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STOCKHOLDERS' EQUITY: - Directors' Stock Award Plan (Details) - shares | 6 Months Ended |
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018
Parent Company (Grupo Mexico) common shares |  |
Activity in directors' stock award plan |  |
Treasury stock balance at the end of the period (in shares) | 96,570,902 | 101,574,318
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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- Definition Represents the additional number of shares issued to the director at each annual general meeting. + References No definition available. + Details
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- Definition Represents the extension term of plan for issuance of shares to employees and other management personnel. + References No definition available. + Details
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- Definition Represents the increased number of shares issued to the director at each annual general meeting. + References No definition available. + Details
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- Definition Represents the number of shares issued to the director at the time of election. + References No definition available. + Details
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- Definition Number of shares authorized for issuance under share-based payment arrangement. + References 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) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29,30) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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