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Debt Obligations (Details) (USD $) In Millions, unless otherwise specified | 1 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2013 | Jun. 30, 2013 | Dec. 31, 2012
Debt Instrument [Line Items] |  |  |  |  |
Principal Outstanding |  | $ 16,967.7 |  | $ 16,179.3 |
Other, non-principal amounts: |  |  |  |  |
Change in fair value of debt hedged in fair value hedging relationship |  | 29.3 | [1] | 39.3 | [1]
Unamortized discounts, net of premiums |  | (42.2) |  | (38.0) |
Other |  | 14.8 |  | 21.2 |
Total other, non-principal amounts |  | 1.9 |  | 22.5 |
Less current maturities of debt |  | (540.0) |  | (1,546.6) | [2]
Total long-term debt |  | 16,429.6 |  | 14,655.2 |
Debt Obligations Terms [Abstract] |  |  |  |  |
EPO Letter of credit related to commodity derivative instruments |  | 2.5 |  |  |
Total principal amount of senior debt obligations [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal Outstanding |  | 15,435.0 |  | 14,646.6 |
Senior Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal Outstanding |  | 15,350.0 |  |  |
Commercial Paper Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal Outstanding |  | 40.0 | [3] | 346.6 | [3]
Debt Obligations Terms [Abstract] |  |  |  |  |
Interest Rate Terms |  | fixed |  |  |
Interest Rate, stated percentage (in hundredths) |  | 0.29% |  |  |
Maturity Date |  | Jun. 19, 2018 |  |  |
EPO Senior Notes C [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal Outstanding |  | 0 |  | 350.0 |
Debt Obligations Terms [Abstract] |  |  |  |  |
Interest Rate Terms |  | fixed |  |  |
Interest Rate, stated percentage (in hundredths) |  | 6.375% |  |  |
Maturity Date |  | Feb. 01, 2013 |  |  |
EPO Senior Notes T [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal Outstanding |  | 0 |  | 182.5 |
Debt Obligations Terms [Abstract] |  |  |  |  |
Interest Rate Terms |  | fixed |  |  |
Interest Rate, stated percentage (in hundredths) |  | 6.125% |  |  |
Maturity Date |  | Feb. 01, 2013 |  |  |
EPO Senior Notes M [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal Outstanding |  | 0 |  | 400.0 |
Debt Obligations Terms [Abstract] |  |  |  |  |
Interest Rate Terms |  | fixed |  |  |
Interest Rate, stated percentage (in hundredths) |  | 5.65% |  |  |
Maturity Date |  | Apr. 01, 2013 |  |  |
EPO Senior Notes U [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal Outstanding |  | 0 |  | 237.6 |
Debt Obligations Terms [Abstract] |  |  |  |  |
Interest Rate Terms |  | fixed |  |  |
Interest Rate, stated percentage (in hundredths) |  | 5.90% |  |  |
Maturity Date |  | Apr. 15, 2013 |  |  |
EPO Senior Notes O [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) |  | 9.75% |  |  |
Maturity Date |  | Jan. 31, 2014 |  |  |
EPO Senior Notes G [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) |  | 5.60% |  |  |
Maturity Date |  | Oct. 15, 2014 |  |  |
EPO Senior Notes I [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) |  | 5.00% |  |  |
Maturity Date |  | Mar. 01, 2015 |  |  |
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 |  |  |
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 |  |  |
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 |  |  |
EPO $3.5 Billion Multi-Year Revolving Credit Facility [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal Outstanding |  | 45.0 |  | 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) |  | 1.17% |  |  |
Variable Interest Rates Paid, Maximum (in hundredths) |  | 1.51% |  |  |
Weighted-Average Interest Rate Paid (in hundredths) |  | 1.36% |  |  |
EPO 364 Day Credit Agreement [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal Outstanding |  | 0 |  | 0 |
Debt Obligations Terms [Abstract] |  |  |  |  |
Interest Rate Terms |  | variable |  |  |
Maturity Date |  | Jun. 18, 2014 |  |  |
Maximum borrowing capacity |  | 1,000 |  |  |
Number of extensions to maturity date which may be requested |  | 1 |  |  |
Length of extensions to maturity date (in years) |  | 1 year |  |  |
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 |  |  |
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 |  |  |
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 |  |  |
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 |  |  |
