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Inventories (Details)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2021
MXN ($)
Dec. 31, 2020
MXN ($)
Dec. 31, 2019
MXN ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2021
MXN ($)
Classes of current inventories [abstract]          
Finished products   $ 36,603     $ 40,742
Raw materials   4,756     6,138
Spare parts   1,118     1,109
Work in process   114     960
Inventories in transit   1,443     1,947
Total inventories   44,034   $ 2,481 $ 50,896
Inventory write-downs $ 1,871 2,046 $ 2,992    
Changes in inventories of finished goods and work in progress 246,134 209,410 221,540    
Raw materials and consumables used 85,286 79,896 84,502    
Cost of goods sold, inventories $ 331,420 $ 289,306 $ 306,042