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	Adjustment Retained earnings/(deficit)
Balance at the beginning of the period at Dec. 31, 2018		$ 7,747	$ 64,677	$ 0	$ (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			37
Repurchase of noncontrolling interest				65					(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					9	48			(4)
Other comprehensive income/(loss) attributable to common shareholders, net of tax						(2,138)
Earnings attributable to noncontrolling interests									50
Change in unrealized 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								(23)
Contributions									10
Distributions									(194)
Redemption of preferred shares held by subsidiary									(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 per common share attributable to common shareholders (in Canadian dollars per share)	2.27
Diluted earnings per common share attributable to common shareholders (in Canadian dollars per share)	$ 2.27
Balance at the beginning of the period at Dec. 31, 2018		7,747	64,677	0	(5,538)	2,672	(88)		3,965
Balance at the end of the period at Dec. 31, 2019	$ 69,407	7,747	64,746	187	(6,314)	(272)	(51)		3,364	$ (66)
Increase (Decrease) in Stockholders' Equity
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201613Member
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)
Change in reciprocal interest	$ 0						0
Repurchase of noncontrolling interest	0								0
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					(1)	(7)			(10)
Other comprehensive income/(loss) attributable to common shareholders, net of tax						465
Earnings attributable to noncontrolling interests									15
Change in unrealized 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)								41
Contributions									1
Distributions									(94)
Redemption of preferred shares held by subsidiary									0
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 per common share attributable to common shareholders (in Canadian dollars per share)	0.47
Diluted earnings per common share attributable to common shareholders (in Canadian dollars per share)	$ 0.47
Balance at the beginning of the period at Dec. 31, 2019	$ 69,407	7,747	64,746	187	(6,314)	(272)	(51)		3,364	(66)
Increase (Decrease) in Stockholders' Equity
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201613Member
Balance at the beginning of the period at Dec. 31, 2019	$ 69,407	7,747	64,746	187	(6,314)	(272)	(51)		3,364	(66)
Increase (Decrease) in Stockholders' Equity
Stock-based compensation				25
Options exercised			18	(19)
Change in reciprocal interest				66			22
Repurchase of noncontrolling interest				0					0
Other				6
Earnings attributable to controlling interests	1,492				1,492
Preference share dividends					(284)
Dividends paid to reciprocal shareholder					14
Common share dividends declared					(3,281)
Other					(3)	0			(1)
Other comprehensive income/(loss) attributable to common shareholders, net of tax						1,171
Earnings attributable to noncontrolling interests									25
Change in unrealized loss on cash flow hedges									(3)
Foreign currency translation adjustments									57
Other comprehensive income/(loss) attributable to noncontrolling interests, net of tax									54
Comprehensive income/(loss) attributable to noncontrolling interests	(79)								79
Contributions									21
Distributions									(232)
Redemption of preferred shares held by subsidiary									0
Balance at the end of the period at Sep. 30, 2020	$ 68,435	7,747	64,764	265	(8,442)	899	(29)	65,204	3,231
Increase (Decrease) in Stockholders' Equity
Dividends paid per common share (in Canadian dollars per share)	$ 2.430
Earnings per common share attributable to common shareholders (in Canadian dollars per share)	0.60
Diluted earnings per common share attributable to common shareholders (in Canadian dollars per share)	$ 0.60
Balance at the beginning of the period at Jun. 30, 2020		7,747	64,763	207	(7,797)	1,753	(47)		3,315	$ 0
Increase (Decrease) in Stockholders' Equity
Stock-based compensation				6
Options exercised			1	(1)
Change in reciprocal interest				54			18
Repurchase of noncontrolling interest				0					0
Other				(1)
Earnings attributable to controlling interests	$ 1,084				1,084
Preference share dividends					(94)
Dividends paid to reciprocal shareholder					4
Common share dividends declared					(1,640)
Other					1	0			(1)
Other comprehensive income/(loss) attributable to common shareholders, net of tax						(854)
Earnings attributable to noncontrolling interests									20
Change in unrealized loss on cash flow hedges									0
Foreign currency translation adjustments									(36)
Other comprehensive income/(loss) attributable to noncontrolling interests, net of tax									(36)
Comprehensive income/(loss) attributable to noncontrolling interests	16								(16)
Contributions									1
Distributions									(68)
Redemption of preferred shares held by subsidiary									0
Balance at the end of the period at Sep. 30, 2020	$ 68,435	$ 7,747	$ 64,764	$ 265	$ (8,442)	$ 899	$ (29)	$ 65,204	$ 3,231
Increase (Decrease) in Stockholders' Equity
Dividends paid per common share (in Canadian dollars per share)	$ 0.810
Earnings per common share attributable to common shareholders (in Canadian dollars per share)	0.49
Diluted earnings per common share attributable to common shareholders (in Canadian dollars per share)	$ 0.49