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STOCKHOLDERS' EQUITY: - Repurchase Program (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 6 Months Ended
Jun. 30, 2018
Dec. 31, 2008
SCC share repurchase program:    
Amount authorized for share repurchase program $ 3,000 $ 500
Closing price of NYSE (in dollars per share) $ 46.87  
Maximum Number of Shares that May Yet Be Purchased Under the Plan @ $46.87 1.7  
Percentage of ownership by parent 88.90%  
Parent Company (Grupo Mexico) common shares    
SCC share repurchase program:    
Number of Shares Purchased 119.5  
Cost of purchase of shares $ 2,900