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OTHER INFORMATION (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Interest Paid $ 48 $ 54  
Other current assets      
Amount due from joint interest partners, net of allowance for doubtful accounts included in other current assets 42   $ 42
Deferred tax assets, net 47   59
Derivatives from commodities contracts 79   87
Other long-term liabilities      
Asset retirement obligation, included in other long-term liabilities $ 344   $ 343