CONDENSED CONSOLIDATING FINANCIAL INFORMATION - Statement of Financial Position (Details) - CAD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018	Jun. 30, 2018
Current assets
Cash and cash equivalents	$ 708	$ 518
Restricted cash	59	119
Accounts receivable and other	6,257	6,517
Accounts receivable from affiliates	85	79
Short-term loans receivable from affiliates	0	0
Inventory	1,284	1,339
Total current assets	8,393	8,572
Property, plant and equipment, net	93,202	94,540
Long-term loans receivable from affiliates	0	0
Long-term investments	0	0
Long-term investments	16,531	16,707
Restricted long-term investments	389	323
Deferred amounts and other assets	9,552	8,558
Intangible assets, net	2,215	2,372
Goodwill	33,342	34,459
Deferred income taxes	1,204	1,374
Total assets	164,828	166,905
Current liabilities
Short-term borrowings	916	1,024
Accounts payable and other	7,156	9,863
Accounts payable to affiliates	26	40
Interest payable	626	669
Short-term loans payable to affiliates	0	0
Current portion of long-term debt	4,644	3,259
Total current liabilities	13,368	14,855
Long-term debt	60,017	60,327
Other long-term liabilities	8,871	8,834
Long-term loans payable to affiliates	0	0
Deferred income taxes	9,767	9,454
Total liabilities	92,023	93,470
Equity
Controlling interests	69,354	69,470
Noncontrolling interests	3,451	3,965
Total equity	72,805	73,435	$ 68,232
Total liabilities and equity	164,828	166,905
Consolidation, Eliminations
Current assets
Cash and cash equivalents	0	0
Restricted cash	0	0
Accounts receivable and other	0	0
Accounts receivable from affiliates	(1,048)	(518)
Short-term loans receivable from affiliates	(14,165)	(8,285)
Inventory	0	0
Total current assets	(15,213)	(8,803)
Property, plant and equipment, net	0	0
Long-term loans receivable from affiliates	(66,656)	(14,274)
Long-term investments	(119,658)	(120,181)
Long-term investments	(648)	(3,682)
Restricted long-term investments	0	0
Deferred amounts and other assets	(1,257)	(1,726)
Intangible assets, net	0	0
Goodwill	0	0
Deferred income taxes	0	328
Total assets	(203,432)	(148,338)
Current liabilities
Short-term borrowings	0	0
Accounts payable and other	141	(6)
Accounts payable to affiliates	(1,048)	(518)
Interest payable	0	0
Short-term loans payable to affiliates	(14,165)	(8,285)
Current portion of long-term debt	0	0
Total current liabilities	(15,072)	(8,809)
Long-term debt	0	0
Other long-term liabilities	(1,257)	(1,726)
Long-term loans payable to affiliates	(66,656)	(14,274)
Deferred income taxes	4,365	(4,400)
Total liabilities	(78,620)	(29,209)
Equity
Controlling interests	(128,263)	(123,094)
Noncontrolling interests	3,451	3,965
Total equity	(124,812)	(119,129)
Total liabilities and equity	(203,432)	(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	153	283
Accounts receivable from affiliates	786	726
Short-term loans receivable from affiliates	3,417	3,943
Inventory	0	0
Total current assets	4,365	4,961
Property, plant and equipment, net	161	140
Long-term loans receivable from affiliates	38,335	10,318
Long-term investments	78,955	78,474
Long-term investments	1,735	4,561
Restricted long-term investments	0	0
Deferred amounts and other assets	1,384	1,700
Intangible assets, net	227	234
Goodwill	0	0
Deferred income taxes	672	817
Total assets	125,834	101,205
Current liabilities
Short-term borrowings	0	0
Accounts payable and other	718	2,742
Accounts payable to affiliates	1,158	946
Interest payable	273	283
Short-term loans payable to affiliates	430	426
Current portion of long-term debt	2,466	1,853
Total current liabilities	5,045	6,250
Long-term debt	23,545	22,893
Other long-term liabilities	2,063	2,428
Long-term loans payable to affiliates	25,776	76
Deferred income taxes	0	0
Total liabilities	56,429	31,647
Equity
Controlling interests	69,405	69,558
