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

X

- 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

X

- References

No definition available.

+ Details

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