v3.25.2
Other comprehensive income (loss) information - Changes in Accumulated Other Comprehensive Income (Loss) (Detail) - CAD ($)
$ in Millions
6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
At beginning of period $ 23,473  
At end of period 24,999 $ 23,936
Accumulated Defined Benefit Plans Adjustment Attributable to Parent    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
At beginning of period (214) (677)
Current period change excluding amounts reclassified from accumulated other comprehensive income 12 4
Amounts reclassified from accumulated other comprehensive income 10 25
At end of period $ (192) $ (648)