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Retirement Benefit Plans - Summary of Defined Benefit Pension Plan Assets (Detail) - CAD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Disclosure of fair value of plan assets [line items] |  |
Equity securities (as a percent) | 33.00% | 33.00%
Debt securities (as a percent) | 46.00% | 46.00%
Real estate and other (as a percent) | 21.00% | 21.00%
Quoted |  |
Disclosure of fair value of plan assets [line items] |  |
Equity securities | $ 829 | $ 775
Debt securities | 1,138 | 1,099
Real estate and other | 69 | 52
Unquoted |  |
Disclosure of fair value of plan assets [line items] |  |
Equity securities | 0 | 0
Debt securities | 0 | 0
Real estate and other | $ 455 | $ 445

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