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DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES (Details) (CAD) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012
Maximum
DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES
Floating rate debt as a percentage of total debt outstanding	25.00%
Foreign Exchange Risk
DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES
Period to hedge a minimum level of foreign currency denominated earnings exposures	5 years
Interest rate contracts - short-term borrowings
DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES
Average swap rate (as a percent)	2.20%
Interest rate contracts - long-term debt
DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES
Average swap rate (as a percent)	3.50%
Amount of future fixed rate term debt issuances	10,547
Equity Price Risk
DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES
Number of forms of stock-based compensation with equity price risk	1

X

- Definition

Represents the floating rate debt as a target percentage of the total debt outstanding.

+ References

No definition available.

+ Details

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Namespace Prefix:	enb_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Future period of time over which foreign currency denominated earnings exposures may be economically hedged.

+ References

No definition available.

+ Details

Name:	enb_FuturePeriodForeignCurrencyDenominatedEarningsHedging
Namespace Prefix:	enb_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents number of forms of stock-based compensation with equity price risk managed via equity derivatives.

+ References

No definition available.

+ Details

Name:	enb_NumberOfTypesOfEquityWithPriceRiskManagedViaEquityDerivatives
Namespace Prefix:	enb_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Average variable interest rate related to the group of interest rate derivatives.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeAverageVariableInterestRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_DerivativeLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Aggregate notional amount of interest rate derivatives, which relates to the currency amount specified in the interest rate derivative instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 1A

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5579245-113959



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Notional Amount

-URI http://asc.fasb.org/extlink&oid=6519104



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 1B

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5580258-113959

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant