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NONCONTROLLING INTERESTS - NONCONTROLLING (Details) - CAD ($) shares in Millions, $ in Millions	Dec. 31, 2021	Dec. 31, 2020
NONCONTROLLING INTERESTS
Noncontrolling interests	$ 2,542	$ 2,996
Algonquin Gas Transmission LLC
NONCONTROLLING INTERESTS
Noncontrolling interests	377	384
Maritimes and Northeast Pipeline
NONCONTROLLING INTERESTS
Noncontrolling interests	546	558
Renewable energy assets
NONCONTROLLING INTERESTS
Noncontrolling interests	1,503	1,646
Westcoast Energy Inc.
NONCONTROLLING INTERESTS
Noncontrolling interests	$ 116	$ 408
Westcoast Energy Inc. | Cumulative redeemable preferred stock | Preferred Shares
NONCONTROLLING INTERESTS
Number of redeemable preferred shares held by noncontrolling owners (in shares)	0	12

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