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Financial Instruments - Commodity Price Contracts (Detail) - Coca-Cola FEMSA [member] - Commodity price contracts [Member] - MXN ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Sugar Price Contracts [member] | 0-1 year [member] |  |
Disclosure of detailed information about hedges [line items] |  |
Notional amount | $ 1,260 | $ 1,554
Fair Value Asset | 275 | 53
Fair value Liability | (18) |
Sugar Price Contracts [member] | Second 12 months |  |
Disclosure of detailed information about hedges [line items] |  |
Notional amount | 366 | 98
Fair Value Asset | 70 | 15
Aluminum price contracts [member] | 0-1 year [member] |  |
Disclosure of detailed information about hedges [line items] |  |
Notional amount | 695 | 394
Fair Value Asset | 125 |
Fair value Liability |  | (4)
Aluminum price contracts [member] | Second 12 months |  |
Disclosure of detailed information about hedges [line items] |  |
Notional amount | 99 |
Fair Value Asset | 17 |
PX MEG contracts [member] | 0-1 year [member] |  |
Disclosure of detailed information about hedges [line items] |  |
Notional amount | 729 | 320
Fair value Liability | $ (65) | $ (28)

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