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Bank Loans and Notes Payables - Summary of Reconciliation of Liabilities Arising From Financing Activities (Parenthetical) (Detail) $ in Millions, $ in Millions | Dec. 31, 2018 MXN ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 MXN ($)
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Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |
Current portion of long term debt | $ 10,222 | $ 521 | $ 10,114
Brazil, Brazil Real [member] |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |
Current portion of long term debt | 5 |  |
Notes payable [member] | Brazil, Brazil Real [member] |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |
Current portion of long term debt | 4,653 |  | 10
Bank loans [member] | Brazil, Brazil Real [member] |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |
Current portion of long term debt | 430 |  | 602
Bank loans [member] | Colombia, Pesos [member] |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |
Current portion of long term debt | 424 |  | 728
Bank loans [member] | Mexico, Pesos [member] |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |
Current portion of long term debt | 4,700 |  |
Finance leasing [member] | Uruguay, Pesos |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |
Financial leasing | $ 10 |  |
Senior notes 1 [member] | United States of America, Dollars [member] |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |
Current portion of long term debt |  |  | $ 8,774

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