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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

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- Definition 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]] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 142 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_142_c&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition 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]] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 142 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_142_b&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount real estate contributes to the fair value of defined benefit plan assets. [Refer: Plan assets, at fair value; Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 142 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_142_d&doctype=Standard -URIDate 2020-01-01 + Details
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