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Adoption of amended accounting standards (Details) - CAD ($)
$ in Millions
Jun. 30, 2026
Mar. 31, 2026
Jan. 01, 2026
Dec. 31, 2025
Jun. 30, 2025
Mar. 31, 2025
Dec. 31, 2024
Adoption Of Amended Accounting Standards [Line Items]              
Cash $ 477 $ 1,367   $ 314 $ 507 $ 1,049 $ 1,572
Trade and other receivables 4,173     4,474      
Trade payables and other liabilities $ 4,167     $ 4,392      
Impact of Amendments to IFRS 9 and IFRS 7              
Adoption Of Amended Accounting Standards [Line Items]              
Cash     $ 107        
Trade and other receivables     2        
Trade payables and other liabilities     109        
Upon adoption of Amendments to IFRS 9 and IFRS 7              
Adoption Of Amended Accounting Standards [Line Items]              
Cash     421        
Trade and other receivables     4,476        
Trade payables and other liabilities     $ 4,501