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Equity and Distributions, Issuances of Equity (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 6 Months Ended 0 Months Ended 6 Months Ended 1 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Distribution Reinvestment Plan [Member]
Jun. 30, 2013
Distribution Reinvestment Plan [Member]
Aug. 07, 2014
Distribution Reinvestment Plan [Member]
EPCO and affiliates [Member]
Jun. 30, 2014
Distribution Reinvestment Plan [Member]
EPCO and affiliates [Member]
Jun. 30, 2014
Employee Unit Purchase Plan [Member]
Jun. 30, 2013
Employee Unit Purchase Plan [Member]
Jun. 30, 2014
2013 At-the-Market Registration [Member]
Jul. 31, 2014
2012 At-the-Market Registration [Member]
Jun. 30, 2013
2012 At-the-Market Registration [Member]
Registration Statements and Equity Offerings [Line Items]                      
Maximum common units authorized for issuance                 $ 1,250    
Maximum common units authorized for issuance (in units)     70,000,000       4,000,000        
Remaining units available for issuance                 1,190    
Remaining units available for issuance (in units)     16,035,439       3,638,914        
Net Cash Proceeds from Sale of Common Units [Abstract]                      
Number of common units issued (in units)     2,445,439 2,359,089   761,487 74,530 81,695 795,167   3,766,557
Gross proceeds from the sale of common units                 58.3   228.5
Net cash proceeds from the issuance of common units 223.3 835.4 160.4 129.8 25.0 50.0 5.2 4.8 57.7 226.5 214.2
Senior notes issued under universal shelf registration $ 2,000