DEBT - Narrative (Details) $ in Millions, $ in Millions				1 Months Ended	3 Months Ended		6 Months Ended
	Jul. 23, 2021 CAD ($)	Feb. 25, 2021 USD ($) debt_instrument	Feb. 10, 2021 CAD ($)	Feb. 28, 2021 USD ($)	Jun. 30, 2021 CAD ($)	Jun. 30, 2020 CAD ($)	Jun. 30, 2021 CAD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2020 CAD ($)	Jun. 30, 2021 USD ($)	Dec. 31, 2020 CAD ($)
Line of Credit Facility [Line Items]
Principal Amount							$ 808	$ 880
Commitment fee percentage							0.20%	0.20%
Long-term debt					$ 63,090		$ 63,090				$ 62,819
Principal amount of debt					800		800			$ 2,000
Long-term debt, fair value adjustment					703		703				750
Amortization of fair value adjustment					13	$ 14	25		$ 29
Term Loan
Line of Credit Facility [Line Items]
Number of term loans repaid | debt_instrument		2
Principal Amount		$ 500
Commercial paper and credit facility draws
Line of Credit Facility [Line Items]
Long-term debt					9,000		9,000				9,900
Fixed-to-floating subordinated term notes | Subordinated term notes
Line of Credit Facility [Line Items]
Subordinated debt					7,600		7,600
Fixed-to-fixed subordinated term notes | Subordinated term notes
Line of Credit Facility [Line Items]
Subordinated debt											7,800
Floating rate notes due February 2023 | Enbridge Inc.
Line of Credit Facility [Line Items]
Term of debt instrument				2 years
Principal amount of debt				$ 500
Floating rate notes due February 2023 | SOFR | Enbridge Inc.
Line of Credit Facility [Line Items]
Spread on variable rate (percent)				0.40%
Committed credit facilities
Line of Credit Facility [Line Items]
Amount of credit facility					20,936		20,936
Unutilized amount of facility					8,510		$ 8,510
Committed credit facilities | Enbridge Inc.
Line of Credit Facility [Line Items]
Term out provision							1 year	1 year
Amount of credit facility					9,125		$ 9,125
Unutilized amount of facility					1,679		$ 1,679
Committed credit facilities | Enbridge Pipelines Inc.
Line of Credit Facility [Line Items]
Term out provision							1 year	1 year
Amount of credit facility					3,000		$ 3,000
Unutilized amount of facility					2,506		$ 2,506
Committed credit facilities | Enbridge Gas Inc.
Line of Credit Facility [Line Items]
Term out provision							1 year	1 year
Amount of credit facility					2,000		$ 2,000
Unutilized amount of facility					590		$ 590
Committed credit facilities | Enbridge (U.S.) Inc.
Line of Credit Facility [Line Items]
Term out provision							1 year	1 year
Amount of credit facility					6,811		$ 6,811
Unutilized amount of facility					3,735		3,735
Revolving credit facility | Sustainability-linked Credit Facility
Line of Credit Facility [Line Items]
Term of debt instrument			3 years
Amount of credit facility			$ 1,000
Revolving credit facility | Syndicated Credit Facility
Line of Credit Facility [Line Items]
Term of debt instrument			1 year
Credit facility terminated			$ 3,000
Revolving credit facility | 364-Day Extendible Credit Facilities | Subsequent event
Line of Credit Facility [Line Items]
Term out provision	1 year
Term of debt instrument	364 days
Amount of credit facility	$ 10,000
Revolving credit facility | Five-Year Credit Facilities | Subsequent event
Line of Credit Facility [Line Items]
Term of debt instrument	5 years
Amount of credit facility	$ 8,000
Uncommitted demand credit facilities
Line of Credit Facility [Line Items]
Amount of credit facility					1,400		1,400				849
Unutilized amount of facility					$ 978		$ 978				$ 533