DEBT - COMMITTED CREDIT FACILITIES (Details) - Committed credit facilities - CAD CAD in Millions	Dec. 31, 2016	Dec. 31, 2015
CREDIT FACILITIES
Total Facilities	CAD 22,091	CAD 21,720
Draws	9,311
Available	12,780
Enbridge Inc.
CREDIT FACILITIES
Total Facilities	8,183	6,988
Draws	4,700
Available	3,483
Enbridge (U.S.) Inc.
CREDIT FACILITIES
Total Facilities	3,934	4,470
Draws	126
Available	3,808
Enbridge Energy Partners, L.P.
CREDIT FACILITIES
Total Facilities	3,525	3,598
Draws	2,293
Available	1,232
Enbridge Gas Distribution Inc.
CREDIT FACILITIES
Total Facilities	1,017	1,010
Draws	360
Available	657
The Fund
CREDIT FACILITIES
Total Facilities	1,500	1,500
Draws	236
Available	1,264
Enbridge Pipelines (Southern Lights) L.L.C.
CREDIT FACILITIES
Total Facilities	27	28
Available	27
Enbridge Pipelines Inc.
CREDIT FACILITIES
Total Facilities	3,000	3,000
Draws	1,032
Available	1,968
Enbridge Southern Lights LP
CREDIT FACILITIES
Total Facilities	5	5
Available	5
Midcoast Energy Partners, L.P.
CREDIT FACILITIES
Total Facilities	900	CAD 1,121
Draws	564
Available	CAD 336

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Name:	us-gaap_LineOfCredit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant