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Cash and Cash Equivalents - Addition Information (Detail) - MXN ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Cash and cash equivalents [abstract] |  |
Deposits in margin accounts guarantees several obligations | $ 234 | $ 196

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- Definition Deposits in margin accounts guarantees several obligations. + References No definition available. + Details
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Namespace Prefix: | cx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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