Partnership Operations, Organization and Basis of Presentation (Details)	12 Months Ended
	Dec. 31, 2013 Segment Fractionator Platform bbl mi Plant ft3	Dec. 31, 2011 Duncan Merger [Member] Common units [Member]
Partnership Operations, Organization and Basis of Presentation [Abstract]
Number of miles of onshore and offshore pipelines	51,000
Number of barrels of storage capacity	200,000,000
Number of cubic feet of storage capacity	14,000,000,000
Number of natural gas processing plants	24
Number of fractionators	22
Number of offshore hub platforms	6
Number of reportable segments	5
Limited partners ownership interest (in hundredths)	100.00%
Mergers [Line Items]
Common unit exchange ratio in connection with merger		1.01
Common units issued in connection with merger (in units)		24,277,310