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OTHER INFORMATION (Details) - USD ($)
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Other Information [Line Items]      
Cash restricted for capital investments and distributions to a joint venture (JV) partner $ 10,000,000   $ 3,000,000
Other Current Assets      
Net amounts due from joint interest partners 51,000,000   70,000,000
Derivative assets 15,000,000   39,000,000
Prepaid expenses 18,000,000   19,000,000
Other 0   2,000,000
Other current assets, net 84,000,000   130,000,000
Accounts Receivable, Allowance for Credit Loss 19,000,000   19,000,000
Accrued Liabilities      
Accrued employee-related costs 63,000,000   116,000,000
Accrued taxes other than on income 64,000,000   57,000,000
Accrued interest 65,000,000   13,000,000
Lease liability 19,000,000   28,000,000
Asset retirement obligation 28,000,000   28,000,000
Other 21,000,000   71,000,000
Accrued liabilities 260,000,000   313,000,000
Taxes paid 0 $ 0  
Interest paid, net of capitalized amounts 45,000,000 $ 69,000,000  
Total derivatives      
Accrued Liabilities      
Non-current asset retirement obligation $ 495,000,000   $ 489,000,000