Document And Entity Information - USD ($) shares in Millions, $ in Billions	12 Months Ended
	Dec. 31, 2017	Feb. 07, 2018	Jun. 30, 2017
Document And Entity Information [Abstract]
Document Type	10-K
Document Period End Date	Dec. 31, 2017
Amendment Flag	false
Trading Symbol	DVN
Entity Registrant Name	DEVON ENERGY CORP/DE
Entity Central Index Key	0001090012
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Well-known Seasoned Issuer	Yes
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2017
Entity Filer Category	Large Accelerated Filer
Document Fiscal Period Focus	FY
Entity Public Float			$ 16.7
Entity Common Stock, Shares Outstanding		526.1