DEBT - Narrative (Details) $ in Thousands, $ in Millions					1 Months Ended	3 Months Ended		9 Months Ended
	Oct. 04, 2021 USD ($) Tranche	Jul. 23, 2021 CAD ($)	Feb. 25, 2021 USD ($) debt_instrument	Feb. 10, 2021 CAD ($)	Feb. 28, 2021 USD ($)	Sep. 30, 2021 CAD ($)	Sep. 30, 2020 CAD ($)	Sep. 30, 2021 CAD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2020 CAD ($)	Sep. 30, 2021 USD ($)	Jun. 30, 2021 USD ($)	Dec. 31, 2020 CAD ($)
Line of Credit Facility [Line Items]
Principal Amount								$ 808,000	$ 880
Commitment fee percentage								0.10%	0.10%
Long-term debt						$ 65,036,000		$ 65,036,000					$ 62,819,000
Principal amount of debt						3,200,000		3,200,000			$ 2,400
Long-term debt, fair value adjustment						687,000		687,000					750,000
Amortization of fair value adjustment						11,000	$ 13,000	36,000		$ 42,000
Term Loan
Line of Credit Facility [Line Items]
Number of term loans repaid | debt_instrument			2
Principal Amount			$ 500
Subsequent event | Senior Notes
Line of Credit Facility [Line Items]
Principal amount of debt	$ 1,500
Number of tranches | Tranche	3
Commercial paper and credit facility draws
Line of Credit Facility [Line Items]
Long-term debt						8,300,000		8,300,000					9,900,000
Fixed-to-floating subordinated term notes | Subordinated term notes
Line of Credit Facility [Line Items]
Subordinated debt						7,700,000		7,700,000
Fixed-to-fixed subordinated term notes | Subordinated term notes
Line of Credit Facility [Line Items]
Subordinated debt													7,800,000
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%
0.55% 2-Year Senior Notes | Subsequent event | Senior Notes
Line of Credit Facility [Line Items]
Term of debt instrument	2 years
Principal amount of debt	$ 500
Interest rate (as a percent)	0.55%
1.60% 5-Year Senior Notes | Subsequent event | Senior Notes
Line of Credit Facility [Line Items]
Term of debt instrument	5 years
Principal amount of debt	$ 500
Interest rate (as a percent)	1.60%
3.40% senior notes due August 2051 | Enbridge Inc.
Line of Credit Facility [Line Items]
Principal amount of debt												$ 500
Interest rate (as a percent)												3.40%
3.40% senior notes due August 2051 | Subsequent event | Senior Notes
Line of Credit Facility [Line Items]
Principal amount of debt	$ 500
Interest rate (as a percent)	3.40%
Committed credit facilities
Line of Credit Facility [Line Items]
Amount of credit facility						21,137,000		21,137,000
Unutilized amount of facility						9,570,000		$ 9,570,000
Committed credit facilities | Enbridge Inc.
Line of Credit Facility [Line Items]
Term out provision								1 year	1 year
Amount of credit facility						9,169,000		$ 9,169,000
Unutilized amount of facility						1,791,000		$ 1,791,000
Committed credit facilities | Enbridge Pipelines Inc.
Line of Credit Facility [Line Items]
Term out provision								1 year	1 year
Amount of credit facility						3,000,000		$ 3,000,000
Unutilized amount of facility						2,531,000		$ 2,531,000
Committed credit facilities | Enbridge Gas Inc.
Line of Credit Facility [Line Items]
Term out provision								1 year	1 year
Amount of credit facility						2,000,000		$ 2,000,000
Unutilized amount of facility						795,000		$ 795,000
Committed credit facilities | Enbridge (U.S.) Inc.
Line of Credit Facility [Line Items]
Term out provision								1 year	1 year
Amount of credit facility						6,968,000		$ 6,968,000
Unutilized amount of facility						4,453,000		4,453,000
Revolving credit facility | Sustainability-linked Credit Facility
Line of Credit Facility [Line Items]
Term of debt instrument				3 years
Amount of credit facility				$ 1,000,000
Revolving credit facility | Syndicated Credit Facility
Line of Credit Facility [Line Items]
Term of debt instrument				1 year
Credit facility terminated				$ 3,000,000
Revolving credit facility | 364-Day Extendible Credit Facilities
Line of Credit Facility [Line Items]
Term out provision		1 year
Term of debt instrument		364 days
Amount of credit facility		$ 10,000,000
Revolving credit facility | Five-Year Credit Facilities
Line of Credit Facility [Line Items]
Term of debt instrument		5 years
Amount of credit facility		$ 8,000,000
Uncommitted demand credit facilities
Line of Credit Facility [Line Items]
Amount of credit facility						1,300,000		1,300,000					849,000
Unutilized amount of facility						$ 868,000		$ 868,000					$ 533,000