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NONCONTROLLING INTERESTS - NONCONTROLLING INFORMATION (Details) $ / shares in Units, shares in Millions, $ in Millions |  |  |  |  |  |  |  |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 16, 2020 CAD ($) $ / shares | Mar. 20, 2019 CAD ($) $ / shares | Dec. 20, 2018 CAD ($) | Dec. 17, 2018 CAD ($) | Nov. 07, 2018 CAD ($) | Sep. 17, 2018 $ / shares | Aug. 24, 2018 | Jan. 22, 2018 shares | Sep. 30, 2018 CAD ($) | Dec. 31, 2020 CAD ($) $ / shares | Dec. 31, 2019 CAD ($) | Dec. 31, 2018 CAD ($) | Jul. 31, 2018
NONCONTROLLING INTERESTS |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of preferred stock |  | $ 300 |  |  |  |  |  |  |  |  |  |  |
Decrease in noncontrolling interests |  |  |  |  |  |  |  |  |  | $ 112 | $ 300 |  |
Noncontrolling interests |  |  |  |  |  |  |  |  |  | 2,996 | 3,364 |  |
Spectra Energy Partners, LP |  |  |  |  |  |  |  |  |  |  |  |  |
NONCONTROLLING INTERESTS |  |  |  |  |  |  |  |  |  |  |  |  |
Security shareholders entitlement share ratio |  |  |  |  |  |  | 1.111 |  |  |  |  |  |
Noncontrolling interests |  |  |  | $ 3,900 |  |  |  |  |  |  |  |  |
Increase (decrease) in noncontrolling interest |  |  |  | (3,000) |  |  |  |  |  |  |  |  |
Increase (decrease) to additional paid in capital |  |  |  | (642) |  |  |  |  |  |  |  |  |
Increase (decrease) to deferred income taxes |  |  |  | $ (167) |  |  |  |  |  |  |  |  |
Enbridge Energy Partners, L.P. |  |  |  |  |  |  |  |  |  |  |  |  |
NONCONTROLLING INTERESTS |  |  |  |  |  |  |  |  |  |  |  |  |
Security shareholders entitlement share ratio |  |  |  |  |  | 0.335 |  |  |  |  |  |  |
Noncontrolling interests |  |  | $ 3,000 |  |  |  |  |  |  |  |  |  |
Enbridge Energy Management, L.L.C. (EEM) |  |  |  |  |  |  |  |  |  |  |  |  |
NONCONTROLLING INTERESTS |  |  |  |  |  |  |  |  |  |  |  |  |
Security shareholders entitlement share ratio |  |  |  |  |  | 0.335 |  |  |  |  |  |  |
Noncontrolling interests |  |  | 1,300 |  |  |  |  |  |  |  |  |  |
Enbridge Energy Partners and Enbridge Energy Management |  |  |  |  |  |  |  |  |  |  |  |  |
NONCONTROLLING INTERESTS |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in noncontrolling interest |  |  | 185 |  |  |  |  |  |  |  |  |  |
Increase (decrease) to additional paid in capital |  |  | (3,700) |  |  |  |  |  |  |  |  |  |
Increase (decrease) to deferred income taxes |  |  | $ (707) |  |  |  |  |  |  |  |  |  |
Enbridge Income Fund |  |  |  |  |  |  |  |  |  |  |  |  |
NONCONTROLLING INTERESTS |  |  |  |  |  |  |  |  |  |  |  |  |
Decrease in noncontrolling interests |  |  |  |  | $ 4,500 |  |  |  |  |  |  |  |
Security shareholders entitlement share ratio |  |  |  |  |  | 0.735 |  |  |  |  |  |  |
Increase (decrease) to additional paid in capital |  |  |  |  | (25) |  |  |  |  |  |  |  |
Shareholder entitlement cash payment per share (CAD per share) | $ / shares |  |  |  |  |  | $ 0.45 |  |  |  |  |  |  |
Purchase price |  |  |  |  | $ 4,500 |  |  |  |  |  |  |  |
Redeemable noncontrolling interests |  |  |  |  |  |  |  |  |  |  |  | $ 0 |
Preference shares (Note 21) |  |  |  |  |  |  |  |  |  |  |  |  |
NONCONTROLLING INTERESTS |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend payment |  | $ 4 |  |  |  |  |  |  |  |  |  |  |
Discontinued Operations, Disposed of by Sale |  |  |  |  |  |  |  |  |  |  |  |  |
NONCONTROLLING INTERESTS |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in noncontrolling interest |  |  |  |  |  |  |  |  | $ 1,200 |  |  |  |
Increase (decrease) to additional paid in capital |  |  |  |  |  |  |  |  | 79 |  |  |  |
Increase (decrease) to deferred income taxes |  |  |  |  |  |  |  |  | $ 27 |  |  |  |
Canadian Renewable Assets | Discontinued Operations, Disposed of by Sale |  |  |  |  |  |  |  |  |  |  |  |  |
NONCONTROLLING INTERESTS |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling interest (percent) |  |  |  |  |  |  |  |  |  |  |  |  | 49.00%
United States Renewable Assets | Discontinued Operations, Disposed of by Sale |  |  |  |  |  |  |  |  |  |  |  |  |
NONCONTROLLING INTERESTS |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling interest (percent) |  |  |  |  |  |  |  |  |  |  |  |  | 49.00%
Other Restructuring |  |  |  |  |  |  |  |  |  |  |  |  |
NONCONTROLLING INTERESTS |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) to additional paid in capital |  |  |  |  |  |  |  |  |  |  |  | 1,100 |
Increase (decrease) to deferred income taxes |  |  |  |  |  |  |  |  |  |  |  | 333 |
Stock issued during period, shares, conversion of units (in shares) | shares |  |  |  |  |  |  |  | 172.5 |  |  |  |  |
Noncontrolling interest, restructuring |  |  |  |  |  |  |  |  |  |  |  | $ 1,500 |
Westcoast Energy Inc. |  |  |  |  |  |  |  |  |  |  |  |  |
NONCONTROLLING INTERESTS |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling interests |  |  |  |  |  |  |  |  |  | $ 408 | $ 527 |  |
Preference Shares, Series 7 | Preference shares (Note 21) |  |  |  |  |  |  |  |  |  |  |  |  |
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 (Note 21) |  |  |  |  |  |  |  |  |  |  |  |  |
NONCONTROLLING INTERESTS |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend rate (percent) |  | 5.60% |  |  |  |  |  |  |  |  |  |  |
Redemption price (in dollars per shares) | $ / shares |  | $ 25.00 |  |  |  |  |  |  |  |  |  |  |
Series10 Preferred Stock | Preference shares (Note 21) |  |  |  |  |  |  |  |  |  |  |  |  |
NONCONTROLLING INTERESTS |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption price (in dollars per shares) | $ / shares | $ 25.00 |  |  |  |  |  |  |  |  |  |  |  |
Series10 Preferred Stock | Westcoast Energy Inc. | Preference shares (Note 21) |  |  |  |  |  |  |  |  |  |  |  |  |
NONCONTROLLING INTERESTS |  |  |  |  |  |  |  |  |  |  |  |  |
Par value of redeemable interest | $ 115 |  |  |  |  |  |  |  |  |  |  |  |

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