Financial Instruments - Summary of Fair Value of Derivative Financial Instruments at Fair Value Hierarchy (Detail) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Disclosure Of Financial Assets and Financial Liabilities [line items]
Derivative financial instruments	$ 60	$ 64
Investments in strategic equity securities	4	3
Other investments at fair value through earnings	1	1
Total derivative financial assets	65	68
Liabilities measured at fair value Derivative instruments	100	15
Level 1 [Member]
Disclosure Of Financial Assets and Financial Liabilities [line items]
Investments in strategic equity securities	4	3
Total derivative financial assets	4	3
Level 2 [Member]
Disclosure Of Financial Assets and Financial Liabilities [line items]
Derivative financial instruments	60	64
Other investments at fair value through earnings	1	1
Total derivative financial assets	61	65
Liabilities measured at fair value Derivative instruments	$ 100	$ 15

Disclosure Of Financial Assets and Financial Liabilities [line items]

No definition available.

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

- Definition

The amount of financial assets classified as derivative instruments. [Refer: Financial assets; Derivatives [member]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2024-01-01
-Paragraph 55
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_55&doctype=Standard
-URIDate 2024-03-27

+ Details

Name:	ifrs-full_DerivativeFinancialAssets
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The amount of financial liabilities classified as derivative instruments. [Refer: Financial assets; Derivatives [member]]

+ References

+ Details

Name:	ifrs-full_DerivativeFinancialLiabilities
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The amount of non-current derivative financial assets. [Refer: Derivative financial assets]

+ References

+ Details

Name:	ifrs-full_NoncurrentDerivativeFinancialAssets
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The amount of non-current financial assets measured at fair value through profit or loss. [Refer: Financial assets at fair value through profit or loss]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2024-01-01
-Paragraph 8
-Subparagraph a
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_8_a&doctype=Standard
-URIDate 2024-03-27

+ Details

Name:	ifrs-full_NoncurrentFinancialAssetsAtFairValueThroughProfitOrLoss
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The amount of non-current financial assets at fair value through profit or loss measured as such in accordance with the exemption for reacquisition of own equity instruments. [Refer: Financial assets at fair value through profit or loss, measured as such in accordance with exemption for reacquisition of own equity instruments]

+ References

+ Details

Name:	ifrs-full_NoncurrentFinancialAssetsAtFairValueThroughProfitOrLossMeasuredAsSuchInAccordanceWithExemptionForReacquisitionOfOwnEquityInstruments
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	ifrs-full_LevelsOfFairValueHierarchyAxis=ifrs-full_Level1OfFairValueHierarchyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_LevelsOfFairValueHierarchyAxis=ifrs-full_Level2OfFairValueHierarchyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: