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The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

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The number of shares issued during the period upon the conversion of units. An example of a convertible unit is an umbrella partnership real estate investment trust unit (UPREIT unit).

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NONCONTROLLING INTERESTS - NONCONTROLLING INFORMATION (Details) $ / shares in Units, shares in Millions							3 Months Ended	12 Months Ended
	Mar. 20, 2019 CAD ($) $ / shares	Nov. 08, 2018 CAD ($)	Sep. 17, 2018 $ / shares	Aug. 24, 2018	Jan. 22, 2018 shares	Apr. 28, 2017 CAD ($)	Sep. 30, 2018 CAD ($)	Dec. 31, 2019 CAD ($) $ / shares	Dec. 31, 2018 CAD ($)	Dec. 31, 2017 CAD ($)	Aug. 01, 2018	Dec. 31, 2016 CAD ($)
NONCONTROLLING INTERESTS
Repurchase of noncontrolling interest	$ (300,000,000)								$ (4,469,000,000)	$ 0
Noncontrolling interests								$ 3,364,000,000	3,965,000,000
Redeemable noncontrolling interests									0	4,067,000,000		$ 3,392,000,000
Proceeds from issuance of preferred stock	300,000,000
Strategic Review Actions \| Enbridge Energy Partners, L.P.
NONCONTROLLING INTERESTS
Decrease to additional paid in capital						$ 421,000,000
Increase (decrease) to deferred income taxes						253,000,000
Increase (decrease) in noncontrolling interest						$ 458,000,000
Spectra Energy Partners, LP
NONCONTROLLING INTERESTS
Security shareholders entitlement share ratio				1.111
Repurchase of noncontrolling interest									3,000,000,000.0
Decrease to additional paid in capital									642,000,000
Increase (decrease) to deferred income taxes									(167,000,000)
Enbridge Energy Partners, L.P.
NONCONTROLLING INTERESTS
Security shareholders entitlement share ratio			0.335
Enbridge Energy Management, L.L.C. (EEM)
NONCONTROLLING INTERESTS
Security shareholders entitlement share ratio			0.335
Enbridge Energy Partners and Enbridge Energy Management
NONCONTROLLING INTERESTS
Decrease to additional paid in capital									3,700,000,000
Increase (decrease) to deferred income taxes									(707,000,000)
Increase (decrease) in noncontrolling interest									185,000,000
Enbridge Income Fund
NONCONTROLLING INTERESTS
Security shareholders entitlement share ratio			0.735
Repurchase of noncontrolling interest		$ 4,500,000,000
Decrease to additional paid in capital		25,000,000
Increase (decrease) to deferred income taxes		0
Shareholder entitlement cash payment per share \| $ / shares			$ 0.45
Common Shares
NONCONTROLLING INTERESTS
Common shares issued in acquisition, amount								0	12,727,000,000	0
Common Shares \| Spectra Energy Partners, LP
NONCONTROLLING INTERESTS
Common shares issued in acquisition, amount								0	3,888,000,000	0
Common Shares \| Enbridge Energy Partners, L.P.
NONCONTROLLING INTERESTS
Common shares issued in acquisition, amount								0	3,042,000,000	0
Common Shares \| Enbridge Energy Management, L.L.C. (EEM)
NONCONTROLLING INTERESTS
Common shares issued in acquisition, amount								0	1,267,000,000	0
Common Shares \| Enbridge Income Fund
NONCONTROLLING INTERESTS
Common shares issued in acquisition, amount		$ 4,500,000,000						0	4,530,000,000	0
Noncontrolling Interest
NONCONTROLLING INTERESTS
Repurchase of noncontrolling interest								(65,000,000)	0	0
Sale of noncontrolling interests in subsidiaries							$ 1,183,000,000	0	1,183,000,000	0
Noncontrolling interest, restructuring								0	1,486,000,000	0
Additional paid-in capital
NONCONTROLLING INTERESTS
Sale of noncontrolling interests in subsidiaries							79,000,000	0	79,000,000	0
Dilution gain on Spectra Energy Partners, LP restructuring (Note 20)								$ 0	$ 1,136,000,000	$ 0
Deferred Income Tax Liability
NONCONTROLLING INTERESTS
Sale of noncontrolling interests in subsidiaries							$ 27,000,000
Preference shares
NONCONTROLLING INTERESTS
Dividend payment	$ 4,000,000
Maritimes and Northeast Pipeline
NONCONTROLLING INTERESTS
Ownership interest percentage held by noncontrolling owners								22.20%	22.20%
Canadian Renewable Assets \| Discontinued Operations, Disposed of by Sale
NONCONTROLLING INTERESTS
Noncontrolling interest, ownership percentage by parent											49.00%
United States Renewable Assets \| Discontinued Operations, Disposed of by Sale
NONCONTROLLING INTERESTS
Noncontrolling interest, ownership percentage by parent											49.00%
Other Restructuring \| Spectra Energy Partners, LP
NONCONTROLLING INTERESTS
Increase (decrease) to deferred income taxes									$ 333,000,000
Stock issued during period, shares, conversion of units (in shares) \| shares					172.5
Noncontrolling interest, restructuring									1,500,000,000
Dilution gain on Spectra Energy Partners, LP restructuring (Note 20)									$ 1,100,000,000
Preference Shares, Series 7 \| Preference shares
NONCONTROLLING INTERESTS
Dividend rate (percent)	5.50%							4.45%
Redemption price (in dollars per shares) \| $ / shares	$ 25.00							$ 25
Series 8 Preferred Stock \| Preference shares
NONCONTROLLING INTERESTS
Dividend rate (percent)	5.60%
Redemption price (in dollars per shares) \| $ / shares	$ 25.00