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Revenue and Construction Contracts - Summary of Changes in the Balance of Contract Liabilities with Customers (Detail) - MXN ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Contract liabilities [abstract] |  |  |
Opening balance of contract liabilities with customers | $ 770 | $ 645 | $ 660
Increase during the period for new transactions | 1,070 | 1,156 | 1,040
Decrease during the period for exercise or expiration of incentives | (890) | (1,148) | (1,038)
Currency translation effects | (175) | 117 | (17)
Closing balance of contract liabilities with customers | $ 775 | $ 770 | $ 645

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- Definition Currency translation adjustments on contract liabilities. + 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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- Definition Increase decrease through new transactions contract liabilities. + References No definition available. + Details
Name: | cx_IncreaseDecreaseThroughNewTransactionsContractLiabilities
Namespace Prefix: | cx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The amount of an entity’s obligation to transfer goods or services to a customer for which the entity has received consideration (or the amount is due) from the customer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2018-01-01 -Paragraph 105 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=15&date=2018-03-01&anchor=para_105&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2018-01-01 -Paragraph 116 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=15&date=2018-03-01&anchor=para_116_a&doctype=Standard -URIDate 2018-03-16 + Details
Name: | ifrs-full_ContractLiabilities
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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- Definition The decrease in contract liabilities resulting from the performance obligation being satisfied. [Refer: Contract liabilities; Performance obligations [member]] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 15 -IssueDate 2018-01-01 -Paragraph 118 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=15&date=2018-03-01&anchor=para_118_e&doctype=Standard -URIDate 2018-03-16 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration