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			538
Options exercised			45	(53)
Stock-based compensation				51
Fair value of outstanding earned stock-based compensation from Merger Transaction				77
Enbridge Energy Company, Inc. common control transaction				118					(331)
Dilution loss on Enbridge Energy Partners, L.P. issuance of Class A units				(870)					870
Dilution gain on Spectra Energy Partners, LP restructuring (Note 10)				0
Dilution gains/(losses) and other				357
Earnings attributable to controlling interests	$ 1,721				1,721
Preference share dividends					(164)
Common share dividends declared					(1,551)
Dividends paid to reciprocal shareholder					15
Redemption value adjustment attributable to redeemable noncontrolling interests					189
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						(650)
Earnings attributable to noncontrolling interests									371
Change in unrealized gain/(loss) on cash flow hedges									(19)
Foreign currency translation adjustments									(112)
Reclassification to earnings of loss on cash flow hedges									23
Other comprehensive income/(loss) attributable to noncontrolling interests, net of tax									(108)
Comprehensive income attributable to noncontrolling interests									263
Noncontrolling interests resulting from Merger Transaction									8,792
Spectra Energy Partners, LP restructuring (Note 10)									0
Distributions									(386)
Contributions									453
Other									13
Balance at Jun. 30, 2017	$ 68,930	7,255	48,504	3,079	(465)	408	(102)	$ 58,679	10,251
Increase (Decrease) in Stockholders' Equity
Dividends paid per common share (in Canadian dollars per share)	$ 1.193
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			790
Options exercised			21	(10)
Stock-based compensation				34
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				(43)
Earnings attributable to controlling interests	1,694				1,694
Preference share dividends					(178)
Common share dividends declared					(1,145)
Dividends paid to reciprocal shareholder					17
Redemption value adjustment attributable to redeemable noncontrolling interests					(483)
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						2,250
Earnings attributable to noncontrolling interests									129
Change in unrealized gain/(loss) on cash flow hedges									6
Foreign currency translation adjustments									229
Reclassification to earnings of loss on cash flow hedges									15
Other comprehensive income/(loss) attributable to noncontrolling interests, net of tax									250
Comprehensive income attributable to noncontrolling interests									379
Noncontrolling interests resulting from Merger Transaction									0
Spectra Energy Partners, LP restructuring (Note 10)									(1,486)
Distributions									(425)
Contributions									21
Other									14
Balance at Jun. 30, 2018	$ 68,232	$ 7,747	$ 51,548	$ 4,311	(2,649)	$ 1,277	$ (102)	$ 62,132	$ 6,100
Increase (Decrease) in Stockholders' Equity
Dividends paid per common share (in Canadian dollars per share)	$ 1.342
Modified retrospective adoption of accounting standard (Note 2)					$ (86)