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Financial Instruments - Summary of Consolidated Debt by Type of Instrument (Detail) $ in Millions, $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2017 MXN ($) | Dec. 31, 2016 MXN ($)
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Short- term |  |  | $ 16,973 | $ 1,222
Long- term | $ 9,892 | $ 11,379 | 177,022 | 235,016
Less than 1 year [Member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Short- term |  |  | 15,685 | 752
Long- term | $ 798 |  | (15,685) | (752)
Bank loans [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Short- term |  |  | 910 | 297
Long- term |  |  | 55,571 | 58,122
Bank loans [member] | Loans in Foreign Countries [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Short- term |  |  | 910 | 261
Long- term |  |  | 5,439 | 1,090
Bank loans [member] | Syndicated loans [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Short- term |  |  | 0 | 36
Long- term |  |  | 50,132 | 57,032
Notes payable [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Short- term |  |  | 378 | 173
Long- term |  |  | 137,136 | 177,646
Notes payable [member] | Notes payable in Mexico [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Short- term |  |  | 0 | 0
Long- term |  |  | 0 | 648
Debt instrument maturity period | 2018 |  |  |
Notes payable [member] | Medium term notes [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Short- term |  |  | 224 | 0
Long- term |  |  | 133,949 | 173,656
Notes payable [member] | Other Notes Payable [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Short- term |  |  | 154 | 173
Long- term |  |  | 3,187 | 3,342
Total bank loans and notes payables [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Short- term |  |  | 1,288 | 470
Long- term |  |  | $ 192,707 | $ 235,768
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 | 2018 | 2017 |  |
Bottom of range [member] | Bank loans [member] | Syndicated loans [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Debt instrument maturity period | 2018 | 2017 |  |
Bottom of range [member] | Notes payable [member] | Medium term notes [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Debt instrument maturity period | 2018 | 2017 |  |
Bottom of range [member] | Notes payable [member] | Other Notes Payable [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Debt instrument maturity period | 2018 | 2017 |  |
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 | 2022 | 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 | 2020 |  |
Top of range [member] | Notes payable [member] | Notes payable in Mexico [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Debt instrument maturity period |  | 2017 |  |
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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