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 |  |  |
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 |  |  |
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 |  |  |
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 |  |  |
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 |  |  |
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 |  |  |
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 |  |  |
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 |  |  |
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 |  |  |
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 |  |  |
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 |  |  |
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 |  |  |
EPO Senior Notes HH [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal Outstanding |  | 1,250.0 |  | 0 |
Debt Obligations Terms [Abstract] |  |  |  |  |
Interest Rate Terms |  | fixed |  |  |
Interest Rate, stated percentage (in hundredths) |  | 3.35% |  |  |
Maturity Date |  | Mar. 15, 2023 |  |  |
Aggregate debt principal issued | 1,250 |  |  |  |
Maturity term (in years) |  | 10 |  |  |
Debt issued as percent of principal amount (in hundredths) | 99.908% |  |  |  |
EPO Senior Notes II [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal Outstanding |  | 1,000.0 |  | 0 |
Debt Obligations Terms [Abstract] |  |  |  |  |
Interest Rate Terms |  | fixed |  |  |
Interest Rate, stated percentage (in hundredths) |  | 4.85% |  |  |
Maturity Date |  | Mar. 15, 2044 |  |  |
Aggregate debt principal issued | 1,000 |  |  |  |
Maturity term (in years) |  | 31 |  |  |
Debt issued as percent of principal amount (in hundredths) | 99.619% |  |  |  |
TEPPCO Senior Notes 2 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal Outstanding |  | 0 |  | 17.5 |
Debt Obligations Terms [Abstract] |  |  |  |  |
Interest Rate Terms |  | fixed |  |  |
Interest Rate, stated percentage (in hundredths) |  | 6.125% |  |  |
Maturity Date |  | Feb. 01, 2013 |  |  |
TEPPCO Senior Notes 3 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal Outstanding |  | 0 |  | 12.4 |
Debt Obligations Terms [Abstract] |  |  |  |  |
Interest Rate Terms |  | fixed |  |  |
Interest Rate, stated percentage (in hundredths) |  | 5.90% |  |  |
Maturity Date |  | Apr. 15, 2013 |  |  |
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 |  |  |
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 |  |  |
EPO Junior Subordinated Notes A [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal Outstanding |  | 550.0 |  | 550.0 |
Debt Obligations Terms [Abstract] |  |  |  |  |
Interest Rate Terms |  | fixed/variable |  |  |
Maturity Date |  | Aug. 31, 2066 |  |  |
EPO Junior Subordinated Notes C [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal Outstanding |  | 285.8 |  | 285.8 |
Debt Obligations Terms [Abstract] |  |  |  |  |
Interest Rate Terms |  | fixed/variable |  |  |
Maturity Date |  | Jun. 01, 2067 |  |  |
EPO Junior Subordinated Notes B [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal Outstanding |  | 682.7 |  | 682.7 |
Debt Obligations Terms [Abstract] |  |  |  |  |
Interest Rate Terms |  | fixed/variable |  |  |
Maturity Date |  | Jan. 15, 2068 |  |  |
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] | See Note 4 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] | Principal amounts outstanding at June 30, 2013 have a fixed-rate of 0.29% and are due in July 2013.

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- Definition The amount outstanding on a letter of credit related to commodity derivative instruments. This letter of credit facility does not reduce the amount available for borrowing under EPO's Multi-Year Revolving Credit Facility. + References No definition available. + Details
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- Definition Description of the interest rate as being fixed or variable, and, if variable, identification of the index or rate on which the interest rate is based and the number of points or percentage added to that index or rate to set the rate, and other pertinent information, such as frequency of rate resets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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