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Balances and Transactions in Foreign Currencies - Summary of Balances and Transactions in Foreign Currencies (Detail) € in Millions, $ in Millions, $ in Millions | Dec. 31, 2020 USD ($) | Dec. 31, 2020 MXN ($) | Dec. 31, 2020 EUR (€) | Dec. 31, 2019 USD ($) | Dec. 31, 2019 MXN ($) | [2] | Dec. 31, 2019 EUR (€)
--- | --- | --- | --- | --- | --- | --- | ---
Disclosure of Balances and Transactions in Foreign Currencies [line items] |  |  |  |  |  |  |
Current assets | $ 3,642 | [1] | $ 72,440 |  |  | $ 56,796 |
Noncurrent assets | 9,583 | [1] | 190,626 |  |  | 201,043 |
Current liabilities | 2,154 | [1] | 42,845 |  |  | 51,010 |
Noncurrent liabilities | 4,915 | [1] | $ 97,764 |  |  | $ 77,144 |
U.S. dollars |  |  |  |  |  |  |
Disclosure of Balances and Transactions in Foreign Currencies [line items] |  |  |  |  |  |  |
Current assets | $ | 21,787 |  |  |  | $ 11,122 |  |
Noncurrent assets | $ | 4 |  |  |  | 93 |  |
Current liabilities | $ | 2,645 |  |  |  | 2,762 |  |
Noncurrent liabilities | $ | $ 50,969 |  |  |  | $ 37,691 |  |
Euros |  |  |  |  |  |  |
Disclosure of Balances and Transactions in Foreign Currencies [line items] |  |  |  |  |  |  |
Current assets | € |  |  |  | € 0 |  |  | € 0
Noncurrent assets | € |  |  |  | 0 |  |  | 0
Current liabilities | € |  |  |  | 95 |  |  | 49
Noncurrent liabilities | € |  |  |  | € 0 |  |  | € 0
[1] | Convenience translation to U.S. dollars ($) – See Note 2.2.3
[2] | The Company initially adopted IFRS 16 on January 1, 2019 using the modified retrospective approach under which the comparative information is not restated. – See Note 3.18

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