|**Acquisitions and Divestitures**                          | 6 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             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|**Discontinued Operations and Disposal Groups [Abstract]** |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Acquisitions and Divestitures                              | 4. Acquisitions and Divestitures2017 Asset TransactionsDuring the first six months of 2017, we engaged in the following asset transactions.Marcellus Shale Upstream DivestitureOn June 28, 2017, we closed the sale of all of our Marcellus Shale upstream assets, which are primarily natural gas properties. The purchase price totaled$1.2 billion, and we received$1.0 billionof net cash proceeds, after consideration of customary adjustments, at closing. The purchase price includes additional contingent consideration of up to$100 millionstructured asthreeseparate payments of$33.3 millioneach.  The contingent payments are in effect should the average annual price of the Appalachia Dominion, South Point index exceed$3.30per MMBtu in the individual annual periods from 2018 through 2020. No amounts have been accrued related to the contingent consideration. Proceeds from the transaction were used to repay borrowings resulting from the Clayton Williams Energy Acquisition.  SeeNote6. Debt.In second quarter 2017, we recognized a total loss of$2.3 billion, or$1.5 billionafter-tax, on this transaction. The aggregate net book value of the properties prior to the sale was approximately$3.4 billion, which included approximately$883 millionof undeveloped leasehold cost.As part of the total loss, we recorded a charge of$41 million, discounted, relating to a retained transportation contract where the pipeline project is currently in service. We no longer have production to satisfy this commitment and do not plan to utilize this capacity in the future. As such, we recorded a charge in accordance with accounting for exit or disposal activities under ASC 420 - Exit or Disposal Cost Obligations. In addition, we have retained other Marcellus Shale firm transportation contracts, relating to pipeline projects which are not yet commercially available to us. These projects are either under construction or have not yet been approved by the Federal Energy Regulatory Commission (FERC). As these projects become commercially available to us, we will assess, based upon the facts and circumstances, the recognition of any potential exit cost liabilities. We expect to incur additional firm transportation, as well as other restructuring or personnel costs, associated with this exit activity in the future. SeeNote2. Basis of PresentationandNote12. Commitments and Contingencies.For the three and six months ended June 30, 2017, our consolidated statements of operations include a pre-tax loss of$2.3 billionfor the respective periods associated with the divested Marcellus Shale upstream assets, driven by the loss on sale. For the three and six months ended June 30, 2016, our consolidated statements of operations include a pre-tax loss of$91 millionand$167 million, respectively.During second quarter 2017, production from the Marcellus Shale upstream assets totaled393MMcfe/d. With the closing of the sale, we recorded a decrease in net proved reserves of approximately241MMBoe, of which approximately190MMBoe were proved developed reserves and51MMBoe were proved undeveloped reserves.Marcellus Shale CONE Gathering DivestitureOn May 18, 2017, we announced the signing of a definitive agreement to divest an affiliate that holds the50%interest in CONE Gathering, LLC (CONE Gathering) and21.7 millioncommon and subordinated limited partnership units in CONE Midstream Partners LP (NYSE:CNNX) (CONE Midstream), for total cash consideration of$765 million. CONE Gathering owns the general partner of CONE Midstream, and the limited partnership units represent a33.5%ownership interest in CONE Midstream. CONE Midstream constructs, owns and operates natural gas gathering and other midstream energy assets in support of Marcellus Shale activities.We expect closing to occur in second half 2017, subject to customary closing conditions and adjustments, and have classified these assets as held for sale at June 30, 2017. The other50%owner of CONE Gathering is pursuing litigation in response to our sale. At this time, we expect this matter to be resolved prior to closing. Going forward, our midstream efforts are focused on Noble Midstream Partners, supporting our DJ Basin and Delaware Basin growth areas.Assets Held for SaleAt June 30, 2017, assets held for sale included$173 millionrelated to our investment in CONE Gathering and$18 millionrelated to other onshore properties.Delaware Basin AcquisitionIn first quarter 2017, we closed a bolt-on acquisition in the Delaware Basin for$301 million, approximately$246 millionof which was allocated to undeveloped leasehold cost. The acquisition includedsevenproducing wells, of whichfourare operated by us.Noble Midstream PartnersAsset ContributionOn June 26, 2017, Noble Midstream Partners acquired an additional15%limited partner interest in Blanco River DevCo LP (Blanco River DevCo), increasing its ownership to40%of the Blanco River DevCo LP, and acquired the remaining20%limited partner interest in Colorado River DevCo LP (Colorado River DevCo) from Noble Energy for$270 million.Blanco River DevCo holds Noble Midstream Partners’ Delaware Basin in-field gathering dedications for crude oil and produced water gathering services on approximately111,000net acres, with substantially all of the acreage also dedicated for natural gas gathering. Colorado River DevCo consists of gathering systems across Noble Energy’s Wells Ranch and East Pony development areas in the