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Inventories (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2020
MXN ($)
Dec. 31, 2019
MXN ($)
Dec. 31, 2018
MXN ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2020
MXN ($)
Classes of current inventories [abstract]          
Finished products   $ 32,853     $ 36,603
Raw materials   5,331     4,756
Spare parts   1,198     1,118
Work in process   113     114
Inventories in transit   1,528     1,443
Total inventories   41,023   $ 2,214 $ 44,034
Inventory write-downs $ 2,046 2,992 $ 2,006    
Changes in inventories of finished goods and work in progress 209,410 221,540 204,688    
Raw materials and consumables used 79,896 84,502 79,825    
Cost of goods sold, inventories $ 289,306 $ 306,042 $ 284,513