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Equity and Distributions, Issuances of Equity (Details) - USD ($)
$ in Thousands
 1 Months Ended 3 Months Ended 9 Months Ended
Oct. 31, 2018
Sep. 30, 2018
Mar. 31, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Net Cash Proceeds from Sale of Common Units [Abstract]            
Net cash proceeds from the issuance of common units         $ 449,400 $ 877,200
Common units issued in connection with employee compensation (in units)     1,443,586      
Common units issued in connection with employee compensation   $ 0   $ 0 $ 39,100 $ 33,700
Long-Term Incentive Plan (2008) [Member]            
Net Cash Proceeds from Sale of Common Units [Abstract]            
Common units issued in connection with employee compensation (in units)         1,443,586  
Common units issued in connection with employee compensation         $ 39,100  
Universal Shelf Registration [Member]            
Registration Statements and Equity Offerings [Line Items]            
Debt issued under universal shelf registration         2,700,000  
Universal Shelf Registration [Member] | Subsequent Event [Member]            
Registration Statements and Equity Offerings [Line Items]            
Debt issued under universal shelf registration $ 3,000,000          
At-the-Market Registration [Member]            
Registration Statements and Equity Offerings [Line Items]            
Maximum common units authorized for issuance   2,540,000     2,540,000  
Remaining units available for issuance   $ 2,540,000     $ 2,540,000  
Net Cash Proceeds from Sale of Common Units [Abstract]            
Number of common units issued (in units)           21,807,726
Gross proceeds from the sale of common units           $ 603,100
Net cash proceeds from the issuance of common units           $ 597,300
Distribution Reinvestment Plan [Member]            
Registration Statements and Equity Offerings [Line Items]            
Remaining units available for issuance (in units)   64,643,166     64,643,166  
Net Cash Proceeds from Sale of Common Units [Abstract]            
Number of common units issued (in units)         16,073,974 10,345,655
Net cash proceeds from the issuance of common units         $ 438,100 $ 269,900
Distribution Reinvestment Plan [Member] | EPCO and its privately held affiliates [Member]            
Net Cash Proceeds from Sale of Common Units [Abstract]            
Gross proceeds from the sale of common units         206,000  
Net cash proceeds from the issuance of common units         $ 206,000  
Employee Unit Purchase Plan [Member]            
Registration Statements and Equity Offerings [Line Items]            
Remaining units available for issuance (in units)   5,357,209     5,357,209  
Net Cash Proceeds from Sale of Common Units [Abstract]            
Number of common units issued (in units)         403,602 364,934
Net cash proceeds from the issuance of common units         $ 11,300 $ 10,000