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Subsequent Event (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Oct. 31, 2018 | Sep. 30, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Oct. 11, 2018
Property, Plant and Equipment Assets Held-for-sale Disclosure [Abstract] |  |  |  |  |
Proceeds from asset sales |  |  | $ 24,100 | $ 6,200 |
Red River System [Member] |  |  |  |  |
Property, Plant and Equipment Assets Held-for-sale Disclosure [Abstract] |  |  |  |  |
Proceeds from asset sales |  | $ 10,500 |  |  |
Assets held-for-sale |  | $ 109,600 | $ 109,600 |  |
Subsequent Event [Member] |  |  |  |  |
Debt Obligations [Abstract] |  |  |  |  |
Aggregate debt principal issued |  |  |  |  | $ 3,000,000
Subsequent Event [Member] | Red River System [Member] |  |  |  |  |
Property, Plant and Equipment Assets Held-for-sale Disclosure [Abstract] |  |  |  |  |
Proceeds from asset sales | $ 135,000 |  |  |  |
Subsequent Event [Member] | Senior Debt Obligations [Member] |  |  |  |  |
Debt Obligations [Abstract] |  |  |  |  |
Aggregate debt principal issued |  |  |  |  | 3,000,000
Subsequent Event [Member] | Senior Debt Obligations [Member] | EPO Senior Notes VV [Member] |  |  |  |  |
Debt Obligations [Abstract] |  |  |  |  |
Aggregate debt principal issued |  |  |  |  | $ 750,000
Maturity date | Feb. 01, 2022 |  |  |  |
Interest rate terms | fixed |  |  |  |
Interest rate, stated percentage |  |  |  |  | 3.50%
Debt issued as percent of principal amount | 99.985% |  |  |  |
Subsequent Event [Member] | Senior Debt Obligations [Member] | EPO Senior Notes WW [Member] |  |  |  |  |
Debt Obligations [Abstract] |  |  |  |  |
Aggregate debt principal issued |  |  |  |  | $ 1,000,000
Maturity date | Oct. 01, 2028 |  |  |  |
Interest rate terms | fixed |  |  |  |
Interest rate, stated percentage |  |  |  |  | 4.15%
Debt issued as percent of principal amount | 99.764% |  |  |  |
Subsequent Event [Member] | Senior Debt Obligations [Member] | EPO Senior Notes XX [Member] |  |  |  |  |
Debt Obligations [Abstract] |  |  |  |  |
Aggregate debt principal issued |  |  |  |  | $ 1,250,000
Maturity date | Feb. 01, 2049 |  |  |  |
Interest rate terms | fixed |  |  |  |
Interest rate, stated percentage |  |  |  |  | 4.80%
Debt issued as percent of principal amount | 99.39% |  |  |  |

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