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Other Long-Term Liabilities - Share-Based Compensation (Details) - CAD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Reconciliation Of Changes In Liabilities From Share-Based Payment Transactions [Roll Forward]
Balance – beginning of year	$ 832	$ 489	$ 160
Share-based compensation expense	491	804	514
Cash payment for stock options surrendered and PSUs vested	(110)	(79)	(48)
Transferred to common shares	(435)	(387)	(139)
Other	2	5	2
Balance – end of year	780	832	489
Less: current portion	538	559	329
Non-current liabilities from share-based payment arrangements	242	273	160
Share-based compensation	780	832	489
Certain Executives | Performance Share Units
Reconciliation Of Changes In Liabilities From Share-Based Payment Transactions [Roll Forward]
Balance – beginning of year	127	90
Balance – end of year	96	127	90
Share-based compensation	$ 96	$ 127	$ 90

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Current Liabilities From Share-Based Payment Arrangements

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

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Non-Current Liabilities From Share-Based Payment Transactions

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

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- Definition

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

+ References

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-Number 1
-IssueDate 2023-01-01
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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: Share-based payment arrangements [member]]

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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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