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Financial Instruments - Summarizes Sugar Price and Aluminum Price Contracts (Detail) - MXN ($) | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Disclosure of detailed information about financial instruments [line items] |  |
Fair Value Asset | $ 1,897,000,000 | $ 955,000,000
Cash flow hedges [member] | Sugar price contracts [member] | Later than one year and not later than two years [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Maturity Date | 2019 | 2019
Notional Amount | $ 1,223,000,000 | $ 150,000,000
Fair Value (Liability) | $ (88,000,000) |
Fair Value Asset |  | $ 3,000,000
Cash flow hedges [member] | Sugar price contracts [member] | Not later than one year [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Maturity Date |  | 2018
Notional Amount |  | $ 986,000,000
Fair Value (Liability) |  | (26,000,000)
Fair Value Asset |  | $ 19,000,000
Cash flow hedges [member] | Aluminum price contracts [member] | Later than one year and not later than two years [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Maturity Date | 2019 |
Notional Amount | $ 265,000,000 |
Fair Value (Liability) | $ (17,000,000) |
Cash flow hedges [member] | PX MEG price [member] | Later than one year and not later than two years [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Maturity Date | 2019 |
Notional Amount | $ 1,303,000,000 |
Fair Value (Liability) | $ (131,000,000) |

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