Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2015	Oct. 20, 2015
Entity Registrant Name	EP Energy Corp
Entity Central Index Key	0001584952
Document Type	10-Q
Document Period End Date	Sep. 30, 2015
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q3
Class A
Entity Common Stock, Shares Outstanding		247,998,083
Class B
Entity Common Stock, Shares Outstanding		801,833