DJ Basin.The$270 millionconsideration consisted of$245 millionin cash and562,430common units representing limited partner interests in Noble Midstream Partners. Noble Midstream Partners funded the cash consideration with approximately$138 millionof net proceeds from a concurrent private placement of common units and$90 millionof borrowings under the Noble Midstream Services Revolving Credit Facility (defined below) and the remainder from cash on hand.Advantage AcquisitionOn April 3, 2017, Noble Midstream Partners and Plains Pipeline, L.P., a wholly owned subsidiary of Plains All American Pipeline, L.P., acquired Advantage Pipeline, L.L.C. (Advantage Pipeline) for$133 millionthrough a newly formed50/50 joint venture (Advantage Joint Venture). Noble Midstream Partners contributed$66.5million of cash to the joint venture, funded by available cash on hand and the Noble Midstream Services Revolving Credit Facility. The Advantage Joint Venture is accounted for under the equity method and is included within our Midstream segment.Noble Midstream Partners serves as the operator of the Advantage Pipeline system, which includes a70-mile crude oil pipeline in the Delaware Basin from Reeves County, Texas to Crane County, Texas with150,000barrels per day of shipping capacity (expandable to over200,000barrels per day) and490,000barrels of storage capacity.2016 Asset TransactionsDuring the first six months of 2016, we engaged in the following asset transactions.US Onshore PropertiesWe entered into the following transactions for which we:•closed the divestiture of our Bowdoin property in northern Montana, generating proceeds of$43 million, and recognized a$23 millionloss on sale;•sold certain other US onshore properties, generating net proceeds of$20 million, which were primarily applied to the DJ Basin depletable field, with no recognition of gain or loss;•entered into a purchase and sale agreement for the divestiture of certain producing and undeveloped interests covering approximately33,100net acres in the DJ Basin for$505 million, subject to customary closing adjustments. We received proceeds of$486 millionduring second quarter 2016, which were primarily applied to the DJ Basin depletable field, with no recognition of gain or loss.  We expect to close the sale of the remaining properties, which are classified as held for sale, in the second half of 2017; and•entered into an acreage exchange agreement receiving approximately11,700net acres within our Wells Ranch development area in exchange for approximately13,500net acres primarily from our Bronco area, located southwest of Wells Ranch, with no recognition of gain or loss.Cyprus Project (Offshore Cyprus)In first quarter 2017, we received the remaining$40 millionconsideration for the farm-out of a35%interest in Block 12, which includes the Aphrodite natural gas discovery. Proceeds received, including$131 millionin first quarter 2016, were applied to the Cyprus project asset with no gain or loss recognized.Offshore Israel AssetsIn first quarter 2016, we closed the divestment of our47%interest in the Alon A and Alon C licenses, which include the Karish and Tanin fields, for a total sales price of$73 million($67 millionfor asset consideration and$6 millionfor cost adjustments). Proceeds were applied to reduce field basis with no recognition of gain or loss.
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                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           
|•                                                          | closed the divestiture of our Bowdoin property in northern Montana, generating proceeds of$43 million, and recognized a$23 millionloss on sale;                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         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                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           
|•                                                          | sold certain other US onshore properties, generating net proceeds of$20 million, which were primarily applied to the DJ Basin depletable field, with no recognition of gain or loss;                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    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|•                                                          | entered into a purchase and sale agreement for the divestiture of certain producing and undeveloped interests covering approximately33,100net acres in the DJ Basin for$505 million, subject to customary closing adjustments. We received proceeds of$486 millionduring second quarter 2016, which were primarily applied to the DJ Basin depletable field, with no recognition of gain or loss.  We expect to close the sale of the remaining properties, which are classified as held for sale, in the second half of 2017; and                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          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|•                                                          | entered into an acreage exchange agreement receiving approximately11,700net acres within our Wells Ranch development area in exchange for approximately13,500net acres primarily from our Bronco area, located southwest of Wells Ranch, with no recognition of gain or loss.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      

X- ReferencesNo definition available.
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duration X- DefinitionThe entire disclosure related to a disposal group. Includes, but is not limited to, a discontinued operation, disposal classified as held-for-sale or disposed of by means other than sale or disposal of an individually significant component.
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