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Financial Instruments - Summary of Net Effects of Expired Contracts Met Hedging Criteria (Detail) $ in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2019 USD ($) | [1] | Dec. 31, 2019 MXN ($) | Dec. 31, 2018 MXN ($) | Dec. 31, 2017 MXN ($)
Disclosure of net effects of expired contracts that met hedging criteria [line items] |  |  |  |  |
Interest expense | $ 366 | $ 6,904 | [2] | $ 7,568 | $ 8,777
Derivatives designated as hedges [member] | Currency swap contract [member] |  |  |  |  |
Disclosure of net effects of expired contracts that met hedging criteria [line items] |  |  |  |  |
Interest expense |  | 199 |  | 157 | 2,102
Foreign exchange |  | 480 |  | 642 | 0
Derivatives designated as hedges [member] | Intrest rate swap [Member] |  |  |  |  |
Disclosure of net effects of expired contracts that met hedging criteria [line items] |  |  |  |  |
Interest expense |  | 515 |  | 0 | 0
Derivatives designated as hedges [member] | Options to purchase foreign currency [member] |  |  |  |  |
Disclosure of net effects of expired contracts that met hedging criteria [line items] |  |  |  |  |
Effects on cost of good sold |  | (63) |  | (8) | 0
Derivatives designated as hedges [member] | Forward agreements to purchase foreign currency [member] |  |  |  |  |
Disclosure of net effects of expired contracts that met hedging criteria [line items] |  |  |  |  |
Effects on cost of good sold |  | (163) |  | 240 | 89
Derivatives designated as hedges [member] | Commodity Price contracts [member] |  |  |  |  |
Disclosure of net effects of expired contracts that met hedging criteria [line items] |  |  |  |  |
Effects on cost of good sold |  | $ (391) |  | $ (258) | $ (6)
[1] | Convenience translation to U.S. dollars ($) – See Note 2.2.3
[2] | The Company initially adopted IFRS 16 on January 1, 2019 using the modified retrospective approach under which the comparative information is not restated. – See Note 2.4.1

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