Derivative Financial Instruments (Schedule Of Gas Processing and Fractionation Open Positions) (Details) - EnLink [Member]	9 Months Ended
	Sep. 30, 2016 MMBTU $ / bbl $ / MMBTU $ / gal MBbls
OPIS Mont Belvieu Texas Ethane Basis Swap Q4 2016 [Member]
Derivative [Line Items]
Volume (MBbls)	170
Weighted average price paid | $ / gal	0.28
Weighted average price received	Index
OPIS Mont Belvieu Texas Propane Basis Swap Q4 2016-Q3 2017 [Member]
Derivative [Line Items]
Volume (MBbls)	405
Weighted average price paid	Index
Weighted average price received | $ / gal	0.65
OPIS Mont Belvieu Texas Normal Butane Basis Swap Q4 2016-Q3 2017 [Member]
Derivative [Line Items]
Volume (MBbls)	109
Weighted average price paid	Index
Weighted average price received | $ / gal	0.60
OPIS Mont Belvieu Texas Natural Gasoline Basis Swap Q4 2016-Q3 2017 [Member]
Derivative [Line Items]
Volume (MBbls)	113
Weighted average price paid	Index
Weighted average price received | $ / gal	0.98
Henry Hub Natural Gas Basis Swap Q4 2016-Q3 2017 [Member]
Derivative [Line Items]
Volume Per Day (MMBtu/d) | MMBTU	17,438
Weighted average price paid	Index
Weighted average price received, $/MMBtu | $ / MMBTU	2.94
OPIS Mont Belvieu Texas Condensate Basis Swap Q4 2016 [Member]
Derivative [Line Items]
Volume (MBbls)	50
Weighted average price paid	Index
Weighted average price received | $ / bbl	40.20