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Financial Instruments - Summary of Unrealized Risk Management Positions (Detail) - CAD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
Disclosure Of Recurring Fair Value Measurement Of Assets And Liabilities [Line Items]    
Risk management net asset (liability) $ (27) $ 46
Power Swap Contracts    
Disclosure Of Recurring Fair Value Measurement Of Assets And Liabilities [Line Items]    
Risk management net asset (liability) 2  
Level 2 of fair value hierarchy    
Disclosure Of Recurring Fair Value Measurement Of Assets And Liabilities [Line Items]    
Risk management asset 25 93
Risk management liability 52 47
Risk management net asset (liability) (27) 46
Level 2 of fair value hierarchy | Commodity price risk | Crude Oil, Natural Gas, Condensate and Refined Products    
Disclosure Of Recurring Fair Value Measurement Of Assets And Liabilities [Line Items]    
Risk management asset 0 2
Risk management liability 49 40
Risk management net asset (liability) (49) (38)
Level 2 of fair value hierarchy | Commodity price risk | Power Swap Contracts    
Disclosure Of Recurring Fair Value Measurement Of Assets And Liabilities [Line Items]    
Risk management asset 4 1
Risk management liability 2 7
Risk management net asset (liability) 2 (6)
Level 2 of fair value hierarchy | Commodity price risk | Renewable Power Contracts    
Disclosure Of Recurring Fair Value Measurement Of Assets And Liabilities [Line Items]    
Risk management asset 21 90
Risk management liability 0 0
Risk management net asset (liability) 21 90
Level 2 of fair value hierarchy | Currency risk | Foreign Exchange Rate Contracts    
Disclosure Of Recurring Fair Value Measurement Of Assets And Liabilities [Line Items]    
Risk management asset 0 0
Risk management liability 1 0
Risk management net asset (liability) $ (1) $ 0