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Bank Loans and Notes Payables - Additional Information (Detail) € in Millions, $ in Millions, $ in Millions |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Aug. 18, 2017 USD ($) | Mar. 14, 2016 EUR (€) | Dec. 31, 2017 MXN ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 MXN ($) | Dec. 31, 2015 MXN ($) | Dec. 31, 2017 USD ($)
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Losses on exchange differences on translation of foreign operations, net of tax |  |  | $ 14,482 | $ 737 | [1] | $ 30,763 | $ (2,234) |
Borrowings |  |  | 128,518 |  |  | $ 137,336 |  |
Ireland [member] |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Losses on exchange differences on translation of foreign operations, net of tax |  |  | 1,259 |  |  |  |  |
8.27% Debt Bonds Maturing on 2021 [member] |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Face amount |  |  | $ 2,500 |  |  |  |  |
Maturity date |  |  | 2021 | 2021 |  |  |  |
Fixed interest rate |  |  | 8.27% |  |  |  |  | 8.27%
5.46% Debt Bonds Maturing on 2023 [member] |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Face amount |  |  | $ 7,500 |  |  |  |  |
Maturity date |  |  | 2023 | 2023 |  |  |  |
Fixed interest rate |  |  | 5.46% |  |  |  |  | 5.46%
4.63% Senior Notes Maturing on February Fifteen Two Thousand Twenty [member] |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Face amount |  |  |  |  |  |  |  | $ 500
Maturity date |  |  | February 15, 2020 | February 15, 2020 |  |  |  |
Fixed interest rate |  |  | 4.63% |  |  |  |  | 4.63%
Two Point Three Eight Percentage Senior Notes Maturing On November Twenty Six Two Thousand Eighteen [member] |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Face amount |  |  |  |  |  |  |  | $ 445
Maturity date |  |  | November 26, 2018 | November 26, 2018 |  |  |  |
Fixed interest rate |  |  | 2.38% |  |  |  |  | 2.38%
Three Point Eight Eight Percentage Senior Notes Maturing On November Twenty Six Two Thousand Twenty Three [member] |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Face amount |  |  |  |  |  |  |  | $ 900
Maturity date |  |  | November 26, 2023 | November 26, 2023 |  |  |  |
Fixed interest rate |  |  | 3.88% |  |  |  |  | 3.88%
5.25% Senior Notes Maturing On November 26, 2045 [member] |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Face amount |  |  |  |  |  |  |  | $ 600
Maturity date |  |  | November 26, 2043 | November 26, 2043 |  |  |  |
Fixed interest rate |  |  | 5.25% |  |  |  |  | 5.25%
1.75% Senior Notes [member] |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Face amount | € |  | € 1,000 |  |  |  |  |  |
Maturity date |  | 7 years |  |  |  |  |  |
Fixed interest rate |  | 1.75% |  |  |  |  |  |
Basis points over the relevant benchmark mid-swap |  | 155 |  |  |  |  |  |
Total yield percentage |  | 1.824% |  |  |  |  |  |
2.38% debt bonds maturing on 2018 [member] |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Maturity date | 2018 |  |  |  |  |  |  |
Fixed interest rate | 2.38% |  |  |  |  |  |  |
Repayment of bonds | $ 555 |  |  |  |  |  |  |
Borrowings | $ 445 |  |  |  |  |  |  |
TIIE plus 0.5% debt bonds maturing on 2022 [Member] |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Face amount |  |  | $ 1,500 |  |  |  |  |
Maturity date |  |  | 2022 | 2022 |  |  |  |
Basis points over the relevant benchmark mid-swap |  |  | 0.25 | 0.25 |  |  |  |
7.87% debt bonds maturing on 2027 [member] |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Face amount |  |  | $ 8,500 |  |  |  |  |
Maturity date |  |  | 2027 | 2027 |  |  |  |
Fixed interest rate |  |  | 7.87% |  |  |  |  | 7.87%
[1] | Convenience translation to U.S. dollars ($) - See Note 2.2.3

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