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Commitments - Summary of Contractual Obligations (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 Borrowings [Line Items] |  |  |  |
Long-term debt | $ 9,892 | $ 11,379 | $ 177,022 | $ 235,016
Finance lease obligations | 175 | 107 |  |
Convertible notes | 906 | 1,205 |  |
Total debt and other financial obligations | 10,973 | 12,691 |  |
Operating leases | 494 | 515 |  |
Interest payments on debt | 3,073 | 3,996 |  |
Pension plans and other benefits | 1,587 | 1,414 |  |
Purchases of raw materials, fuel and energy | 4,326 | 4,440 |  |
Total contractual obligations | 20,453 | $ 23,056 | 401,901 | 477,720
Less than 1 year [Member] |  |  |  |
Disclosure of Detailed Information About Borrowings [Line Items] |  |  |  |
Long-term debt | 798 |  | (15,685) | $ (752)
Finance lease obligations | 36 |  |  |
Convertible notes | 379 |  |  |
Total debt and other financial obligations | 1,213 |  |  |
Operating leases | 109 |  |  |
Interest payments on debt | 448 |  |  |
Pension plans and other benefits | 156 |  |  |
Purchases of raw materials, fuel and energy | 649 |  |  |
Total contractual obligations | 2,575 |  | 50,599 |
1-3 years [Member] |  |  |  |
Disclosure of Detailed Information About Borrowings [Line Items] |  |  |  |
Long-term debt | 519 |  |  |
Finance lease obligations | 87 |  |  |
Convertible notes | 527 |  |  |
Total debt and other financial obligations | 1,133 |  |  |
Operating leases | 181 |  |  |
Interest payments on debt | 968 |  |  |
Pension plans and other benefits | 307 |  |  |
Purchases of raw materials, fuel and energy | 810 |  |  |
Total contractual obligations | 3,399 |  | 66,790 |
3-5 Years [Member] |  |  |  |
Disclosure of Detailed Information About Borrowings [Line Items] |  |  |  |
Long-term debt | 2,411 |  |  |
Finance lease obligations | 52 |  |  |
Convertible notes | 0 |  |  |
Total debt and other financial obligations | 2,463 |  |  |
Operating leases | 136 |  |  |
Interest payments on debt | 809 |  |  |
Pension plans and other benefits | 316 |  |  |
Purchases of raw materials, fuel and energy | 866 |  |  |
Total contractual obligations | 4,590 |  | 90,193 |
More than 5 Years [Member] |  |  |  |
Disclosure of Detailed Information About Borrowings [Line Items] |  |  |  |
Long-term debt | 6,164 |  | 120,275 |
Finance lease obligations | 0 |  |  |
Convertible notes | 0 |  |  |
Total debt and other financial obligations | 6,164 |  |  |
Operating leases | 68 |  |  |
Interest payments on debt | 848 |  |  |
Pension plans and other benefits | 808 |  |  |
Purchases of raw materials, fuel and energy | 2,001 |  |  |
Total contractual obligations | $ 9,889 |  | $ 194,319 |

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