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Trade Accounts Receivable, Net - Changes in Allowance for Expected Credit Losses (Details) - Trade accounts receivable - MXN ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Trade Accounts Receivable, Net      
Balance at the beginning of the period $ 2,462 $ 2,189 $ 2,114
Allowance for the period 496 591 709
Additions (write-offs) of uncollectible accounts (821) (613) (269)
Addition from business combinations   273  
Effects of changes in foreign exchange rates (186) 22 (365)
Balance at the end of the period $ 1,951 $ 2,462 $ 2,189