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Equity and Distributions, Issuances of Equity (Details) (USD $) In Millions, except Share data, unless otherwise specified | 6 Months Ended |  | 6 Months Ended | 1 Months Ended | 6 Months Ended | 1 Months Ended | 6 Months Ended | 7 Months Ended
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Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 EPCO and affiliates [Member] | Jun. 30, 2013 Distribution Reinvestment Plan [Member] | Jun. 30, 2012 Distribution Reinvestment Plan [Member] | Aug. 31, 2013 Distribution Reinvestment Plan [Member] EPCO and affiliates [Member] | Jun. 30, 2013 Distribution Reinvestment Plan [Member] EPCO and affiliates [Member] | Jun. 30, 2013 Employee Unit Purchase Plan [Member] | Jun. 30, 2012 Employee Unit Purchase Plan [Member] | Mar. 31, 2013 Shelf Registration 2010 [Member] | Feb. 28, 2013 Shelf Registration 2010 [Member] | Jun. 30, 2013 2012 At-the-Market Registration [Member] | Jul. 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 |  |  |  |  |  |  |  |  |  |  |  | 566.1 |
Maximum common units authorized for issuance (in units) |  |  |  | 70,000,000 |  |  |  | 440,879 |  |  |  |  |
Remaining units available for issuance (in units) |  |  |  | 21,134,203 |  |  |  | 214,341 |  |  |  |  |
Net Cash Proceeds from Sale of Common Units [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of common units issued (in units) |  | 1,198,552 |  | 2,359,089 |  |  | 908,217 | 81,695 | 72,057 |  | 9,200,000 | 3,766,557 |
Over-allotment of common units included in offering (in units) |  |  |  |  |  |  |  |  |  |  | 1,200,000 |  |
Offering price of common unit (in dollars per share) |  |  |  |  |  |  |  |  |  |  | $ 54.56 |  |
Gross proceeds from the sale of common units |  |  |  |  |  |  |  |  |  |  |  | 228.5 |
Net cash proceeds from issuance of common units | 835.4 | 61.5 |  | 129.8 | 58.0 | 25.0 | 50.0 | 4.8 | 3.7 |  | 486.6 | 214.2 | 226.5
Senior notes issued under universal shelf registration |  |  |  |  |  |  |  |  |  | $ 2,250 |  |  |
Percentage of Total Units Outstanding (in hundredths) | 37.00% |  | 37.00% |  |  |  |  |  |  |  |  |  |

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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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