OTHER INCOME/(EXPENSE) (Details) - CAD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Other Income and Expenses [Abstract]
Realized foreign currency gain/(loss)	$ (80)	$ (34)	$ (366)	$ 80
Unrealized foreign currency gain/(loss)	(425)	255	824	(816)
Net defined pension and OPEB credit	71	44	215	133
Other	137	111	519	397
Total	$ (297)	$ 376	$ 1,192	$ (206)

Other Nonoperating Income (Expense), Other

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- Definition

Amount, before tax, of realized gain (loss) from foreign currency transaction.

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Amount, before tax, of unrealized gain (loss) from foreign currency transaction.

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Amount of expense (reversal of expense) for net periodic benefit cost components, excluding service cost component, of defined benefit plan. Amount includes, but is not limited to, interest cost, expected (return) loss on plan asset, amortization of prior service cost (credit), amortization of (gain) loss, amortization of transition (asset) obligation, settlement (gain) loss, curtailment (gain) loss and certain termination benefits.

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Amount of income (expense) related to nonoperating activities, classified as other.

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