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Balances and Transactions in Foreign Currencies - Transactions (Details)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2021
USD ($)
Dec. 31, 2021
MXN ($)
Dec. 31, 2020
MXN ($)
Dec. 31, 2019
MXN ($)
Disclosure of Balances and Transactions in Foreign Currencies [line items]        
Raw materials and consumables used   $ 85,286 $ 79,896 $ 84,502
Interest expense $ 826 16,938 17,516 14,133
All Currencies Other Than Peso        
Disclosure of Balances and Transactions in Foreign Currencies [line items]        
Total revenue   4,282 4,338 5,488
Other operating revenues   2,121 1,530 6,594
Raw materials and consumables used   20,090 16,436 18,479
Interest expense   4,837 14,192 2,580
Consulting Fees   843 503 753
Asset Acquisitions   188 79 3,393
Other   2,973 2,517 4,482
U S dollar        
Disclosure of Balances and Transactions in Foreign Currencies [line items]        
Total revenue   4,261 4,213 5,487
Other operating revenues   2,107 1,478 5,612
Raw materials and consumables used   20,009 16,398 17,941
Interest expense   3,466 13,660 2,183
Consulting Fees   826 480 718
Asset Acquisitions   180 79 3,388
Other   2,908 2,413 4,348
Euro        
Disclosure of Balances and Transactions in Foreign Currencies [line items]        
Total revenue   14    
Raw materials and consumables used   81 35 538
Interest expense   1,371 0 397
Consulting Fees   16 20 33
Asset Acquisitions   8   5
Other   1 1 2
Other currencies        
Disclosure of Balances and Transactions in Foreign Currencies [line items]        
Total revenue   7 125 1
Other operating revenues   14 52 982
Raw materials and consumables used     3  
Interest expense     532  
Consulting Fees   1 3 2
Other   $ 64 $ 103 $ 132