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VARIABLE INTEREST ENTITIES - Schedule of the Carrying Amount of Interest in VIEs (Details) - CAD ($) $ in Millions	Dec. 31, 2024	May 29, 2024	Dec. 31, 2023	Nov. 30, 2023	Nov. 15, 2023
Woodfibre LNG LP \| Significantly Influenced Investees \| Gas Transmission
VARIABLE INTEREST ENTITY
Ownership interest (as percent)	30.00%
Whistler Parent JV
VARIABLE INTEREST ENTITY
Ownership interest (as percent)		19.00%
Whistler Parent JV \| Significantly Influenced Investees \| Gas Transmission
VARIABLE INTEREST ENTITY
Ownership interest (as percent)	19.00%	19.00%
Fox Squirrel Solar LLC
VARIABLE INTEREST ENTITY
Ownership interest (as percent)					50.00%
Fox Squirrel Solar LLC \| Affiliated Entity \| Renewable Power Generation
VARIABLE INTEREST ENTITY
Ownership interest (as percent)				50.00%
Fox Squirrel Solar LLC \| Significantly Influenced Investees \| Renewable Power Generation
VARIABLE INTEREST ENTITY
Ownership interest (as percent)	50.00%
Variable Interest Entity, Not Primary Beneficiary
VARIABLE INTEREST ENTITY
Carrying amount of investment in VIE	$ 3,125		$ 1,909
Maximum exposure to loss	5,883		4,647
Variable Interest Entity, Not Primary Beneficiary \| Aux Sable Liquid Products, L.P.
VARIABLE INTEREST ENTITY
Carrying amount of investment in VIE			105
Maximum exposure to loss			130
Variable Interest Entity, Not Primary Beneficiary \| Rampion Offshore Wind Limited
VARIABLE INTEREST ENTITY
Carrying amount of investment in VIE	387		391
Maximum exposure to loss	490		452
Variable Interest Entity, Not Primary Beneficiary \| Rampion Offshore Wind Limited \| Affiliated Entity
VARIABLE INTEREST ENTITY
Affiliate loan receivable	73		0
Variable Interest Entity, Not Primary Beneficiary \| Vector Pipeline L.P.
VARIABLE INTEREST ENTITY
Carrying amount of investment in VIE	193		191
Maximum exposure to loss	314		320
Variable Interest Entity, Not Primary Beneficiary \| Vector Pipeline L.P. \| Affiliated Entity
VARIABLE INTEREST ENTITY
Affiliate loan receivable	16		24
Credit facility provided	105		105
Variable Interest Entity, Not Primary Beneficiary \| Woodfibre LNG LP
VARIABLE INTEREST ENTITY
Carrying amount of investment in VIE	1,275		778
Maximum exposure to loss	3,153		2,854
Variable Interest Entity, Not Primary Beneficiary \| Whistler Parent JV
VARIABLE INTEREST ENTITY
Carrying amount of investment in VIE	1,102
Maximum exposure to loss	1,425
Variable Interest Entity, Not Primary Beneficiary \| Fox Squirrel Solar LLC
VARIABLE INTEREST ENTITY
Carrying amount of investment in VIE			312
Maximum exposure to loss			661
Variable Interest Entity, Not Primary Beneficiary \| Other
VARIABLE INTEREST ENTITY
Carrying amount of investment in VIE	168		132
Maximum exposure to loss	$ 501		$ 230