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RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - Liquidity and Credit Risk (Details) - CAD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2023 | Jun. 30, 2022 | Dec. 31, 2022
LIQUIDITY RISK AND CREDIT RISK |  |  |
Rolling time period over which the Company forecasts cash requirements | 12 months |  |
Period of anticipated requirements for which the Company maintains sufficient liquidity through committed credit facilities | 1 year |  |
Derivative instruments |  |  |
LIQUIDITY RISK AND CREDIT RISK |  |  |
Maximum credit exposure with respect to derivative instruments | $ 949,000,000 | $ 1,584,000,000 |
Cash collateral on asset exposure | 0 |  | $ 0
Derivative instruments | Canadian financial institutions |  |  |
LIQUIDITY RISK AND CREDIT RISK |  |  |
Maximum credit exposure with respect to derivative instruments | 471,000,000 | 644,000,000 |
Derivative instruments | US financial institutions |  |  |
LIQUIDITY RISK AND CREDIT RISK |  |  |
Maximum credit exposure with respect to derivative instruments | 115,000,000 | 277,000,000 |
Derivative instruments | European financial institutions |  |  |
LIQUIDITY RISK AND CREDIT RISK |  |  |
Maximum credit exposure with respect to derivative instruments | 178,000,000 | 334,000,000 |
Derivative instruments | Asian financial institutions |  |  |
LIQUIDITY RISK AND CREDIT RISK |  |  |
Maximum credit exposure with respect to derivative instruments | 97,000,000 | 224,000,000 |
Derivative instruments | Other |  |  |
LIQUIDITY RISK AND CREDIT RISK |  |  |
Maximum credit exposure with respect to derivative instruments | $ 88,000,000 | $ 105,000,000 |

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