Debt Obligations (Details) (USD $) In Millions, unless otherwise specified					9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	1 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	1 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended		12 Months Ended		9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	1 Months Ended	9 Months Ended	12 Months Ended	1 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended		1 Months Ended		9 Months Ended
	Sep. 30, 2011		Dec. 31, 2010		Sep. 30, 2011 EPO Senior Notes B [Member]	Dec. 31, 2010 EPO Senior Notes B [Member]	Sep. 30, 2011 EPO Senior Notes S [Member]	Dec. 31, 2010 EPO Senior Notes S [Member]	Sep. 30, 2011 EPO Senior Notes P [Member]	Dec. 31, 2010 EPO Senior Notes P [Member]	Sep. 30, 2011 EPO $1.75 Billion Multi-Year Revolving Credit Facility [Member]	Dec. 31, 2010 EPO $1.75 Billion Multi-Year Revolving Credit Facility [Member]	Sep. 30, 2011 EPO Senior Notes C [Member]	Dec. 31, 2010 EPO Senior Notes C [Member]	Sep. 30, 2011 EPO Senior Notes T [Member]	Dec. 31, 2010 EPO Senior Notes T [Member]	Sep. 30, 2011 EPO Senior Notes M [Member]	Dec. 31, 2010 EPO Senior Notes M [Member]	Sep. 30, 2011 EPO Senior Notes U [Member]	Dec. 31, 2010 EPO Senior Notes U [Member]	Sep. 30, 2011 EPO Senior Notes O [Member]	Dec. 31, 2010 EPO Senior Notes O [Member]	Sep. 30, 2011 EPO Senior Notes G [Member]	Dec. 31, 2010 EPO Senior Notes G [Member]	Sep. 30, 2011 EPO Senior Notes I [Member]	Dec. 31, 2010 EPO Senior Notes I [Member]	Sep. 30, 2011 EPO Senior Notes X [Member]	Dec. 31, 2010 EPO Senior Notes X [Member]	Jan. 31, 2011 EPO Senior Notes AA [Member]	Sep. 30, 2011 EPO Senior Notes AA [Member]	Dec. 31, 2010 EPO Senior Notes AA [Member]	Sep. 30, 2011 EPO $3.5 Billion Multi-Year Revolving Credit Facility [Member]	Dec. 31, 2010 EPO $3.5 Billion Multi-Year Revolving Credit Facility [Member]	Sep. 30, 2011 EPO Senior Notes L [Member]	Dec. 31, 2010 EPO Senior Notes L [Member]	Sep. 30, 2011 EPO Senior Notes V [Member]	Dec. 31, 2010 EPO Senior Notes V [Member]	Sep. 30, 2011 EPO Senior Notes N [Member]	Dec. 31, 2010 EPO Senior Notes N [Member]	Sep. 30, 2011 EPO Senior Notes Q [Member]	Dec. 31, 2010 EPO Senior Notes Q [Member]	Sep. 30, 2011 EPO Senior Notes Y [Member]	Dec. 31, 2010 EPO Senior Notes Y [Member]	Aug. 31, 2011 EPO Senior Notes CC [Member]	Sep. 30, 2011 EPO Senior Notes CC [Member]	Dec. 31, 2010 EPO Senior Notes CC [Member]	Sep. 30, 2011 EPO Senior Notes D [Member]	Dec. 31, 2010 EPO Senior Notes D [Member]	Sep. 30, 2011 EPO Petal GO Zone Bonds [Member]		Dec. 31, 2010 EPO Petal GO Zone Bonds [Member]		Sep. 30, 2011 EPO Senior Notes H [Member]	Dec. 31, 2010 EPO Senior Notes H [Member]	Sep. 30, 2011 EPO Senior Notes J [Member]	Dec. 31, 2010 EPO Senior Notes J [Member]	Sep. 30, 2011 EPO Senior Notes W [Member]	Dec. 31, 2010 EPO Senior Notes W [Member]	Sep. 30, 2011 EPO Senior Notes R [Member]	Dec. 31, 2010 EPO Senior Notes R [Member]	Sep. 30, 2011 EPO Senior Notes Z [Member]	Dec. 31, 2010 EPO Senior Notes Z [Member]	Jan. 31, 2011 EPO Senior Notes BB [Member]	Sep. 30, 2011 