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Goodwill and Intangible Assets, Net - Summary of Changes in intangible Asset (Parenthetical) (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of detailed information about intangible assets [line items] |  |  |
Carrying amount of internal-use software | $ 213 | $ 253 |
Computer software [member] |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Capitalized direct costs | $ 40 | $ 102 | $ 133

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- Definition Capitalised software development costs. + References No definition available. + Details
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Namespace Prefix: | cx_
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Balance Type: | debit
Period Type: | duration

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- Definition The amount of intangible assets representing computer software. [Refer: Intangible assets other than goodwill] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 38 -IssueDate 2020-01-01 -Paragraph 119 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=38&code=ifrs-tx-2020-en-r&anchor=para_119_c&doctype=Standard -URIDate 2020-01-01 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |