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Balances and Transactions in Foreign Currencies - Transactions (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2020
MXN ($)
Dec. 31, 2019
MXN ($)
Dec. 31, 2018
MXN ($)
Disclosure of Balances and Transactions in Foreign Currencies [line items]        
Raw materials and consumables used   $ 79,896 $ 84,502 $ 79,825
Interest expense $ 881 17,516 14,133 9,825
All Currencies Other Than Peso [Member]        
Disclosure of Balances and Transactions in Foreign Currencies [line items]        
Total revenue   4,338 5,488 7,228
Other operating revenues   1,530 6,594 139
Raw materials and consumables used   16,436 18,479 21,523
Interest expense   14,192 2,580 2,743
Consulting Fees   503 753 774
Asset Acquisitions   79 3,393 2,166
Other   2,517 4,482 2,677
USD        
Disclosure of Balances and Transactions in Foreign Currencies [line items]        
Total revenue   4,213 5,487 7,228
Other operating revenues   1,478 5,612 130
Raw materials and consumables used   16,398 17,941 21,460
Interest expense   13,660 2,183 2,309
Consulting Fees   480 718 752
Asset Acquisitions   79 3,388 2,166
Other   2,413 4,348 2,676
Euro [member]        
Disclosure of Balances and Transactions in Foreign Currencies [line items]        
Raw materials and consumables used   35 538 63
Interest expense     397 434
Consulting Fees   20 33 20
Asset Acquisitions     5  
Other   1 2 1
Other currencies [member]        
Disclosure of Balances and Transactions in Foreign Currencies [line items]        
Total revenue   125 1  
Other operating revenues   52 982 9
Raw materials and consumables used   3    
Interest expense   532    
Consulting Fees   3 2 $ 2
Other   $ 103 $ 132