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SHORT-TERM BORROWINGS - Non-Revolving Credit Facility (Details) - Credit facilities $ in Millions | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Feb. 28, 2022 CAD ($) | Dec. 31, 2021 CAD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 CAD ($) | Dec. 31, 2020 USD ($) | Jun. 30, 2021 CAD ($)
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  | $ 1,600,000,000
Available liquidity |  | $ 1,200,000,000 |  |  |  |
Repayments of short-term borrowings |  | $ 1,003,000,000 | $ 800 | $ 0 | $ 0 |
Changes In Significant Commitments |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Repayments of short-term borrowings | $ 400,000,000 |  |  |  |  |

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