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Cash and Cash Equivalents - Addition Information (Detail) - MXN ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Cash and cash equivalents [abstract]
Deposits in margin accounts guarantees several obligations	$ 196	$ 250

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- Definition

Deposits in margin accounts guarantees several obligations.

+ References

No definition available.

+ Details

Name:	cx_DepositsInMarginAccountsGuaranteesSeveralObligations
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