EPO Senior Notes BB [Member]	Dec. 31, 2010 EPO Senior Notes BB [Member]	Aug. 31, 2011 EPO Senior Notes DD [Member]	Sep. 30, 2011 EPO Senior Notes DD [Member]	Dec. 31, 2010 EPO Senior Notes DD [Member]	Sep. 30, 2011 TEPPCO Senior Notes 1 [Member]	Dec. 31, 2010 TEPPCO Senior Notes 1 [Member]	Sep. 30, 2011 TEPPCO Senior Notes 2 [Member]	Dec. 31, 2010 TEPPCO Senior Notes 2 [Member]	Sep. 30, 2011 TEPPCO Senior Notes 3 [Member]	Dec. 31, 2010 TEPPCO Senior Notes 3 [Member]	Sep. 30, 2011 TEPPCO Senior Notes 4 [Member]	Dec. 31, 2010 TEPPCO Senior Notes 4 [Member]	Sep. 30, 2011 TEPPCO Senior Notes 5 [Member]	Dec. 31, 2010 TEPPCO Senior Notes 5 [Member]	Sep. 30, 2011 DEP Term Loan [Member]	Dec. 31, 2010 DEP Term Loan [Member]	Sep. 30, 2011 DEP $850 Million Multi-Year Revolving Credit Facility [Member]	Dec. 31, 2010 DEP $850 Million Multi-Year Revolving Credit Facility [Member]	Sep. 30, 2011 DEP $400 Million Term Loan Facility [Member]	Dec. 31, 2010 DEP $400 Million Term Loan Facility [Member]	Sep. 30, 2011 EPO Junior Subordinated Notes A [Member]	Dec. 31, 2010 EPO Junior Subordinated Notes A [Member]	Sep. 30, 2011 EPO Junior Subordinated Notes C [Member]	Dec. 31, 2010 EPO Junior Subordinated Notes C [Member]	Sep. 30, 2011 EPO Junior Subordinated Notes B [Member]	Dec. 31, 2010 EPO Junior Subordinated Notes B [Member]	Sep. 30, 2011 TEPPCO Junior Subordinated Notes [Member]	Dec. 31, 2010 TEPPCO Junior Subordinated Notes [Member]	Dec. 31, 2010 Canadian Revolving Credit Facility [Member]	Mar. 31, 2011 Evangeline [Member] Subordinated Note Payable [Member]	Sep. 30, 2011 Poseidon Oil Pipeline Company, LLC [Member]	Sep. 30, 2011 Poseidon Oil Pipeline Company, LLC [Member] Replacement Credit Facility [Member]	Sep. 30, 2011 Centennial Pipeline LLC [Member]	Sep. 30, 2011 Unconsolidated Affiliates Debt [Member]	Sep. 30, 2011 Total principal amount of senior debt obligations [Member]	Dec. 31, 2010 Total principal amount of senior debt obligations [Member]	Sep. 30, 2011 Revolving Credit Facility [Member]	Sep. 30, 2011 Senior Notes [Member]	Sep. 30, 2011 Junior Subordinated Notes [Member]
Debt Instrument [Line Items]
Principal Outstanding	$ 15,052.7		$ 13,526.5		$ 0	$ 450.0	$ 490.5	$ 490.5	$ 500.0	$ 500.0	$ 0	$ 648.0	$ 350.0	$ 350.0	$ 182.5	$ 182.5	$ 400.0	$ 400.0	$ 237.6	$ 237.6	$ 500.0	$ 500.0	$ 650.0	$ 650.0	$ 250.0	$ 250.0	$ 400.0	$ 400.0		$ 750.0	$ 0	$ 720.0	$ 0	$ 800.0	$ 800.0	$ 349.7	$ 349.7	$ 700.0	$ 700.0	$ 500.0	$ 500.0	$ 1,000.0	$ 1,000.0		$ 650.0	$ 0	$ 500.0	$ 500.0	$ 0	[1]	$ 57.5	[1]	$ 350.0	$ 350.0	$ 250.0	$ 250.0	$ 399.6	$ 399.6	$ 600.0	$ 600.0	$ 600.0	$ 600.0		$ 750.0	$ 0		$ 600.0	$ 0	$ 9.5	$ 9.5	$ 17.5	$ 17.5	$ 12.4	$ 12.4	$ 0.3	$ 0.3	$ 0.4	$ 0.4	$ 0	$ 282.3	$ 0	$ 106.0	$ 0	$ 400.0	$ 550.0	$ 550.0	$ 285.8	$ 285.8	$ 682.7	$ 682.7	$ 14.2	$ 14.2	$ 0		$ 92.0		$ 104.2	$ 196.2	$ 13,520.0	$ 11,993.8	$ 720.0	$ 12,800.0	$ 1,532.7
Other, non-principal amounts:
Change in fair value of debt hedged in fair value hedging relationship	81.5	[2]	49.3	[2]
Unamortized discounts, net of premiums	(30.4)		(24.0)
