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v3.21.1

Significant Accounting Policies - Summary of Maximum Average Useful Lives of Fixed Assets (Detail) | 12 Months Ended
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Dec. 31, 2020
Administrative Buildings [member] |
Disclosure of detailed information about property, plant and equipment [line items] |
Years | 31 years
Industrial Buildings [member] |
Disclosure of detailed information about property, plant and equipment [line items] |
Years | 26 years
Machinery and Equipment in Plant [member] |
Disclosure of detailed information about property, plant and equipment [line items] |
Years | 15 years
Ready-mix Trucks and Motor Vehicles [member] |
Disclosure of detailed information about property, plant and equipment [line items] |
Years | 9 years
Office Equipment and Other Assets [member] |
Disclosure of detailed information about property, plant and equipment [line items] |
Years | 6 years

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- Definition Property Plant And Equipment Useful Life1 + References No definition available. + Details
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Namespace Prefix: | cx_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=srt_IndustrialPropertyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=cx_ReadymixTrucksAndMotorVehiclesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=cx_OfficeEquipmentAndOtherAssetsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |