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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

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