CONDENSED CONSOLIDATING FINANCIAL INFORMATION - Statement of Financial Position (Details) - CAD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018
Current assets
Cash and cash equivalents	$ 815	$ 518
Restricted cash	57	119
Accounts receivable and other	5,833	6,517
Accounts receivable from affiliates	89	79
Short-term loans receivable from affiliates	0	0
Inventory	1,261	1,339
Total current assets	8,055	8,572
Property, plant and equipment, net	94,379	94,540
Long-term loans receivable from affiliates	0	0
Investments in subsidiaries	0	0
Long-term investments	16,831	16,707
Restricted long-term investments	413	323
Deferred amounts and other assets	9,866	8,558
Intangible assets, net	2,216	2,372
Goodwill	33,668	34,459
Deferred income taxes	1,213	1,374
Total assets	166,641	166,905
Current liabilities
Short-term borrowings	1,269	1,024
Accounts payable and other	7,130	9,863
Accounts payable to affiliates	47	40
Interest payable	566	669
Short-term loans payable to affiliates	0	0
Current portion of long-term debt	4,536	3,259
Total current liabilities	13,548	14,855
Long-term debt	60,879	60,327
Other long-term liabilities	9,433	8,834
Long-term loans payable to affiliates	0	0
Deferred income taxes	10,105	9,454
Total liabilities	93,965	93,470
Equity
Controlling interests	69,287	69,470
Noncontrolling interests	3,389	3,965
Total equity	72,676	73,435	$ 67,898
Total liabilities and equity	166,641	166,905
Consolidating and elimination adjustments
Current assets
Cash and cash equivalents	0	0
Restricted cash	0	0
Accounts receivable and other	0	0
Accounts receivable from affiliates	(2,095)	(518)
Short-term loans receivable from affiliates	(14,327)	(8,285)
Inventory	0	0
Total current assets	(16,422)	(8,803)
Property, plant and equipment, net	0	0
Long-term loans receivable from affiliates	(94,874)	(14,274)
Investments in subsidiaries	(120,045)	(120,181)
Long-term investments	(581)	(3,682)
Restricted long-term investments	0	0
Deferred amounts and other assets	(1,375)	(1,726)
Intangible assets, net	0	0
Goodwill	0	0
Deferred income taxes	0	328
Total assets	(233,297)	(148,338)
Current liabilities
Short-term borrowings	0	0
Accounts payable and other	(200)	(6)
Accounts payable to affiliates	(2,095)	(518)
Interest payable	0	0
Short-term loans payable to affiliates	(14,327)	(8,285)
Current portion of long-term debt	0	0
Total current liabilities	(16,622)	(8,809)
Long-term debt	0	0
Other long-term liabilities	(1,375)	(1,726)
Long-term loans payable to affiliates	(94,874)	(14,274)
Deferred income taxes	(4,379)	(4,400)
Total liabilities	(117,250)	(29,209)
Equity
Controlling interests	(119,436)	(123,094)
Noncontrolling interests	3,389	3,965
Total equity	(116,047)	(119,129)
Total liabilities and equity	(233,297)	(148,338)
Parent Issuer and Guarantor | Reportable Legal Entities
Current assets
Cash and cash equivalents	0	0
Restricted cash	9	9
Accounts receivable and other	164	283
Accounts receivable from affiliates	783	726
Short-term loans receivable from affiliates	3,992	3,943
Inventory	0	0
Total current assets	4,948	4,961
Property, plant and equipment, net	202	140
Long-term loans receivable from affiliates	51,727	10,318
Investments in subsidiaries	79,746	78,474
Long-term investments	1,752	4,561
Restricted long-term investments	0	0
Deferred amounts and other assets	1,527	1,700
Intangible assets, net	232	234
Goodwill	0	0
Deferred income taxes	681	817
Total assets	140,815	101,205
Current liabilities
Short-term borrowings	0	0
Accounts payable and other	921	2,742
Accounts payable to affiliates	842	946
Interest payable	222	283
Short-term loans payable to affiliates	367	426
Current portion of long-term debt	2,092	1,853
Total current liabilities	4,444	6,250
Long-term debt	25,232	22,893
Other long-term liabilities	2,361	2,428
Long-term loans payable to affiliates	39,936	76
Deferred income taxes	0	0
Total liabilities	71,973	31,647
Equity
Controlling interests	68,842	69,558
Noncontrolling interests	0	0
Total equity	68,842	69,558
Total liabilities and equity	140,815	101,205
Subsidiary Non-Guarantors | Reportable Legal Entities
Current assets
Cash and cash equivalents	808	502
Restricted cash	48	110
Accounts receivable and other	5,661	6,211
Accounts receivable from affiliates	1,370	(142)
Short-term loans receivable from affiliates	5,160	653
Inventory	1,261	1,339
Total current assets	14,308	8,673
Property, plant and equipment, net	94,177	94,400
Long-term loans receivable from affiliates	40,637	1,344
Investments in subsidiaries	15,319	15,567
Long-term investments	14,710	14,841
Restricted long-term investments	413	323
Deferred amounts and other assets	9,709	8,558
Intangible assets, net	1,984	2,138
Goodwill	33,668	34,459
Deferred income taxes	532	229
Total assets	225,457	180,532
Current liabilities
Short-term borrowings	1,269	1,024
Accounts payable and other	6,376	7,086
Accounts payable to affiliates	(85)	(677)
Interest payable	231	225
Short-term loans payable to affiliates	9,167	7,177
Current portion of long-term debt	1,253	723
Total current liabilities	18,211	15,558
Long-term debt	26,593	23,215
Other long-term liabilities	8,391	8,100
Long-term loans payable to affiliates	53,482	12,696
Deferred income taxes	14,218	13,523
Total liabilities	120,895	73,092
Equity
Controlling interests	104,562	107,440
Noncontrolling interests	0	0
Total equity	104,562	107,440
Total liabilities and equity	225,457	180,532
Spectra Energy Partners L P | Subsidiary Issuer and Guarantor - SEP and EEP | Reportable Legal Entities
Current assets
Cash and cash equivalents	6	16
Restricted cash	0	0
Accounts receivable and other	1	15
Accounts receivable from affiliates	3	0
Short-term loans receivable from affiliates	0	0
Inventory	0	0
Total current assets	10	31
Property, plant and equipment, net	0	0
Long-term loans receivable from affiliates	73	73
Investments in subsidiaries	18,903	19,777
Long-term investments	950	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	19,937	20,877
Current liabilities
Short-term borrowings	0	0
Accounts payable and other	31	7
Accounts payable to affiliates	1	233
Interest payable	24	56
Short-term loans payable to affiliates	2,437	682
Current portion of long-term debt	529	0
Total current liabilities	3,022	978
Long-term debt	4,526	7,276
Other long-term liabilities	35	2
Long-term loans payable to affiliates		0
Deferred income taxes	266	331
Total liabilities	7,849	8,587
Equity
Controlling interests	12,088	12,290
Noncontrolling interests	0	0
Total equity	12,088	12,290
Total liabilities and equity	19,937	20,877
Enbridge Energy Partners, L.P. | Subsidiary Issuer and Guarantor - SEP and EEP | Reportable Legal Entities
Current assets
Cash and cash equivalents	1	0
Restricted cash	0	0
Accounts receivable and other	7	8
Accounts receivable from affiliates	28	13
Short-term loans receivable from affiliates	5,175	3,689
Inventory	0	0
Total current assets	5,211	3,710
Property, plant and equipment, net	0	0
Long-term loans receivable from affiliates	2,437	2,539
Investments in subsidiaries	6,077	6,363
Long-term investments	0	0
Restricted long-term investments	0	0
Deferred amounts and other assets	4	17
Intangible assets, net	0	0
Goodwill	0	0
Deferred income taxes	0	0
Total assets	13,729	12,629
Current liabilities
Short-term borrowings	0	0
Accounts payable and other	2	34
Accounts payable to affiliates	1,384	56
Interest payable	89	105
Short-term loans payable to affiliates	2,356	0
Current portion of long-term debt	662	683
Total current liabilities	4,493	878
Long-term debt	4,528	6,943
Other long-term liabilities	21	30
Long-term loans payable to affiliates	1,456	1,502
Deferred income taxes	0	0
Total liabilities	10,498	9,353
Equity
Controlling interests	3,231	3,276
Noncontrolling interests	0	0
Total equity	3,231	3,276
Total liabilities and equity	$ 13,729	$ 12,629