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Asset Acquisitions, Dispositions and Other (Details) (USD $)
1 Months Ended 9 Months Ended 1 Months Ended 1 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2014
Aug. 31, 2014
Credit Facility
Sep. 30, 2014
Credit Facility
Jul. 31, 2014
Credit Facility
Apr. 30, 2014
Hugoton Field operations
Feb. 28, 2014
Hugoton Field operations
Sep. 30, 2014
Hugoton Field operations
Acquisitions, dispositions and other transactions                
Amount borrowed in commercial paper for short-term cash needs $ 1,600,000,000 $ 1,599,000,000            
Term of bank credit facility     5 years          
Amount of bank credit facility     2,000,000,000   2,000,000,000      
Amount outstanding under the credit facility       0        
Agreed value of proceeds from sale of assets             1,400,000,000  
Pre-tax proceeds from sale of assets           1,300,000,000    
Pre-tax gain on sale of property   532,000,000           532,000,000
Gain on sale of property, after tax               $ 339,000,000