The number of subsidiaries over which the entity have control.

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The amount of pipeline measured in miles related to either a natural gas or crude oil pipeline system.

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Total daily amount of product committed to be supplied under existing contracts or agreements.

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The percentage of ownership interest in affiliate of Partnership.

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Percentage of voting equity interests acquired at the acquisition date in the business combination.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

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-Section 50

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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-Name Accounting Standards Codification

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This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

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Total investments in (A) an entity in which the entity has significant influence, but does not have control, (B) subsidiaries that are not required to be consolidated and are accounted for using the equity and or cost method, and (C) an entity in which the reporting entity shares control of the entity with another party or group. Includes long-term advances receivable from a party that is affiliated with the reporting entity by means of direct or indirect ownership.

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Date the credit facility terminates, in CCYY-MM-DD format.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

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Amount of cash inflow from a noncontrolling interest. Includes, but is not limited to, purchase of additional shares or other increase in noncontrolling interest ownership.

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Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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RELATED PARTY TRANSACTIONS (Joint Funding Arrangement Discussions) (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015 USD ($) entities mi bbl	Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($) entities mi bbl	Jun. 30, 2014 USD ($)	Jan. 02, 2015	Dec. 31, 2014 USD ($)
General Partners' equity contributions			$ 502.6	$ 612.9
Schedule of Equity Method Investments [Line Items]
Equity loss from investment in joint venture			11.6	1.0
EUS 364-day Credit Facility [Member]
Credit agreements, maximum borrowing capacity	$ 750.0		$ 750.0
Credit facility, expiration date			Mar. 07, 2016
Facility term			364 days
Texas Express NGL System [Member]
Schedule of Equity Method Investments [Line Items]
Ownership interest in joint venture (in percentage)	35.00%		35.00%
Number of joint ventures (in entities) \| entities	2		2
Equity Investment in Joint Venture	$ 376.2		$ 376.2			$ 380.6
Equity loss from investment in joint venture	$ 5.9	$ 2.3	$ 11.6	1.0
Length of pipeline (in miles) \| mi	593		593
Transportation commitments (in Bpd) \| bbl	27,000		27,000
Texas Express NGL System [Member] \| Maximum [Member]
Schedule of Equity Method Investments [Line Items]
Transportation commitments (in Bpd) \| bbl	120,000		120,000
Alberta Clipper Pipeline [Member]
Percentage of interest acquired (in percentage)					66.70%
Pipeline Transportation and Demand Fees from Texas Express NGL System [Member]
Related party expenses	$ 4.6	$ 6.1	$ 8.3	11.4
Eastern Access Interests [Member]
General Partners' equity contributions			$ 98.3	360.8
Ownership interest in affiliate of Partnership (in percentage)			25.00%
Noncontrolling interest, ownership by parent (in percentage)	75.00%		75.00%
US Mainline Expansion [Member]
General Partners' equity contributions			$ 360.7	$ 177.7
Ownership interest in affiliate of Partnership (in percentage)			25.00%
Noncontrolling interest, ownership by parent (in percentage)	75.00%		75.00%