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Financial Instruments - Detailed Information about In Lease Liabilities (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Text block [abstract] |  |  |
Lease financial liability at beginning of year | $ 1,306 | $ 1,315 | $ 1,309
Additions From New Leases | 213 | 274 | 296
Increase Decrease Reductions Of Leases Financial Liabilities From Payments | (276) | (239) | (192)
Increase Decrease Cancellation And Remeasurements Of Lease Financial Liabilities | (9) | (54) | (67)
Increase Decrease Through Foreign Exchange Difference Lease Financial Liabilities | 26 | 10 | (31)
Lease financial liability at end of year | $ 1,260 | $ 1,306 | $ 1,315

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- Definition Additions from new leases. + References No definition available. + Details
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Namespace Prefix: | cx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Increase decrease cancellation and remeasurements of lease financial liabilities. + References No definition available. + Details
Name: | cx_IncreaseDecreaseCancellationAndRemeasurementsOfLeaseFinancialLiabilities
Namespace Prefix: | cx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Increase decrease reductions of leases financial liabilities from payments. + References No definition available. + Details
Name: | cx_IncreaseDecreaseReductionsOfLeasesFinancialLiabilitiesFromPayments
Namespace Prefix: | cx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Increase decrease through foreign exchange difference lease financial liabilities. + References No definition available. + Details
Name: | cx_IncreaseDecreaseThroughForeignExchangeDifferenceLeaseFinancialLiabilities
Namespace Prefix: | cx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Text block [abstract] + References No definition available. + Details
Name: | cx_TextBlockAbstract
Namespace Prefix: | cx_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of liabilities related to the entity's leases. Lease is a contract, or part of a contract, that conveys the right to use an underlying asset for a period of time in exchange for consideration. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2020-01-01 -Paragraph 47 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2020-en-r&anchor=para_47_b&doctype=Standard -URIDate 2020-01-01 + Details
Name: | ifrs-full_LeaseLiabilities
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant