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Leases - Right-of-use assets (Details)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2021
USD ($)
Dec. 31, 2021
MXN ($)
Dec. 31, 2020
MXN ($)
Leases      
Right-of-use assets, beginning   $ 54,747 $ 52,684
Additions   7,871 7,982
Additions from business combinations   1,540 1,765
Disposals   (1,371) (2,304)
Remeasurements   3,964 3,833
Depreciation   (8,960) (8,629)
Effects of changes in foreign exchange rates and restatement effects associated with hyperinflationary economies   (797) (584)
Right-of-use assets, ending $ 2,778 56,994 54,747
Land and buildings      
Leases      
Right-of-use assets, beginning   52,764 51,926
Additions   7,485 6,478
Additions from business combinations   1,440 1,414
Disposals   (1,337) (2,190)
Remeasurements   3,776 3,749
Depreciation   (8,363) (8,138)
Effects of changes in foreign exchange rates and restatement effects associated with hyperinflationary economies   (821) (475)
Right-of-use assets, ending   54,944 52,764
Other PPE      
Leases      
Right-of-use assets, beginning   1,983 758
Additions   386 1,504
Additions from business combinations   100 351
Disposals   (34) (114)
Remeasurements   188 84
Depreciation   (597) (491)
Effects of changes in foreign exchange rates and restatement effects associated with hyperinflationary economies   24 (109)
Right-of-use assets, ending   $ 2,050 1,983
Specialty's Caf & Bakery, Inc      
Leases      
Disposals     $ 690