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NONCONTROLLING INTERESTS - NONCONTROLLING INFORMATION (Details) - CAD ($) $ / shares in Units, $ in Millions |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Oct. 15, 2021 | Jan. 15, 2021 | Mar. 20, 2019 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
NONCONTROLLING INTERESTS |  |  |  |  |  |
Proceeds from issuance of preferred stock |  |  | $ 300 |  |  |
Decrease in noncontrolling interests |  |  |  |  |  | $ 300
Par value of redeemable interest |  |  |  | $ 7,747 | $ 7,747 |
Accounts payable and other |  |  |  | 9,767 | 9,228 |
Redemption of preferred shares held by subsidiary |  |  |  | $ 415 | 0 | $ 300
Preferred Shares |  |  |  |  |  |
NONCONTROLLING INTERESTS |  |  |  |  |  |
Dividend payment |  |  | $ 4 |  |  |
Preference Shares, Series 7 | Preferred Shares |  |  |  |  |  |
NONCONTROLLING INTERESTS |  |  |  |  |  |
Dividend rate (percent) |  |  | 5.50% | 4.45% |  |
Redemption price (in dollars per shares) |  |  | $ 25 | $ 25 |  |
Series 8 Preferred Stock | Preferred Shares |  |  |  |  |  |
NONCONTROLLING INTERESTS |  |  |  |  |  |
Dividend rate (percent) |  |  | 5.60% |  |  |
Redemption price (in dollars per shares) |  |  | $ 25 |  |  |
Series10 Preferred Stock | Westcoast Energy Inc. | Preferred Shares |  |  |  |  |  |
NONCONTROLLING INTERESTS |  |  |  |  |  |
Temporary equity, redemption, minimum term (in years) |  | 5 years |  |  |  |
Par value of redeemable interest |  | $ 115 |  |  | $ 115 |
Series12 Preferred Stock | Westcoast Energy Inc. | Preferred Shares |  |  |  |  |  |
NONCONTROLLING INTERESTS |  |  |  |  |  |
Temporary equity, redemption, minimum term (in years) | 5 years |  |  |  |  |
Par value of redeemable interest | $ 300 |  |  |  |  |
Decrease in noncontrolling interest |  |  |  | $ 293 |  |

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