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STOCKHOLDERS' EQUITY: - Directors Stock Award Plan (Details) - shares
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Parent Company (Grupo Mexico)      
Activity in directors' stock award plan      
Treasury stock balance at the end of the period (in shares) 72,325,043   79,728,356
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 600,000 600,000  
Period of extension of plan 5 years    
Increased share awards issued to directors 1,600    
Numbers of shares shall be granted quarterly and conditioned upon the attendance of each director to each Board meeting 1,600    
Activity in directors' stock award plan      
Total shares granted at the beginning of the period (in shares) (416,800) (405,200)  
Granted (in shares) (3,200) (3,200)  
Total shares granted at the end of the period (in shares) (420,000) (408,400)  
Remaining shares reserved 180,000 191,600