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COMMITMENTS AND CONTINGENCIES: - Guaymas sulfuric acid spill (Details)			12 Months Ended
	Jul. 19, 2019 item	Jul. 09, 2019 m³	Dec. 31, 2019 company
SUBSEQUENT EVENTS:
Period of sustainability reports issued			10 years
Number of leading companies in sustainability | company			42
Marine Terminal in Guaymas
SUBSEQUENT EVENTS:
Volume of sulfuric acid discharged in the incident at Guaymas		3
Water volume at Guaymas bay		340,000,000
Number of times of renewal | item	4
Number of years of each renewal	2 years

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Water volume at Guaymas bay.

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