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Other Liabilities, Provisions and Commitments - Summary of Other Non-current Financial Liabilities (Detail) - MXN ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Disclosure of financial liabilities [line items]    
Other financial liabilities $ 934 $ 1,897
Derivative financial instruments    
Disclosure of financial liabilities [line items]    
Other financial liabilities 571 1,436
Security deposits    
Disclosure of financial liabilities [line items]    
Other financial liabilities $ 363 $ 461