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Decommissioning Liabilities - Summary of Changes to the Credit-Adjusted Risk-Free Rate or the Inflation Rate Impact on the Decommissioning Liabilities (Detail) - CAD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Disclosure of other provisions [line items]    
Credit-adjusted risk-free rate, sensitivity range 1.00% 1.00%
Inflation rate, sensitivity range 1.00% 1.00%
One percent increase    
Disclosure of other provisions [line items]    
Credit-adjusted risk-free rate $ (487) $ (387)
Inflation rate 615 519
One percent decrease    
Disclosure of other provisions [line items]    
Credit-adjusted risk-free rate 595 515
Inflation rate $ (507) $ (392)