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Trade Accounts Receivable, Net - Summary of Trade Accounts Receivable (Detail) - MXN ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Trade and other receivables [abstract]
Trade accounts receivable	$ 31,584	$ 32,733
Allowances for expected credit losses	(2,336)	(2,145)	$ (2,196)	$ (2,152)
Trade receivables	$ 29,248	$ 30,588

X

- Definition

The amount of current trade receivables and current other receivables, gross. [Refer: Current trade receivables; Other current receivables]

+ References

No definition available.

+ Details

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Namespace Prefix:	cx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The amount of an allowance account used to record impairments to financial assets due to credit losses. [Refer: Financial assets]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Expiry date 2021-01-01
-Name IFRS
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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The amount of current trade receivables. [Refer: Trade receivables]

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
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-IssueDate 2018-01-01
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+ Details

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

X

- References

No definition available.

+ Details

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Period Type:	duration