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STOCKHOLDERS' EQUITY: - Directors' Stock Award Plan (Details) - shares
 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Share based Compensation Plan    
Total SCC shares reserved for the plan 600,000 600,000
Activity in directors' stock award plan    
Total shares granted at the beginning of the period (in shares) (345,600) (334,800)
Granted in the period (16,000) (10,800)
Total shares granted at the end of the period (in shares) (361,600) (345,600)
Remaining shares reserved 238,400 254,400
Parent Company (Grupo Mexico) common shares    
Activity in directors' stock award plan    
Treasury stock balance at the end of the period (in shares) 101,574,318 111,939,269
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