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RELATED PARTY TRANSACTIONS (Details) (CAD)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
RELATED PARTY TRANSACTIONS      
Service charges 256us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty 222us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty 127us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
Purchase of natural gas by wholly owned subsidiaries 315enb_RelatedPartyTransactionNaturalGasPurchasesBySubsidiaries 99enb_RelatedPartyTransactionNaturalGasPurchasesBySubsidiaries 15enb_RelatedPartyTransactionNaturalGasPurchasesBySubsidiaries
Sale of natural gas by wholly owned subsidiaries 58enb_RelatedPartyTransactionSaleOfNaturalGasBySubsidiaries 10enb_RelatedPartyTransactionSaleOfNaturalGasBySubsidiaries 7enb_RelatedPartyTransactionSaleOfNaturalGasBySubsidiaries
Amounts receivable from affiliates 183us-gaap_DueFromAffiliateNoncurrent 185us-gaap_DueFromAffiliateNoncurrent  
Vector Pipeline joint venture      
RELATED PARTY TRANSACTIONS      
Service charges 7us-gaap_RevenueFromRelatedParties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= enb_VectorPipelineJointVentureMember
6us-gaap_RevenueFromRelatedParties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= enb_VectorPipelineJointVentureMember
6us-gaap_RevenueFromRelatedParties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= enb_VectorPipelineJointVentureMember
Amounts receivable from affiliates 183us-gaap_DueFromAffiliateNoncurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= enb_VectorPipelineJointVentureMember
181us-gaap_DueFromAffiliateNoncurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= enb_VectorPipelineJointVentureMember
 
Vector Pipeline joint venture | Minimum      
RELATED PARTY TRANSACTIONS      
Annual interest rate on the loans (as a percent) 4.00%enb_RelatedPartyTransactionInterestRateForLoansGivenToAffiliates
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= enb_VectorPipelineJointVentureMember
   
Vector Pipeline joint venture | Maximum      
RELATED PARTY TRANSACTIONS      
Annual interest rate on the loans (as a percent) 8.00%enb_RelatedPartyTransactionInterestRateForLoansGivenToAffiliates
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= enb_VectorPipelineJointVentureMember