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Impairment Charges and Reversals - Additional Information (Detail)
 12 Months Ended
Dec. 31, 2024
CAD ($)
Dec. 31, 2023
CAD ($)
Upstream    
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]    
CGU Impairments $ 0 $ 0
Upstream | Discount rate | Sunrise    
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]    
CGU Impairments $ 0  
Upstream | Discount rate | Discounted future cash flows    
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]    
Significant unobservable input, assets   0.01
Upstream | Discount rate | Discounted future cash flows | Sunrise    
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]    
Significant unobservable input, assets 0.01  
Upstream | Forward Price Estimate | Sunrise    
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]    
CGU Impairments $ 0  
Upstream | Forward Price Estimate | Discounted future cash flows    
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]    
Significant unobservable input, assets   0.05
Upstream | Forward Price Estimate | Discounted future cash flows | Sunrise    
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]    
Significant unobservable input, assets 0.05  
Upstream | Minimum | Discount rate | Discounted future cash flows    
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]    
Significant unobservable input, assets 0.14 0.14
Downstream    
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]    
CGU Impairments   $ 0
Downstream | Discount rate | Toledo CGU    
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]    
CGU Impairments $ 0  
Downstream | Discount rate | Discounted future cash flows    
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]    
Significant unobservable input, assets 0.01  
Downstream | Discount rate | Discounted future cash flows | Lima And Wood River    
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]    
CGU Impairments $ 214,000,000  
Significant unobservable input, assets 0.01  
Downstream | Forward Price Estimate | Toledo CGU    
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]    
CGU Impairments $ 0  
Downstream | Forward Price Estimate | Discounted future cash flows    
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]    
Significant unobservable input, assets 0.05  
Downstream | Forward Price Estimate | Discounted future cash flows | Lima And Wood River    
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]    
CGU Impairments $ 619,000,000  
Significant unobservable input, assets 0.05  
Downstream | Minimum | Discount rate | Discounted future cash flows    
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]    
Significant unobservable input, assets 0.15  
Downstream | Minimum | Forward Price Estimate | Discounted future cash flows    
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]    
Significant unobservable input, assets 0.01  
Downstream | Maximum | Discount rate | Discounted future cash flows    
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]    
Significant unobservable input, assets 0.16  
Downstream | Maximum | Forward Price Estimate | Discounted future cash flows    
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]    
Significant unobservable input, assets 0.06