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Income Taxes (Narrative) (Details) $ in Millions	Sep. 30, 2021 USD ($)
WPX Merger [Member]
Income Tax [Line Items]
Deferred income taxes	$ 250

X

- Definition

Business combination recognized identifiable assets acquired and liabilities assumed deferred income taxes.

+ References

No definition available.

+ Details

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Namespace Prefix:	dvn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Income Tax [Line Items]

+ References

No definition available.

+ Details

Name:	dvn_IncomeTaxLineItems
Namespace Prefix:	dvn_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_BusinessAcquisitionAxis=dvn_WPXMergerMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: