Derivative Financial Instruments (Schedule Of Gas Processing and Fractionation Open Positions) (Details) - EnLink [Member]	12 Months Ended
	Dec. 31, 2016 MMBTU $ / MMBTU $ / gal MBbls
OPIS Mont Belvieu Texas Propane Basis Swap Q1 2017-Q4 2017 [Member]
Derivative [Line Items]
Volume (MBbls) | MBbls	434
Weighted average price paid	Index
Weighted average price received | $ / gal	0.55
OPIS Mont Belvieu Texas Normal Butane Basis Swap Q1 2017-Q4 2017 [Member]
Derivative [Line Items]
Volume (MBbls) | MBbls	161
Weighted average price paid	Index
Weighted average price received | $ / gal	0.70
Henry Hub Natural Gas Basis Swap Q1 2017-Q4 2017 [Member]
Derivative [Line Items]
Volume Per Day (MMBtu/d) | MMBTU	21,685
Weighted average price paid	Index
Weighted average price received, $/MMBtu | $ / MMBTU	3.14