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RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - Liquidity and Credit Risk (Details) - CAD ($)
12 Months Ended
Dec. 31, 2023
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  
Cash collateral $ 0 $ 0
Derivative Instruments    
LIQUIDITY RISK AND CREDIT RISK    
Maximum credit exposure with respect to derivative instruments 1,062,000,000 1,584,000,000
Derivative Instruments | Canadian financial institutions    
LIQUIDITY RISK AND CREDIT RISK    
Maximum credit exposure with respect to derivative instruments 457,000,000 644,000,000
Derivative Instruments | US financial institutions    
LIQUIDITY RISK AND CREDIT RISK    
Maximum credit exposure with respect to derivative instruments 252,000,000 277,000,000
Derivative Instruments | European financial institutions    
LIQUIDITY RISK AND CREDIT RISK    
Maximum credit exposure with respect to derivative instruments 107,000,000 334,000,000
Derivative Instruments | Asian financial institutions    
LIQUIDITY RISK AND CREDIT RISK    
Maximum credit exposure with respect to derivative instruments 121,000,000 224,000,000
Derivative Instruments | Other    
LIQUIDITY RISK AND CREDIT RISK    
Maximum credit exposure with respect to derivative instruments $ 125,000,000 $ 105,000,000