Debt Obligations (Details) (USD $) In Millions, unless otherwise specified										9 Months Ended		9 Months Ended		9 Months Ended		9 Months Ended		9 Months Ended		9 Months Ended		9 Months Ended		9 Months Ended		9 Months Ended		9 Months Ended		9 Months Ended			9 Months Ended		9 Months Ended		9 Months Ended		9 Months Ended		9 Months Ended		9 Months Ended		9 Months Ended		9 Months Ended		9 Months Ended		9 Months Ended		9 Months Ended		9 Months Ended		9 Months Ended		9 Months Ended		9 Months Ended		9 Months Ended		9 Months Ended			9 Months Ended			9 Months Ended		9 Months Ended		9 Months Ended		9 Months Ended		9 Months Ended		9 Months Ended		9 Months Ended		9 Months Ended		9 Months Ended
	Sep. 30, 2012		Dec. 31, 2011		Sep. 30, 2012 Total principal amount of senior debt obligations [Member]	Dec. 31, 2011 Total principal amount of senior debt obligations [Member]	Sep. 30, 2012 Revolving Credit Facility [Member]	Sep. 30, 2012 Senior Notes [Member]	Sep. 30, 2012 Junior Subordinated Notes [Member]	Sep. 30, 2012 EPO Senior Notes S [Member]	Dec. 31, 2011 EPO Senior Notes S [Member]	Sep. 30, 2012 EPO Senior Notes P [Member]	Dec. 31, 2011 EPO Senior Notes P [Member]	Sep. 30, 2012 EPO Senior Notes C [Member]	Dec. 31, 2011 EPO Senior Notes C [Member]	Sep. 30, 2012 EPO Senior Notes T [Member]	Dec. 31, 2011 EPO Senior Notes T [Member]	Sep. 30, 2012 EPO Senior Notes M [Member]	Dec. 31, 2011 EPO Senior Notes M [Member]	Sep. 30, 2012 EPO Senior Notes U [Member]	Dec. 31, 2011 EPO Senior Notes U [Member]	Sep. 30, 2012 EPO Senior Notes O [Member]	Dec. 31, 2011 EPO Senior Notes O [Member]	Sep. 30, 2012 EPO Senior Notes G [Member]	Dec. 31, 2011 EPO Senior Notes G [Member]	Sep. 30, 2012 EPO Senior Notes I [Member]	Dec. 31, 2011 EPO Senior Notes I [Member]	Sep. 30, 2012 EPO Senior Notes X [Member]	Dec. 31, 2011 EPO Senior Notes X [Member]	Sep. 30, 2012 EPO Senior Notes FF [Member]	Aug. 31, 2012 EPO Senior Notes FF [Member]	Dec. 31, 2011 EPO Senior Notes FF [Member]	Sep. 30, 2012 EPO Senior Notes AA [Member]	Dec. 31, 2011 EPO Senior Notes AA [Member]	Sep. 30, 2012 EPO $3.5 Billion Multi-Year Revolving Credit Facility [Member]	Dec. 31, 2011 EPO $3.5 Billion Multi-Year Revolving Credit Facility [Member]	Sep. 30, 2012 EPO Senior Notes L [Member]	Dec. 31, 2011 EPO Senior Notes L [Member]	Sep. 30, 2012 EPO Senior Notes V [Member]	Dec. 31, 2011 EPO Senior Notes V [Member]	Sep. 30, 2012 EPO Senior Notes N [Member]	Dec. 31, 2011 EPO Senior Notes N [Member]	Sep. 30, 2012 EPO Senior Notes Q [Member]	Dec. 31, 2011 EPO Senior Notes Q [Member]	Sep. 30, 2012 EPO Senior Notes Y [Member]	Dec. 31, 2011 EPO Senior Notes Y [Member]	Sep. 30, 2012 EPO Senior Notes CC [Member]	Dec. 31, 2011 EPO Senior Notes CC [Member]	Sep. 30, 2012 EPO Senior Notes D [Member]	Dec. 31, 2011 EPO Senior Notes D [Member]	Sep. 30, 2012 EPO Senior Notes H [Member]	Dec. 31, 2011 EPO Senior Notes H [Member]	Sep. 30, 2012 EPO Senior Notes J [Member]	Dec. 31, 2011 EPO Senior Notes J [Member]	Sep. 30, 2012 EPO Senior Notes W [Member]	Dec. 31, 2011 EPO Senior Notes W [Member]	Sep. 30, 2012 EPO Senior Notes R [Member]	Dec. 31, 2011 EPO Senior Notes R [Member]	Sep. 30, 2012 EPO Senior Notes Z [Member]	Dec. 31, 2011 EPO Senior Notes Z [Member]	Sep. 30, 2012 EPO Senior Notes BB [Member]	Dec. 31, 2011 EPO Senior Notes BB [Member]	Sep. 30, 2012 EPO Senior Notes DD [Member]	Dec. 31, 2011 EPO Senior