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Financial Instruments - Schedule of Lines of Credit (Detail) $ in Millions | Dec. 31, 2021 USD ($)
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Disclosure of detailed information about financial instruments [abstract] |
Other lines of credit in foreign subsidiaries | $ 199
Other lines of credit from banks | 540
Revolving credit facility | 1,750
Total | 2,489
Other lines of credit in foreign subsidiaries, available | 87
Other lines of credit from banks, available | 339
Revolving credit facility, available | 1,750
Total, available | $ 2,176

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- Definition Available Amount Of Other Lines Of Credit From Banks + References No definition available. + Details
Name: | cx_AvailableAmountOfOtherLinesOfCreditFromBanks
Namespace Prefix: | cx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Available Amount Of Other Lines Of Credit In Foreign Subsidiaries + References No definition available. + Details
Name: | cx_AvailableAmountOfOtherLinesOfCreditInForeignSubsidiaries
Namespace Prefix: | cx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Available amount of revolving credit facility + References No definition available. + Details
Name: | cx_AvailableAmountOfRevolvingCreditFacility
Namespace Prefix: | cx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Line Of Credit Facility Maximum Borrowing Capacity 1 + References No definition available. + Details
Name: | cx_LineOfCreditFacilityMaximumBorrowingCapacity1
Namespace Prefix: | cx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Line Of Credit Facility Remaining Borrowing Capacity 1 + References No definition available. + Details
Name: | cx_LineOfCreditFacilityRemainingBorrowingCapacity1
Namespace Prefix: | cx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Other lines of credit from banks. + References No definition available. + Details
Name: | cx_OtherLinesOfCreditFromBanks
Namespace Prefix: | cx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Other lines of credit in foreign subsidiaries. + References No definition available. + Details
Name: | cx_OtherLinesOfCreditInForeignSubsidiaries
Namespace Prefix: | cx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Revolving credit facility. + References No definition available. + Details
Name: | cx_RevolvingCreditFacility
Namespace Prefix: | cx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | ifrs-full_DisclosureOfFinancialInstrumentsAbstract
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration