CONDENSED CONSOLIDATING FINANCIAL INFORMATION - Condensed Consolidating Statements of Financial Position (Details) - CAD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	$ 648	$ 518
Restricted cash	28	119
Accounts receivable and other	6,781	6,517
Accounts receivable from affiliates	69	79
Short-term loans receivable from affiliates	0	0
Inventory	1,299	1,339
Total Current assets	8,825	8,572
Property, plant and equipment, net	93,723	94,540
Long-term loans receivable from affiliates	0	0
Investments in subsidiaries	0	0
Long-term investments (Note 13)	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
Deferred income taxes	1,000	1,374
Total assets	163,269	166,905
Short-term borrowings	898	1,024
Accounts payable and other	10,063	9,836
Accounts payable to affiliates	21	40
Interest payable	624	669
Short-term loans payable to affiliates	0	0
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
Long-term loans payable to affiliates	0	0
Deferred income taxes	9,867	9,454
Total Liabilities	93,862	93,470
Controlling interests	66,043	69,470
Noncontrolling interests	3,364	3,965
Total Equity	69,407	73,435	$ 65,732
Total liabilities and equity	163,269	166,905
Eliminations and Other
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	0	0
Restricted cash	0	0
Accounts receivable and other	0	0
Accounts receivable from affiliates	(525)	(518)
Short-term loans receivable from affiliates	(10,069)	(8,285)
Inventory	0	0
Total Current assets	(10,594)	(8,803)
Property, plant and equipment, net	0	0
Long-term loans receivable from affiliates	(85,417)	(14,274)
Investments in subsidiaries	(119,374)	(120,181)
Long-term investments (Note 13)	(572)	(3,682)
Restricted long-term investments	0	0
Deferred amounts and other assets	(849)	(1,726)
Intangible assets, net	0	0
Goodwill	0	0
Deferred income taxes	0	328
Total assets	(216,806)	(148,338)
Short-term borrowings	0	0
Accounts payable and other	(476)	(6)
Accounts payable to affiliates	(525)	(518)
Interest payable	0	0
Short-term loans payable to affiliates	(10,069)	(8,285)
Environmental liabilities		0
Current portion of long-term debt	0	0
Total Current liabilities	(11,070)	(8,809)
Long-term debt	0	0
Other long-term liabilities	(849)	(1,726)
Long-term loans payable to affiliates	(85,417)	(14,274)
Deferred income taxes	(4,291)	(4,400)
Total Liabilities	(101,627)	(29,209)
Controlling interests	(118,543)	(123,094)
Noncontrolling interests	3,364	3,965
Total Equity	(115,179)	(119,129)
Total liabilities and equity	(216,806)	(148,338)
Parent Issuer and Guarantor | Parent and Subsidiaries
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	0	0
Restricted cash	9	9
Accounts receivable and other	429	283
Accounts receivable from affiliates	746	726
Short-term loans receivable from affiliates	1,691	3,943
Inventory	0	0
Total Current assets	2,875	4,961
Property, plant and equipment, net	248	140
Long-term loans receivable from affiliates	47,285	10,318
Investments in subsidiaries	80,456	78,474
Long-term investments (Note 13)	1,701	4,561
Restricted long-term investments	0	0
Deferred amounts and other assets	998	1,700
Intangible assets, net	247	234
Goodwill	0	0
Deferred income taxes	486	817
Total assets	134,296	101,205
Short-term borrowings	0	0
Accounts payable and other	2,765	2,742
Accounts payable to affiliates	736	946
Interest payable	279	283
Short-term loans payable to affiliates	367	426
Environmental liabilities		0
Current portion of long-term debt	2,160	1,853
Total Current liabilities	6,307	6,250
Long-term debt	27,290	22,893
Other long-term liabilities	1,295	2,428
Long-term loans payable to affiliates	33,686	76
Deferred income taxes	0	0
Total Liabilities	68,578	31,647
Controlling interests	65,718	69,558
Noncontrolling interests	0	0
Total Equity	65,718	69,558
Total liabilities and equity	134,296	101,205
Subsidiary Non-Guarantors | Parent and Subsidiaries
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	611	502
Restricted cash	19	110
Accounts receivable and other	6,340	6,211
Accounts receivable from affiliates	(164)	(142)
Short-term loans receivable from affiliates	4,417	653
Inventory	1,299	1,339
Total Current assets	12,522	8,673
Property, plant and equipment, net	93,475	94,400
Long-term loans receivable from affiliates	35,672	1,344
Investments in subsidiaries	14,782	15,567
Long-term investments (Note 13)	14,467	14,841
Restricted long-term investments	434	323
Deferred amounts and other assets	7,282	8,558
Intangible assets, net	1,926	2,138
Goodwill	33,153	34,459
Deferred income taxes	514	229
Total assets	214,227	180,532
Short-term borrowings	898	1,024
Accounts payable and other	7,745	7,059
Accounts payable to affiliates	(640)	(677)
Interest payable	242	225
Short-term loans payable to affiliates	5,653	7,177
Environmental liabilities		27
Current portion of long-term debt	1,726	723
Total Current liabilities	15,624	15,558
Long-term debt	24,147	23,215
Other long-term liabilities	7,864	8,100
Long-term loans payable to affiliates	48,619	12,696
Deferred income taxes	13,887	13,523
Total Liabilities	110,141	73,092
Controlling interests	104,086	107,440
Noncontrolling interests	0	0
Total Equity	104,086	107,440
Total liabilities and equity	214,227	180,532
Spectra Energy Partners, LP | Subsidiary Issuer and Guarantor | Parent and Subsidiaries
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	33	16
Restricted cash	0	0
Accounts receivable and other	8	15
Accounts receivable from affiliates	0	0
Short-term loans receivable from affiliates	0	0
Inventory	0	0
Total Current assets	41	31
Property, plant and equipment, net	0	0
Long-term loans receivable from affiliates	73	73
Investments in subsidiaries	18,956	19,777
Long-term investments (Note 13)	932	987
Restricted long-term investments	0	0
Deferred amounts and other assets	1	9
Intangible assets, net	0	0
Goodwill	0	0
Deferred income taxes	0	0
Total assets	20,003	20,877
Short-term borrowings	0	0
Accounts payable and other	28	7
Accounts payable to affiliates	367	233
Interest payable	52	56
Short-term loans payable to affiliates	2,058	682
Environmental liabilities		0
Current portion of long-term debt	518	0
Total Current liabilities	3,023	978
Long-term debt	4,435	7,276
Other long-term liabilities	2	2
Long-term loans payable to affiliates	0	0
Deferred income taxes	271	331
Total Liabilities	7,731	8,587
Controlling interests	12,272	12,290
Noncontrolling interests	0	0
Total Equity	12,272	12,290
Total liabilities and equity	20,003	20,877
Enbridge Energy Partners, L.P. | Subsidiary Issuer and Guarantor | Parent and Subsidiaries
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	4	0
Restricted cash	0	0
Accounts receivable and other	4	8
Accounts receivable from affiliates	12	13
Short-term loans receivable from affiliates	3,961	3,689
Inventory	0	0
Total Current assets	3,981	3,710
Property, plant and equipment, net	0	0
Long-term loans receivable from affiliates	2,387	2,539
Investments in subsidiaries	5,180	6,363
Long-term investments (Note 13)	0	0
Restricted long-term investments	0	0
Deferred amounts and other assets	1	17
Intangible assets, net	0	0
Goodwill	0	0
Deferred income taxes	0	0
Total assets	11,549	12,629
Short-term borrowings	0	0
Accounts payable and other	1	34
Accounts payable to affiliates	83	56
Interest payable	51	105
Short-term loans payable to affiliates	1,991	0
Environmental liabilities		0
Current portion of long-term debt	0	683
Total Current liabilities	2,126	878
Long-term debt	3,789	6,943
Other long-term liabilities	12	30
Long-term loans payable to affiliates	3,112	1,502
Deferred income taxes	0	0
Total Liabilities	9,039	9,353
Controlling interests	2,510	3,276
Noncontrolling interests	0	0
Total Equity	2,510	3,276
Total liabilities and equity	$ 11,549	$ 12,629