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Derivative Financial Instruments (Narrative) (Details)	Jun. 30, 2020 USD ($)
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Derivative collateral held	$ 0

X

- Definition

Amount of cash or cash-equivalent collateral held as credit support for obligations of counterparties to financial derivative contracts and that has not been offset against financial derivative assets.

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

Name:	us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration