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Supplemental Information To Statements Of Cash Flows (Narrative) (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Jan. 07, 2021 | Dec. 31, 2020
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Total Property And Equipment Net And Accounts Payable Member |  |  |
Supplemental Cash Flow [Line Items] |  |  |
Accrued capital expenditures | $ 200 |  | $ 100
Accounts Payable Member | WPX |  |  |
Supplemental Cash Flow [Line Items] |  |  |
Accrued capital expenditures |  | $ 150 |

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

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- Definition Supplemental Cash Flow [Line Items] + References No definition available. + Details
Name: | dvn_SupplementalCashFlowLineItems
Namespace Prefix: | dvn_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

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- Details
Name: | us-gaap_ExtinguishmentOfDebtAxis=us-gaap_AccountsPayableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_BusinessAcquisitionAxis=dvn_WPXMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |