CONDENSED CONSOLIDATING FINANCIAL INFORMATION - Statement of Earnings and Comprehensive Income (Details) - CAD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Operating revenues
Revenues	$ 12,856	$ 12,726
Operating expenses
Operating and administrative	1,625	1,641
Depreciation and amortization	840	824
Impairment of long-lived assets	0	1,062
Total operating expenses	10,237	11,848
Operating income	2,619	878
Income from equity investments	413	335
Equity earnings from consolidated subsidiaries	0	0
Other
Net foreign currency gain/(loss)	214	(185)
Other	46	65
Interest expense	(685)	(656)
Earnings before income taxes	2,607	437
Income tax recovery/(expense)	(584)	73
Earnings	2,023	510
(Earnings)/loss attributable to noncontrolling interests and redeemable noncontrolling interests	(37)	24
Earnings attributable to controlling interests	1,986	534
Preference share dividends	(95)	(89)
Earnings attributable to common shareholders	1,891	445
Total other comprehensive income/(loss)	(1,328)	1,473
Comprehensive income	695	1,983
Comprehensive (income)/loss attributable to noncontrolling interests and redeemable noncontrolling interests	13	(147)
Comprehensive income attributable to controlling interests	708	1,836
Consolidation, Eliminations
Operating revenues
Revenues	0	0
Operating expenses
Operating and administrative	0	0
Depreciation and amortization	0	0
Impairment of long-lived assets		0
Total operating expenses	0	0
Operating income	0	0
Income from equity investments	(59)	(16)
Equity earnings from consolidated subsidiaries	(1,928)	(2,069)
Other
Net foreign currency gain/(loss)	(904)	70
Other	(448)	(251)
Interest expense	458	274
Earnings before income taxes	(2,881)	(1,992)
Income tax recovery/(expense)	106	9
Earnings	(2,775)	(1,983)
(Earnings)/loss attributable to noncontrolling interests and redeemable noncontrolling interests	(37)	24
Earnings attributable to controlling interests	(2,812)	(1,959)
Preference share dividends	0	0
Earnings attributable to common shareholders	(2,812)	(1,959)
Total other comprehensive income/(loss)	671	(109)
Comprehensive income	(2,104)	(2,092)
Comprehensive (income)/loss attributable to noncontrolling interests and redeemable noncontrolling interests	13	(147)
Comprehensive income attributable to controlling interests	(2,091)	(2,239)
Parent Issuer and Guarantor | Reportable Legal Entities
Operating revenues
Revenues	0	0
Operating expenses
Operating and administrative	(34)	67
Depreciation and amortization	15	14
Impairment of long-lived assets		0
Total operating expenses	(19)	81
Operating income	19	(81)
Income from equity investments	59	17
Equity earnings from consolidated subsidiaries	774	707
Other
Net foreign currency gain/(loss)	1,221	(199)
Other	330	246
Interest expense	(308)	(243)
Earnings before income taxes	2,095	447
Income tax recovery/(expense)	(109)	87
Earnings	1,986	534
(Earnings)/loss attributable to noncontrolling interests and redeemable noncontrolling interests	0	0
Earnings attributable to controlling interests	1,986	534
Preference share dividends	(95)	(89)
Earnings attributable to common shareholders	1,891	445
Total other comprehensive income/(loss)	(1,278)	1,302
Comprehensive income	708	1,836
Comprehensive (income)/loss attributable to noncontrolling interests and redeemable noncontrolling interests	0	0
Comprehensive income attributable to controlling interests	708	1,836
Subsidiary Non-Guarantors | Reportable Legal Entities
Operating revenues
Revenues	12,856	12,726
Operating expenses
Operating and administrative	1,656	1,569
Depreciation and amortization	825	810
Impairment of long-lived assets		1,062
Total operating expenses	10,253	11,762
Operating income	2,603	964
Income from equity investments	382	300
Equity earnings from consolidated subsidiaries	493	608
Other
Net foreign currency gain/(loss)	(103)	(58)
Other	123	39
Interest expense	(583)	(479)
Earnings before income taxes	2,915	1,374
Income tax recovery/(expense)	(596)	(23)
Earnings	2,319	1,351
(Earnings)/loss attributable to noncontrolling interests and redeemable noncontrolling interests	0	0
Earnings attributable to controlling interests	2,319	1,351
Preference share dividends	0	0
Earnings attributable to common shareholders	2,319	1,351
Total other comprehensive income/(loss)	(720)	253
Comprehensive income	1,599	1,604
Comprehensive (income)/loss attributable to noncontrolling interests and redeemable noncontrolling interests	0	0
Comprehensive income attributable to controlling interests	1,599	1,604
Spectra Energy Partners L P | Subsidiary Issuer and Guarantor - SEP and EEP | Reportable Legal Entities
Operating revenues
Revenues	0	0
Operating expenses
Operating and administrative	2	1
Depreciation and amortization	0	0
Impairment of long-lived assets		0
Total operating expenses	2	1
Operating income	(2)	(1)
Income from equity investments	31	34
Equity earnings from consolidated subsidiaries	398	551
Other
Net foreign currency gain/(loss)	0	2
Other	0	1
Interest expense	(94)	(72)
Earnings before income taxes	333	515
Income tax recovery/(expense)	15	0
Earnings	348	515
(Earnings)/loss attributable to noncontrolling interests and redeemable noncontrolling interests	0	0
Earnings attributable to controlling interests	348	515
Preference share dividends	0	0
Earnings attributable to common shareholders	348	515
Total other comprehensive income/(loss)	(16)	19
Comprehensive income	332	534
Comprehensive (income)/loss attributable to noncontrolling interests and redeemable noncontrolling interests	0	0
Comprehensive income attributable to controlling interests	332	534
Enbridge Energy Partners, L.P. | Subsidiary Issuer and Guarantor - SEP and EEP | Reportable Legal Entities
Operating revenues
Revenues	0	0
Operating expenses
Operating and administrative	1	4
Depreciation and amortization	0	0
Impairment of long-lived assets		0
Total operating expenses	1	4
Operating income	(1)	(4)
Income from equity investments	0	0
Equity earnings from consolidated subsidiaries	263	203
Other
Net foreign currency gain/(loss)	0	0
Other	41	30
Interest expense	(158)	(136)
Earnings before income taxes	145	93
Income tax recovery/(expense)	0	0
Earnings	145	93
(Earnings)/loss attributable to noncontrolling interests and redeemable noncontrolling interests	0	0
Earnings attributable to controlling interests	145	93
Preference share dividends	0	0
Earnings attributable to common shareholders	145	93
Total other comprehensive income/(loss)	15	8
Comprehensive income	160	101
Comprehensive (income)/loss attributable to noncontrolling interests and redeemable noncontrolling interests	0	0
Comprehensive income attributable to controlling interests	160	101
Commodity
Operating revenues
Revenues	6,632	7,268
Operating expenses
Cost of goods and services sold	6,565	6,997
Commodity | Consolidation, Eliminations
Operating revenues
Revenues	0	0
Operating expenses
Cost of goods and services sold	0	0
Commodity | Parent Issuer and Guarantor | Reportable Legal Entities
Operating revenues
Revenues	0	0
Operating expenses
Cost of goods and services sold	0	0
Commodity | Subsidiary Non-Guarantors | Reportable Legal Entities
Operating revenues
Revenues	6,632	7,268
Operating expenses
Cost of goods and services sold	6,565	6,997
Commodity | Spectra Energy Partners L P | Subsidiary Issuer and Guarantor - SEP and EEP | Reportable Legal Entities
Operating revenues
Revenues	0	0
Operating expenses
Cost of goods and services sold	0	0
Commodity | Enbridge Energy Partners, L.P. | Subsidiary Issuer and Guarantor - SEP and EEP | Reportable Legal Entities
Operating revenues
Revenues	0	0
Operating expenses
Cost of goods and services sold	0	0
Gas Distribution
Operating revenues
Revenues	1,876	1,926
Operating expenses
Cost of goods and services sold	1,207	1,324
Gas Distribution | Consolidation, Eliminations
Operating revenues
Revenues	0	0
Operating expenses
Cost of goods and services sold	0	0
Gas Distribution | Parent Issuer and Guarantor | Reportable Legal Entities
Operating revenues
Revenues	0	0
Operating expenses
Cost of goods and services sold	0	0
Gas Distribution | Subsidiary Non-Guarantors | Reportable Legal Entities
Operating revenues
Revenues	1,876	1,926
Operating expenses
Cost of goods and services sold	1,207	1,324
Gas Distribution | Spectra Energy Partners L P | Subsidiary Issuer and Guarantor - SEP and EEP | Reportable Legal Entities
Operating revenues
Revenues	0	0
Operating expenses
Cost of goods and services sold	0	0
Gas Distribution | Enbridge Energy Partners, L.P. | Subsidiary Issuer and Guarantor - SEP and EEP | Reportable Legal Entities
Operating revenues
Revenues	0	0
Operating expenses
Cost of goods and services sold	0	0
Transportation and other services
Operating revenues
Revenues	4,348	3,532
Transportation and other services | Consolidation, Eliminations
Operating revenues
Revenues	0	0
Transportation and other services | Parent Issuer and Guarantor | Reportable Legal Entities
Operating revenues
Revenues	0	0
Transportation and other services | Subsidiary Non-Guarantors | Reportable Legal Entities
Operating revenues
Revenues	4,348	3,532
Transportation and other services | Spectra Energy Partners L P | Subsidiary Issuer and Guarantor - SEP and EEP | Reportable Legal Entities
Operating revenues
Revenues	0	0
Transportation and other services | Enbridge Energy Partners, L.P. | Subsidiary Issuer and Guarantor - SEP and EEP | Reportable Legal Entities
Operating revenues
Revenues	$ 0	$ 0