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NONCONTROLLING INTERESTS - NONCONTROLLING (Details) - CAD ($) shares in Millions, $ in Millions	Dec. 31, 2020	Dec. 31, 2019
NONCONTROLLING INTERESTS
Noncontrolling interests	$ 2,996	$ 3,364
Algonquin Gas Transmission LLC
NONCONTROLLING INTERESTS
Noncontrolling interests	384	394
Maritimes and Northeast Pipeline
NONCONTROLLING INTERESTS
Noncontrolling interests	558	579
Renewable energy assets
NONCONTROLLING INTERESTS
Noncontrolling interests	1,646	1,864
Westcoast Energy Inc.
NONCONTROLLING INTERESTS
Noncontrolling interests	$ 408	$ 527
Westcoast Energy Inc. \| Cumulative redeemable preferred stock \| Preference shares (Note 21)
NONCONTROLLING INTERESTS
Number of redeemable preferred shares held by noncontrolling owners (in shares)	12.0	16.6

Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which is directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent (that is, noncontrolling interest, previously referred to as minority interest).

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