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Organization and Nature of Operations	9 Months Ended
Organization and Nature of Operations	Sep. 30, 2012
Organization and Nature of Operations [Abstract]
Organization and Nature of Operations	Organization and Nature of Operations Noble Energy, Inc. (Noble Energy, we or us) is a leading independent energy company engaged in worldwide crude oil and natural gas exploration and production. Our core operating areas are onshore US, primarily in the DJ Basin and Marcellus Shale, in the deepwater Gulf of Mexico, offshore Eastern Mediterranean, and offshore West Africa.