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Other Current and Non-current Liabilities - Summary of Other Current Liabilities (Parenthetical) (Detail) - 12 months ended Dec. 31, 2017 $ in Millions, $ in Millions | USD ($) | MXN ($)
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Subclassifications of assets, liabilities and equities [abstract] |  |
Income tax penalty imposed | $ 25 | $ 491

X
- Definition Fines and penalty expense. + References No definition available. + Details
Name: | cx_FinesAndPenaltyExpense
Namespace Prefix: | cx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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