Supplementary Cash Flow Information - Non-Cash Working Capital (Details) - CAD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Disclosure Of Supplementary Cash Flow Information [Line Items]
Total Current Assets	$ 9,769		$ 9,769		$ 10,434
Total Current Liabilities	5,651		5,651		7,362
Working Capital	4,118		4,118		$ 3,072
Accounts Receivable and Accrued Revenues	(177)	$ 904	(542)	$ 326
Income Tax Receivable	6	14	172	191
Inventories	(19)	480	421	99
Accounts Payable and Accrued Liabilities	(188)	(896)	(186)	60
Income Tax Payable	(22)	105	(304)	96
Total Change in Non-Cash Working Capital	(400)	607	(439)	772
Net Change in Non-Cash Working Capital – Operating Activities	(241)	588	(179)	813
Net Change in Non-Cash Working Capital – Investing Activities	$ (159)	$ 19	$ (260)	$ (41)

Adjustments for decrease (increase) in income tax receivables

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Adjustments For Increase (Decrease) in Accounts Payable And Accrued Liabilities

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Disclosure Of Supplementary Cash Flow Information [Line Items]

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Increase (Decrease) in Working Capital from Investing Activities

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Increase (Decrease) in Working Capital from Operating Activities

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Working Capital

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Adjustments for decrease (increase) in trade accounts receivable to reconcile profit (loss) to net cash flow from (used in) operating activities. [Refer: Profit (loss)]

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Adjustments for impairment loss (reversal of impairment loss) on inventories recognised in profit or loss to reconcile profit (loss) to net cash flow from (used in) operating activities. [Refer: Inventories; Impairment loss; Adjustments for impairment loss (reversal of impairment loss) recognised in profit or loss; Impairment loss (reversal of impairment loss) recognised in profit or loss]

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Adjustments for income tax expense to reconcile profit (loss) to net cash flow from (used in) operating activities. [Refer: Profit (loss)]

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The amount of liabilities that: (a) the entity expects to settle in its normal operating cycle; (b) the entity holds primarily for the purpose of trading; (c) are due to be settled within twelve months after the reporting period; or (d) the entity does not have the right at the end of the reporting period to defer settlement for at least twelve months after the reporting period.

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The increase (decrease) in working capital.

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