RELATED PARTY TRANSACTIONS (Joint Funding Arrangement Discussions) (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2016	Mar. 31, 2015
Proceeds from noncontrolling interests	$ 54.4	$ 199.5
Eastern Access Pipeline [Member]
Noncontrolling Interest, Ownership Percentage by Parent	75.00%
Ownership interest in affiliate of Partnership (in percentage)	25.00%
Proceeds from noncontrolling interests	$ 7.2	36.8
Construction Project Work Force Cost Transactions [Member]
Related party expenses	$ 9.7	7.3
US Mainline Expansion [Member]
Noncontrolling Interest, Ownership Percentage by Parent	75.00%
Ownership interest in affiliate of Partnership (in percentage)	25.00%
Proceeds from noncontrolling interests	$ 42.8	$ 162.7

The percentage of ownership interest in affiliate of Partnership.

No definition available.

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- Definition

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

+ References

No definition available.

+ Details

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Financing Activities
-URI http://asc.fasb.org/extlink&oid=6513228

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3255-108585

+ Details

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

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- Details

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- Details

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- Details

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