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FINANCIAL STATEMENT EFFECTS OF RATE REGULATION (Details 2) (CAD)
In Millions, unless otherwise specified
12 Months Ended 1 Months Ended
Dec. 31, 2014
Dec. 31, 2013
May 31, 2014
FINANCIAL STATEMENT EFFECTS      
Regulatory assets 0us-gaap_RegulatoryAssets    
EGD shares      
FINANCIAL STATEMENT EFFECTS      
Cumulative costs relating to consulting contract capitalized 166enb_PropertyPlantAndEquipmentCostCapitalized
/ dei_LegalEntityAxis
= enb_EnbridgeGasDistributionIncMember
154enb_PropertyPlantAndEquipmentCostCapitalized
/ dei_LegalEntityAxis
= enb_EnbridgeGasDistributionIncMember
 
Average service life 25 years    
Other Postretirement Plans | EGD shares      
FINANCIAL STATEMENT EFFECTS      
Amount of OPEB balance expected to be collected   89enb_DefinedBenefitPlanCostsPermittedToBeRecovered
/ dei_LegalEntityAxis
= enb_EnbridgeGasDistributionIncMember
/ enb_RegulatedBusinessOperationsAxis
= us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember
 
Term for collection of OPEB balance commencing from 2013   20 years  
Liquids Pipelines | Deferred income taxes      
FINANCIAL STATEMENT EFFECTS      
Regulatory assets 907us-gaap_RegulatoryAssets
/ enb_RegulatedBusinessOperationsAxis
= us-gaap_DeferredIncomeTaxChargesMember
/ us-gaap_StatementBusinessSegmentsAxis
= enb_LiquidsPipelinesMember
727us-gaap_RegulatoryAssets
/ enb_RegulatedBusinessOperationsAxis
= us-gaap_DeferredIncomeTaxChargesMember
/ us-gaap_StatementBusinessSegmentsAxis
= enb_LiquidsPipelinesMember
 
Liquids Pipelines | Tolling deferrals      
FINANCIAL STATEMENT EFFECTS      
Regulatory Liabilities (39)us-gaap_RegulatoryLiabilities
/ enb_RegulatedBusinessOperationsAxis
= enb_TollingDeferralsMember
/ us-gaap_StatementBusinessSegmentsAxis
= enb_LiquidsPipelinesMember
(36)us-gaap_RegulatoryLiabilities
/ enb_RegulatedBusinessOperationsAxis
= enb_TollingDeferralsMember
/ us-gaap_StatementBusinessSegmentsAxis
= enb_LiquidsPipelinesMember
 
Accumulate period 8 years    
Liquids Pipelines | Recoverable income taxes      
FINANCIAL STATEMENT EFFECTS      
Regulatory assets 46us-gaap_RegulatoryAssets
/ enb_RegulatedBusinessOperationsAxis
= enb_RecoverableIncomeTaxesMember
/ us-gaap_StatementBusinessSegmentsAxis
= enb_LiquidsPipelinesMember
42us-gaap_RegulatoryAssets
/ enb_RegulatedBusinessOperationsAxis
= enb_RecoverableIncomeTaxesMember
/ us-gaap_StatementBusinessSegmentsAxis
= enb_LiquidsPipelinesMember
 
Recovery period 30 years    
Gas Distribution | Deferred income taxes      
FINANCIAL STATEMENT EFFECTS      
Regulatory assets 275us-gaap_RegulatoryAssets
/ enb_RegulatedBusinessOperationsAxis
= us-gaap_DeferredIncomeTaxChargesMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_GasDistributionMember
214us-gaap_RegulatoryAssets
/ enb_RegulatedBusinessOperationsAxis
= us-gaap_DeferredIncomeTaxChargesMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_GasDistributionMember
 
Gas Distribution | Purchased gas variance      
FINANCIAL STATEMENT EFFECTS      
Regulatory assets 673us-gaap_RegulatoryAssets
/ enb_RegulatedBusinessOperationsAxis
= enb_PurchasedGasVarianceMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_GasDistributionMember
   
