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Post-employment benefit plans - Components of Post-Employment Benefit Plans Financing Cost (Details) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024
Disclosure of net defined benefit liability (asset) [line items] |  |
Total net return on post-employment benefit plans | $ 102 | $ 66
DB pension |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Total net return on post-employment benefit plans | 133 | 99
OPEBs |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Total net return on post-employment benefit plans | $ (31) | $ (33)

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