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FINANCIAL INSTRUMENTS AND RISK MANAGEMENT - Fair Value Hierarchy (Details) - CAD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Derivative Financial Instrument    
Balance, at fair value $ (98) $ (121)
Transfers of financial liabilities from level 1 to 2 0  
Transfers of financial liabilities from level 2 to 1 0  
Trade receivables    
Derivative Financial Instrument    
Financial assets, at fair value 123 153
Accounts Payable    
Derivative Financial Instrument    
Financial liabilities, at fair value (221) (274)
Level 1    
Derivative Financial Instrument    
Balance, at fair value (99) (139)
Level 1 | Trade receivables    
Derivative Financial Instrument    
Financial assets, at fair value 35 63
Level 1 | Accounts Payable    
Derivative Financial Instrument    
Financial liabilities, at fair value (134) (202)
Level 2    
Derivative Financial Instrument    
Balance, at fair value 1 18
Level 2 | Trade receivables    
Derivative Financial Instrument    
Financial assets, at fair value 88 90
Level 2 | Accounts Payable    
Derivative Financial Instrument    
Financial liabilities, at fair value $ (87) $ (72)