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Acquisitions and Divestitures - Pro Forma Information (Details) - Clayton Williams Energy - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Business Acquisition [Line Items]    
Revenues $ 1,286 $ 933
Net Income and Comprehensive Income Attributable to Noble Energy $ (554) $ (51)
Net Income Attributable to Noble Energy per Common Share    
Basic (in usd per share) $ 1.14 $ 0.10
Diluted (in usd per share) $ 1.14 $ 0.10