DEBT - CREDIT FACILITIES (Details) - Committed credit facilities CAD in Millions	Jun. 30, 2017 CAD
CREDIT FACILITIES
Total Facilities	CAD 25,234
Draws	14,477
Available	10,757
Enbridge Inc.
CREDIT FACILITIES
Total Facilities	6,826
Draws	5,686
Available	1,140
Enbridge (U.S.) Inc.
CREDIT FACILITIES
Total Facilities	3,805
Draws	2,216
Available	1,589
Enbridge Energy Partners, L.P.
CREDIT FACILITIES
Total Facilities	3,409
Draws	1,994
Available	1,415
Enbridge Gas Distribution Inc.
CREDIT FACILITIES
Total Facilities	1,017
Draws	684
Available	333
Enbridge Income Fund
CREDIT FACILITIES
Total Facilities	1,500
Draws	771
Available	729
Enbridge Pipelines (Southern Lights) L.L.C.
CREDIT FACILITIES
Total Facilities	26
Available	26
Enbridge Pipelines Inc.
CREDIT FACILITIES
Total Facilities	3,000
Draws	1,105
Available	1,895
Enbridge Southern Lights LP
CREDIT FACILITIES
Total Facilities	5
Available	5
Spectra Energy Capital, LLC
CREDIT FACILITIES
Total Facilities	1,299
Available	1,299
Spectra Energy Partners, LP
CREDIT FACILITIES
Total Facilities	3,247
Draws	1,721
Available	1,526
Westcoast Energy Inc.
CREDIT FACILITIES
Total Facilities	400
Available	400
Union Gas Limited
CREDIT FACILITIES
Total Facilities	700
Draws	300
Available	CAD 400

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