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NONCONTROLLING INTERESTS - NONCONTROLLING (Details) - CAD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018 | Aug. 01, 2018
--- | --- | --- | ---
NONCONTROLLING INTERESTS |  |  |
Noncontrolling interests | $ 3,364 | $ 3,965 |
Algonquin Gas Transmission LLC |  |  |
NONCONTROLLING INTERESTS |  |  |
Noncontrolling interests | 394 | 518 |
Maritimes and Northeast Pipeline |  |  |
NONCONTROLLING INTERESTS |  |  |
Noncontrolling interests | 579 | 613 |
Renewable energy assets |  |  |
NONCONTROLLING INTERESTS |  |  |
Noncontrolling interests | 1,864 | 1,961 |
Westcoast Energy Inc. |  |  |
NONCONTROLLING INTERESTS |  |  |
Noncontrolling interests | 527 | 841 |
Other Non Controlling Interest |  |  |
NONCONTROLLING INTERESTS |  |  |
Noncontrolling interests | $ 0 | $ 32 |
Canadian Renewable Assets | Discontinued Operations, Disposed of by Sale |  |  |
NONCONTROLLING INTERESTS |  |  |
Noncontrolling interest, ownership percentage by parent |  |  | 49.00%
Magic Valley |  |  |
NONCONTROLLING INTERESTS |  |  |
Ownership interest percentage held by noncontrolling owners | 20.00% | 20.00% |
Maritimes and Northeast Pipeline |  |  |
NONCONTROLLING INTERESTS |  |  |
Ownership interest percentage held by noncontrolling owners | 22.20% | 22.20% |
Cumulative redeemable preferred stock | Westcoast Energy Inc. | Preference shares |  |  |
NONCONTROLLING INTERESTS |  |  |
Number of redeemable preferred shares held by noncontrolling owners (in shares) | 16,600,000 | 16,600,000 |
Cumulative first preferred stock | Westcoast Energy Inc. | Preference shares |  |  |
NONCONTROLLING INTERESTS |  |  |
Number of redeemable preferred shares held by noncontrolling owners (in shares) | 0 | 12,000,000 |

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