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CONTINGENCIES (Oil and Gas Properties) (Details)
$ in Millions
Dec. 31, 2020
USD ($)
platform
well
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Loss Contingencies [Line Items]        
ARO, noncurrent $ 2,472 $ 2,505 $ 2,547 $ 2,583
Freeport-McMoRan Oil & Gas        
Loss Contingencies [Line Items]        
Number of productive oil wells | well 165      
Number of platforms and other structures | platform 120      
ARO, noncurrent $ 410