Notes DD [Member]	Sep. 30, 2012 EPO Senior Notes EE [Member]	Feb. 29, 2012 EPO Senior Notes EE [Member]	Dec. 31, 2011 EPO Senior Notes EE [Member]	Sep. 30, 2012 EPO Senior Notes GG [Member]	Aug. 31, 2012 EPO Senior Notes GG [Member]	Dec. 31, 2011 EPO Senior Notes GG [Member]	Sep. 30, 2012 TEPPCO Senior Notes 1 [Member]	Dec. 31, 2011 TEPPCO Senior Notes 1 [Member]	Sep. 30, 2012 TEPPCO Senior Notes 2 [Member]	Dec. 31, 2011 TEPPCO Senior Notes 2 [Member]	Sep. 30, 2012 TEPPCO Senior Notes 3 [Member]	Dec. 31, 2011 TEPPCO Senior Notes 3 [Member]	Sep. 30, 2012 TEPPCO Senior Notes 4 [Member]	Dec. 31, 2011 TEPPCO Senior Notes 4 [Member]	Sep. 30, 2012 TEPPCO Senior Notes 5 [Member]	Dec. 31, 2011 TEPPCO Senior Notes 5 [Member]	Sep. 30, 2012 EPO Junior Subordinated Notes A [Member]	Dec. 31, 2011 EPO Junior Subordinated Notes A [Member]	Sep. 30, 2012 EPO Junior Subordinated Notes C [Member]	Dec. 31, 2011 EPO Junior Subordinated Notes C [Member]	Sep. 30, 2012 EPO Junior Subordinated Notes B [Member]	Dec. 31, 2011 EPO Junior Subordinated Notes B [Member]	Sep. 30, 2012 TEPPCO Junior Subordinated Notes [Member]	Dec. 31, 2011 TEPPCO Junior Subordinated Notes [Member]	Aug. 31, 2012 Commercial Paper [Member]
Debt Instrument [Line Items]
Principal Outstanding	$ 15,917.7		$ 14,482.7		$ 14,385.0	$ 12,950.0	$ 85.0	$ 14,300.0	$ 1,532.7	$ 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	$ 85.0	$ 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	42.7	[1]	73.8	[1]
Unamortized discounts, net of premiums	(38.4)		(30.0)
Unamortized deferred net gains related to terminated interest rate swaps	25.2	[1]	2.9	[1]
Total other, non-principal amounts	29.5		46.7
Less current maturities of debt	(1,200.0)		(500.0)
Total long-term debt	14,747.2		14,029.4
Interest Rate Terms										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)										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%
Maturity Date										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
Scheduled Maturities of Debt [Abstract]
Remainder of 2012	0						0	0	0
2013	1,200.0						0	1,200.0	0
2014	1,150.0						0	1,150.0	0
2015	1,300.0						0	1,300.0	0
2016	835.0						85.0	750.0	0
After 2016	11,432.7						0	9,900.0	1,532.7
Total	15,917.7		14,482.7		14,385.0	12,950.0	85.0	14,300.0	1,532.7	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	85.0	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
Aggregate debt principal issued																															650.0																																			750.0			1,100.0
EPO Letter of credit related to commodity derivative instruments																																			37.5
Maximum borrowing capacity																																			$ 3,500																																																						$ 2,000
Debt issued as percent of principal amount (in hundredths)																															99.941%																																			99.542%			99.47%
Maturity term (in years)																														3																																			30			30
Information regarding variable interest rates paid [Abstract]
Variable Interest Rates Paid, Minimum (in hundredths)																																			1.52%
Variable Interest Rates Paid, Maximum (in hundredths)																																			3.63%
Weighted-Average Interest Rate Paid (in hundredths)																																			1.57%

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