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				21
Options exercised			55	(49)
Change in reciprocal interest				109			37
Repurchase of noncontrolling interest				65					(65)
Other				48
Earnings attributable to controlling interests	$ 3,818				3,818
Preference share dividends					(191)
Dividends paid to reciprocal shareholder					9
Common share dividends declared					(1,500)
Other					10	55			6
Other comprehensive income/(loss) attributable to common shareholders, net of tax						(2,603)
Earnings/(loss) attributable to noncontrolling interests									35
Change in unrealized loss on cash flow hedges									(5)
Foreign currency translation adjustments									(94)
Other comprehensive income/(loss) attributable to noncontrolling interests, net of tax									(99)
Comprehensive income/(loss) attributable to noncontrolling interests	64								(64)
Contributions									9
Distributions									(100)
Redemption of preferred shares held by subsidiary									(300)
Balance at the end of the period at Jun. 30, 2019	$ 72,805	7,747	64,732	194	(3,392)	124	(51)	$ 69,354	3,451
Increase (Decrease) in Stockholders' Equity
Dividends paid per common share (in Canadian dollars per share)	$ 1.476
Earnings per common share attributable to common shareholders (in Canadian dollars per share)	1.80
Diluted earnings per common share attributable to common shareholders (in Canadian dollars per share)	$ 1.80
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 Mar. 31, 2019		7,747	64,728	72	(3,640)	1,449	(51)		3,614
Increase (Decrease) in Stockholders' Equity
Stock-based compensation				17
Options exercised			4	(6)
Change in reciprocal interest	$ 0						0
Repurchase of noncontrolling interest	65								(65)
Other				46
Earnings attributable to controlling interests	1,832				1,832
Preference share dividends					(96)
Dividends paid to reciprocal shareholder					4
Common share dividends declared					(1,500)
Other					8	0			1
Other comprehensive income/(loss) attributable to common shareholders, net of tax						(1,325)
Earnings/(loss) attributable to noncontrolling interests									(2)
Change in unrealized loss on cash flow hedges									(4)
Foreign currency translation adjustments									(45)
Other comprehensive income/(loss) attributable to noncontrolling interests, net of tax									(49)
Comprehensive income/(loss) attributable to noncontrolling interests	51								(51)
Contributions									6
Distributions									(54)
Redemption of preferred shares held by subsidiary									0
Balance at the end of the period at Jun. 30, 2019	$ 72,805	7,747	64,732	194	(3,392)	124	(51)	69,354	3,451
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)	0.86
Diluted earnings per common share attributable to common shareholders (in Canadian dollars per share)	$ 0.86
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				19
Options exercised			17	(18)
Change in reciprocal interest				12			4
Repurchase of noncontrolling interest				0					0
Other				7
Earnings attributable to controlling interests	408				408
Preference share dividends					(190)
Dividends paid to reciprocal shareholder					10
Common share dividends declared					(1,641)
Other					(4)	0			0
Other comprehensive income/(loss) attributable to common shareholders, net of tax						2,025
Earnings/(loss) attributable to noncontrolling interests									5
Change in unrealized loss on cash flow hedges									(3)
Foreign currency translation adjustments									93
Other comprehensive income/(loss) attributable to noncontrolling interests, net of tax									90
Comprehensive income/(loss) attributable to noncontrolling interests	(95)								95
Contributions									20
Distributions									(164)
Redemption of preferred shares held by subsidiary									0
Balance at the end of the period at Jun. 30, 2020	$ 69,941	7,747	64,763	207	(7,797)	1,753	(47)	66,626	3,315
Increase (Decrease) in Stockholders' Equity
Dividends paid per common share (in Canadian dollars per share)	$ 1.620
Earnings per common share attributable to common shareholders (in Canadian dollars per share)	0.11
Diluted earnings per common share attributable to common shareholders (in Canadian dollars per share)	$ 0.11
Balance at the beginning of the period at Mar. 31, 2020		7,747	64,760	202	(7,808)	3,989	(47)		3,448	$ 0
Increase (Decrease) in Stockholders' Equity
Stock-based compensation				5
Options exercised			3	(2)
Change in reciprocal interest				0			0
Repurchase of noncontrolling interest				0					0
Other				2
Earnings attributable to controlling interests	$ 1,741				1,741
Preference share dividends					(94)
Dividends paid to reciprocal shareholder					5
Common share dividends declared					(1,641)
Other					0	0			0
Other comprehensive income/(loss) attributable to common shareholders, net of tax						(2,236)
Earnings/(loss) attributable to noncontrolling interests									36
Change in unrealized loss on cash flow hedges									(1)
Foreign currency translation adjustments									(85)
Other comprehensive income/(loss) attributable to noncontrolling interests, net of tax									(86)
Comprehensive income/(loss) attributable to noncontrolling interests	50								(50)
Contributions									5
Distributions									(88)
Redemption of preferred shares held by subsidiary									0
Balance at the end of the period at Jun. 30, 2020	$ 69,941	$ 7,747	$ 64,763	$ 207	$ (7,797)	$ 1,753	$ (47)	$ 66,626	$ 3,315
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)	0.82
Diluted earnings per common share attributable to common shareholders (in Canadian dollars per share)	$ 0.82