Corporate Structure (Details)	Dec. 31, 2011 Bcfperday miles
Panhandle
Corporate structure [Line Items]
Miles of pipe	10,000
Pipelines capacity	5.5
Southern Union Gas Services
Corporate structure [Line Items]
Miles of pipe	5,600
Cryogenic plants	five
Cryogenic plant capacity	475
Natural gas treating plants	five
Natural gas treating plant capacity	585