Noncontrolling interests	0	0
Total equity	69,405	69,558
Total liabilities and equity	125,834	101,205
Subsidiary Non-Guarantors | Reportable Legal Entities
Current assets
Cash and cash equivalents	667	502
Restricted cash	50	110
Accounts receivable and other	6,100	6,211
Accounts receivable from affiliates	334	(142)
Short-term loans receivable from affiliates	6,225	653
Inventory	1,284	1,339
Total current assets	14,660	8,673
Property, plant and equipment, net	93,041	94,400
Long-term loans receivable from affiliates	25,830	1,344
Long-term investments	14,762	15,567
Long-term investments	14,517	14,841
Restricted long-term investments	389	323
Deferred amounts and other assets	9,421	8,558
Intangible assets, net	1,988	2,138
Goodwill	33,342	34,459
Deferred income taxes	532	229
Total assets	208,482	180,532
Current liabilities
Short-term borrowings	916	1,024
Accounts payable and other	6,240	7,086
Accounts payable to affiliates	(1,427)	(677)
Interest payable	232	225
Short-term loans payable to affiliates	7,941	7,177
Current portion of long-term debt	1,003	723
Total current liabilities	14,905	15,558
Long-term debt	27,540	23,215
Other long-term liabilities	8,024	8,100
Long-term loans payable to affiliates	39,443	12,696
Deferred income taxes	5,120	13,523
Total liabilities	95,032	73,092
Equity
Controlling interests	113,450	107,440
Noncontrolling interests	0	0
Total equity	113,450	107,440
Total liabilities and equity	208,482	180,532
Spectra Energy Partners L P | Subsidiary Issuer and Guarantor - SEP and EEP | Reportable Legal Entities
Current assets
Cash and cash equivalents	14	16
Restricted cash	0	0
Accounts receivable and other	2	15
Accounts receivable from affiliates	0	0
Short-term loans receivable from affiliates	0	0
Inventory	0	0
Total current assets	16	31
Property, plant and equipment, net	0	0
Long-term loans receivable from affiliates	73	73
Long-term investments	19,932	19,777
Long-term investments	927	987
Restricted long-term investments	0	0
Deferred amounts and other assets	0	9
Intangible assets, net	0	0
Goodwill	0	0
Deferred income taxes	0	0
Total assets	20,948	20,877
Current liabilities
Short-term borrowings	0	0
Accounts payable and other	52	7
Accounts payable to affiliates	819	233
Interest payable	53	56
Short-term loans payable to affiliates	3,113	682
Current portion of long-term debt	522	0
Total current liabilities	4,559	978
Long-term debt	4,465	7,276
Other long-term liabilities	20	2
Long-term loans payable to affiliates	0	0
Deferred income taxes	282	331
Total liabilities	9,326	8,587
Equity
Controlling interests	11,622	12,290
Noncontrolling interests	0	0
Total equity	11,622	12,290
Total liabilities and equity	20,948	20,877
Enbridge Energy Partners, L.P. | Subsidiary Issuer and Guarantor - SEP and EEP | Reportable Legal Entities
Current assets
Cash and cash equivalents	27	0
Restricted cash	0	0
Accounts receivable and other	2	8
Accounts receivable from affiliates	13	13
Short-term loans receivable from affiliates	4,523	3,689
Inventory	0	0
Total current assets	4,565	3,710
Property, plant and equipment, net	0	0
Long-term loans receivable from affiliates	2,418	2,539
Long-term investments	6,009	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	12,996	12,629
Current liabilities
Short-term borrowings	0	0
Accounts payable and other	5	34
Accounts payable to affiliates	524	56
Interest payable	68	105
Short-term loans payable to affiliates	2,681	0
Current portion of long-term debt	653	683
Total current liabilities	3,931	878
Long-term debt	4,467	6,943
Other long-term liabilities	21	30
Long-term loans payable to affiliates	1,437	1,502
Deferred income taxes	0	0
Total liabilities	9,856	9,353
Equity
Controlling interests	3,140	3,276
Noncontrolling interests	0	0
Total equity	3,140	3,276
Total liabilities and equity	$ 12,996	$ 12,629