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Leases - Additional Information (Detail) - MXN ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Presentation of leases for lessee [abstract]      
Interest expenses on lease liabilities $ 105 $ 129  
Expenses for low value assets and short-term leases $ 190 $ 187  
Weighted average incremental borrowing rate 6.58% 7.68%  
Rental expense     $ 1,063