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REVENUE - Schedule of Contract Balances (Details) - CAD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Revenue from Contract with Customer [Abstract]
Contract Receivables	$ 2,614	$ 3,764
Contract Assets	313	330
Contract Liabilities	$ 2,826	$ 2,828

X

- Definition

Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business.

+ References

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X

- Definition

Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
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X

- Definition

Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable.

+ References

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-Topic 606
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