Rolling period 12 months    
Additional rolling period     24 months
Gas Distribution | Transaction services deferral      
FINANCIAL STATEMENT EFFECTS      
Regulatory Liabilities (26)us-gaap_RegulatoryLiabilities
/ enb_RegulatedBusinessOperationsAxis
= enb_TransactionServicesDeferralMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_GasDistributionMember
(51)us-gaap_RegulatoryLiabilities
/ enb_RegulatedBusinessOperationsAxis
= enb_TransactionServicesDeferralMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_GasDistributionMember
 
Gas Distribution | Future removal and site restoration reserves      
FINANCIAL STATEMENT EFFECTS      
Regulatory Liabilities (562)us-gaap_RegulatoryLiabilities
/ enb_RegulatedBusinessOperationsAxis
= enb_FutureRemovalAndSiteRestorationReservesMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_GasDistributionMember
(929)us-gaap_RegulatoryLiabilities
/ enb_RegulatedBusinessOperationsAxis
= enb_FutureRemovalAndSiteRestorationReservesMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_GasDistributionMember
 
Gas Distribution | Pension plans and OPEB      
FINANCIAL STATEMENT EFFECTS      
Regulatory assets 171us-gaap_RegulatoryAssets
/ enb_RegulatedBusinessOperationsAxis
= enb_PensionCostsAndOtherPostretirementBenefitPlansDefinedBenefitCostsMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_GasDistributionMember
94us-gaap_RegulatoryAssets
/ enb_RegulatedBusinessOperationsAxis
= enb_PensionCostsAndOtherPostretirementBenefitPlansDefinedBenefitCostsMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_GasDistributionMember
 
Gas Distribution | Constant dollar net salvage adjustment      
FINANCIAL STATEMENT EFFECTS      
Regulatory assets 37us-gaap_RegulatoryAssets
/ enb_RegulatedBusinessOperationsAxis
= enb_ConstantDollarNetSalvageAdjustmentMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_GasDistributionMember
   
Gas Distribution | Site restoration      
FINANCIAL STATEMENT EFFECTS      
Regulatory Liabilities (283)us-gaap_RegulatoryLiabilities
/ enb_RegulatedBusinessOperationsAxis
= enb_SiteRestorationMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_GasDistributionMember
   
Gas Distribution | Revenue adjustment member      
FINANCIAL STATEMENT EFFECTS      
Regulatory Liabilities (52)us-gaap_RegulatoryLiabilities
/ enb_RegulatedBusinessOperationsAxis
= enb_RevenueAdjustmentMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_GasDistributionMember
   
Sponsored Investments | Deferred income taxes      
FINANCIAL STATEMENT EFFECTS      
Regulatory assets 15us-gaap_RegulatoryAssets
/ enb_RegulatedBusinessOperationsAxis
= us-gaap_DeferredIncomeTaxChargesMember
/ us-gaap_StatementBusinessSegmentsAxis
= enb_SponsoredInvestmentsMember
28us-gaap_RegulatoryAssets
/ enb_RegulatedBusinessOperationsAxis
= us-gaap_DeferredIncomeTaxChargesMember
/ us-gaap_StatementBusinessSegmentsAxis
= enb_SponsoredInvestmentsMember
 
Sponsored Investments | Transportation revenue adjustments      
FINANCIAL STATEMENT EFFECTS      
Regulatory assets 36us-gaap_RegulatoryAssets
/ enb_RegulatedBusinessOperationsAxis
= enb_TransportationRevenueAdjustmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= enb_SponsoredInvestmentsMember
33us-gaap_RegulatoryAssets
/ enb_RegulatedBusinessOperationsAxis
= enb_TransportationRevenueAdjustmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= enb_SponsoredInvestmentsMember
 
Recovery period 5 years