Retirement Benefit Plans - Summary of Defined Benefit Pension Plan Assets (Detail) - CAD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Disclosure of fair value of plan assets [line items]
Equity securities (as a percent)	38.00%	36.00%
Debt securities (as a percent)	49.00%	50.00%
Real estate and other (as a percent)	13.00%	14.00%
Quoted
Disclosure of fair value of plan assets [line items]
Equity securities	$ 1,058	$ 957
Debt securities	1,385	1,322
Real estate and other	62	63
Unquoted
Disclosure of fair value of plan assets [line items]
Equity securities	0	0
Debt securities	0	0
Real estate and other	$ 307	$ 317

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 real estate contributes to the fair value of defined benefit plan assets. [Refer: Plan assets, at fair value; Defined benefit plans [member]]

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Percentage of real estate and other contributed to fair value of plan assets.

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