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Bank Loans and Notes Payables - Additional Information (Detail) $ in Millions, $ in Millions |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Nov. 26, 2018 USD ($) | Nov. 26, 2018 MXN ($) | Dec. 31, 2019 MXN ($) | Feb. 15, 2020 | Dec. 31, 2019 USD ($) | Dec. 31, 2019 MXN ($) | Dec. 31, 2018 MXN ($)
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Fixed interest rate |  |  |  |  | 5.46% | 5.46% |
Long-term debt |  |  |  |  |  | $ 69,095 | $ 80,423
Mexico [member] |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Proceeds from bank loan |  |  | $ 9,400 |  |  |  |
Uruguay Colombia And Argentina [Member] |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Proceeds from bank loan |  |  | $ 1,670 |  |  |  |
Top of range [member] |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Fixed interest rate |  |  |  |  | 8.39% | 8.39% |
Bottom of range [member] |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Fixed interest rate |  |  |  |  | 7.91% | 7.91% |
Mexico, Pesos [member] |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  | $ 10,100 |
Repayment of bonds |  | $ 10,100 |  |  |  |  |
Uruguay, Pesos |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  | 1,344 |
United States of America, Dollars [member] |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Repayment of bonds | $ 445 |  |  |  |  |  |
8.27% debt bonds, maturing in 2021 [member] |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Nominal amount |  |  |  |  |  | $ 2,500 |
Maturity date |  |  | 2021 |  |  |  |
Fixed interest rate |  |  |  |  | 8.27% | 8.27% |
5.46% debt bonds maturing in 2023 [member] |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Nominal amount |  |  |  |  |  | $ 7,500 |
Maturity date |  |  | 2023 |  |  |  |
4.63% senior notes, maturity date on Feb. 15, 2020 [member] |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Nominal amount |  |  |  |  | $ 500 |  |
Maturity date |  |  | February 15, 2020 |  |  |  |
Fixed interest rate |  |  |  | 4.625% | 4.63% | 4.63% |
3.88% senior notes, maturity date on Nov. 26, 2023 [member] |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Nominal amount |  |  |  |  | $ 900 |  |
Maturity date |  |  | November 26, 2023 |  |  |  |
Fixed interest rate |  |  |  |  | 3.88% | 3.88% |
5.25% senior notes, maturity date on Nov. 26, 2043 [member] |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Nominal amount |  |  |  |  | $ 600 |  |
Maturity date |  |  | November 26, 2043 |  |  |  |
Fixed interest rate |  |  |  |  | 5.25% | 5.25% |
TIIE + 0.25% Debt Bonds Maturing on 2022 [member] |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Nominal amount |  |  |  |  |  | $ 1,500 |
Maturity date |  |  | 2022 |  |  |  |
Floating interest rate |  |  | 0.25 |  |  |  |
Seven point eight seven percentage debt bonds maturing on two thousand twenty seven [member] |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Nominal amount |  |  |  |  |  | $ 8,500 |
Maturity date |  |  | 2027 |  |  |  |
Fixed interest rate |  |  |  |  | 7.87% | 7.87% |

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