LONG-TERM INVESTMENTS - Narrative (Details) € in Millions, $ in Millions, $ in Millions										12 Months Ended
	Nov. 15, 2023 CAD ($)	Nov. 15, 2023 USD ($)	Nov. 03, 2023 CAD ($)	Nov. 03, 2023 EUR (€)	Nov. 29, 2022 CAD ($)	Nov. 29, 2022 USD ($)	Aug. 17, 2022 CAD ($)	Aug. 17, 2022 USD ($)	Dec. 30, 2021 CAD ($)	Dec. 31, 2023 CAD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 CAD ($)	Dec. 31, 2021 CAD ($)	Nov. 03, 2023 EUR (€)	Jan. 09, 2023	Aug. 16, 2022	Jun. 06, 2021
Schedule of Equity Method Investments [Line Items]
Goodwill of investee										$ 3,500		$ 3,400
Amortizable assets of investee										1,700		1,500
Dividends received from equity investments										3,100		2,600	$ 2,200
Long-term debt										80,438
Proceeds from sale of equity method investments							$ 522	$ 404
Gain on joint venture merger transaction							$ 1,100	$ 832		0		1,076	0
Proceeds from joint venture merger transaction (Note 13)										0		522	0
Woodfibre LNG Limited
Schedule of Equity Method Investments [Line Items]
Payments to acquire equity method investments					$ 533	$ 392
Fox Squirrel Solar LLC
Schedule of Equity Method Investments [Line Items]
Ownership interest (as a percent)	50.00%	50.00%
Cash consideration includes an upfront payment	$ 157	$ 115								$ 164	$ 123
Investment company committed capital threshold amount	$ 398	$ 291
Gray Oak Pipeline, LLC
Schedule of Equity Method Investments [Line Items]
Ownership interest (as a percent)										65.00%
Gray Oak Pipeline, LLC | Gray Oak Pipeline, LLC
Schedule of Equity Method Investments [Line Items]
Ownership interest (as a percent)										58.50%					68.50%
Equity method investment direct ownership interest (as a percent)															0.100
Woodfibre LNG Limited
Schedule of Equity Method Investments [Line Items]
Ownership interest (as a percent)					30.00%	30.00%
Hohe See Offshore And Albatros Offshore Wind Farm
Schedule of Equity Method Investments [Line Items]
Ownership interest (as a percent)			49.90%											49.90%
Ownership interest acquired additionally (as a percent)			24.45%											24.45%
Payments to acquire equity method investments			$ 391	€ 267
Long-term debt			$ 524											€ 358
Gray Oak Holdings LLC
Schedule of Equity Method Investments [Line Items]
Ownership interest (as a percent)							58.50%	58.50%								22.80%
DCP LLC
Schedule of Equity Method Investments [Line Items]
Ownership interest (as a percent)							13.20%	13.20%								28.30%
Noverco Preferred Shares
Schedule of Equity Method Investments [Line Items]
Gain on joint venture merger transaction													303
Proceeds from joint venture merger transaction (Note 13)									$ 1,100
Noverco Preferred Shares | IPL Systems Inc
Schedule of Equity Method Investments [Line Items]
Ownership interest (as a percent)																	38.90%
PennEast Pipeline Company, LLC
Schedule of Equity Method Investments [Line Items]
Ownership interest (as a percent)										20.00%
Impairment of equity investments													$ 111
Equity investment										$ 0		$ 0