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Financial Instruments - Summary of Long Term Notes Payable (Parenthetical) (Detail) $ in Millions | Dec. 31, 2021 USD ($)
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Disclosure of detailed information about financial instruments [line items] |
Debt Instrument Repurchased Notes Outstanding | $ 0

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- Definition Debt instrument repurchased notes outstanding. + References No definition available. + Details
Name: | cx_DebtInstrumentRepurchasedNotesOutstanding
Namespace Prefix: | cx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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