LONG-TERM INVESTMENTS - Schedule of Long-Term Investments (Details) - CAD ($) $ in Millions	12 Months Ended
Dec. 31, 2018	Dec. 31, 2019
LONG-TERM INVESTMENTS
Total long-term investments	$ 16,707	$ 16,528
Enbridge Renewable Infrastructure Investments S.a.r.l. (ERII) \| Canada Pension Plan Investment Board (CPPIB)
LONG-TERM INVESTMENTS
Ownership interest sold (percent)	49.00%
Direct common interest (as a percent)	25.50%
Noverco \| Gas Distribution and Storage \| Preference shares
LONG-TERM INVESTMENTS
OTHER LONG-TERM INVESTMENTS	$ 478	$ 580
Gray Oak Holdings LLC
LONG-TERM INVESTMENTS
Ownership Interest (as a percent)	35.00%
Gray Oak Crude Oil Pipeline
LONG-TERM INVESTMENTS
Ownership Interest (as a percent)	22.80%
MarEn Bakken Company L.L.C. \| Liquids Pipelines
LONG-TERM INVESTMENTS
Ownership Interest (as a percent)		75.00%
EQUITY INVESTMENTS	$ 2,039	$ 1,892
MarEn Bakken Company L.L.C. \| Bakken Pipeline Investments, LLC
LONG-TERM INVESTMENTS
Ownership Interest (as a percent)		49.00%
MarEn Bakken Company L.L.C. \| Bakken Pipeline System
LONG-TERM INVESTMENTS
Ownership Interest (as a percent)		27.60%
Bakken Pipeline Investments, LLC \| Bakken Pipeline System
LONG-TERM INVESTMENTS
Ownership Interest (as a percent)		75.00%
Gray Oak Holdings LLC \| Liquids Pipelines
LONG-TERM INVESTMENTS
Ownership Interest (as a percent)		35.00%
EQUITY INVESTMENTS	0	$ 463
Seaway Crude Pipeline System \| Liquids Pipelines
LONG-TERM INVESTMENTS
Ownership Interest (as a percent)		50.00%
EQUITY INVESTMENTS	3,113	$ 2,907
Illinois Extension Pipeline Company, L.L.C. \| Liquids Pipelines
LONG-TERM INVESTMENTS
Ownership Interest (as a percent)		65.00%
EQUITY INVESTMENTS	724	$ 662
Other equity investments \| Liquids Pipelines
LONG-TERM INVESTMENTS
EQUITY INVESTMENTS	97	$ 73
Other equity investments \| Liquids Pipelines \| Minimum
LONG-TERM INVESTMENTS
Ownership Interest (as a percent)		30.00%
Other equity investments \| Liquids Pipelines \| Maximum
LONG-TERM INVESTMENTS
Ownership Interest (as a percent)		43.80%
Other equity investments \| Gas Transmission and Midstream
LONG-TERM INVESTMENTS
EQUITY INVESTMENTS	6	$ 5
Other equity investments \| Gas Transmission and Midstream \| Minimum
LONG-TERM INVESTMENTS
Ownership Interest (as a percent)		33.30%
Other equity investments \| Gas Transmission and Midstream \| Maximum
LONG-TERM INVESTMENTS
Ownership Interest (as a percent)		50.00%
Other equity investments \| Gas Distribution and Storage \| Common Shares
LONG-TERM INVESTMENTS
Ownership Interest (as a percent)		50.00%
EQUITY INVESTMENTS	15	$ 14
Other equity investments \| Renewable Power Generation
LONG-TERM INVESTMENTS
EQUITY INVESTMENTS	72	$ 127
Other equity investments \| Renewable Power Generation \| Minimum
LONG-TERM INVESTMENTS
Ownership Interest (as a percent)		21.00%
Other equity investments \| Renewable Power Generation \| Maximum
LONG-TERM INVESTMENTS
Ownership Interest (as a percent)		50.00%
Other equity investments \| Eliminations and Other
LONG-TERM INVESTMENTS
EQUITY INVESTMENTS	10	$ 16
Other equity investments \| Eliminations and Other \| Minimum
LONG-TERM INVESTMENTS
Ownership Interest (as a percent)		42.70%
Other equity investments \| Eliminations and Other \| Maximum
LONG-TERM INVESTMENTS
Ownership Interest (as a percent)		50.00%
Alliance Pipeline \| Gas Transmission and Midstream
LONG-TERM INVESTMENTS
Ownership Interest (as a percent)		50.00%
EQUITY INVESTMENTS	368	$ 310
Aux Sable \| Gas Transmission and Midstream
LONG-TERM INVESTMENTS
EQUITY INVESTMENTS	311	$ 267
Aux Sable \| Gas Transmission and Midstream \| Minimum
LONG-TERM INVESTMENTS
Ownership Interest (as a percent)		42.70%
Aux Sable \| Gas Transmission and Midstream \| Maximum
LONG-TERM INVESTMENTS
Ownership Interest (as a percent)		50.00%
DCP Midstream, LLC \| Gas Transmission and Midstream
LONG-TERM INVESTMENTS
Ownership Interest (as a percent)		50.00%
EQUITY INVESTMENTS	2,368	$ 2,193
Gulfstream Natural Gas System, L.L.C. \| Gas Transmission and Midstream
