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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