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Goodwill And Other Intangible Assets (Schedule Of Goodwill By Reporting Segment) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Goodwill [Line Items] |  |  |
Goodwill | $ 6,303 us-gaap_Goodwill | $ 5,858 us-gaap_Goodwill | $ 6,079 us-gaap_Goodwill
Acquired during period | 3,283 us-gaap_GoodwillAcquiredDuringPeriod |  |
Impairment loss | (1,941)us-gaap_GoodwillImpairmentLoss | 0 us-gaap_GoodwillImpairmentLoss | 0 us-gaap_GoodwillImpairmentLoss
Written off related to sale of assets | (706)us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit | (26)us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit |
Translation adjustments | (191)us-gaap_GoodwillTranslationAdjustments | (195)us-gaap_GoodwillTranslationAdjustments |
United States [Member] |  |  |
Goodwill [Line Items] |  |  |
Goodwill | 2,618 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = country_US | 2,618 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = country_US | 2,644 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = country_US
Written off related to sale of assets |  | (26)us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit / us-gaap_StatementBusinessSegmentsAxis = country_US |
Canada [Member] |  |  |
Goodwill [Line Items] |  |  |
Goodwill |  | 2,838 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = country_CA | 3,033 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = country_CA
Impairment loss | (1,941)us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = country_CA |  |
Written off related to sale of assets | (706)us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit / us-gaap_StatementBusinessSegmentsAxis = country_CA |  |
Translation adjustments | (191)us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = country_CA | (195)us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = country_CA |
EnLink [Member] |  |  |
Goodwill [Line Items] |  |  |
Goodwill | 3,685 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = dvn_EnlinkMember | 402 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = dvn_EnlinkMember | 402 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = dvn_EnlinkMember
Acquired during period | $ 3,283 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = dvn_EnlinkMember |  |

X
- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
Name: | us-gaap_Goodwill
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | debit
Period Type: | duration

X
- Definition Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + 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 350 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13777-109266 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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- Details
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Balance Type: | na
Period Type: | duration

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- Definition Amount of increase (decrease) from foreign currency translation adjustments of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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X
- Definition Amount of divestiture of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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Balance Type: | credit
Period Type: | duration

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- Details
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Namespace Prefix: |
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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