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Acquisitions and Divestitures - Pro Forma Information (Details) - Clayton Williams Energy - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Business Acquisition [Line Items]        
Revenues $ 1,273 $ 960 $ 3,789 $ 3,102
Net Income (Loss) and Comprehensive Income (Loss) Attributable to Noble Energy $ 227 $ (133) $ 758 $ (1,561)
Net Income (Loss) Attributable to Noble Energy per Common Share        
Basic (in usd per share) $ 0.47 $ (0.27) $ 1.57 $ (3.21)
Diluted (in usd per share) $ 0.47 $ (0.27) $ 1.56 $ (3.21)