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Financial Instruments - Additional Information - Credit Agreement, Facilities Agreement and Financing Agreement (Detail) € in Millions, £ in Millions, $ in Millions | 12 Months Ended |  |  |
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Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2018 EUR (€) | Dec. 31, 2018 GBP (£) | Dec. 31, 2017 EUR (€) | Dec. 31, 2017 GBP (£) | Jul. 19, 2017 USD ($)
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |
Maximum capital expenditure | $ 1,000 | $ 1,000 | $ 1,000 |  |  |  |  |
Acquisitions and investments in joint ventures | $ 400 | $ 400 | $ 400 |  |  |  |  |
Leverage Ratio | 384.00% | 385.00% | 422.00% | 384.00% | 384.00% | 385.00% | 385.00% |
CEMEX Holdings Philippines, Inc. [member] |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |
Maximum capital expenditure | $ 500 | $ 500 | $ 500 |  |  |  |  |
CEMEX Latam Holdings, S.A [member] |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |
Maximum capital expenditure | $ 500 | $ 500 | $ 500 |  |  |  |  |
Euro [member] |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |
Interest rate | 3.30% | 3.50% |  | 3.30% | 3.30% | 3.50% | 3.50% |
Pounds [member] |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |
Interest rate | 2.90% | 2.60% |  | 2.90% | 2.90% | 2.60% | 2.60% |
Credit agreement [member] |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |
Credit agreement amount | $ 2,746 | $ 2,746 |  |  |  |  |  |
Credit agreement [member] | Revolving Credit Facility [member] |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |
Credit agreement amount | $ 1,135 | 1,135 |  |  |  |  |  |
Credit agreement [member] | Euro [member] |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |
Credit agreement amount | € |  |  |  | € 741 |  | € 741 |  |
Credit agreement [member] | Pounds [member] |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |
Credit agreement amount | £ |  |  |  |  | £ 344 |  | £ 344 |
2017 Credit Agreement [member] |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |
Bank indebtedness |  | 4,050 |  |  |  |  |  | $ 4,050
2014 Credit Agreement [member] |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |
Bank indebtedness |  | $ 3,680 |  |  |  |  |  |
Less than or equal to 4.0 ratio [Member] |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |
Leverage Ratio | 400.00% |  |  | 400.00% | 400.00% |  |  |
Less Than Or Equal To 3.75 Ratio [Member] |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |
Leverage Ratio | 375.00% |  |  | 375.00% | 375.00% |  |  |
Bottom of range [member] | Credit agreement [member] |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |
Interest rate | 0.75% |  |  | 0.75% | 0.75% |  |  |
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 | 375.00% |  |  | 375.00% | 375.00% |  |  |
Top of range [member] | Credit agreement [member] |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |
Interest rate | 8.50% |  |  | 8.50% | 8.50% |  |  |
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 |  |  |  |  |  |

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