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Financial Instruments - Additional Information - Credit Agreement, Facilities Agreement and Financing Agreement (Detail) € in Millions, £ in Millions, $ in Millions, $ in Millions |  | 1 Months Ended | 12 Months Ended |  |  |  |  |  |
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Sep. 17, 2012 USD ($) | Nov. 30, 2016 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2017 MXN ($) | Dec. 31, 2017 EUR (€) | Dec. 31, 2017 GBP (£) | Jul. 19, 2017 USD ($) | Dec. 31, 2016 MXN ($) | Dec. 31, 2016 EUR (€) | Nov. 30, 2016 MXN ($) | Jul. 30, 2015 USD ($) | Jul. 30, 2015 MXN ($) | Sep. 29, 2014 USD ($)
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bank indebtedness |  |  |  |  | $ 3,062 | $ 56,879 |  |  |  | $ 52,763 |  |  |  |  |
Maturity period |  |  | 4 years 3 months 19 days |  |  |  |  |  |  |  |  |  |  |  |
Maximum capital expenditure |  |  | $ 1,000 | $ 1,000 |  |  |  |  |  |  |  |  |  |  |
Acquisitions and investments in joint ventures |  |  | $ 400 | $ 400 |  |  |  |  |  |  |  |  |  |  |
Leverage ratio |  |  | 3.85 | 4.22 | 5.21 |  |  |  |  |  |  |  |  |  |
CEMEX Holdings Philippines, Inc. [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum capital expenditure |  |  | $ 500 | $ 500 |  |  |  |  |  |  |  |  |  |  |
CEMEX Latam Holdings, S.A [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum capital expenditure |  |  | $ 500 | $ 500 |  |  |  |  |  |  |  |  |  |  |
Euro [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  | 3.50% | 4.30% |  | 3.50% | 3.50% | 3.50% |  | 4.30% | 4.30% |  |  |  |
US Dollar [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  | 5.90% | 6.30% |  | 5.90% | 5.90% | 5.90% |  | 6.30% | 6.30% |  |  |  |
Pesos [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  | 0.00% | 4.40% |  | 0.00% | 0.00% | 0.00% |  | 4.40% | 4.40% |  |  |  |
Pounds [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  | 2.60% | 0.00% |  | 2.60% | 2.60% | 2.60% |  | 0.00% | 0.00% |  |  |  |
Credit agreement [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit agreement amount |  |  | $ 2,746 | $ 785 |  | $ 53,959 |  |  |  | $ 16,259 |  |  |  |  |
Prepayments |  | $ 373 |  |  |  |  |  |  |  |  |  | $ 7,729 |  |  |
Funded commitments |  | $ 664 |  |  |  |  |  |  |  |  |  |  |  |  |
Credit agreement [member] | Later Than One Year and Not Later Than Two Years [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization amounts |  |  |  | 783 |  |  |  |  |  |  |  |  |  |  |
Credit agreement [member] | Later Than Two Years and Not Later Than Three Years [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization amounts |  |  |  | 883 |  |  |  |  |  |  |  |  |  |  |
Credit agreement [member] | Later Than Three Years and Not Later Than Four Years [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization amounts |  |  |  | 1,096 |  |  |  |  |  |  |  |  |  |  |
Credit agreement [member] | Revolving Credit Facility [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit agreement amount |  |  | 1,135 | 1,413 |  | 22,303 |  |  |  | 29,277 |  |  |  |  |
Credit agreement [member] | Euro [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit agreement amount | € |  |  |  |  |  |  | € 741 |  |  |  | € 746 |  |  |  |
Credit agreement [member] | US Dollar [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit agreement amount |  |  | 889 | $ 2,826 |  |  |  |  |  |  |  |  |  |  |
Credit agreement [member] | Pesos [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit agreement amount |  |  |  |  |  | 17,469 |  |  |  | $ 58,555 |  |  |  |  |
2017 Credit Agreement [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bank indebtedness |  |  | 4,050 |  |  |  |  |  | $ 4,050 |  |  |  |  |  |
2017 Credit Agreement [member] | US Dollar [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit agreement amount |  |  | 465 |  |  |  |  |  |  |  |  |  |  |  |
2017 Credit Agreement [member] | Pesos [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit agreement amount |  |  |  |  |  | $ 9,137 |  |  |  |  |  |  |  |  |
2017 Credit Agreement [member] | Pounds [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit agreement amount | £ |  |  |  |  |  |  |  | £ 344 |  |  |  |  |  |  |
2014 Credit Agreement [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bank indebtedness |  |  | $ 3,680 |  |  |  |  |  |  |  |  |  |  |  | $ 3,680
Less than or equal to 4.0 ratio [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Leverage ratio |  |  | 4.0 |  |  |  |  |  |  |  |  |  |  |  |
Less Than Or Equal To 3.75 Ratio [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Leverage ratio |  |  | 3.75 |  |  |  |  |  |  |  |  |  |  |  |
Bottom of range [member] | Credit agreement [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  | 1.25% |  |  | 1.25% | 1.25% | 1.25% |  |  |  |  |  |  |
Debt instrument basis point |  |  |  | 1.25% |  |  |  |  |  | 1.25% | 1.25% |  |  |  |
Bottom of range [member] | 2017 Credit Agreement [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate basis |  |  | 0.0125 |  |  |  |  |  |  |  |  |  |  |  |
Top of range [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Leverage ratio |  |  | 3.75 |  |  |  |  |  |  |  |  |  |  |  |
Top of range [member] | Credit agreement [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  | 6.50% |  |  | 6.50% | 6.50% | 6.50% |  |  |  |  |  |  |
Debt instrument basis point |  |  |  | 3.50% |  |  |  |  |  | 3.50% | 3.50% |  |  |  |
Top of range [member] | 2017 Credit Agreement [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate basis |  |  | 0.0350 |  |  |  |  |  |  |  |  |  |  |  |
Facilities Agreement [member] | Credit agreement [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit agreement amount |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,937 | $ 33,375 |
Amount of debt repaid | $ 1,350 |  |  |  |  |  |  |  |  |  |  |  |  |  |

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