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DIVESTITURES AND ACQUISITIONS - Other (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Apr. 30, 2018
Dec. 31, 2019
Dec. 31, 2018
Business Acquisition [Line Items]      
Purchase price $ 518    
Other upstream acquisitions      
Business Acquisition [Line Items]      
Purchase price   $ 6 $ 39
ARO liabilities assumed     $ 1