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Acquisitions and Divestitures - Fair Value of Acquired Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Sep. 30, 2018
Dec. 31, 2017
Apr. 24, 2017
Business Acquisition [Line Items]        
Goodwill $ 110 $ 1,400 $ 1,310  
Clayton Williams Energy        
Business Acquisition [Line Items]        
Cash and Cash 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       1,291
Total Asset Value       $ 3,798