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Retirement Benefit Plans - Summary of Defined Benefit Pension Plan Assets (Details) - CAD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Disclosure of fair value of plan assets [line items] |  |
Equity securities (as a percent) | 31.00% | 33.00%
Debt securities (as a percent) | 47.00% | 46.00%
Real estate and other (as a percent) | 22.00% | 21.00%
Quoted |  |
Disclosure of fair value of plan assets [line items] |  |
Equity securities | $ 559 | $ 829
Debt securities | 847 | 1,138
Real estate and other | 100 | 69
Unquoted |  |
Disclosure of fair value of plan assets [line items] |  |
Equity securities | 0 | 0
Debt securities | 0 | 0
Real estate and other | $ 303 | $ 455

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