Debt Obligations (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended							12 Months Ended							12 Months Ended		12 Months Ended		12 Months Ended		12 Months Ended		12 Months Ended		12 Months Ended		12 Months Ended		12 Months Ended		12 Months Ended		12 Months Ended		12 Months Ended			12 Months Ended		12 Months Ended		12 Months Ended		12 Months Ended		12 Months Ended		12 Months Ended		12 Months Ended		12 Months Ended		12 Months Ended		12 Months Ended		12 Months Ended		12 Months Ended		12 Months Ended		12 Months Ended		12 Months Ended		12 Months Ended		12 Months Ended			12 Months Ended			12 Months Ended		12 Months Ended		12 Months Ended		12 Months Ended		12 Months Ended		12 Months Ended			12 Months Ended			12 Months Ended			12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010	Dec. 31, 2012 Total principal amount of senior debt obligations [Member]	Dec. 31, 2011 Total principal amount of senior debt obligations [Member]	Dec. 31, 2012 Senior Notes [Member]	Dec. 31, 2011 Senior Notes [Member]	Dec. 31, 2010 Senior Notes [Member]	Dec. 31, 2012 Commercial Paper [Member]	Dec. 31, 2011 Commercial Paper [Member]	Dec. 31, 2012 Commercial Paper [Member] Minimum [Member]	Dec. 31, 2012 Commercial Paper [Member] Maximum [Member]	Dec. 31, 2012 EPO Senior Notes S [Member]	Dec. 31, 2011 EPO Senior Notes S [Member]	Dec. 31, 2012 EPO Senior Notes P [Member]	Dec. 31, 2011 EPO Senior Notes P [Member]	Dec. 31, 2012 EPO Senior Notes C [Member]	Dec. 31, 2011 EPO Senior Notes C [Member]	Dec. 31, 2012 EPO Senior Notes T [Member]	Dec. 31, 2011 EPO Senior Notes T [Member]	Dec. 31, 2012 EPO Senior Notes M [Member]	Dec. 31, 2011 EPO Senior Notes M [Member]	Dec. 31, 2012 EPO Senior Notes U [Member]	Dec. 31, 2011 EPO Senior Notes U [Member]	Dec. 31, 2012 EPO Senior Notes O [Member]	Dec. 31, 2011 EPO Senior Notes O [Member]	Dec. 31, 2012 EPO Senior Notes G [Member]	Dec. 31, 2011 EPO Senior Notes G [Member]	Dec. 31, 2012 EPO Senior Notes I [Member]	Dec. 31, 2011 EPO Senior Notes I [Member]	Dec. 31, 2012 EPO Senior Notes X [Member]	Dec. 31, 2011 EPO Senior Notes X [Member]	Dec. 31, 2012 EPO Senior Notes FF [Member]	Aug. 31, 2012 EPO Senior Notes FF [Member]	Dec. 31, 2011 EPO Senior Notes FF [Member]	Dec. 31, 2012 EPO Senior Notes AA [Member]	Dec. 31, 2011 EPO Senior Notes AA [Member]	Dec. 31, 2012 EPO $3.5 Billion Multi-Year Revolving Credit Facility [Member]	Dec. 31, 2011 EPO $3.5 Billion Multi-Year Revolving Credit Facility [Member]	Dec. 31, 2012 EPO Senior Notes L [Member]	Dec. 31, 2011 EPO Senior Notes L [Member]	Dec. 31, 2012 EPO Senior Notes V [Member]	Dec. 31, 2011 EPO Senior Notes V [Member]	Dec. 31, 2012 EPO Senior Notes N [Member]	Dec. 31, 2011 EPO Senior Notes N [Member]	Dec. 31, 2012 EPO Senior Notes Q [Member]	Dec. 31, 2011 EPO Senior Notes Q [Member]	Dec. 31, 2012 EPO Senior Notes Y [Member]	Dec. 31, 2011 EPO Senior Notes Y [Member]	Dec. 31, 2012 EPO Senior Notes CC [Member]	Dec. 31, 2011 EPO Senior Notes CC [Member]	Dec. 31, 2012 EPO Senior Notes D [Member]	Dec. 31, 2011 EPO Senior Notes D [Member]	Dec. 31, 2012 EPO Senior Notes H [Member]	Dec. 31, 2011 EPO Senior Notes H [Member]	Dec. 31, 2012 EPO Senior Notes J [Member]	Dec. 31, 2011 EPO Senior Notes J [Member]	Dec. 31, 2012 EPO Senior Notes W [Member]	Dec. 31, 2011 EPO Senior Notes W [Member]	