CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - CAD ($) $ in Millions	Total	Preference shares	Common shares	Additional paid-in capital	Retained earnings/(deficit)	Accumulated other comprehensive income/(loss)	Reciprocal shareholding	Total Enbridge Inc. shareholders' equity	Noncontrolling interests
Balance at the beginning of the period at Dec. 31, 2017		$ 7,747	$ 50,737	$ 3,194	$ (2,468)	$ (973)	$ (102)		$ 7,597
Increase (Decrease) in Stockholders' Equity
Dividend Reinvestment and Share Purchase Plan			1,181
Stock-based compensation				40
Options exercised			26	(14)
Dilution gain on Spectra Energy Partners, LP restructuring				1,136
Sale of noncontrolling interests in subsidiaries				79					1,183
Other				(89)
Earnings attributable to controlling interests	$ 1,698				1,698
Preference share dividends					(272)
Dividends paid to reciprocal shareholder					25
Common share dividends declared					(2,297)
Redemption value adjustment attributable to redeemable noncontrolling interests					(318)
Other comprehensive income/(loss) attributable to common shareholders, net of tax						1,543
Other									12
Earnings attributable to noncontrolling interests									248
Change in unrealized gain/(loss) on cash flow hedges									8
Foreign currency translation adjustments									140
Reclassification to earnings of loss on cash flow hedges									23
Other comprehensive income/(loss) attributable to noncontrolling interests, net of tax									171
Comprehensive income/(loss) attributable to noncontrolling interests									419
Spectra Energy Partners, LP restructuring									(1,486)
Contributions									23
Distributions									(637)
Balance at the end of the period at Sep. 30, 2018	$ 67,898	7,747	51,944	4,346	(3,718)	570	(102)	$ 60,787	7,111
Increase (Decrease) in Stockholders' Equity
Dividends paid per common share (in Canadian dollars per share)	$ 2.013
Earnings/(loss) per common share attributable to common shareholders (Note 5) (in Canadian dollars per share)	0.84
Diluted earnings/(loss) per common share attributable to common shareholders (Note 5) (in Canadian dollars per share)	$ 0.84
Balance at the beginning of the period at Jun. 30, 2018		7,747	51,548	4,311	(2,649)	1,277	(102)		6,100
Increase (Decrease) in Stockholders' Equity
Dividend Reinvestment and Share Purchase Plan			391
Stock-based compensation				6
Options exercised			5	(4)
Sale of noncontrolling interests in subsidiaries				79					1,183
Other				(46)
Earnings attributable to controlling interests	$ 4				4
Preference share dividends					(94)
Dividends paid to reciprocal shareholder					8
Common share dividends declared					(1,152)
Redemption value adjustment attributable to redeemable noncontrolling interests					165
Other comprehensive income/(loss) attributable to common shareholders, net of tax						(707)
Other									(2)
Earnings attributable to noncontrolling interests									119
Change in unrealized gain/(loss) on cash flow hedges									2
Foreign currency translation adjustments									(89)
Reclassification to earnings of loss on cash flow hedges									8
Other comprehensive income/(loss) attributable to noncontrolling interests, net of tax									(79)
Comprehensive income/(loss) attributable to noncontrolling interests									40
Contributions									2
Distributions									(212)
Balance at the end of the period at Sep. 30, 2018	$ 67,898	7,747	51,944	4,346	(3,718)	570	(102)	60,787	7,111
Increase (Decrease) in Stockholders' Equity
Dividends paid per common share (in Canadian dollars per share)	$ 0.671
Earnings/(loss) per common share attributable to common shareholders (Note 5) (in Canadian dollars per share)	(0.05)
Diluted earnings/(loss) per common share attributable to common shareholders (Note 5) (in Canadian dollars per share)	$ (0.05)
Balance at the beginning of the period at Dec. 31, 2018	$ 73,435	7,747	64,677		(5,538)	2,672	(88)		3,965
Increase (Decrease) in Stockholders' Equity
Stock-based compensation				28
Options exercised			58	(51)
Change in reciprocal interest				109
Repurchase of noncontrolling interest				65
Other				55
Earnings attributable to controlling interests	4,863				4,863
Preference share dividends					(287)
Dividends paid to reciprocal shareholder					14
Common share dividends declared					(2,993)
Other comprehensive income/(loss) attributable to common shareholders, net of tax						(2,138)
Other					9	48			(4)
Change in reciprocal interest							37
Earnings attributable to noncontrolling interests									50
Change in unrealized gain/(loss) on cash flow hedges									(6)
Foreign currency translation adjustments									(67)
Other comprehensive income/(loss) attributable to noncontrolling interests, net of tax									(73)
Comprehensive income/(loss) attributable to noncontrolling interests									(23)
Contributions									10
Distributions									(194)
Repurchase of noncontrolling interest									(65)
Redemption of preferred shares held by subsidiary (Note 10)									(300)
Balance at the end of the period at Sep. 30, 2019	$ 72,676	7,747	64,735	206	(3,932)	582	(51)	69,287	3,389
Increase (Decrease) in Stockholders' Equity
Dividends paid per common share (in Canadian dollars per share)	$ 2.214
Earnings/(loss) per common share attributable to common shareholders (Note 5) (in Canadian dollars per share)	2.27
Diluted earnings/(loss) per common share attributable to common shareholders (Note 5) (in Canadian dollars per share)	$ 2.27
Balance at the beginning of the period at Jun. 30, 2019		7,747	64,732	194	(3,392)	124	(51)		3,451
Increase (Decrease) in Stockholders' Equity
Stock-based compensation				7
Options exercised			3	(2)
Other				7
Earnings attributable to controlling interests	$ 1,045				1,045
Preference share dividends					(96)
Dividends paid to reciprocal shareholder					5
Common share dividends declared					(1,493)
Other comprehensive income/(loss) attributable to common shareholders, net of tax						465
Other					(1)	(7)			(10)
Earnings attributable to noncontrolling interests									15
Change in unrealized gain/(loss) on cash flow hedges									(1)
Foreign currency translation adjustments									27
Other comprehensive income/(loss) attributable to noncontrolling interests, net of tax									26
Comprehensive income/(loss) attributable to noncontrolling interests									41
Contributions									1
Distributions									(94)
Balance at the end of the period at Sep. 30, 2019	$ 72,676	$ 7,747	$ 64,735	$ 206	$ (3,932)	$ 582	$ (51)	$ 69,287	$ 3,389
Increase (Decrease) in Stockholders' Equity
Dividends paid per common share (in Canadian dollars per share)	$ 0.738
Earnings/(loss) per common share attributable to common shareholders (Note 5) (in Canadian dollars per share)	0.47
Diluted earnings/(loss) per common share attributable to common shareholders (Note 5) (in Canadian dollars per share)	$ 0.47