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Changes in Accumulated other comprehensive income ("AOCI") by component (Details) - CAD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance $ 47,147 $ 44,823 $ 48,890 $ 42,411
Net other comprehensive income (loss) 672 (422) (1,112) 609
Ending balance 46,659 45,080 46,659 45,080
Foreign currency net of hedging activities        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance 1,678 1,816 3,413 837
Other comprehensive income (loss) before reclassifications 646 (412) (1,089) 567
Amounts reclassified from AOCI 0 0 0 0
Net other comprehensive income (loss) 646 (412) (1,089) 567
Ending balance 2,324 1,404 2,324 1,404
Derivatives        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance 11 8 10 5
Other comprehensive income (loss) before reclassifications 0 0 0 0
Amounts reclassified from AOCI (1) 1 0 4
Net other comprehensive income (loss) (1) 1 0 4
Ending balance 10 9 10 9
Pension and post-
retirement defined
benefit plans        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance (736) (1,446) (738) (1,463)
Other comprehensive income (loss) before reclassifications 0 0 0 0
Amounts reclassified from AOCI 3 9 5 26
Net other comprehensive income (loss) 3 9 5 26
Ending balance (733) (1,437) (733) (1,437)
Equity accounted investments        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance (2) 1 (5) 3
Other comprehensive income (loss) before reclassifications 3 (5) 6 (7)
Amounts reclassified from AOCI 0 0 0 0
Net other comprehensive income (loss) 3 (5) 6 (7)
Ending balance 1 (4) 1 (4)
Accumulated other comprehensive income (loss)        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance 951 379 2,680 (618)
Other comprehensive income (loss) before reclassifications 649 (417) (1,083) 560
Amounts reclassified from AOCI 2 10 5 30
Net other comprehensive income (loss) 651 (407) (1,078) 590
Ending balance $ 1,602 $ (28) $ 1,602 $ (28)