Dec. 31, 2012 EPO Senior Notes R [Member]	Dec. 31, 2011 EPO Senior Notes R [Member]	Dec. 31, 2012 EPO Senior Notes Z [Member]	Dec. 31, 2011 EPO Senior Notes Z [Member]	Dec. 31, 2012 EPO Senior Notes BB [Member]	Dec. 31, 2011 EPO Senior Notes BB [Member]	Dec. 31, 2012 EPO Senior Notes DD [Member]	Dec. 31, 2011 EPO Senior Notes DD [Member]	Dec. 31, 2012 EPO Senior Notes EE [Member]	Feb. 29, 2012 EPO Senior Notes EE [Member]	Dec. 31, 2011 EPO Senior Notes EE [Member]	Dec. 31, 2012 EPO Senior Notes GG [Member]	Aug. 31, 2012 EPO Senior Notes GG [Member]	Dec. 31, 2011 EPO Senior Notes GG [Member]	Dec. 31, 2012 TEPPCO Senior Notes 1 [Member]	Dec. 31, 2011 TEPPCO Senior Notes 1 [Member]	Dec. 31, 2012 TEPPCO Senior Notes 2 [Member]	Dec. 31, 2011 TEPPCO Senior Notes 2 [Member]	Dec. 31, 2012 TEPPCO Senior Notes 3 [Member]	Dec. 31, 2011 TEPPCO Senior Notes 3 [Member]	Dec. 31, 2012 TEPPCO Senior Notes 4 [Member]	Dec. 31, 2011 TEPPCO Senior Notes 4 [Member]	Dec. 31, 2012 TEPPCO Senior Notes 5 [Member]	Dec. 31, 2011 TEPPCO Senior Notes 5 [Member]	Dec. 31, 2012 EPO Junior Subordinated Notes A [Member]		Dec. 31, 2011 EPO Junior Subordinated Notes A [Member]	Dec. 31, 2012 EPO Junior Subordinated Notes C [Member]		Dec. 31, 2011 EPO Junior Subordinated Notes C [Member]	Dec. 31, 2012 EPO Junior Subordinated Notes B [Member]		Dec. 31, 2011 EPO Junior Subordinated Notes B [Member]	Dec. 31, 2012 TEPPCO Junior Subordinated Notes [Member]	Dec. 31, 2011 TEPPCO Junior Subordinated Notes [Member]
Debt Instrument [Line Items]
Principal Outstanding	$ 16,179.3		$ 14,482.7			$ 14,646.6	$ 12,950.0	$ 14,300.0			$ 346.6	$ 0			$ 0	$ 490.5	$ 0	$ 500.0	$ 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	$ 650.0		$ 0	$ 750.0	$ 750.0	$ 0	$ 150.0	$ 800.0	$ 800.0	$ 349.7	$ 349.7	$ 700.0	$ 700.0	$ 500.0	$ 500.0	$ 1,000.0	$ 1,000.0	$ 650.0	$ 650.0	$ 500.0	$ 500.0	$ 350.0	$ 350.0	$ 250.0	$ 250.0	$ 399.6	$ 399.6	$ 600.0	$ 600.0	$ 600.0	$ 600.0	$ 750.0	$ 750.0	$ 600.0	$ 600.0	$ 750.0		$ 0	$ 1,100.0		$ 0	$ 0	$ 9.5	$ 17.5	$ 17.5	$ 12.4	$ 12.4	$ 0.3	$ 0.3	$ 0.4	$ 0.4	$ 550.0		$ 550.0	$ 285.8		$ 285.8	$ 682.7		$ 682.7	$ 14.2	$ 14.2
Other, non-principal amounts:
Change in fair value of debt hedged in fair value hedging relationship	39.3	[1]	73.8	[1]
Unamortized discounts, net of premiums	(38)		(30)
Other	21.2		2.9
Total other, non-principal amounts	22.5		46.7
Less current maturities of debt	(1,546.6)	[2]	(500.0)
Total long-term debt	14,655.2		14,029.4
Debt Obligations Terms [Abstract]
Interest Rate Terms											fixed				fixed		fixed		fixed		fixed		fixed		fixed		fixed		fixed		fixed		fixed		fixed			fixed		variable		fixed		fixed		fixed		fixed		fixed		fixed		fixed		fixed		fixed		fixed		fixed		fixed		fixed		fixed		fixed			fixed			fixed		fixed		fixed		fixed		fixed		fixed/variable			fixed/variable			fixed/variable			fixed/variable
Interest Rate, stated percentage (in hundredths)													0.30%	0.50%	7.625%		4.60%		6.375%		6.125%		5.65%		5.90%		9.75%		5.60%		5.00%		3.70%		1.25%			3.20%				6.30%		6.65%		6.50%		5.25%		5.20%		4.05%		6.875%		6.65%		5.75%		7.55%		6.125%		6.45%		5.95%		5.70%		4.85%			4.45%			7.625%		6.125%		5.90%		6.65%		7.55%		8.375%	[3]		7.00%	[4]		7.034%	[5]
