Debt Obligations (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015		Dec. 31, 2014
Debt Instrument [Line Items]
Principal Outstanding	$ 21,620.7		$ 21,389.2
Other, non-principal amounts	(28.7)		(25.4)
Less current maturities of debt	(1,399.8)	[1]	(2,206.4)	[1]
Total long-term debt	20,192.2		19,157.4
Debt Obligations Terms [Abstract]
Letters of credit outstanding for facilities and motor fuel tax obligations	2.5
EPO Senior Notes I [Member]
Debt Obligations Terms [Abstract]
Repayment of senior notes	250.0
Senior Debt Obligations [Member]
Debt Instrument [Line Items]
Principal Outstanding	20,088.0		19,856.5
Senior Debt Obligations [Member] | Commercial Paper Notes [Member]
Debt Instrument [Line Items]
Principal Outstanding	1,388.0		906.5
Debt Obligations Terms [Abstract]
Interest Rate Terms	variable
Information regarding variable interest rates paid [Abstract]
Variable Interest Rates Paid, Minimum (in hundredths)	0.35%
Variable Interest Rates Paid, Maximum (in hundredths)	0.78%
Weighted-Average Interest Rate Paid (in hundredths)	0.59%
Senior Debt Obligations [Member] | EPO Senior Notes I [Member]
Debt Instrument [Line Items]
Principal Outstanding	0		250.0
Debt Obligations Terms [Abstract]
Interest Rate Terms	fixed
Interest Rate, stated percentage (in hundredths)	5.00%
Maturity Date	Mar. 01, 2015
Senior Debt Obligations [Member] | EPO Senior Notes X [Member]
Debt Instrument [Line Items]
Principal Outstanding	400.0		400.0
Debt Obligations Terms [Abstract]
Interest Rate Terms	fixed
Interest Rate, stated percentage (in hundredths)	3.70%
Maturity Date	Jun. 01, 2015
Senior Debt Obligations [Member] | EPO Senior Notes FF [Member]
Debt Instrument [Line Items]
Principal Outstanding	650.0		650.0
Debt Obligations Terms [Abstract]
Interest Rate Terms	fixed
Interest Rate, stated percentage (in hundredths)	1.25%
Maturity Date	Aug. 13, 2015
Senior Debt Obligations [Member] | EPO $1.5 Billion 364-Day Credit Agreement [Member]
Debt Instrument [Line Items]
Principal Outstanding	0		0
Debt Obligations Terms [Abstract]
Interest Rate Terms	variable
Maturity Date	Sep. 29, 2015
Senior Debt Obligations [Member] | EPO Senior Notes AA [Member]
Debt Instrument [Line Items]
Principal Outstanding	750.0		750.0
Debt Obligations Terms [Abstract]
Interest Rate Terms	fixed
Interest Rate, stated percentage (in hundredths)	3.20%
Maturity Date	Feb. 01, 2016
Senior Debt Obligations [Member] | EPO Senior Notes L [Member]
Debt Instrument [Line Items]
Principal Outstanding	800.0		800.0
Debt Obligations Terms [Abstract]
Interest Rate Terms	fixed
Interest Rate, stated percentage (in hundredths)	6.30%
Maturity Date	Sep. 01, 2017
Senior Debt Obligations [Member] | EPO Senior Notes V [Member]
Debt Instrument [Line Items]
Principal Outstanding	349.7		349.7
Debt Obligations Terms [Abstract]
Interest Rate Terms	fixed
Interest Rate, stated percentage (in hundredths)	6.65%
Maturity Date	Apr. 15, 2018
Senior Debt Obligations [Member] | EPO $3.5 Billion Multi-Year Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Principal Outstanding	0		0
Debt Obligations Terms [Abstract]
Interest Rate Terms	variable
Maturity Date	Jun. 19, 2018
Information regarding variable interest rates paid [Abstract]
Variable Interest Rates Paid, Minimum (in hundredths)	1.15%
Variable Interest Rates Paid, Maximum (in hundredths)	3.25%
Weighted-Average Interest Rate Paid (in hundredths)	1.26%
Senior Debt Obligations [Member] | EPO Senior Notes N [Member]
Debt Instrument [Line Items]
Principal Outstanding	700.0		700.0
Debt Obligations Terms [Abstract]
Interest Rate Terms	fixed
Interest Rate, stated percentage (in hundredths)	6.50%
Maturity Date	Jan. 31, 2019
Senior Debt Obligations [Member] | EPO Senior Notes LL [Member]
Debt Instrument [Line Items]
Principal Outstanding	800.0		800.0
Debt Obligations Terms [Abstract]
Interest Rate Terms	fixed
Interest Rate, stated percentage (in hundredths)	2.55%
Maturity Date	Oct. 15, 2019
Senior Debt Obligations [Member] | EPO Senior Notes Q [Member]
Debt Instrument [Line Items]
Principal Outstanding	500.0		500.0
