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Financial Instruments - Schedule of Consolidated Long-Term Debt (Detail) $ in Millions, $ in Millions | Dec. 31, 2017 USD ($) | Dec. 31, 2017 MXN ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2016 MXN ($)
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Disclosure of detailed information about financial instruments [line items] |  |  |  |
Long term borrowings | $ 9,892 | $ 177,022 | $ 11,379 | $ 235,016
Later Than One Year and Not Later Than Two Years [Member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Long term borrowings |  | 30 |  |
Later Than Two Years and Not Later Than Three Years [Member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Long term borrowings |  | 10,175 |  |
Later Than Three Years and Not Later Than Four Years [Member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Long term borrowings |  | 26,948 |  |
Later Than Four Years and Not Later Than Five Years [Member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Long term borrowings |  | 19,594 |  |
More than 5 Years [Member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Long term borrowings | $ 6,164 | $ 120,275 |  |

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