Unamortized deferred net gains related to terminated interest rate swaps	4.9	[2]	11.7	[2]
Total other, non-principal amounts	56.0		37.0
Less current maturities of debt	(1,000.0)	[3]	(282.3)	[3]
Total long-term debt	14,108.7		13,281.2
Interest Rate Terms					fixed	fixed	fixed	fixed	fixed	fixed	variable	variable	fixed	fixed	fixed	fixed	fixed	fixed	fixed	fixed	fixed	fixed	fixed	fixed	fixed	fixed	fixed	fixed		fixed	fixed	variable	variable	fixed	fixed	fixed	fixed	fixed	fixed	fixed	fixed	fixed	fixed		fixed	fixed	fixed	fixed	variable		variable		fixed	fixed	fixed	fixed	fixed	fixed	fixed	fixed	fixed	fixed		fixed	fixed		fixed	fixed	fixed	fixed	fixed	fixed	fixed	fixed	fixed	fixed	fixed	fixed	variable	variable	variable	variable	variable	variable	fixed/variable	fixed/variable	fixed/variable	fixed/variable	fixed/variable	fixed/variable	fixed/variable	fixed/variable
Interest Rate, stated percentage (in hundredths)					7.50%	7.50%	7.625%	7.625%	4.60%	4.60%			6.375%	6.375%	6.125%	6.125%	5.65%	5.65%	5.90%	5.90%	9.75%	9.75%	5.60%	5.60%	5.00%	5.00%	3.70%	3.70%		3.20%	3.20%			6.30%	6.30%	6.65%	6.65%	6.50%	6.50%	5.25%	5.25%	5.20%	5.20%		4.05%	4.05%	6.875%	6.875%					6.65%	6.65%	5.75%	5.75%	7.55%	7.55%	6.125%	6.125%	6.45%	6.45%		5.95%	5.95%		5.70%	5.70%	7.625%	7.625%	6.125%	6.125%	5.90%	5.90%	6.65%	6.65%	7.55%	7.55%
Maturity Date					February 2011	February 2011	February 2012	February 2012	August 2012	August 2012			February 2013	February 2013	February 2013	February 2013	April 2013	April 2013	April 2013	April 2013	January 2014	January 2014	October 2014	October 2014	March 2015	March 2015	June 2015	June 2015		February 2016	February 2016			September 2017	September 2017	April 2018	April 2018	January 2019	January 2019	January 2020	January 2020	September 2020	September 2020		February 2022	February 2022	March 2033	March 2033	August 2034		August 2034		October 2034	October 2034	March 2035	March 2035	April 2038	April 2038	October 2039	October 2039	September 2040	September 2040		February 2041	February 2041		February 2042	February 2042	February 2012	February 2012	February 2013	February 2013	April 2013	April 2013	April 2018	April 2018	April 2038	April 2038	December 2011	December 2011			October 2013	October 2013	August 2066	August 2066	June 2067	June 2067	January 2068	January 2068	June 2067	June 2067
Maturity date of credit facility											November 2012	November 2012																				September 2016	September 2016																																																October 2013	October 2013														April 2015
EPO Letter of credit related to commodity derivative instruments	87.5
EPO Letter of credit related to Petal GO Zone Bonds	58.3
Maximum borrowing capacity												1,750																				3,500																																																		850											30			175
Current borrowing capacity																																																																																																125
Number of extensions to maturity date which may be requested																																2
Length of extensions to maturity date (in years)																																1Y