Debt Obligations Terms [Abstract]
Interest Rate Terms	fixed
Interest Rate, stated percentage (in hundredths)	5.25%
Maturity Date	Jan. 31, 2020
Senior Debt Obligations [Member] | EPO Senior Notes Y [Member]
Debt Instrument [Line Items]
Principal Outstanding	1,000.0		1,000.0
Debt Obligations Terms [Abstract]
Interest Rate Terms	fixed
Interest Rate, stated percentage (in hundredths)	5.20%
Maturity Date	Sep. 01, 2020
Senior Debt Obligations [Member] | EPO Senior Notes CC [Member]
Debt Instrument [Line Items]
Principal Outstanding	650.0		650.0
Debt Obligations Terms [Abstract]
Interest Rate Terms	fixed
Interest Rate, stated percentage (in hundredths)	4.05%
Maturity Date	Feb. 15, 2022
Senior Debt Obligations [Member] | EPO Senior Notes HH [Member]
Debt Instrument [Line Items]
Principal Outstanding	1,250.0		1,250.0
Debt Obligations Terms [Abstract]
Interest Rate Terms	fixed
Interest Rate, stated percentage (in hundredths)	3.35%
Maturity Date	Mar. 15, 2023
Senior Debt Obligations [Member] | EPO Senior Notes JJ [Member]
Debt Instrument [Line Items]
Principal Outstanding	850.0		850.0
Debt Obligations Terms [Abstract]
Interest Rate Terms	fixed
Interest Rate, stated percentage (in hundredths)	3.90%
Maturity Date	Feb. 15, 2024
Senior Debt Obligations [Member] | EPO Senior Notes MM [Member]
Debt Instrument [Line Items]
Principal Outstanding	1,150.0		1,150.0
Debt Obligations Terms [Abstract]
Interest Rate Terms	fixed
Interest Rate, stated percentage (in hundredths)	3.75%
Maturity Date	Feb. 15, 2025
Senior Debt Obligations [Member] | EPO Senior Notes D [Member]
Debt Instrument [Line Items]
Principal Outstanding	500.0		500.0
Debt Obligations Terms [Abstract]
Interest Rate Terms	fixed
Interest Rate, stated percentage (in hundredths)	6.875%
Maturity Date	Mar. 01, 2033
Senior Debt Obligations [Member] | EPO Senior Notes H [Member]
Debt Instrument [Line Items]
Principal Outstanding	350.0		350.0
Debt Obligations Terms [Abstract]
Interest Rate Terms	fixed
Interest Rate, stated percentage (in hundredths)	6.65%
Maturity Date	Oct. 15, 2034
Senior Debt Obligations [Member] | EPO Senior Notes J [Member]
Debt Instrument [Line Items]
Principal Outstanding	250.0		250.0
Debt Obligations Terms [Abstract]
Interest Rate Terms	fixed
Interest Rate, stated percentage (in hundredths)	5.75%
Maturity Date	Mar. 01, 2035
Senior Debt Obligations [Member] | EPO Senior Notes W [Member]
Debt Instrument [Line Items]
Principal Outstanding	399.6		399.6
Debt Obligations Terms [Abstract]
Interest Rate Terms	fixed
Interest Rate, stated percentage (in hundredths)	7.55%
Maturity Date	Apr. 15, 2038
Senior Debt Obligations [Member] | EPO Senior Notes R [Member]
Debt Instrument [Line Items]
Principal Outstanding	600.0		600.0
Debt Obligations Terms [Abstract]
Interest Rate Terms	fixed
Interest Rate, stated percentage (in hundredths)	6.125%
Maturity Date	Oct. 15, 2039
Senior Debt Obligations [Member] | EPO Senior Notes Z [Member]
Debt Instrument [Line Items]
Principal Outstanding	600.0		600.0
Debt Obligations Terms [Abstract]
Interest Rate Terms	fixed
Interest Rate, stated percentage (in hundredths)	6.45%
Maturity Date	Sep. 01, 2040
Senior Debt Obligations [Member] | EPO Senior Notes BB [Member]
Debt Instrument [Line Items]
Principal Outstanding	750.0		750.0
Debt Obligations Terms [Abstract]
Interest Rate Terms	fixed
Interest Rate, stated percentage (in hundredths)	5.95%
Maturity Date	Feb. 01, 2041
Senior Debt Obligations [Member] | EPO Senior Notes DD [Member]
Debt Instrument [Line Items]
Principal Outstanding	600.0		600.0
Debt Obligations Terms [Abstract]
Interest Rate Terms	fixed
Interest Rate, stated percentage (in hundredths)	5.70%
Maturity Date	Feb. 15, 2042
Senior Debt Obligations [Member] | EPO Senior Notes EE [Member]
Debt Instrument [Line Items]
Principal Outstanding	750.0		750.0
Debt Obligations Terms [Abstract]
Interest Rate Terms	fixed
Interest Rate, stated percentage (in hundredths)	4.85%
Maturity Date	Aug. 15, 2042
Senior Debt Obligations [Member] | EPO Senior Notes GG [Member]
Debt Instrument [Line Items]