Maturity Date											January 2013				February 2012		August 2012		February 2013		February 2013		April 2013		April 2013		January 2014		October 2014		March 2015		June 2015		August 2015			February 2016		September 2016		September 2017		April 2018		January 2019		January 2020		September 2020		February 2022		March 2033		October 2034		March 2035		April 2038		October 2039		September 2040		February 2041		February 2042		August 2042			February 2043			February 2012		February 2013		April 2013		April 2018		April 2038		August 2066			June 2067			January 2068			June 2067
Maximum borrowing capacity											2,000																													3,500
Number of extensions to maturity date which may be requested																																								2
Length of extensions to maturity date (in years)																																								1
Maximum bank commitments increase																																								500
Aggregate debt principal issued																																				650.0																																			750.0			1,100.0
Aggregate debt borrowed during period	8,363.1		8,324.1		6,484.4			2,500.0	2,750.0	2,000.0
Maturity term (in years)																																			3																																			30			30
Debt issued as percent of principal amount (in hundredths)																																				99.941%																																			99.542%			99.47%
Date through which interest rate is fixed																																																																																						August 2016	[3]		June 2017	[4]		January 2018	[5]
Variable annual interest rate thereafter, variable rate basis																																																																																						3-month LIBOR rate	[6]		3-month LIBOR rate	[7]		3-month LIBOR rate	[8]
Variable interest rate (in hundredths)																																																																																						3.708%	[6]		2.778%	[7]		2.68%	[8]
Minimum variable annual interest rate (in hundredths)																																																																																												7.034%	[8]
EPO Letter of credit related to commodity derivative instruments																																								$ 37.5
Information regarding variable interest rates paid [Abstract]
Variable Interest Rates Paid, Minimum (in hundredths)																																								1.51%
Variable Interest Rates Paid, Maximum (in hundredths)																																								3.63%
Weighted-Average Interest Rate Paid (in hundredths)																																								1.59%

[1] See Note 6 for information regarding our interest rate hedging activities.

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

[3] Interest is payable semi-annually in arrears in February and August of each year, which commenced in February 2007.

[4] Interest is payable semi-annually in arrears in June and December of each year, which commenced in December 2009.

[5] Interest is payable semi-annually in arrears in January and July of each year, which commenced in January 2008.

[6] Interest is payable quarterly in arrears in February, May, August and November of each year commencing in November 2016.

[7] Interest is payable quarterly in arrears in March, June, September and December of each year commencing in June 2017.

[8] Interest is payable quarterly in arrears in January, April, July and October of each year commencing in April 2018.