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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 |

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