VARIABLE INTEREST ENTITIES - Schedule of Assets and Liabilities of Consolidated VIEs (Details) - CAD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Assets
Cash and cash equivalents	$ 861	$ 286
Restricted cash	46	34
Accounts receivable and other	8,871	6,862
Inventory	2,255	1,670
Current assets	12,147	8,959
Property, plant and equipment, net	104,460	100,067	$ 94,571
Long-term investments	15,936	13,324
Restricted long-term investments	593	630
Deferred amounts and other assets	9,542	8,613
Intangible assets, net	4,018	4,008
Total assets	179,608	168,864
Liabilities
Accounts payable and other	11,392	9,767
Current liabilities	20,301	18,229
Other long-term liabilities	9,189	7,617
Deferred income taxes	13,781	11,689
Liabilities	116,210	105,496
Variable Interest Entity, Primary Beneficiary
Assets
Cash and cash equivalents	426	247
Restricted cash	12	4
Accounts receivable and other	199	99
Accounts receivable from affiliates	23	0
Inventory	12	9
Current assets	672	359
Property, plant and equipment, net	7,707	3,052
Long-term investments	14	16
Restricted long-term investments	98	101
Deferred amounts and other assets	158	2
Intangible assets, net	102	108
Total assets	8,751	3,638
Liabilities
Accounts payable and other	251	84
Accounts payable to affiliates	21	0
Current liabilities	272	84
Other long-term liabilities	859	182
Deferred income taxes	5	5
Liabilities	1,136	271
Net assets	$ 7,615	$ 3,367