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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
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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 |  |

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