Document And Entity Information - shares shares in Millions	6 Months Ended
	Jun. 30, 2018	Jul. 18, 2018
Document And Entity Information [Abstract]
Document Type	10-Q
Document Period End Date	Jun. 30, 2018
Amendment Flag	false
Trading Symbol	DVN
Entity Registrant Name	DEVON ENERGY CORP/DE
Entity Central Index Key	0001090012
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2018
Entity Filer Category	Large Accelerated Filer
Document Fiscal Period Focus	Q2
Entity Common Stock, Shares Outstanding		508.8