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Summary of Interest Expense - Bank Loans and Notes Payables (Detail) $ in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2020 USD ($) | [1] | Dec. 31, 2020 MXN ($) | Dec. 31, 2019 MXN ($) | Dec. 31, 2018 MXN ($)
Disclosure of detailed information about borrowings [abstract] |  |  |  |  |
Interest on debts and borrowings |  | $ 6,228 | $ 4,459 |  | $ 4,786
Finance charges for employee benefits |  | 231 | 200 |  | 202
Derivative instruments |  | 1,174 | 1,946 |  | 2,370
Finance charges of leases |  | 105 | 129 |  | 0
Finance operating charges |  | 156 | 170 |  | 210
Interest Expense | $ 397 | $ 7,894 | $ 6,904 | [2] | $ 7,568
[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 3.18

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