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Pensions and Other Post-Employment Benefits - Summary of Fair Value of the Plan Assets (Detail) - CAD ($) $ in Millions	Dec. 31, 2021	Jan. 01, 2021	Dec. 31, 2020
Disclosure of defined benefit plans [line items]
Equity Funds	$ 77		$ 58
Fixed Income Funds	54		35
Real Estate Funds	9		6
Listed Infrastructure Funds	8		8
Emerging Market Debt Funds	8		7
Cash and Cash Equivalents	2		2
Non-Invested Assets	1		1
Total fair value	$ 159		$ 117
United States
Disclosure of defined benefit plans [line items]
Total fair value		$ 32

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Noninvested assets amount contributed to fair value of plan assets.

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Real estate funds contributed to fair value of plan assets.

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The amount cash and cash equivalents contribute to the fair value of defined benefit plan assets. [Refer: Cash and cash equivalents; Plan assets, at fair value; Defined benefit plans [member]]

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The amount instruments representing debt (rather than equity) contribute to the fair value of defined benefit plan assets. [Refer: Plan assets, at fair value; Defined benefit plans [member]]

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The amount instruments representing equity (rather than debt) contribute to the fair value of defined benefit plan assets. [Refer: Plan assets, at fair value; Defined benefit plans [member]]

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The amount investment funds contribute to the fair value of defined benefit plan assets. [Refer: Plan assets, at fair value; Defined benefit plans [member]; Investment funds [member]]

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The fair value of defined benefit plan assets. Plan assets comprise assets held by a long-term employee benefit fund and qualifying insurance policies. [Refer: At fair value [member]]

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