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ACQUISITIONS (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2013
Dec. 31, 2014
Oil and gas properties in the Ventura Basin      
Acquisitions      
Cash paid on acquisition     $ 200
Oil and gas properties in San Joaquin Basin      
Acquisitions      
Cash paid on acquisition $ 140 $ 50  
Minimum obligation to spend for exploration and development activities   $ 250  
Term of exploration and development activities   5 years  
Percentage of minimum obligation spent to date 30.00%    
Producing and non-producing oil and gas properties, all basins      
Acquisitions      
Cash paid on acquisition     $ 290