Equity and Distributions (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012		Mar. 31, 2011	Dec. 31, 2011
Net Cash Proceeds from Sale of Common Units [Abstract]
Net cash proceeds from issuance of common units	$ 29.0		$ 21.0
Accumulated Other Comprehensive Income (Loss) [Abstract]
Commodity derivative instruments	(59.0)	[1]		(21.4)	[1]
Interest rate derivative instruments	(297.4)	[1]		(329.0)	[1]
Foreign currency translation adjustment	1.7	[2]		1.7	[2]
Pension and postretirement benefit plans	(2.9)			(1.7)
Proportionate share of other comprehensive loss of Energy Transfer Equity	0			(1)
Unrealized gain on investment in available-for-sale equity securities	15.8	[3]		0	[3]
Accumulated other comprehensive loss	(341.8)			(351.4)
Components of noncontrolling interests [Abstract]
Joint venture partners	109.5	[4]		105.9	[4]
Components of net income attributable to noncontrolling interests [Abstract]
Former owners of Duncan Energy Partners	0		7.9
Joint venture partners	4.2		5.9
Total	4.2		13.8
Cash distributions paid to noncontrolling interests:
Former owners of Duncan Energy Partners	0		10.9
Joint venture partners	6.6		6.3
Total cash distributions paid to noncontrolling interests	6.6		17.2
Cash contributions from noncontrolling interests:
Former owners of Duncan Energy Partners	0		0.6
Joint venture partners	4.9		0.7
Total cash contributions from noncontrolling interests	4.9		1.3
Cash Distribution [Member] | Enterprise [Member]
Distributions to Partners [Abstract]
Distribution Per Common Unit (in dollars per unit)	$ 0.6275
Record Date	Apr. 30, 2012
Payment Date	May 09, 2012
Number of Designated Units (in units)	26,130,000
Distribution Reinvestment Plan [Member]
Summary of changes in outstanding units [Roll Forward]
Common units issued in connection with DRIP and EUPP (in units)	667,095
Registration Statements and Equity Offerings [Line Items]
Maximum common units authorized for issuance (in units)	70,000,000
Remaining units available for issuance (in units)	25,506,188
Net Cash Proceeds from Sale of Common Units [Abstract]
Number of Common Units Issued (in units)	667,095
Net cash proceeds from issuance of common units	31.8
Enterprise EUPP [Member]
Summary of changes in outstanding units [Roll Forward]
Common units issued in connection with DRIP and EUPP (in units)	24,841
Registration Statements and Equity Offerings [Line Items]
Maximum common units authorized for issuance (in units)	440,879
Remaining units available for issuance (in units)	405,864
Net Cash Proceeds from Sale of Common Units [Abstract]
Number of Common Units Issued (in units)	24,841
Net cash proceeds from issuance of common units	1.2
2012 Registration [Member]
Registration Statements and Equity Offerings [Line Items]
Maximum common units authorized for issuance	$ 1,000
Common units [Member]
Summary of changes in outstanding units [Roll Forward]
Beginning Balance (in units)	881,620,418
Common units issued in connection with DRIP and EUPP (in units)	691,936
Common units issued in connection with equity-based awards (in units)	201,925
Restricted common units issued (in units)	1,529,438
Forfeiture of restricted common units (in units)	(24,800)
Acquisition of treasury units in connection with equity-based awards (in units)	(187,343)
Cancellation of treasury units (in units)	0
Ending Balance (in units)	883,831,574
Conversion of restricted units to common units (in units)	632,298
Net Cash Proceeds from Sale of Common Units [Abstract]
Number of Common Units Issued (in units)	691,936
Class B units [Member]
Summary of changes in outstanding units [Roll Forward]
Beginning Balance (in units)	4,520,431
Common units issued in connection with DRIP and EUPP (in units)	0
Common units issued in connection with equity-based awards (in units)	0
Restricted common units issued (in units)	0
Forfeiture of restricted common units (in units)	0
Acquisition of treasury units in connection with equity-based awards (in units)	0
Cancellation of treasury units (in units)	0
Ending Balance (in units)	4,520,431
Net Cash Proceeds from Sale of Common Units [Abstract]
Number of Common Units Issued (in units)	0
Treasury Units [Member]
Summary of changes in outstanding units [Roll Forward]
Beginning Balance (in units)	0
Common units issued in connection with DRIP and EUPP (in units)	0
Common units issued in connection with equity-based awards (in units)	0
Restricted common units issued (in units)	0
Forfeiture of restricted common units (in units)	0
Acquisition of treasury units in connection with equity-based awards (in units)	187,343
Cancellation of treasury units (in units)	(187,343)
Ending Balance (in units)	0
Net Cash Proceeds from Sale of Common Units [Abstract]
Number of Common Units Issued (in units)	0

[1] See Note 4 for additional information regarding these components of accumulated other comprehensive income (loss).

[2] Relates to transactions of our Canadian NGL marketing subsidiary.

[3] Relates to our investment in Energy Transfer Equity common units, which is accounted for as available-for-sale at March 31, 2012. This investment was accounted for using the equity method at December 31, 2011 through January 18, 2012.

[4] 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.