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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 |  |  |  |  |  |  |  |  |  |  |

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