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Acquisitions And Divestitures (Schedule Of Revenue And Earnings For General Partner and GeoSouthern) (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total operating revenues | $ 5,995 us-gaap_Revenues | $ 5,336 us-gaap_Revenues | $ 4,510 us-gaap_Revenues | $ 3,725 us-gaap_Revenues | $ 2,624 us-gaap_Revenues | $ 2,714 us-gaap_Revenues | $ 3,088 us-gaap_Revenues | $ 1,971 us-gaap_Revenues | $ 19,566 us-gaap_Revenues | $ 10,397 us-gaap_Revenues | $ 9,501 us-gaap_Revenues
Total operating expenses |  |  |  |  |  |  |  |  | 14,868 us-gaap_CostsAndExpenses | 9,830 us-gaap_CostsAndExpenses | 9,427 us-gaap_CostsAndExpenses
Operating income |  |  |  |  |  |  |  |  | 4,698 us-gaap_OperatingIncomeLoss | 567 us-gaap_OperatingIncomeLoss | 74 us-gaap_OperatingIncomeLoss
GeoSouthern Intermediate Holdings, LLC [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total operating revenues |  |  |  |  |  |  |  |  | 1,873 us-gaap_Revenues / us-gaap_BusinessAcquisitionAxis = dvn_GeosouthernIntermediateHoldingsLlcMember |  |
Total operating expenses |  |  |  |  |  |  |  |  | 960 us-gaap_CostsAndExpenses / us-gaap_BusinessAcquisitionAxis = dvn_GeosouthernIntermediateHoldingsLlcMember |  |
Operating income |  |  |  |  |  |  |  |  | 913 us-gaap_OperatingIncomeLoss / us-gaap_BusinessAcquisitionAxis = dvn_GeosouthernIntermediateHoldingsLlcMember |  |
General Partner [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total operating revenues |  |  |  |  |  |  |  |  | 2,509 us-gaap_Revenues / us-gaap_BusinessAcquisitionAxis = us-gaap_GeneralPartnerMember |  |
Total operating expenses |  |  |  |  |  |  |  |  | 2,464 us-gaap_CostsAndExpenses / us-gaap_BusinessAcquisitionAxis = us-gaap_GeneralPartnerMember |  |
Operating income |  |  |  |  |  |  |  |  | $ 45 us-gaap_OperatingIncomeLoss / us-gaap_BusinessAcquisitionAxis = us-gaap_GeneralPartnerMember |  |

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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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