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CONTINGENCIES (Oil and Gas Properties) (Details)
$ in Millions
Dec. 31, 2017
USD ($)
platform
well
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Loss Contingencies [Line Items]        
ARO, noncurrent $ 2,580 $ 2,635 $ 2,771 $ 2,744
Freeport-McMoRan Oil & Gas        
Loss Contingencies [Line Items]        
Number of productive oil wells | well 250      
Number of platforms and other structures | platform 140      
ARO, noncurrent $ 553