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Revenue and Construction Contracts - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2020
Bottom of range [member]
Disclosure of revenue [line items]
Customers credit term	15 days
Top of range [member]
Disclosure of revenue [line items]
Customers credit term	90 days

X

- Definition

Customers credit term.

+ References

No definition available.

+ Details

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Namespace Prefix:	cx_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Disclosure of revenue.

+ References

No definition available.

+ Details

Name:	cx_DisclosureOfRevenueLineItems
Namespace Prefix:	cx_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	ifrs-full_RangeAxis=ifrs-full_BottomOfRangeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_RangeAxis=ifrs-full_TopOfRangeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: