Equity and Distributions, Noncontrolling Interests (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Components of noncontrolling interests [Abstract]
Joint venture partners	$ 108.3	[1]	$ 105.9	[1]
Components of net income attributable to noncontrolling interests [Abstract]
Limited partners of Enterprise other than Holdings (prior to Holdings Merger)	0		0		1,000.3
Limited partners of Duncan Energy Partners other than EPO and its subsidiaries (prior to Duncan Merger)	0		20.9		37.1
Joint venture partners	8.1		20.5		25.5
Total	8.1		41.4		1,062.9
Cash distributions paid to noncontrolling interests:
Limited partners of Enterprise (prior to Holdings Merger)	0		0		1,395.1
Limited partners of Duncan Energy Partners other than EPO and its subsidiaries (prior to Duncan Merger)	0		32.9		42.9
Joint venture partners	13.3		27.8		29.8
Total	13.3		60.7		1,467.8
Cash contributions from noncontrolling interests:
Limited partners of Enterprise (prior to Holdings Merger)	0		0		1,092.0
Limited partners of Duncan Energy Partners other than EPO and its subsidiaries (prior to Duncan Merger)	0		2.6		1.7
Joint venture partners	6.6		5.9		2.8
Total	$ 6.6		$ 8.5		$ 1,096.5

[1] Represents third party ownership interests in joint ventures that we consolidate, including Tri-States NGL Pipeline L.L.C., Independence Hub LLC, Rio Grande Pipeline Company and Wilprise Pipeline Company LLC.