The amount of geographical area, in miles, covered by a crude oil or natural gas pipeline system.

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- Definition

The amount of crude oil that can be stored within storage tanks or transported through crude oil pipeline systems; measured in barrels.

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No definition available.

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- Definition

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

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No definition available.

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- Definition

The number of plants available for processing natural gas and natural gas liquids associated with a natural gas pipeline system.

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No definition available.

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The number of standby plants available for processing natural gas and natural gas liquids associated with a natural gas pipeline system.

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No definition available.

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- Definition

The number of plants available for treating natural gas and natural gas liquids associated with a natural gas pipeline system.

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No definition available.

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The number of standby plants available for treating natural gas and natural gas liquids associated with a natural gas pipeline system.

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No definition available.

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- Definition

The number of pump stations in the system.

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No definition available.

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- Definition

The percentage of ownership interest in affiliate of Partnership.

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No definition available.

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The period of operation of the business.

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No definition available.

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- Definition

Subsidiary Or Equity Method Investee Ownership Interest Sold.

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No definition available.

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- Definition

Transaction value of acquisition

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No definition available.

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- Definition

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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- Definition

Price of a single share of a number of saleable stocks paid or offered to be paid in a business combination.

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No definition available.

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- Definition

The number of units or percentage investment held by one or more members or limited partners of the LLC or LP.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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- Definition

Amount of increase in noncontrolling interest from sale of a portion of the parent's controlling interest.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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- Definition

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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No definition available.

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- Definition

The cash inflow associated with the deconsolidation of a previously consolidated subsidiary or sale of an entity that is related to it but not strictly controlled.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Investing Activities
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ORGANIZATION AND NATURE OF OPERATIONS (Details) $ / shares in Units, bbl in Millions, $ in Millions	1 Months Ended		12 Months Ended
	Jan. 26, 2017 USD ($) $ / shares	Jul. 31, 2014 USD ($)	Dec. 31, 2016 bbl	Dec. 31, 2015
Master limited partnership ownership interest (in percentage)			100.00%	100.00%
Transfer of interests in subsidiary to Midcoast Energy Partners, L.P.		$ 125.4
Number of reporting segments (in segments)			2
Natural gas treating plants (in plants)			4
Natural gas treating plants, standby (in plants)			6
Natural gas processing plants (in plants)			15
Natural gas processing plants, standby (in plants)			10
Natural Gas Reserves [Member]
Length of pipeline (in miles)			10,800
NGL [Member]
Length of pipeline (in miles)			282
General Partner [Member]
Master limited partnership ownership interest (in percentage)			41.70%	42.20%
Lakehead System [Member]
Length of pipeline (in miles)			5,022
Covered area of pipeline (in miles)			2,211
Number of pump stations (in stations)			75
Period of operation			60 years
Mid Continent System [Member]
Length of pipeline (in miles)			433
Crude oil capacity (in barrels) \| bbl			25.1
North Dakota System [Member]
Length of pipeline (in miles)			660
Crude oil capacity (in barrels) \| bbl			1.8
Number of pump stations (in stations)			20
Enbridge Inc. [Member]
Ownership interest in affiliate of Partnership (in percentage)			41.70%	42.20%
Enbridge Inc. [Member] \| Subsequent Event [Member]
Per share price of acquisition (in dollars per share) \| $ / shares	$ 8
Transaction Value of Acquisition	$ 170.2
Percent interest acquired by General Partner (in percentage)	25.00%
Midcoast Energy Partners [Member]
Ownership interest in affiliate of Partnership (in percentage)			53.90%
Midcoast Energy Partners [Member] \| Subordinated Units [Member]
Master limited partnership ownership interest (in percentage)			100.00%
Midcoast Energy Partners [Member] \| Class A Common Units [Member]
Ownership interest in affiliate of Partnership (in percentage)			2.90%
Midcoast Energy Partners [Member] \| General Partner [Member]
Master limited partnership ownership interest (in percentage)			100.00%
Midcoast Operating [Member]
Master limited partnership ownership interest (in percentage)		61.00%	48.40%
Ownership interest sold (in percentage)		12.60%
Cash received		$ 350.0