VARIABLE INTEREST ENTITIES - Schedule of Assets and Liabilities of Consolidated VIEs (Details) - CAD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Assets
Cash and cash equivalents	$ 648	$ 518
Restricted cash	28	119
Accounts receivable and other	6,781	6,517
Accounts receivable from affiliates	69	79
Inventory	1,299	1,339
Total Current assets	8,825	8,572
Property, plant and equipment, net	93,723	94,540
Long-term investments	16,528	16,707
Restricted long-term investments	434	323
Deferred amounts and other assets	7,433	8,558
Intangible assets, net	2,173	2,372
Goodwill	33,153	34,459
Total assets	163,269	166,905
Liabilities
Short-term borrowings	898	1,024
Accounts payable and other	10,063	9,863
Accounts payable to affiliates	21	40
Interest payable	624	669
Environmental liabilities		27
Current portion of long-term debt	4,404	3,259
Total Current liabilities	16,010	14,855
Long-term debt	59,661	60,327
Other long-term liabilities	8,324	8,834
Deferred income taxes	8,867	8,080
Total Liabilities	93,862	93,470
Variable Interest Entity, Primary Beneficiary
Assets
Cash and cash equivalents	208	506
Restricted cash	1	61
Accounts receivable and other	76	2,006
Accounts receivable from affiliates	0	38
Inventory	4	244
Total Current assets	289	2,855
Property, plant and equipment, net	3,392	72,349
Long-term investments	15	6,481
Restricted long-term investments	69	244
Deferred amounts and other assets	4	3,156
Intangible assets, net	124	705
Goodwill	0	29
Deferred income taxes	0	131
Total assets	3,893	85,950
Liabilities
Short-term borrowings	0	275
Accounts payable and other	56	2,925
Accounts payable to affiliates	0	4
Interest payable	0	303
Environmental liabilities	0	22
Current portion of long-term debt	0	1,034
Total Current liabilities	56	4,563
Long-term debt	0	29,577
Other long-term liabilities	130	5,074
Deferred income taxes	5	6,911
Total Liabilities	191	46,125
Net assets before noncontrolling interests	$ 3,702	$ 39,825