS/USD) [member] |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Change in U.S. $ Rate | (25.00%) | (27.00%) |
Effect on Equity | $ (88) | $ (522) |
Profit and loss effect | $ 0 | $ 0 |
Forward agreements to purchase USD (UYU/USD) [member] |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Change in U.S. $ Rate | (5.00%) | (8.00%) |
Effect on Equity | $ (23) | $ (46) |
Profit and loss effect | $ 0 | $ 0 |
Cross currency swaps (USD into MXN) [member] |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Change in U.S. $ Rate | (9.00%) | (13.00%) | (12.00%)
Effect on Equity | $ (2,315) | $ (3,130) | $ (3,540)
Profit and loss effect | $ 0 | $ 0 | $ 0
Cross currency swaps (USD into BRL) [member] |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Change in U.S. $ Rate | (13.00%) | (16.00%) | (14.00%)
Effect on Equity | $ (645) | $ (9,068) | $ (7,483)
Profit and loss effect | 0 | 0 | 0
Sugar price contracts [member] |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Effect on Equity | $ (255) | (341) | (32)
Profit and loss effect |  | $ 0 | $ 0
Change on sugar Price | (24.00%) | (30.00%) | (30.00%)
Profit and loss effect | $ 0 |  |
Aluminum price contracts [member] |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Profit and loss effect |  | $ 0 | $ 0
Change in Aluminum price | (15.00%) | (22.00%) | (16.00%)
Effect on Equity | $ (1,164) | $ (55) | $ (13)
Effect on Profit or Loss | $ 0 |  |
Options to purchase foreign currency (MXN/USD) [member] |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Change in U.S. $ Rate | (10.00%) | (13.00%) |
Effect on Equity | $ (6) | $ (303) |
Profit and loss effect | $ 0 | $ 0 |
Interest rate swaps float into fix rates [member] |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Change in BRL Rates | (1.00%) | (1.00%) |
Effect on Equity | $ (37) | $ (1,976) |
Profit and loss effect | $ 0 | $ 0 |

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