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RISK MANAGEMENT AND FINANCIAL INSTRUMENTS (Details 8) (CAD) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Changes in net fair value of derivative assets and liabilities classified as Level 3 in the fair value hierarchy
Level 3 net derivative liability at beginning of period	(164)enb_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetAndLiabilityNetValue	(24)enb_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetAndLiabilityNetValue
Total gains/(loss)
Included in earnings	252enb_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetAndLiabilityGainLossIncludedInEarnings	(100)enb_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetAndLiabilityGainLossIncludedInEarnings
Included in OCI	32us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisGainLossIncludedInOtherComprehensiveIncomeLoss
Settlements	29enb_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetAndLiabilitySettlements	(40)enb_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetAndLiabilitySettlements
Level 3 net derivative liability at end of period	149enb_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetAndLiabilityNetValue	(164)enb_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetAndLiabilityNetValue
Amount of transfer of fair value of liabilities between level	0enb_FairValueLiabilitiesInterLevelTransfersAmount	0enb_FairValueLiabilitiesInterLevelTransfersAmount
Amount of transfer of fair value of assets between level	0enb_FairValueAssetsInterLevelTransfersAmount	0enb_FairValueAssetsInterLevelTransfersAmount
Net Investment Hedges unrealized translation loss on foreign exchange contracts	199us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax	46us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax
Net Investment Hedges unrealized loss on change in fair value on foreign exchange contracts	114us-gaap_UnrealizedLossOnForeignCurrencyDerivativesBeforeTax	80us-gaap_UnrealizedLossOnForeignCurrencyDerivativesBeforeTax
Net Investment Hedges realized gains on settlement on forward exchange contracts	10us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationBeforeTax	15us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationBeforeTax
Net Investment Hedges amount of ineffectiveness	0us-gaap_AmountOfIneffectivenessOnNetInvestmentHedges	0us-gaap_AmountOfIneffectivenessOnNetInvestmentHedges
Fair Value of Other Financial Instruments
Equity investments at carrying value	99us-gaap_CostMethodInvestments	103us-gaap_CostMethodInvestments
Preference shares (Note 20) | Minimum
Fair Value of Other Financial Instruments
Cumulative dividends based on average yield of Government of Canada bonds, maturity period of bonds	10 years
Cumulative dividends based on average yield of Government of Canada bonds, spread over reference rate (as a percent)	4.30%enb_CumulativeDividendsSpreadOverVariableReferenceRate / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_PreferredStockMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Preference shares (Note 20) | Maximum
Fair Value of Other Financial Instruments
Cumulative dividends based on average yield of Government of Canada bonds, spread over reference rate (as a percent)	4.40%enb_CumulativeDividendsSpreadOverVariableReferenceRate / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_PreferredStockMember / us-gaap_RangeAxis = us-gaap_MaximumMember
Carrying value
Fair Value of Other Financial Instruments
Long-term debt	34,427us-gaap_LongTermDebtFairValue / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember	25,168us-gaap_LongTermDebtFairValue / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember
Carrying value | Preference shares (Note 20)
Fair Value of Other Financial Instruments
Held to maturity preferred share investment	323us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_PreferredStockMember	287us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_PreferredStockMember
Total Gross Derivative Instruments
Fair Value of Other Financial Instruments
Long-term debt	36,637us-gaap_LongTermDebtFairValue / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember	27,469us-gaap_LongTermDebtFairValue / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember
Total Gross Derivative Instruments | Preference shares (Note 20)
Fair Value of Other Financial Instruments
Held to maturity preferred share investment	580us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_PreferredStockMember	580us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_PreferredStockMember

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Gain (loss) on hedging derivative instrument or the foreign currency transaction gain (loss) on the nonderivative hedging instrument designated as a hedge of a net investment in foreign operations related to hedge ineffectiveness, which is included in earnings in the period.

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Amount, after adjustment, of cost-method investment. Adjustments include, but are not limited to, dividends received in excess of earnings after date of investment that are considered a return of investment and other than temporary impairments.

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Amount of gain (loss) recognized in other comprehensive income, arising from assets, liabilities and financial instruments classified in shareholders' equity measured at fair value on a recurring basis using unobservable inputs (level 3).

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Fair value of investments in debt securities classified as held-to-maturity.

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The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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Amount before tax, after reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

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Amount before tax of reclassification adjustment from accumulated other comprehensive income for translation gain (loss) realized upon the sale or liquidation of an investment in a foreign entity and foreign currency hedges that are designated and qualified as hedging instruments for hedges of the foreign currency exposure of a net investment in a foreign operation.

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Amount of unrealized loss recorded in accumulated other comprehensive income pertaining to the decrease in fair value of foreign currency exchange rate derivatives designated as cash flow hedging instruments to the extent that a cash flow hedge is determined to be effective.

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