v3.25.4
Transactions with related parties - Narrative (Detail) - CAD ($)
$ in Millions
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Related Party Transaction [Line Items]      
Revenues [1] $ 46,918 $ 51,359 $ 50,702
Long-term debt, related party amount 3,447 3,447  
Debt-related interest 131 192 203
Affiliated Entity      
Related Party Transaction [Line Items]      
Revenues 13,534 14,654 16,166
Amounts of purchases by Imperial 5,369 6,651 6,747
Long-term debt, related party amount 3,447 3,447  
Debt-related interest 97 161  
Affiliated Entity | Exxon Mobil      
Related Party Transaction [Line Items]      
Revenues 13,534 14,654 16,166
Amounts of purchases by Imperial $ 5,227 6,546 6,648
Affiliated Entity | Previously Reported      
Related Party Transaction [Line Items]      
Revenues   11,725 13,544
Amounts of purchases by Imperial   3,722 4,125
Affiliated Entity | Previously Reported | Exxon Mobil      
Related Party Transaction [Line Items]      
Revenues   11,725 13,544
Amounts of purchases by Imperial   $ 3,617 $ 4,026
[1]
(a) Amounts from related parties included in revenues (note 16).13,534 14,654 16,166