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Asset Acquisitions, Dispositions and Other (Details 2) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended
Mar. 31, 2016
Jan. 31, 2016
Mar. 31, 2016
Mar. 31, 2015
Sales and other operating revenues and income from discontinued operations        
Discontinued operations (net)     $ 438 $ (3)
Occidental Tower Building, Dallas Texas        
Acquisitions, dispositions and other transactions        
Proceeds from sale   $ 85    
Piceance operations        
Acquisitions, dispositions and other transactions        
Proceeds from sale $ 153      
Gain (loss) on sale $ 121