CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - CAD ($) $ in Millions	Total	Preferred share investment	Common shares	Additional paid-in capital	Retained earnings/(deficit)	Accumulated other comprehensive income	Reciprocal shareholding	Total Enbridge Inc. shareholders' equity	Noncontrolling interests
Balance at Dec. 31, 2016		$ 7,255	$ 10,492	$ 3,399	$ (716)	$ 1,058	$ (102)		$ 577
Increase (Decrease) in Stockholders' Equity
Common shares issued in Merger Transaction			37,429
Dividend Reinvestment and Share Purchase Plan			889
Options exercised			58	(70)
Stock-based compensation				70
Fair value of outstanding earned stock-based compensation from Merger Transaction				77
Enbridge Energy Company, Inc. common control transaction				78					(331)
Dilution loss on Enbridge Energy Partners, L.P. issuance of Class A units				(522)					832
Dilution gain on Spectra Energy Partners, LP restructuring (Note 10)				0
Dilution gains/(losses) and other				62
Sale of noncontrolling interests in subsidiaries (Note 10)				0					0
Earnings attributable to controlling interests	$ 2,568				2,568
Preference share dividends					(246)
Common share dividends declared					(2,552)
Dividends paid to reciprocal shareholder					22
Redemption value adjustment attributable to redeemable noncontrolling interests					232
Adjustment for the recognition of unutilized tax deductions for stock-based compensation expense					41
Other comprehensive income/(loss) attributable to common shareholders, net of tax						(2,009)
Earnings attributable to noncontrolling interests									452
Change in unrealized gain/(loss) on cash flow hedges									(13)
Foreign currency translation adjustments									(446)
Reclassification to earnings of loss on cash flow hedges									29
Other comprehensive income/(loss) attributable to noncontrolling interests, net of tax									(430)
Comprehensive income attributable to noncontrolling interests									22
Noncontrolling interests resulting from Merger Transaction									8,877
Spectra Energy Partners, LP restructuring (Note 10)									0
Distributions									(634)
Contributions									498
Deconsolidation of Sabal Trail Transmission, LLC									(2,318)
Disposition of Olympic Pipeline									(24)
Other									(16)
Balance at Sep. 30, 2017	$ 64,996	7,255	48,868	3,094	(651)	(951)	(102)	$ 57,513	7,483
Increase (Decrease) in Stockholders' Equity
Dividends paid per common share (in Canadian dollars per share)	$ 1.803
Modified retrospective adoption of accounting standard (Note 2)					0
Balance at Dec. 31, 2017	$ 65,732	7,747	50,737	3,194	(2,468)	(973)	(102)		7,597
Increase (Decrease) in Stockholders' Equity
Common shares issued in Merger Transaction			0
Dividend Reinvestment and Share Purchase Plan			1,181
Options exercised			26	(14)
Stock-based compensation				40
Fair value of outstanding earned stock-based compensation from Merger Transaction				0
Enbridge Energy Company, Inc. common control transaction				0					0
Dilution loss on Enbridge Energy Partners, L.P. issuance of Class A units				0					0
Dilution gain on Spectra Energy Partners, LP restructuring (Note 10)				1,136
Dilution gains/(losses) and other				(89)
Sale of noncontrolling interests in subsidiaries (Note 10)				79					(1,183)
Earnings attributable to controlling interests	1,698				1,698
Preference share dividends					(272)
Common share dividends declared					(2,297)
Dividends paid to reciprocal shareholder					25
Redemption value adjustment attributable to redeemable noncontrolling interests					(318)
Adjustment for the recognition of unutilized tax deductions for stock-based compensation expense					0
Other comprehensive income/(loss) attributable to common shareholders, net of tax						1,543
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 attributable to noncontrolling interests									419
Noncontrolling interests resulting from Merger Transaction									0
Spectra Energy Partners, LP restructuring (Note 10)									(1,486)
Distributions									(637)
Contributions									23
Deconsolidation of Sabal Trail Transmission, LLC									0
Disposition of Olympic Pipeline									0
Other									12
Balance 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
Modified retrospective adoption of accounting standard (Note 2)					$ (86)