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Revenue and Construction Contracts - Summary of Changes in the Balance of Contract Liabilities with Customers (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Contract liabilities [abstract] |  |  |
Opening balance of contract liabilities with customers | $ 225 | $ 234 | $ 237
Increase during the period for new transactions | 1,536 | 1,931 | 1,763
Decrease during the period for exercise or expiration of incentives | (1,561) | (1,946) | (1,762)
Currency translation effects | 1 | 6 | (4)
Closing balance of contract liabilities with customers | $ 201 | $ 225 | $ 234

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- Definition Currency translation adjustments on contract liabilities. + References No definition available. + Details
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- Definition Increase decrease through new transactions contract liabilities. + References No definition available. + Details
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Namespace Prefix: | cx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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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 2020-01-01 -Paragraph 105 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2020-en-r&anchor=para_105&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2020-01-01 -Paragraph 116 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2020-en-r&anchor=para_116_a&doctype=Standard -URIDate 2020-01-01 + Details
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- References No definition available. + Details
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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 2020-01-01 -Paragraph 118 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2020-en-r&anchor=para_118_e&doctype=Standard -URIDate 2020-01-01 + Details
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