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Financial Instruments - Summary of Consolidated Debt by Type of Instrument (Detail) $ in Millions, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 MXN ($) | Dec. 31, 2017 MXN ($) | Dec. 31, 2018 USD ($)
Disclosure of detailed information about financial instruments [line items] |  |  |
Current maturities | $ 129 | $ 15,685 |
Short-term debt | 883 | 16,973 |
Long- term | 182,074 | 177,022 | $ 9,339
Bank loans [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Short- term | 614 | 910 |
Long- term | 68,896 | 55,571 |
Bank loans [member] | Loans in Foreign Countries [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Short- term | 614 | 910 |
Long- term | 6,436 | 5,439 |
Bank loans [member] | Syndicated loans [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Short- term | 0 | 0 |
Long- term | 62,460 | 50,132 |
Notes payable [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Short- term | 140 | 378 |
Long- term | 113,307 | 137,136 |
Notes payable [member] | Medium term notes [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Short- term | 0 | 224 |
Long- term | 110,157 | 133,949 |
Notes payable [member] | Other Notes Payable [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Short- term | 140 | 154 |
Long- term | 3,150 | 3,187 |
Total bank loans and notes payables [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Short- term | 754 | 1,288 |
Long- term | $ 182,203 | $ 192,707 |
Bottom of range [member] | Bank loans [member] | Loans in Foreign Countries [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Debt instrument maturity period | 2019 | 2018 |
Bottom of range [member] | Bank loans [member] | Syndicated loans [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Debt instrument maturity period | 2020 | 2018 |
Bottom of range [member] | Notes payable [member] | Medium term notes [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Debt instrument maturity period | 2023 | 2018 |
Bottom of range [member] | Notes payable [member] | Other Notes Payable [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Debt instrument maturity period | 2019 | 2018 |
Top of range [member] | Bank loans [member] | Loans in Foreign Countries [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Debt instrument maturity period | 2024 | 2022 |
Top of range [member] | Bank loans [member] | Syndicated loans [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Debt instrument maturity period | 2022 | 2022 |
Top of range [member] | Notes payable [member] | Medium term notes [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Debt instrument maturity period | 2026 | 2026 |
Top of range [member] | Notes payable [member] | Other Notes Payable [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Debt instrument maturity period | 2025 | 2025 |

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