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Financial Instruments - Summary of Urealized Risk Management Positions (Detail) - CAD ($)
$ in Millions
Jun. 30, 2022
Dec. 31, 2021
Disclosure Of Recurring Fair Value Measurement Of Assets And Liabilities [Line Items]    
Risk Management Asset $ 34 $ 48
Risk Management Liability 33 116
Risk Management Net Asset (Liability) 1 (68)
Renewable Power Contracts    
Disclosure Of Recurring Fair Value Measurement Of Assets And Liabilities [Line Items]    
Risk Management Net Asset (Liability) 1  
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 30 46
Risk Management Liability 29 116
Risk Management Net Asset (Liability) 1 (70)
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 1 2
Risk Management Liability 0 0
Risk Management Net Asset (Liability) 1 2
Level 3 of fair value hierarchy    
Disclosure Of Recurring Fair Value Measurement Of Assets And Liabilities [Line Items]    
Risk Management Asset 53 53
Level 3 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 3 0
Risk Management Liability 4 0
Risk Management Net Asset (Liability) $ (1) $ 0