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 Interest	Merger Transaction Common Shares
Balance at Dec. 31, 2016		$ 7,255	$ 10,492	$ 3,399	$ (716)	$ 1,058	$ (102)		$ 577
Increase (Decrease) in Stockholders' Equity
Shares issued		492	1,500
Common shares issued in Merger Transaction			0							$ 37,429
Dividend Reinvestment and Share Purchase Plan			1,226
Exercise of stock options			90	(95)
Stock-based compensation				82
Sponsored Vehicles buy-in				0
Repurchase of noncontrolling interest				0					8,955
Dilution gain on Spectra Energy Partners, LP restructuring (Note 20)				0
Change in reciprocal interest				0
Other				(192)
Sale of noncontrolling interests in subsidiaries				0					0
Earnings attributable to controlling interests	$ 2,859				2,859
Preference share dividends					(330)
Common share dividends declared					(4,702)
Dividends paid to reciprocal shareholder					30
Redemption value adjustment to redeemable noncontrolling interests (Note 20)	(292)				292				0
Other					99	0
Impact of Sponsored Vehicles buy-in						0
Other comprehensive income/(loss) attributable to common shareholders, net of tax						(2,031)
Change in reciprocal interest							0
Earnings attributable to noncontrolling interests									232
Change in unrealized gain/(loss) on cash flow hedges									15
Foreign currency translation adjustments									(431)
Reclassification to earnings of loss on cash flow hedges									139
Other comprehensive income/(loss) attributable to noncontrolling interests, net of tax									(277)
Comprehensive income/(loss) attributable to noncontrolling interests									(45)
Enbridge Energy Company, Inc. common control transaction									(343)
Distributions									(839)
Contributions									832
Deconsolidation of Sabal Trail Transmission, LLC									(2,318)
Spectra Energy Partners, LP restructuring (Note 20)									0
Change in noncontrolling interests on Sponsored Vehicles buy-in									0
Repurchase of noncontrolling interest	0								0
Dilution gain and other									778
Balance at Dec. 31, 2017	$ 65,732	7,747	50,737	3,194	(2,468)	(973)	(102)	$ 58,135	7,597
Increase (Decrease) in Stockholders' Equity
Dividends paid per common share (in CAD per share)	$ 2.41
Modified retrospective adoption of ASC 606 Revenue from Contracts with Customers	$ 0				0
Shares issued		0	0
Common shares issued in Merger Transaction			12,727							0
Dividend Reinvestment and Share Purchase Plan			1,181
Exercise of stock options			32	(24)
Stock-based compensation				49
Sponsored Vehicles buy-in				(4,323)
Repurchase of noncontrolling interest				0					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 (Note 20)	456				(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
Enbridge Energy Company, Inc. common control transaction									0
Distributions									(857)
Contributions									24
Deconsolidation of Sabal Trail Transmission, LLC									0
Spectra Energy Partners, LP restructuring (Note 20)									(1,486)
Change in noncontrolling interests on Sponsored Vehicles buy-in									(2,867)
Repurchase of noncontrolling interest	(4,469)								0
Dilution gain and other									(82)
Balance 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
Modified retrospective adoption of ASC 606 Revenue from Contracts with Customers	$ (38)				(86)
Shares issued		0	0
Common shares issued in Merger Transaction			0							$ 0
Dividend Reinvestment and Share Purchase Plan			0
Exercise of stock options			69	(61)
Stock-based compensation				34
Sponsored Vehicles buy-in				0
Repurchase of noncontrolling interest				65					0
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 (Note 20)					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
Enbridge Energy Company, Inc. common control transaction									0
Distributions									(254)
Contributions									12
Deconsolidation of Sabal Trail Transmission, LLC									0
Spectra Energy Partners, LP restructuring (Note 20)									0
Change in noncontrolling interests on Sponsored Vehicles buy-in									0
Repurchase of noncontrolling interest									(65)
Dilution gain and other									(1)
Balance at Dec. 31, 2019	$ 69,407	$ 7,747	$ 64,746	$ 187	(6,314)	$ (272)	$ (51)	$ 66,043	$ 3,364
Increase (Decrease) in Stockholders' Equity
Dividends paid per common share (in CAD per share)	$ 2.95
Modified retrospective adoption of ASC 606 Revenue from Contracts with Customers					$ 0