Derivative Financial Instruments (Schedule Of Gas Processing and Fractionation Open Positions) (Details) - EnLink [Member]	12 Months Ended
	Dec. 31, 2017 MMBTU $ / MMBTU $ / gal MBbls
OPIS Mont Belvieu Texas Propane Basis Swap Q1-Q4 2018 [Member]
Derivative [Line Items]
Volume Per Day (Bbls/d) | MBbls	681
Weighted average price paid	Index
Weighted average price received | $ / gal	0.88
Henry Hub Natural Gas Basis Swap Q1 2018 - Q1 2019 [Member]
Derivative [Line Items]
Volume Per Day (MMBtu/d) | MMBTU	122,629
Weighted average price paid	Index
Weighted average price received | $ / MMBTU	2.57