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Other Long-Term Liabilities - Share-Based Compensation (Details) - CAD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Reconciliation Of Changes In Liabilities From Share-Based Payment Transactions [Roll Forward]
Balance – beginning of year	$ 780	$ 832	$ 489
Share-based compensation expense	279	491	804
Cash payment for stock options surrendered and PSUs vested	(84)	(110)	(79)
Transferred to common shares	(358)	(435)	(387)
Other	3	2	5
Balance – end of year	620	780	832
Liabilities from share-based payment transactions	620	780	832
Less: current portion	463	538	559
Non-current liabilities from share-based payment arrangements	$ 157	$ 242	$ 273

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- Definition

Current Liabilities From Share-Based Payment Arrangements

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- Definition

Liabilities From Share-Based Payment Transactions, Transferred To Common Shares Through Exercise Of Options

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No definition available.

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- Definition

Non-Current Liabilities From Share-Based Payment Transactions

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- Definition

Other Liabilities From Share-Based Payment Transactions

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- Definition

Reconciliation Of Changes In Liabilities From Share-Based Payment Transactions [Roll Forward]

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No definition available.

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- Definition

The amount of expense from share-based payment transactions with employees. [Refer: Expense from share-based payment transactions]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2024-01-01
-Paragraph 112
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-URIDate 2024-03-27

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- Definition

The amount of liabilities arising from share-based payment transactions. Share-based payment transactions are transactions in which the entity: (a) receives goods or services from the supplier of those goods or services (including an employee) in a share-based payment arrangement; or (b) incurs an obligation to settle the transaction with the supplier in a share-based payment arrangement when another group entity receives those goods or services. [Refer: Types of share-based payment arrangements [domain]]

+ References

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- Definition

The cash outflow for payments for equity instruments that the entity does not separately disclose in the same statement or note.

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