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Balances and Transactions in Foreign Currencies - Summary of Balances and Transactions in Foreign Currencies (Detail) $ in Millions | Dec. 31, 2019 USD ($) | Dec. 31, 2019 MXN ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2018 MXN ($)
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Disclosure of Balances and Transactions in Foreign Currencies [line items] |  |  |  |  |  |
Current assets | $ 3,011,000,000 | [1] | $ 56,796 | [2] |  | $ 57,490
Noncurrent assets | 10,660,000,000 | [1] | 201,043 | [2] |  | 206,297
Current liabilities | 2,705,000,000 | [1] | 51,010 | [2] |  | 45,524
Noncurrent liabilities | 4,090,000,000 | [1] | 77,144 | [2] |  | 86,513
U.S. dollars [member] |  |  |  |  |  |
Disclosure of Balances and Transactions in Foreign Currencies [line items] |  |  |  |  |  |
Current assets |  |  | 11,122 |  |  | 14,572
Noncurrent assets |  |  | 93 |  | $ 0 |
Current liabilities |  |  | 2,762 |  |  | 2,985
Noncurrent liabilities |  |  | 37,691 |  |  | 43,411
Euros [member] |  |  |  |  |  |
Disclosure of Balances and Transactions in Foreign Currencies [line items] |  |  |  |  |  |
Current assets | 0 |  |  |  | 0 |
Noncurrent assets | 0 |  |  |  | 0 |
Current liabilities |  |  | $ 49 |  |  | $ 93
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 2.4.1

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