LONG-TERM INVESTMENTS
Ownership Interest (as a percent)		50.00%
EQUITY INVESTMENTS	1,289	$ 1,213
Nexus Gas Transmission, LLC \| Gas Transmission and Midstream
LONG-TERM INVESTMENTS
Ownership Interest (as a percent)		50.00%
EQUITY INVESTMENTS	1,757	$ 1,778
Offshore - various joint ventures \| Gas Transmission and Midstream
LONG-TERM INVESTMENTS
EQUITY INVESTMENTS	400	$ 362
Offshore - various joint ventures \| Gas Transmission and Midstream \| Minimum
LONG-TERM INVESTMENTS
Ownership Interest (as a percent)		22.00%
Offshore - various joint ventures \| Gas Transmission and Midstream \| Maximum
LONG-TERM INVESTMENTS
Ownership Interest (as a percent)		74.30%
PennEast Pipeline Company, LLC \| Gas Transmission and Midstream
LONG-TERM INVESTMENTS
Ownership Interest (as a percent)		20.00%
EQUITY INVESTMENTS	97	$ 106
Sabal Trail Transmission, LLC \| Gas Transmission and Midstream
LONG-TERM INVESTMENTS
Ownership Interest (as a percent)		50.00%
EQUITY INVESTMENTS	1,586	$ 1,533
Southeast Supply Header L.L.C. \| Gas Transmission and Midstream
LONG-TERM INVESTMENTS
Ownership Interest (as a percent)		50.00%
EQUITY INVESTMENTS	519	$ 484
Steckman Ridge LP \| Gas Transmission and Midstream
LONG-TERM INVESTMENTS
Ownership Interest (as a percent)		49.50%
EQUITY INVESTMENTS	237	$ 222
Vector Pipeline L.P. \| Gas Transmission and Midstream
LONG-TERM INVESTMENTS
Ownership Interest (as a percent)		60.00%
EQUITY INVESTMENTS	$ 198	$ 195
Noverco \| Gas Distribution and Storage \| Common Shares
LONG-TERM INVESTMENTS
Ownership Interest (as a percent)	38.90%	38.90%
EQUITY INVESTMENTS	$ 0	$ 95
Eolien Maritime France SAS \| Renewable Power Generation
LONG-TERM INVESTMENTS
Ownership Interest (as a percent)		50.00%
EQUITY INVESTMENTS	68	$ 67
Enbridge Renewable Infrastructure Investments S.a.r.l. (ERII) \| Renewable Power Generation
LONG-TERM INVESTMENTS
Ownership Interest (as a percent)		51.00%
EQUITY INVESTMENTS	127	$ 141
Rampion Offshore Wind Project \| Renewable Power Generation
LONG-TERM INVESTMENTS
Ownership Interest (as a percent)		24.90%
EQUITY INVESTMENTS	638	$ 600
Emerging Technologies and Other \| Renewable Power Generation
LONG-TERM INVESTMENTS
OTHER LONG-TERM INVESTMENTS	80	78
Other long-term investments \| Eliminations and Other
LONG-TERM INVESTMENTS
OTHER LONG-TERM INVESTMENTS	$ 110	$ 145

Variable Interest Entity, Qualitative or Quantitative Information, Ownership Interest Sold, Percentage

No definition available.

Name:	enb_VariableInterestEntityQualitativeorQuantitativeInformationOwnershipInterestSoldPercentage
Namespace Prefix:	enb_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571

+ Details

Name:	us-gaap_EquityMethodInvestmentOwnershipPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=109237563&loc=d3e33749-111570

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 25
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8813-108599

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.12)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_EquityMethodInvestments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The total amount of investments that are intended to be held for an extended period of time (longer than one operating cycle).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.12)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_LongTermInvestments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of long-term investments classified as other.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.1(f))
-URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.12)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_OtherLongTermInvestments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_ScheduleOfEquityMethodInvestmentsLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 5A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=118582676&loc=SL6759159-111685

+ Details

Name:	us-gaap_VariableInterestEntityOwnershipPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration