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Supplemental Information To Statements Of Cash Flows (Narrative) (Details) - USD ($) $ in Millions | Sep. 30, 2020 | Dec. 31, 2019
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Supplemental Cash Flow Elements [Abstract] |  |
Accrued capital expenditures | $ 130 | $ 250

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- Definition Accrued capital expenditures. + References No definition available. + Details
Name: | dvn_AccruedCapitalExpenditures
Namespace Prefix: | dvn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_SupplementalCashFlowElementsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration