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Restructuring Costs (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 46us-gaap_RestructuringCharges	$ 54us-gaap_RestructuringCharges	$ 74us-gaap_RestructuringCharges
Office Consolidation [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring costs incurred to date		134us-gaap_RestructuringAndRelatedCostCostIncurredToDate1 / us-gaap_RestructuringPlanAxis = dvn_OfficeConsolidationMember
Offshore Divestiture [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring costs incurred to date			196us-gaap_RestructuringAndRelatedCostCostIncurredToDate1 / us-gaap_RestructuringPlanAxis = dvn_OffshoreDivestitureMember
Employee Related And Other Costs [Member] | Canadian Divestitures [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	46us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = dvn_EmployeeRelatedAndOtherCostsMember / us-gaap_RestructuringPlanAxis = dvn_CanadaDivestitureMember
Accelerated Vesting Of Share-Based Grants For Employees [Member] | Canadian Divestitures [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 15us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = dvn_AcceleratedVestingOfStockAwardsForEmployeesMember / us-gaap_RestructuringPlanAxis = dvn_CanadaDivestitureMember

X

- Definition

Amount of costs incurred to date for the specified restructuring cost.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 420

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 420

-SubTopic 10

-Section S99

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-Subparagraph (SAB TOPIC 5.P.4(b))

-URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 5

-Section P

-Subsection 3, 4

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- Definition

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 420

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-Name Accounting Standards Codification

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-Subparagraph (SAB TOPIC 5.P.4(b))

-URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747



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-Publisher FASB

-Name Accounting Standards Codification

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-URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140864-122747



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