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Acquisition (Narrative) (Details) | Jul. 24, 2015 USD ($) platform | Jul. 23, 2015 USD ($) | Jul. 22, 2015 USD ($) shares | Jun. 30, 2016 USD ($) shares | Dec. 31, 2015 USD ($) shares
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Business Acquisition [Line Items] |  |  |  |  |
Common units, issued | shares |  |  | 10,350,000 | 109,979,218 | 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 |  |  |

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