Maximum bank commitments increase																																500
Aggregate debt principal issued																													750.0															650.0																			750.0			600.0
Maturity Term																													5Y															10Y																			30Y			30Y
Debt issued at percent of principal amount (in hundredths)																													99.901%															99.79%																			99.317%			99.887%
Information regarding variable interest rates paid [Abstract]
Variable Interest Rates Paid, Minimum (in hundredths)											0.69%																					1.60%																	0.06%																														1.06%		2.01%		2.26%
Variable Interest Rates Paid, Maximum (in hundredths)											3.25%																					3.63%																	0.33%																														1.42%		2.43%		2.97%
Weighted-Average Interest Rate Paid (in hundredths)											0.79%																					1.60%																	0.20%																														1.21%		2.22%		2.55%
Debt Obligations of Unconsolidated Affiliates [Abstract]
Basis of total debt to the unconsolidated affiliate (in hundredths)	100.00%
Ownership Interest (in hundredths)																																																																																															36.00%		50.00%
Scheduled Maturities of Debt [Abstract]
Remainder of 2011																																																																																															0		2.3	2.3
2012	1,000.0																																																																																														0		8.9	8.9			0	1,000.0	0
2013	1,200.0																																																																																														0		8.6	8.6			0	1,200.0	0
2014	1,150.0																																																																																														0		8.6	8.6			0	1,150.0	0
2015	650.0																																																																																														92.0		8.6	100.6			0	650.0	0
After 2015	11,052.7																																																																																														0		67.2	67.2			720.0	8,800.0	1,532.7
Total	15,052.7		13,526.5		0	450.0	490.5	490.5	500.0	500.0	0	648.0	350.0	350.0	182.5	182.5	400.0	400.0	237.6	237.6	500.0	500.0	650.0	650.0	250.0	250.0	400.0	400.0		750.0	0	720.0	0	800.0	800.0	349.7	349.7	700.0	700.0	500.0	500.0	1,000.0	1,000.0		650.0	0	500.0	500.0	0	[1]	57.5	[1]	350.0	350.0	250.0	250.0	399.6	399.6	600.0	600.0	600.0	600.0		750.0	0		600.0	0	9.5	9.5	17.5	17.5	12.4	12.4	0.3	0.3	0.4	0.4	0	282.3	0	106.0	0	400.0	550.0	550.0	285.8	285.8	682.7	682.7	14.2	14.2	0		92.0		104.2	196.2	13,520.0	11,993.8	720.0	12,800.0	1,532.7
Final payment																																																																																														$ 3.2

[1] See Note 6 for information concerning the reclassification of Petal GO Zone Bonds to liabilities related to assets held for sale.

[2] See Note 4 for information regarding our interest rate hedging activities.

[3] We expect to refinance the current maturities of our debt obligations prior to their maturity.