v3.26.1
Common shares - Narrative (Detail) - shares
Jun. 29, 2026
Jun. 15, 2026
Class of Stock [Line Items]    
Normal course issuer bid share repurchase term, months 12 months  
Normal Course Issuer Bid Effective From June Twenty Ninth Two Thousand And Twenty Six    
Class of Stock [Line Items]    
Normal course issuer bid share repurchase shares authorized 24,179,635  
Percent of total shares   5.00%
Normal Course Issuer Bid Effective From June Twenty Ninth Two Thousand And Twenty Six | ExxonMobil Holdings Corporation    
Class of Stock [Line Items]    
Exxon Mobil Corporation's ownership interest in Imperial 69.60%