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Dispositions Dispositions (Details) - USD ($)
$ in Millions
1 Months Ended 6 Months Ended
Jul. 31, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Proceeds from Sale of Oil and Gas Property and Equipment     $ 2 $ 2,232
Williston Basin [Member]        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Proceeds from Sale of Oil and Gas Property and Equipment   $ 90    
Significant Acquisitions and Disposals, Gain (Loss) on Sale or Disposal, Pretax   $ (91)   $ (91)
Subsequent Event [Member] | East Texas/North Louisiana and Wilburton Assets [Member]        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Proceeds from Sale of Oil and Gas Property and Equipment $ 102