Principal Outstanding	1,100.0		1,100.0
Debt Obligations Terms [Abstract]
Interest Rate Terms	fixed
Interest Rate, stated percentage (in hundredths)	4.45%
Maturity Date	Feb. 15, 2043
Senior Debt Obligations [Member] | EPO Senior Notes II [Member]
Debt Instrument [Line Items]
Principal Outstanding	1,400.0		1,400.0
Debt Obligations Terms [Abstract]
Interest Rate Terms	fixed
Interest Rate, stated percentage (in hundredths)	4.85%
Maturity Date	Mar. 15, 2044
Senior Debt Obligations [Member] | EPO Senior Notes KK [Member]
Debt Instrument [Line Items]
Principal Outstanding	1,150.0		1,150.0
Debt Obligations Terms [Abstract]
Interest Rate Terms	fixed
Interest Rate, stated percentage (in hundredths)	5.10%
Maturity Date	Feb. 15, 2045
Senior Debt Obligations [Member] | EPO Senior Notes NN [Member]
Debt Instrument [Line Items]
Principal Outstanding	400.0		400.0
Debt Obligations Terms [Abstract]
Interest Rate Terms	fixed
Interest Rate, stated percentage (in hundredths)	4.95%
Maturity Date	Oct. 15, 2054
Senior Debt Obligations [Member] | TEPPCO Senior Notes 4 [Member]
Debt Instrument [Line Items]
Principal Outstanding	0.3		0.3
Debt Obligations Terms [Abstract]
Interest Rate Terms	fixed
Interest Rate, stated percentage (in hundredths)	6.65%
Maturity Date	Apr. 15, 2018
Senior Debt Obligations [Member] | TEPPCO Senior Notes 5 [Member]
Debt Instrument [Line Items]
Principal Outstanding	0.4		0.4
Debt Obligations Terms [Abstract]
Interest Rate Terms	fixed
Interest Rate, stated percentage (in hundredths)	7.55%
Maturity Date	Apr. 15, 2038
Junior Debt Obligations [Member] | EPO Junior Subordinated Notes A [Member]
Debt Instrument [Line Items]
Principal Outstanding	550.0	[2]	550.0	[2]
Debt Obligations Terms [Abstract]
Interest Rate Terms	fixed/variable	[2]
Interest Rate, stated percentage (in hundredths)	8.375%	[2]
Maturity Date	Aug. 31, 2066	[2]
Date through which interest rate is fixed	8/1/2016
Variable annual interest rate thereafter, variable rate basis	3-month LIBOR
Variable interest rate (in hundredths)	3.7075%
Junior Debt Obligations [Member] | EPO Junior Subordinated Notes C [Member]
Debt Instrument [Line Items]
Principal Outstanding	285.8	[3]	285.8	[3]
Debt Obligations Terms [Abstract]
Interest Rate Terms	fixed/variable	[3]
Interest Rate, stated percentage (in hundredths)	7.00%	[3]
Maturity Date	Jun. 01, 2067	[3]
Date through which interest rate is fixed	9/1/2017
Variable annual interest rate thereafter, variable rate basis	3-month LIBOR
Variable interest rate (in hundredths)	2.7775%
Junior Debt Obligations [Member] | EPO Junior Subordinated Notes B [Member]
Debt Instrument [Line Items]
Principal Outstanding	682.7	[4]	682.7	[4]
Debt Obligations Terms [Abstract]
Interest Rate Terms	fixed/variable	[4]
Interest Rate, stated percentage (in hundredths)	7.034%	[4]
Maturity Date	Jan. 15, 2068	[4]
Date through which interest rate is fixed	1/15/2018
Variable annual interest rate thereafter, variable rate basis	3-month LIBOR
Variable interest rate (in hundredths)	2.68%
Minimum variable annual interest rate (in hundredths)	7.034%
Junior Debt Obligations [Member] | TEPPCO Junior Subordinated Notes [Member]
Debt Instrument [Line Items]
Principal Outstanding	$ 14.2		$ 14.2
Debt Obligations Terms [Abstract]
Interest Rate Terms	fixed/variable
Maturity Date	Jun. 01, 2067

[1] We expect to refinance the current maturities of our debt obligations at or prior to their maturity. Long-term and current maturities of debt reflect the classification of such obligations at March 31, 2015, after taking into consideration the long-term refinancing of Senior Notes X and Commercial Paper Notes using proceeds from our senior notes offering in May 2015 (see Note 17).

[2] Fixed rate of 8.375% through August 1, 2016; thereafter, variable rate based on 3-month LIBOR plus 3.7075%.

[3] Fixed rate of 7.0% through September 1, 2017; thereafter, variable rate based on 3-month LIBOR plus 2.7775%.

[4] Fixed rate of 7.034% through January 15, 2018; thereafter, the rate will be the greater of 7.034% or a variable rate based on 3-month LIBOR plus 2.68%.