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ACQUISITIONS AND DIVESTITURES - Elk Hills Transaction Paragraph (Details)
$ in Millions
9 Months Ended
Apr. 09, 2018
USD ($)
a
Sep. 30, 2018
USD ($)
Working, surface and mineral interests in the Elk Hills field    
ACQUISITIONS AND DIVESTITURES    
Area of land | a 47,000  
Purchase price $ 518  
Liabilities assumed 7  
Purchase price adjustment $ 2  
Other oil and gas property    
ACQUISITIONS AND DIVESTITURES    
Reduction of Chevron royalty interest in one of CRCs oil and gas properties 50.00%  
Extension period capital commitment 2 years  
Other oil and gas property | Capital commitment    
ACQUISITIONS AND DIVESTITURES    
Long-term Purchase Commitment, Amount   $ 18