VARIABLE INTEREST ENTITIES - Schedule of Assets and Liabilities of Consolidated VIEs (Details) - CAD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Current assets
Cash and cash equivalents	$ 1,803	$ 5,901
Restricted cash	92	84
Other current assets	2,770	2,440
Inventory	1,488	1,479
Current assets	13,163	14,399
Property, plant and equipment, net	131,104	104,641	$ 104,460
Long-term investments	20,691	16,793
Restricted long-term investments and cash	998	717
Deferred amounts and other assets	11,034	8,041
Intangible assets, net	4,587	3,537
Total assets	218,973	180,317
Current liabilities
Trade payables and accrued liabilities	7,060	4,308
Other current liabilities	7,241	5,659
Accounts payable to affiliates	22	26
Current liabilities	23,812	17,435
Long-term debt	93,414	74,715
Other long-term liabilities	13,258	8,653
Deferred income taxes	19,596	15,031
Liabilities	150,080	115,834
Variable Interest Entity, Primary Beneficiary
Current assets
Cash and cash equivalents	448	442
Restricted cash	11	9
Trade receivables and unbilled revenues	138	144
Other current assets	5	8
Inventory	13	11
Current assets	628	619
Property, plant and equipment, net	6,934	7,105
Long-term investments	20	14
Restricted long-term investments and cash	141	106
Deferred amounts and other assets	145	148
Intangible assets, net	77	84
Total assets	7,945	8,076
Current liabilities
Other current liabilities	124	145
Current liabilities	254	232
Long-term debt	0	1
Other long-term liabilities	1,133	971
Deferred income taxes	6	5
Liabilities	1,393	1,209
Net assets	6,552	6,867
Variable Interest Entity, Primary Beneficiary | Related Party
Current assets
Accounts receivable from affiliates	13	5
Current liabilities
Accounts payable to affiliates	22	4
Variable Interest Entity, Primary Beneficiary | Nonrelated Party
Current liabilities
Trade payables and accrued liabilities	$ 108	$ 83