Acquisition (Narrative) (Details)	Jul. 24, 2015 USD ($) platform	Jul. 23, 2015 USD ($)	Jul. 22, 2015 USD ($) shares	Sep. 30, 2016 USD ($) shares	Dec. 31, 2015 USD ($) shares
Business Acquisition [Line Items]
Common units, issued | shares			10,350,000	117,979,218	109,979,218
Public sale of units net of offering costs			$ 437,200,000
Enterprise Offshore Acquisition
Business Acquisition [Line Items]
Effective date of acquisition	Jul. 24, 2015
Business Acquisition, Transaction Costs	$ 1,500,000,000
Number of Hubs | platform	6
Cameron Highway Oil Pipeline Company [Member] | Enterprise Offshore Acquisition
Business Acquisition [Line Items]
Business Combination, Step Acquisition, Equity Interest in Acquiree, Including Subsequent Acquisition, Percentage	50.00%
Poseidon Oil Pipeline Company | Enterprise Offshore Acquisition
Business Acquisition [Line Items]
Business Combination, Step Acquisition, Equity Interest in Acquiree, Including Subsequent Acquisition, Percentage	36.00%
Sekco [Member] | Enterprise Offshore Acquisition
Business Acquisition [Line Items]
Business Combination, Step Acquisition, Equity Interest in Acquiree, Including Subsequent Acquisition, Percentage	50.00%
6.75% Senior Unsecured Notes [Member]
Business Acquisition [Line Items]
Debt Instrument, Face Amount				$ 750,000,000	$ 750,000,000
Debt Instrument, Interest Rate, Stated Percentage				6.75%	6.75%
Proceeds from Debt, Net of Issuance Costs		$ 728,600,000