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Cover Page - CAD ($)
 12 Months Ended
Dec. 31, 2019
Feb. 12, 2020
Jun. 30, 2019
Cover [Abstract]      
Document Type 10-K    
Document Period End Date Dec. 31, 2019    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY    
Document Transition Report false    
Entity Central Index Key 0000049938    
Current Fiscal Year End Date --12-31    
Entity Registrant Name IMPERIAL OIL LTD    
Document Annual Report true    
Amendment Flag false    
Entity Filer Category Large Accelerated Filer    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Shell Company false    
Entity File Number 0-12014    
Entity Small Business false    
Entity Incorporation, State or Country Code CA    
Entity Emerging Growth Company false    
Entity Address, Address Line One 505 QUARRY PARK BOULEVARD S.E.    
Entity Tax Identification Number 98-0017682    
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 1-800    
Local Phone Number 567-3776    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Common Stock, Shares Outstanding   739,223,338  
Entity Public Float     $ 8,408,104,050