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Leases - Additional Information (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Leases Disclosure [Line Items]    
Cash outflow in relation to lease obligation $ 10 $ 9
Real Estate [member] | Bottom Of Range [Member]    
Leases Disclosure [Line Items]    
Terms of operating lease commitments 1 year  
Real Estate [member] | Top of Range [Member]    
Leases Disclosure [Line Items]    
Terms of operating lease commitments 10 years  
Vehicles [member] | Bottom Of Range [Member]    
Leases Disclosure [Line Items]    
Terms of operating lease commitments 3 years  
Vehicles [member] | Top of Range [Member]    
Leases Disclosure [Line Items]    
Terms of operating lease commitments 4 years  
Rig Equipment [Member]    
Leases Disclosure [Line Items]    
Long-term drilling contracts $ 774 $ 503
Rig Equipment [Member] | Bottom Of Range [Member]    
Leases Disclosure [Line Items]    
Term of operating leases under long term drilling contracts 1 year  
Rig Equipment [Member] | Top of Range [Member]    
Leases Disclosure [Line Items]    
Term of operating leases under long term drilling contracts 5 years