Other Accounts Receivable - Summary of Consolidated Other Accounts Receivable (Parenthetical) (Detail) - CEMEX Colombia S.A [member] - MXN ($) $ in Millions	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Other Accounts Receivables [line items]
Bank credit	$ 129	$ 141
Debt repayment description	Full repayment of the trust’s debt by means of a repayment of approximately 50% during 2019 and the remaining portion in November 2020.
Percentage Threshold Of Debt Repayment	50.00%

The amount of loans received from banks that have been secured by collateral. [Refer: Loans received]

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2018-01-01
-Paragraph 112
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_112_c&doctype=Standard
-URIDate 2018-03-16

Name:	ifrs-full_SecuredBankLoansReceived
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant