CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - CAD ($) $ in Millions	Total	Preference shares (Note 21)	Common Shares	Additional paid-in capital	Deficit	Deficit Modified retrospective adoption of ASC	Accumulated other comprehensive income/(loss) (Note 23)	Reciprocal shareholding (Note 13)	Total Enbridge Inc. shareholders’ equity	Noncontrolling interests (Note 20)
Balance at beginning of year at Dec. 31, 2017		$ 7,747	$ 50,737	$ 3,194	$ (2,468)	$ (86)	$ (973)	$ (102)		$ 7,597
Increase (Decrease) in Stockholders' Equity
Shares issued on Sponsored Vehicles buy-in			12,727
Dividend Reinvestment and Share Purchase Plan			1,181
Shares issued on exercise of stock options			32	(24)
Stock-based compensation				49
Sponsored Vehicles buy-in (Note 20)				(4,323)
Repurchase of noncontrolling interest				0
Dilution gain on Spectra Energy Partners, LP restructuring (Note 20)				1,136
Change in reciprocal interest				47
Other				(158)
Sale of noncontrolling interests in subsidiaries				79						1,183
Earnings attributable to controlling interests	$ 2,882				2,882
Preference share dividends					(367)
Common share dividends declared					(5,019)
Dividends paid to reciprocal shareholder					33
Redemption value adjustment to redeemable noncontrolling interests					(456)					(210)
Other					(57)		0
Impact of Sponsored Vehicles buy-in							(142)
Other comprehensive income/(loss) attributable to common shareholders, net of tax							3,787
Change in reciprocal interest								14
Earnings attributable to noncontrolling interests										334
Change in unrealized gain/(loss) on cash flow hedges										31
Foreign currency translation adjustments										294
Reclassification to earnings of loss on cash flow hedges										4
Other comprehensive income/(loss) attributable to noncontrolling interests, net of tax										329
Comprehensive income/(loss) attributable to noncontrolling interests										663
Distributions										(857)
Contributions										24
Spectra Energy Partners, LP restructuring (Note 20)										(1,486)
Change in noncontrolling interests on Sponsored Vehicles buy-in (Note 20)										(2,867)
Repurchase of noncontrolling interest										0
Dilution gain and other										(82)
Balance at end of year at Dec. 31, 2018	$ 73,435	7,747	64,677	0	(5,538)		2,672	(88)	$ 69,470	3,965
Increase (Decrease) in Stockholders' Equity
Dividends paid per common share (in CAD per share)	$ 2.68
Shares issued on Sponsored Vehicles buy-in			0
Dividend Reinvestment and Share Purchase Plan			0
Shares issued on exercise of stock options			69	(61)
Stock-based compensation				34
Sponsored Vehicles buy-in (Note 20)				0
Repurchase of noncontrolling interest				65
Dilution gain on Spectra Energy Partners, LP restructuring (Note 20)				0
Change in reciprocal interest				117
Other				32
Sale of noncontrolling interests in subsidiaries				0						0
Earnings attributable to controlling interests	$ 5,705				5,705
Preference share dividends					(383)
Common share dividends declared					(6,125)
Dividends paid to reciprocal shareholder					18
Redemption value adjustment to redeemable noncontrolling interests					0					(300)
Other					9		48
Impact of Sponsored Vehicles buy-in							0
Other comprehensive income/(loss) attributable to common shareholders, net of tax							(2,992)
Change in reciprocal interest								37
Earnings attributable to noncontrolling interests										122
Change in unrealized gain/(loss) on cash flow hedges										(7)
Foreign currency translation adjustments										(108)
Reclassification to earnings of loss on cash flow hedges										0
Other comprehensive income/(loss) attributable to noncontrolling interests, net of tax										(115)
Comprehensive income/(loss) attributable to noncontrolling interests										7
Distributions										(254)
Contributions										12
Spectra Energy Partners, LP restructuring (Note 20)										0
Change in noncontrolling interests on Sponsored Vehicles buy-in (Note 20)										0
Repurchase of noncontrolling interest	(300)									(65)
Dilution gain and other										(1)
Balance at end of year at Dec. 31, 2019	$ 69,407	7,747	64,746	187	(6,314)	$ (66)	(272)	(51)	66,043	3,364
Increase (Decrease) in Stockholders' Equity
Dividends paid per common share (in CAD per share)	$ 2.95
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201613Member
Shares issued on Sponsored Vehicles buy-in			0
Dividend Reinvestment and Share Purchase Plan			0
Shares issued on exercise of stock options			22	(21)
Stock-based compensation				30
Sponsored Vehicles buy-in (Note 20)				0
Repurchase of noncontrolling interest				0
Dilution gain on Spectra Energy Partners, LP restructuring (Note 20)				0
Change in reciprocal interest				76
Other				5
Sale of noncontrolling interests in subsidiaries				0						0
Earnings attributable to controlling interests	$ 3,363				3,363
Preference share dividends					(380)
Common share dividends declared					(6,612)
Dividends paid to reciprocal shareholder					17
Redemption value adjustment to redeemable noncontrolling interests					0					(112)
Other					(3)		0
Impact of Sponsored Vehicles buy-in							0
Other comprehensive income/(loss) attributable to common shareholders, net of tax							(1,129)
Change in reciprocal interest								22
Earnings attributable to noncontrolling interests										53
Change in unrealized gain/(loss) on cash flow hedges										(6)
Foreign currency translation adjustments										(25)
Reclassification to earnings of loss on cash flow hedges										0
Other comprehensive income/(loss) attributable to noncontrolling interests, net of tax										(31)
Comprehensive income/(loss) attributable to noncontrolling interests										22
Distributions										(300)
Contributions										23
Spectra Energy Partners, LP restructuring (Note 20)										0
Change in noncontrolling interests on Sponsored Vehicles buy-in (Note 20)										0
Repurchase of noncontrolling interest	(112)									0
Dilution gain and other										(1)
Balance at end of year at Dec. 31, 2020	$ 64,363	$ 7,747	$ 64,768	$ 277	$ (9,995)		$ (1,401)	$ (29)	$ 61,367	$ 2,996
Increase (Decrease) in Stockholders' Equity
Dividends paid per common share (in CAD per share)	$ 3.24