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Goodwill (Details) - CAD ($)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Goodwill [Roll Forward]
Balance, beginning of year	$ 12,184,000,000	$ 12,464,000,000
Disposition of Aitken Creek (Note 21)	0	(27,000,000)
Foreign currency translation impacts	928,000,000	(253,000,000)
Balance, end of year	13,112,000,000	12,184,000,000
Goodwill impairment loss	$ 0	$ 0

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- Definition

Amount, after accumulated impairment loss, of asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized.

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Amount of foreign currency translation gain (loss) which increases (decreases) asset representing future economic benefit from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized.

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