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Contingencies - Additional Information (Detail) € in Millions, $ in Millions, $ in Millions |  | 1 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 11, 2017 USD ($) | Dec. 11, 2017 MXN ($) | Jun. 30, 2012 USD ($) | Jun. 30, 2012 MXN ($) | Dec. 31, 2017 USD ($) T | Dec. 31, 2017 MXN ($) T | Dec. 31, 2012 USD ($) Employees | Dec. 31, 2012 MXN ($) Employees | Dec. 31, 2011 Employees | Dec. 31, 2017 MXN ($) | Dec. 31, 2016 | Sep. 30, 2016 USD ($) | Sep. 30, 2016 MXN ($) | Sep. 30, 2016 EUR (€) | Dec. 31, 2015 | Jun. 30, 2010 USD ($) | Jun. 30, 2010 MXN ($)
Disclosure of Commitments and Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accrued environmental remediation liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 100 | $ 1,976
Fine payable by S.L.U. |  |  |  |  |  |  |  |  |  |  |  | $ 7 | $ 138 | € 6 |  |  |
Development levy on clay |  |  |  |  | $ 18 |  |  |  |  | $ 357 |  |  |  |  |  |  |
Number of former employees | Employees |  |  |  |  |  |  | 25 | 25 | 25 |  |  |  |  |  |  |  |
Amount of damages and interest identified |  |  |  |  |  |  | $ 66 | $ 1,297 |  |  |  |  |  |  |  |  |
Damages sought value |  |  | $ 80 | $ 1,564 |  |  |  |  |  |  |  |  |  |  |  |  |
Euro [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Commitments and Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Official closing exchange rates |  |  |  |  | 23.5866 |  |  |  |  | 23.5866 | 21.7945 |  |  |  | 18.7181 |  |
Pounds [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Commitments and Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Official closing exchange rates |  |  |  |  | 26.5361 |  |  |  |  | 26.5361 | 25.5361 |  |  |  | 25.4130 |  |
Colombian Peso [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Commitments and Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Official closing exchange rates |  |  |  |  | 0.0066 |  |  |  |  | 0.0066 | 0.0069 |  |  |  | 0.0055 |  |
United Kingdom [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Commitments and Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accrued environmental remediation liabilities |  |  |  |  | $ 178 |  |  |  |  | $ 3,493 |  |  |  |  |  |  |
Environmental remediation, description |  |  |  |  | Expenditure was assessed and quantified over the period in which the sites have the potential to cause environmental harm, which was accepted by the regulator as being up to 60 years from the date of closure | Expenditure was assessed and quantified over the period in which the sites have the potential to cause environmental harm, which was accepted by the regulator as being up to 60 years from the date of closure |  |  |  |  |  |  |  |  |  |  |
United States [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Commitments and Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accrued environmental remediation liabilities |  |  |  |  | $ 30 |  |  |  |  | $ 586 |  |  |  |  |  |  |
Superintendencia de Industria y Comercio [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Commitments and Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fine imposed | $ 25 | $ 491 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
CEMEX Polska [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Commitments and Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fine imposed |  |  |  |  | $ 27 | $ 531 |  |  |  |  |  |  |  |  |  |  |
Parent [member] | Polish Zloty [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Commitments and Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Official closing exchange rates |  |  |  |  | 3,470,000 |  |  |  |  | 3,470,000 |  |  |  |  |  |  |
Parent [member] | Euro [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Commitments and Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Official closing exchange rates |  |  |  |  | 830,000 |  |  |  |  | 830,000 |  |  |  |  |  |  |
Parent [member] | Pounds [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Commitments and Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Official closing exchange rates |  |  |  |  | 740,000 |  |  |  |  | 740,000 |  |  |  |  |  |  |
Parent [member] | Colombian Peso [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Commitments and Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Official closing exchange rates |  |  |  |  | 2,984,000,000 |  |  |  |  | 2,984,000,000 |  |  |  |  |  |  |
Parent [member] | Israelite Shekel [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Commitments and Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Official closing exchange rates |  |  |  |  | 3,470,000 |  |  |  |  | 3,470,000 |  |  |  |  |  |  |
Top of range [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Commitments and Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Incrementing production up on environmental permit needs modifications | T |  |  |  |  | 950,000 | 950,000 |  |  |  |  |  |  |  |  |  |  |

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