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Bank Loans and Notes Payable - Interest Expense (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2020
MXN ($)
Dec. 31, 2019
MXN ($)
Dec. 31, 2018
MXN ($)
Disclosure of detailed information about borrowings [abstract]        
Interest on debts and borrowings   $ 10,788 $ 6,434 $ 6,760
Capitalized interest       (5)
Finance charges for employee benefits   456 382 373
Derivative instruments   1,428 2,300 2,649
Finance operating charges   (231) 243 48
Finance charges payable for leases   5,075 4,774  
Total $ 881 $ 17,516 $ 14,133 $ 9,825