v3.25.4
Cover Page - CAD ($)
 12 Months Ended
Dec. 31, 2025
Feb. 11, 2026
Jun. 30, 2025
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2025    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity File Number 0-12014    
Entity Registrant Name IMPERIAL OIL LIMITED    
Entity Incorporation, State or Country Code Z4    
Entity Tax Identification Number 98-0017682    
Entity Address, Address Line One 505 Quarry Park Boulevard S.E.    
Entity Address, City or Town Calgary    
Entity Address, State or Province AB    
Entity Address, Country CA    
Entity Address, Postal Zip Code T2C 5N1    
City Area Code 800    
Local Phone Number 567-3776    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Entity Shell Company false    
Entity Public Float     $ 16,740,858,786
Entity Common Stock, Shares Outstanding   483,592,715  
Amendment Flag false    
Document Fiscal Period Focus FY    
Entity Central Index Key 0000049938    
Document Fiscal Year Focus 2025    
Document Financial Statement Error Correction [Flag] false