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Leases - Right-of-use assets (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2020
MXN ($)
Dec. 31, 2019
MXN ($)
Disclosure of quantitative information about right-of-use assets [line items]      
Right-of-use assets, beginning   $ 52,684 $ 50,220
Additions   7,982 7,502
Additions from business combinations   1,765 2,187
Disposals   (2,304) (832)
Remeasurements   3,833 2,290
Depreciation   (8,629) (7,893)
Effects of changes in foreign exchange rates and restatement effects associated with hyperinflationary economies   (584) (790)
Right-of-use assets, ending $ 2,752 54,747 52,684
Land and buildings [member]      
Disclosure of quantitative information about right-of-use assets [line items]      
Right-of-use assets, beginning   51,926 49,112
Additions   6,478 7,406
Additions from business combinations   1,414 2,187
Disposals   (2,190) (827)
Remeasurements   3,749 2,299
Depreciation   (8,138) (7,492)
Effects of changes in foreign exchange rates and restatement effects associated with hyperinflationary economies   (475) (759)
Right-of-use assets, ending   52,764 51,926
Other [member]      
Disclosure of quantitative information about right-of-use assets [line items]      
Right-of-use assets, beginning   758 1,108
Additions   1,504 96
Additions from business combinations   351  
Disposals   (114) (5)
Remeasurements   84 (9)
Depreciation   (491) (401)
Effects of changes in foreign exchange rates and restatement effects associated with hyperinflationary economies   (109) (31)
Right-of-use assets, ending   1,983 $ 758
Specialty’s Café & Bakery, Inc [Member]      
Disclosure of quantitative information about right-of-use assets [line items]      
Disposals   $ 690