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RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - Liquidity and Credit Risk (Details) - CAD ($)
9 Months Ended 12 Months Ended
Sep. 30, 2021
Dec. 31, 2020
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  
Letters of credit issued in lieu of cash collateral $ 0  
Derivative instruments    
LIQUIDITY RISK AND CREDIT RISK    
Maximum credit exposure with respect to derivative instruments 1,035,000,000 $ 872,000,000
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 471,000,000 481,000,000
Derivative instruments | US financial institutions    
LIQUIDITY RISK AND CREDIT RISK    
Maximum credit exposure with respect to derivative instruments 240,000,000 99,000,000
Derivative instruments | European financial institutions    
LIQUIDITY RISK AND CREDIT RISK    
Maximum credit exposure with respect to derivative instruments 176,000,000 28,000,000
Derivative instruments | Asian financial institutions    
LIQUIDITY RISK AND CREDIT RISK    
Maximum credit exposure with respect to derivative instruments 24,000,000 167,000,000
Derivative instruments | Other    
LIQUIDITY RISK AND CREDIT RISK    
Maximum credit exposure with respect to derivative instruments $ 124,000,000 $ 97,000,000