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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
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%