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Other comprehensive income (loss) information - Changes in Accumulated Other Comprehensive Income (Loss) (Detail) - CAD ($) $ in Millions	9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024
AOCI Attributable to Parent, Net of Tax [Roll Forward]
At beginning of period	$ 23,473
At end of period	23,684	$ 23,639
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	15	38
At end of period	$ (187)	$ (635)

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Amount after tax, before reclassification adjustments, of other comprehensive income (loss), attributable to parent.

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