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Material accounting policies - Adoption of New or Amended Accounting Standards (Details) - CAD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disclosure of expected impact of initial application of new standards or interpretations [line items]
Other current assets	$ (264)	$ (324)
Cash	547	99	$ 289
Capital expenditures	(4,581)	(5,133)
Other financing activities	$ (24)	$ (31)

X

- Definition

The amount of cash on hand and demand deposits. [Refer: Cash on hand]

+ References

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

+ References

No definition available.

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- Definition

The amount of current assets that the entity does not separately disclose in the same statement or note. [Refer: Current assets]

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Inflows (outflows) of cash, classified as financing activities, that the entity does not separately disclose in the same statement or note.

+ References

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