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Common Shares - Additional Information (Detail) - shares
Jun. 27, 2019
Jun. 29, 2020
Apr. 01, 2020
Jun. 13, 2019
Class of Stock [Line Items]        
Normal course issuer bid share repurchase shares authorized 38,211,086 50,000    
Number of shares purchased in the current issuer bid program     28,697,514  
Percent of total shares       5.00%
Exxon Mobil Corporation's ownership interest in Imperial 69.60% 69.60%    
Normal course issuer bid share repurchase term, months 12 months