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Long-Term Incentive Compensation - Narrative (Details) - USD ($)	1 Months Ended	3 Months Ended		9 Months Ended
	May 31, 2018	Sep. 30, 2018	Mar. 31, 2017	Sep. 30, 2018	Sep. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Pre-tax compensation expense, net of forfeitures		$ 5,000,000		$ 10,000,000	$ 10,000,000
Forfeitures			$ 7,000,000
Unrecognized compensation expense		28,000,000		28,000,000
Unrecognized compensation cost to be recognized during remainder of fiscal year		4,000,000		4,000,000
Unrecognized compensation cost to be recognized over the remaining requisite service periods subsequent to 2018		22,000,000		22,000,000
Unrecognized compensation cost to be recognized upon a specified capital transaction		$ 2,000,000		$ 2,000,000
Performance Share Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	599,040
Grant date fair value of awards	$ 4,000,000
Expected volatility rate	90.00%
Risk free rate	3.00%
Number of shares outstanding (in shares)		1,501,920		1,501,920
Performance period	4 years
Weighted average vesting period	5 years
Performance Unit Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Payment made in connection with awards that vested				$ 0
Amount accrued related to unvested outstanding awards (less than)		$ 1,000,000		$ 1,000,000

As of the balance sheet date, the additional unrecognized cost of equity-based awards made to employees under equity-based compensation awards that have yet to vest to be recognized in the remainder of the fiscal year following the latest fiscal year ended.

EP Energy LLC 10-Q