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Balances and Transactions with Related Parties and Affiliated Companies - Summary of Benefits and Aggregate Compensation Paid to Executive Officers and Senior Management of the Company, Recognized as an Expense During the Reporting Period (Detail) - MXN ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of transactions between related parties [abstract]      
Current compensations and employee benefits $ 815 $ 978 $ 705
Termination benefits 68 186 57
Shared based payments $ 190 $ 188 $ 157