CONDENSED CONSOLIDATING FINANCIAL INFORMATION - Statement of Financial Position (Details) - CAD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018
Current assets
Cash and cash equivalents	$ 702	$ 518
Restricted cash	55	119
Accounts receivable and other	6,486	6,517
Accounts receivable from affiliates	92	79
Short-term loans receivable from affiliates	0	0
Inventory	1,047	1,339
Total current assets	8,382	8,572
Property, plant and equipment, net	93,875	94,540
Long-term loans receivable from affiliates	0	0
Long-term investments	0	0
Long-term investments	16,902	16,707
Restricted long-term investments	356	323
Deferred amounts and other assets	9,505	8,558
Intangible assets, net	2,301	2,372
Goodwill	33,895	34,459
Deferred income taxes	1,292	1,374
Total assets	166,508	166,905
Current liabilities
Short-term borrowings	870	1,024
Accounts payable and other	7,331	9,863
Accounts payable to affiliates	30	40
Interest payable	573	669
Short-term loans payable to affiliates	0	0
Current portion of long-term debt	4,321	3,259
Total current liabilities	13,125	14,855
Long-term debt	60,680	60,327
Other long-term liabilities	9,044	8,834
Long-term loans payable to affiliates	0	0
Deferred income taxes	9,740	9,454
Total liabilities	92,589	93,470
Equity
Controlling interests	70,305	69,470
Noncontrolling interests	3,614	3,965
Total equity	73,919	73,435	$ 67,514
Total liabilities and equity	166,508	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	(604)	(518)
Short-term loans receivable from affiliates	(13,236)	(8,285)
Inventory	0	0
Total current assets	(13,840)	(8,803)
Property, plant and equipment, net	0	0
Long-term loans receivable from affiliates	(44,573)	(14,274)
Long-term investments	(119,253)	(120,181)
Long-term investments	(3,568)	(3,682)
Restricted long-term investments	0	0
Deferred amounts and other assets	(1,407)	(1,726)
Intangible assets, net	0	0
Goodwill	0	0
Deferred income taxes	328	328
Total assets	(182,313)	(148,338)
Current liabilities
Short-term borrowings	0	0
Accounts payable and other	(10)	(6)
Accounts payable to affiliates	(603)	(518)
Interest payable	0	0
Short-term loans payable to affiliates	(13,236)	(8,285)
Current portion of long-term debt	0	0
Total current liabilities	(13,849)	(8,809)
Long-term debt	0	0
Other long-term liabilities	(1,407)	(1,726)
Long-term loans payable to affiliates	(44,573)	(14,274)
Deferred income taxes	(4,385)	(4,400)
Total liabilities	(64,214)	(29,209)
Equity
Controlling interests	(121,713)	(123,094)
Noncontrolling interests	3,614	3,965
Total equity	(118,099)	(119,129)
Total liabilities and equity	(182,313)	(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	283	283
Accounts receivable from affiliates	586	726
Short-term loans receivable from affiliates	3,527	3,943
Inventory	0	0
Total current assets	4,405	4,961
Property, plant and equipment, net	166	140
Long-term loans receivable from affiliates	26,504	10,318
Long-term investments	78,271	78,474
Long-term investments	4,619	4,561
Restricted long-term investments	0	0
Deferred amounts and other assets	1,491	1,700
Intangible assets, net	219	234
Goodwill	0	0
Deferred income taxes	744	817
Total assets	116,419	101,205
Current liabilities
Short-term borrowings	0	0
Accounts payable and other	756	2,742
Accounts payable to affiliates	935	946
Interest payable	227	283
Short-term loans payable to affiliates	426	426
Current portion of long-term debt	2,979	1,853
Total current liabilities	5,323	6,250
Long-term debt	23,519	22,893
Other long-term liabilities	2,145	2,428
Long-term loans payable to affiliates	15,076	76
Deferred income taxes	0	0
Total liabilities	46,063	31,647
Equity
Controlling interests	70,356	69,558
Noncontrolling interests	0	0
Total equity	70,356	69,558
Total liabilities and equity	116,419	101,205
Subsidiary Non-Guarantors | Reportable Legal Entities
Current assets
Cash and cash equivalents	690	502
Restricted cash	46	110
Accounts receivable and other	6,202	6,211
Accounts receivable from affiliates	79	(142)
Short-term loans receivable from affiliates	5,871	653
Inventory	1,047	1,339
Total current assets	13,935	8,673
Property, plant and equipment, net	93,709	94,400
Long-term loans receivable from affiliates	15,524	1,344
Long-term investments	15,032	15,567
Long-term investments	14,890	14,841
Restricted long-term investments	356	323
Deferred amounts and other assets	9,412	8,558
Intangible assets, net	2,082	2,138
Goodwill	33,895	34,459
Deferred income taxes	220	229
Total assets	199,055	180,532
Current liabilities
Short-term borrowings	870	1,024
Accounts payable and other	6,552	7,086
Accounts payable to affiliates	(891)	(677)
Interest payable	229	225
Short-term loans payable to affiliates	7,367	7,177
Current portion of long-term debt	674	723
Total current liabilities	14,801	15,558
Long-term debt	27,501	23,215
Other long-term liabilities	8,276	8,100
Long-term loans payable to affiliates	28,027	12,696
Deferred income taxes	13,821	13,523
Total liabilities	92,426	73,092
Equity
Controlling interests	106,629	107,440
Noncontrolling interests	0	0
Total equity	106,629	107,440
Total liabilities and equity	199,055	180,532
Spectra Energy Partners L P | Subsidiary Issuer and Guarantor - SEP and EEP | Reportable Legal Entities
Current assets
Cash and cash equivalents	5	16
Restricted cash	0	0
Accounts receivable and other	1	15
Accounts receivable from affiliates	0	0
Short-term loans receivable from affiliates	0	0
Inventory	0	0
Total current assets	6	31
Property, plant and equipment, net	0	0
Long-term loans receivable from affiliates	73	73
Long-term investments	19,741	19,777
Long-term investments	961	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	20,782	20,877
Current liabilities
Short-term borrowings	0	0
Accounts payable and other	19	7
Accounts payable to affiliates	509	233
Interest payable	25	56
Short-term loans payable to affiliates	2,985	682
Current portion of long-term debt	0	0
Total current liabilities	3,538	978
Long-term debt	5,095	7,276
Other long-term liabilities	8	2
Long-term loans payable to affiliates	0	0
Deferred income taxes	304	331
Total liabilities	8,945	8,587
Equity
Controlling interests	11,837	12,290
Noncontrolling interests	0	0
Total equity	11,837	12,290
Total liabilities and equity	20,782	20,877
Enbridge Energy Partners, L.P. | Subsidiary Issuer and Guarantor - SEP and EEP | Reportable Legal Entities
Current assets
Cash and cash equivalents	7	0
Restricted cash	0	0
Accounts receivable and other	0	8
Accounts receivable from affiliates	31	13
Short-term loans receivable from affiliates	3,838	3,689
Inventory	0	0
Total current assets	3,876	3,710
Property, plant and equipment, net	0	0
Long-term loans receivable from affiliates	2,472	2,539
Long-term investments	6,209	6,363
Long-term investments	0	0
Restricted long-term investments	0	0
Deferred amounts and other assets	8	17
Intangible assets, net	0	0
Goodwill	0	0
Deferred income taxes	0	0
Total assets	12,565	12,629
Current liabilities
Short-term borrowings	0	0
Accounts payable and other	14	34
Accounts payable to affiliates	80	56
Interest payable	92	105
Short-term loans payable to affiliates	2,458	0
Current portion of long-term debt	668	683
Total current liabilities	3,312	878
Long-term debt	4,565	6,943
Other long-term liabilities	22	30
Long-term loans payable to affiliates	1,470	1,502
Deferred income taxes	0	0
Total liabilities	9,369	9,353
Equity
Controlling interests	3,196	3,276
Noncontrolling interests	0	0
Total equity	3,196	3,276
Total liabilities and equity	$ 12,565	$ 12,629