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Related Party Transactions - Summary of Key Management Compensation (Detail) - CAD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disclosure of transactions between related parties [abstract]
Salaries, Director Fees and Other Short-Term Benefits	$ 69	$ 21	$ 24
Post-Employment Benefits	4	3	2
Stock-Based Compensation	72	15	22
Other Long-Term Incentive Benefits	4	1	1
Termination Benefits	3	6	0
Total compensation paid or payable	$ 152	$ 46	$ 49

X

- Definition

Key management personnel compensation, salaries, bonuses, and other short-term employee benefits

+ References

No definition available.

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- Definition

The amount of compensation to key management personnel. [Refer: Key management personnel of entity or parent [member]]

+ References

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-Name IAS
-Number 24
-IssueDate 2021-01-01
-Paragraph 17
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- Definition

The amount of compensation to key management personnel in the form of other long-term employee benefits. [Refer: Other long-term employee benefits; Key management personnel of entity or parent [member]]

+ References

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- Definition

The amount of compensation to key management personnel in the form of post-employment benefits. [Refer: Key management personnel of entity or parent [member]]

+ References

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-Name IAS
-Number 24
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- Definition

The amount of compensation to key management personnel in the form of share-based payments. [Refer: Key management personnel of entity or parent [member]]

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-Number 24
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The amount of compensation to key management personnel in the form of termination benefits. [Refer: Termination benefits expense; Key management personnel of entity or parent [member]]

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