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Clayton Williams Energy Acquisition - Fair Value of Acquired Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Apr. 24, 2017
Dec. 31, 2016
Dec. 30, 2015
Business Acquisition [Line Items]        
Goodwill $ 1,310   $ 0 $ 779
Clayton Williams Energy        
Business Acquisition [Line Items]        
Cash and Equivalents   $ 21    
Other Current Assets   70    
Proved Reserves   722    
Undeveloped Leasehold Cost   1,571    
Gathering and Processing Assets   48    
Asset Retirement Costs   63    
Other Property Plant and Equipment   12    
Goodwill $ 1,300 1,310    
Total Asset Value   $ 3,817