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RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - Liquidity and Credit Risk (Details) - CAD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2024
Dec. 31, 2023
LIQUIDITY RISK AND CREDIT RISK    
Rolling time period over which the Company forecasts cash requirements (in months) 12 months  
Period of anticipated requirements for which the Company maintains sufficient liquidity through committed credit facilities (in years) 1 year  
Derivative instruments    
LIQUIDITY RISK AND CREDIT RISK    
Maximum credit exposure with respect to derivative instruments $ 717,000,000 $ 1,062,000,000
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 353,000,000 457,000,000
Derivative instruments | US financial institutions    
LIQUIDITY RISK AND CREDIT RISK    
Maximum credit exposure with respect to derivative instruments 91,000,000 252,000,000
Derivative instruments | European financial institutions    
LIQUIDITY RISK AND CREDIT RISK    
Maximum credit exposure with respect to derivative instruments 69,000,000 107,000,000
Derivative instruments | Asian financial institutions    
LIQUIDITY RISK AND CREDIT RISK    
Maximum credit exposure with respect to derivative instruments 85,000,000 121,000,000
Derivative instruments | Other    
LIQUIDITY RISK AND CREDIT RISK    
Maximum credit exposure with respect to derivative instruments $ 119,000,000 $ 125,000,000