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STOCKHOLDERS' EQUITY: - Directors' Stock Award Plan (Details) - shares	9 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Parent Company (Grupo Mexico) common shares
Activity in directors' stock award plan
Treasury stock balance at the end of the period (in shares)	94,147,164	100,188,809
Directors' Stock Award Plan
Share based Compensation Plan
Common shares received on election as director	1,200
Additional shares issued at each annual general meeting	1,200
Total SCC shares reserved for the plan	600,000
Period of extension of plan	5 years
Increased share awards issued to directors	1,600

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Represents the extension term of plan for issuance of shares to employees and other management personnel.

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Number of shares authorized for issuance under share-based payment arrangement.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(3)
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Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends.

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-Name Accounting Standards Codification
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