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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%

X

- Definition

Amount of assets held-for-sale that are not part of a disposal group, expected to be sold within a year or the normal operating cycle, if longer.

+ References

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Face (par) amount of debt instrument at time of issuance.

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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