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Summary of Interest Expense - Bank Loans and Notes Payables (Detail)
$ in Millions, $ in Millions
 12 Months Ended
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