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Pensions and Other Post-Employment Benefits - Summary of Principal Weighted Average Actuarial Assumptions Used to Determine Benefit Obligations and Expenses (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2021 CAD ($) yr	Dec. 31, 2020 CAD ($) yr	Dec. 31, 2019 CAD ($) yr
Disclosure Of Actuarial Assumptions [Line Items]
Post-Employment Benefits | $	$ 89	$ 33	$ 29
Pension Benefits
Disclosure Of Actuarial Assumptions [Line Items]
Discount Rate	2.95%	2.50%	3.00%
Future Salary Growth Rate	4.03%	3.97%	3.94%
Average Longevity (years)	88.3	88.3	88.2
OPEB
Disclosure Of Actuarial Assumptions [Line Items]
Discount Rate	2.98%	2.50%	3.00%
Future Salary Growth Rate	4.94%	4.94%	5.08%
Average Longevity (years)	88.3	88.2	88.2
Health Care Cost Trend Rate	5.64%	6.00%	6.00%

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Disclosure of actuarial assumptions.

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The discount rate used as the significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit obligation, at present value; Actuarial assumptions [member]]

+ References

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The expected rate of salary increases used as a significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit plans [member]; Defined benefit obligation, at present value; Actuarial assumptions [member]]

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Medical cost trend rate used as significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit obligation, at present value; Actuarial assumptions [member]]

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The mortality rate used as a significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit obligation, at present value; Actuarial assumptions [member]]

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The amount of post-employment benefit expense included in profit or loss relating to defined benefit plans. [Refer: Profit (loss); Defined benefit plans [member]] [Contrast: Increase (decrease) in net defined benefit liability (asset) resulting from expense (income) in profit or loss]

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