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Commitments - Additional Information (Detail) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2017 USD ($) T | Apr. 30, 2016 MWh | Jul. 30, 2012 | Feb. 28, 2010 | Dec. 31, 2017 MXN ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2016 MXN ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2015 MXN ($)
Disclosure of Commitments and Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Guaranteed loans of certain subsidiaries | $ 1,506,000,000 |  |  |  | $ 29,601,000,000 | $ 2,887,000,000 | $ 59,819,000,000 |  |
Liabilities secured by property, machinery and equipment |  |  |  |  | 0 |  | 0 |  |
Self-insured health care benefits | 64,000,000 |  |  |  | 1,258,000,000 | $ 69,000,000 | $ 1,430,000,000 | $ 69,000,000 | $ 1,189,000,000
Bottom of range [member] |  |  |  |  |  |  |  |  |
Disclosure of Commitments and Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Stop-loss limits value under medical assistance | 23,000 |  |  |  |  |  |  |  |
Bottom of range [member] | Employees [Member] |  |  |  |  |  |  |  |  |
Disclosure of Commitments and Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Stop-loss limits value under medical assistance | $ 100,000 |  |  |  |  |  |  |  |
Top of range [member] |  |  |  |  |  |  |  |  |
Disclosure of Commitments and Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Combined volume allocate to TEG and other energy producer | T | 950,000 |  |  |  |  |  |  |  |
Stop-loss limits value under medical assistance | $ 400,000 |  |  |  |  |  |  |  |
Top of range [member] | Employees [Member] |  |  |  |  |  |  |  |  |
Disclosure of Commitments and Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Stop-loss limits value under medical assistance | 2,500,000 |  |  |  |  |  |  |  |
International Business Machines Corporation [Member] |  |  |  |  |  |  |  |  |
Disclosure of Commitments and Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Strategic agreement period |  |  | 10-year |  |  |  |  |  |
Ventikas [Member] |  |  |  |  |  |  |  |  |
Disclosure of Commitments and Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Acquired energy usage period |  | 20 years |  |  |  |  |  |  |
Estimated annual cost | 27,000,000 |  |  |  |  |  |  |  |
Combined generation capacity | MWh |  | 252 |  |  |  |  |  |  |
EURUS [Member] |  |  |  |  |  |  |  |  |
Disclosure of Commitments and Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Acquired energy usage period |  |  |  | 20 years |  |  |  |  |
Estimated annual cost | 71,000,000 |  |  |  |  |  |  |  |
Installed capacity |  |  |  | 250 MW |  |  |  |  |
Termoelectrica del Golfo [Member] |  |  |  |  |  |  |  |  |
Disclosure of Commitments and Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Estimated annual cost | $ 110,000,000 |  |  |  |  |  |  |  |
Combined volume allocate to TEG and other energy producer | T | 1,200,000 |  |  |  |  |  |  |  |
CEMEX Ostzement GmbH [Member] |  |  |  |  |  |  |  |  |
Disclosure of Commitments and Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Estimated annual cost |  |  |  |  | $ 12,000,000 |  |  |  |

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