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Equity and Distributions, Issuances of Equity (Details) (USD $) In Millions, except Share data, unless otherwise specified | 3 Months Ended |  | 3 Months Ended | 1 Months Ended | 3 Months Ended | 1 Months Ended | 3 Months Ended |  |
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Mar. 31, 2013 | Mar. 31, 2012 | Mar. 31, 2013 EPCO and affiliates [Member] | Mar. 31, 2013 Distribution Reinvestment Plan [Member] | Mar. 31, 2012 Distribution Reinvestment Plan [Member] | May 31, 2013 Distribution Reinvestment Plan [Member] EPCO and affiliates [Member] | Feb. 28, 2013 Distribution Reinvestment Plan [Member] EPCO and affiliates [Member] | Mar. 31, 2013 Employee Unit Purchase Plan [Member] | Mar. 31, 2012 Employee Unit Purchase Plan [Member] | Feb. 28, 2013 Shelf Registration 2010 [Member] | Mar. 31, 2013 Shelf Registration 2010 [Member] | May 08, 2013 2012 At-the-Market Registration [Member] | Mar. 31, 2013 2012 At-the-Market Registration [Member]
Registration Statements and Equity Offerings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum common units authorized for issuance |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,000
Remaining units available for issuance |  |  |  |  |  |  |  |  |  |  |  | 743.6 |
Maximum common units authorized for issuance (in units) |  |  |  | 70,000,000 |  |  |  | 440,879 |  |  |  |  |
Remaining units available for issuance (in units) |  |  |  | 22,249,932 |  |  |  | 264,167 |  |  |  |  |
Net Cash Proceeds from Sale of Common Units [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of common units issued (in units) |  |  |  | 1,243,360 | 667,095 |  | 473,188 | 31,869 | 24,841 | 9,200,000 |  |  |
Over-allotment of common units included in offering (in units) |  |  |  |  |  |  |  |  |  | 1,200,000 |  |  |
Offering price of common unit (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 54.56 |  |  |
Net cash proceeds from issuance of common units | 554.1 | 32.8 |  | 65.7 | 31.8 | 25.0 | 25.0 | 1.8 | 1.2 | 486.6 |  |  |
Senior notes issued under universal shelf registration |  |  |  |  |  |  |  |  |  |  | $ 2,250 |  |
Percentage of Total Units Outstanding (in hundredths) |  |  | 37.10% |  |  |  |  |  |  |  |  |  |

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- Definition The remaining number of limited partner units available for issuance, after taking into account limited partner units issued to date. The limited partners are partners of a publicly traded limited partnership or master limited partnership. Limited partners have limited liability and do not manage the partnership. + References No definition available. + Details
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- Definition The dollar value of the remaining amount of limited partner units available for issuance, after taking into account limited partner units issued to date. The limited partners are partners of a publicly traded limited partnership or master limited partnership. Limited partners have limited liability and do not manage the partnership. + References No definition available. + Details
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