Represents the capacity in megawatts of the wind project acquired.

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- Definition

Capitalized amounts representing the entity's portion of development costs of the investee.

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No definition available.

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- Definition

Represents the percentage points added to the variable reference rate for the calculation of cumulative dividends.

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No definition available.

+ Details

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- Definition

The distance off shore of the wind project.

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No definition available.

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- Definition

This element represents the estimated aggregate cost of the final total investment accounted for under the equity method of accounting.

+ References

No definition available.

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- Definition

Represents the number of the entity's shares purchased by equity investee through secondary offering, during the period.

+ References

No definition available.

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Represents the number of the entity's shares sold by equity investee through secondary offering, during the period.

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No definition available.

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- Definition

Represents the ownership interest of equity investee in the entity.

+ References

No definition available.

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- Definition

The percentage of another investor's ownership of common stock or equity participation in the investee accounted for by the reporting entity under the equity method of accounting.

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No definition available.

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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 that was sold.

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No definition available.

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- Definition

Represents the indirect pro-rata interest of the entity in its own shares.

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No definition available.

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- Definition

The number of licenses for large scale wind farms.

+ References

No definition available.

+ Details

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- Definition

The total number of investors in the project.

+ References

No definition available.

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- Definition

The period that the power purchase agreement lasts.

+ References

No definition available.

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Data Type:	us-types:durationStringItemType
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- Definition

Represents the maturity period of the Government of Canada bond.

+ References

No definition available.

+ Details

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- Definition

Represents the reduction in equity investment and shareholder's equity due to reciprocal investment.

+ References

No definition available.

+ Details

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Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 45
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- Definition

This element represents the aggregate cost of investments accounted for under the equity method of accounting.

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

This item represents an other than temporary decline in value that has been recognized against an investment accounted for under the equity method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value subject to the equity accounting method. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-Topic 323
-SubTopic 10
-Section 35
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- Definition

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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
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- Definition

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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No definition available.

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LONG-TERM INVESTMENTS - ADDITIONAL DISCLOSURES (Details) € in Millions, £ in Millions, shares in Millions, CAD in Millions	1 Months Ended		12 Months Ended
	Feb. 29, 2016 shares	Nov. 30, 2015 item	Dec. 31, 2016 GBP (£)	Dec. 31, 2016 GBP (£) mi	Dec. 31, 2016 GBP (£) km	Dec. 31, 2016 GBP (£) MW	Dec. 31, 2016 CAD	Dec. 31, 2015 CAD	Dec. 31, 2014 CAD shares	Dec. 31, 2016 EUR (€)	Dec. 31, 2016 CAD	May 19, 2016 item	Nov. 04, 2015	Jul. 01, 2014
LONG-TERM INVESTMENTS
Asset impairment charges							CAD 1,620	CAD 536	CAD 18
Preference shares
LONG-TERM INVESTMENTS
Cumulative dividends based on average yield of Government of Canada bonds, spread over reference rate (as a percent)			4.38%	4.38%	4.38%	4.38%				4.38%	4.38%
Eddystone Rail Company, LLC \| Liquids Pipelines
LONG-TERM INVESTMENTS
Investment impairment							184
Ownership interest (as a percent)			75.00%	75.00%	75.00%	75.00%				75.00%	75.00%
Aux Sable
LONG-TERM INVESTMENTS
Asset impairment charges							37
Eolien Maritime France SAS
LONG-TERM INVESTMENTS
Ownership interest (as a percent)												50.00%
Number of licenses for large-scale wind farms \| item												3
Enbridge's portion of development costs incurred to date										€ 136	CAD 194
Eolien Maritime France SAS \| Long Term Investment
LONG-TERM INVESTMENTS
Enbridge's portion of development costs incurred to date											58
Eolien Maritime France SAS \| Deferred Amounts And Other Assets
LONG-TERM INVESTMENTS
Enbridge's portion of development costs incurred to date											136
Rampion Offshore Wind Project
LONG-TERM INVESTMENTS
Ownership interest (as a percent)		24.90%											24.90%
Wind project capacity \| MW						400
Distance off the shore from the UK Sussex coast				8	13
Estimated total amount of investment			£ 370.0	£ 370.0	£ 370.0	£ 370.0					750
Power purchase agreement period			15 years
Total number of investors \| item		3
Amount of investment to date			£ 195.0	£ 195.0	£ 195.0	£ 195.0					CAD 345
Rampion Offshore Wind Project \| UK Green Investment Bank plc
LONG-TERM INVESTMENTS
Ownership interest of other investor (as a percent)		25.00%
Rampion Offshore Wind Project \| E.ON Climate And Renewables UK Limited
LONG-TERM INVESTMENTS
Ownership interest of other investor (as a percent)		50.10%
Southern Access Extension Project \| Liquids Pipelines
LONG-TERM INVESTMENTS
Ownership percentage sold														35.00%
Ownership interest (as a percent)			65.00%	65.00%	65.00%	65.00%				65.00%	65.00%			65.00%
Noverco \| Common shares
LONG-TERM INVESTMENTS
Ownership interest (as a percent)			38.90%	38.90%	38.90%	38.90%		38.90%		38.90%	38.90%
Reciprocal ownership interest held by investee (as a percent)			3.40%	3.40%	3.40%	3.40%		3.60%	3.60%	3.40%	3.40%
Number of reciprocal shares purchased through secondary offering \| shares	1.2
Number of reciprocal shares sold through secondary offering \| shares									1.3
Indirect pro-rata interest of the entity in the shares of the entity (as a percent)			1.30%	1.30%	1.30%	1.30%		1.40%	1.40%	1.30%	1.30%
Amount reduced from equity investment and shareholder's equity by the reciprocal shareholding							CAD 102	CAD 83	CAD 83
Noverco \| Preference shares
LONG-TERM INVESTMENTS
Cumulative dividends per share calculation, maturity period of Government of Canada bond			10 years
Cumulative dividends based on average yield of Government of Canada bonds, spread over reference rate (as a percent)			4.38%	4.38%	4.38%	4.38%				4.38%	4.38%