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Post-employment benefit plans - Post-Employment Benefit Plan Assets (Details) - CAD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2025 | Dec. 31, 2024
Disclosure of fair value of plan assets [line items] |  |
Equity securities, total plan assets fair value percent | 14.00% | 13.00%
Debt securities, total plan assets fair value percent | 52.00% | 53.00%
Alternative investments, total plan asset fair value percent | 34.00% | 34.00%
Total plan assets fair value percent | 100.00% | 100.00%
Defined benefit obligation hedged | $ 3,000.0 |
DB pension |  |
Disclosure of fair value of plan assets [line items] |  |
Plan assets, at fair value | 24,413.0 | $ 24,188.0
Equity securities included in total plan assets | $ 0.1 | $ 0.1
Equity securities percent included in total plan assets | 0.10% | 0.10%
Debt securities included in total plan assets | $ 36.0 | $ 41.0
Debt securities percent included in total plan assets | 0.10% | 0.20%
DB pension | Money market |  |
Disclosure of fair value of plan assets [line items] |  |
Debt securities | $ 357.0 | $ 257.0
DB pension | Private equities |  |
Disclosure of fair value of plan assets [line items] |  |
Alternative investments | 1,077.0 | 1,066.0
DB pension | Hedge funds |  |
Disclosure of fair value of plan assets [line items] |  |
Alternative investments | 1,543.0 | 1,301.0
DB pension | Real estate and infrastructure |  |
Disclosure of fair value of plan assets [line items] |  |
Alternative investments | 4,452.0 | 4,341.0
DB pension | Private debt |  |
Disclosure of fair value of plan assets [line items] |  |
Alternative investments | 1,325.0 | 1,451.0
DB pension | Other |  |
Disclosure of fair value of plan assets [line items] |  |
Alternative investments | 24.0 | 23.0
DB pension | Canadian |  |
Disclosure of fair value of plan assets [line items] |  |
Equity securities | 759.0 | 862.0
DB pension | Canadian | Debt securities, excluding money market |  |
Disclosure of fair value of plan assets [line items] |  |
Debt securities | 10,075.0 | 11,117.0
DB pension | Foreign |  |
Disclosure of fair value of plan assets [line items] |  |
Equity securities | 2,577.0 | 2,344.0
DB pension | Foreign | Debt securities, excluding money market |  |
Disclosure of fair value of plan assets [line items] |  |
Debt securities | $ 2,224.0 | $ 1,426.0
Bottom of range |  |
Disclosure of fair value of plan assets [line items] |  |
Equity securities, weighted average target allocation | 0.00% |
Debt securities, weighted average target allocation | 40.00% |
Alternative investments, weighted average target allocation | 0.00% |
Top of range |  |
Disclosure of fair value of plan assets [line items] |  |
Equity securities, weighted average target allocation | 40.00% |
Debt securities, weighted average target allocation | 100.00% |
Alternative investments, weighted average target allocation | 60.00% |

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