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Retirement Benefit Plans - Summary of Defined Benefit Pension Plan Assets (Detail) - CAD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Disclosure of fair value of plan assets [line items] |  |
Equity securities (as a percent) | 33.00% | 37.00%
Debt securities (as a percent) | 46.00% | 49.00%
Real estate and other (as a percent) | 21.00% | 14.00%
Quoted |  |
Disclosure of fair value of plan assets [line items] |  |
Equity securities | $ 775 | $ 1,069
Debt securities | 1,099 | 1,389
Real estate and other | 52 | 71
Unquoted |  |
Disclosure of fair value of plan assets [line items] |  |
Equity securities | 0 | 0
Debt securities | 0 | 0
Real estate and other | $ 445 | $ 329

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