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Post-employment benefit plans - Interest Cost (Details) - CAD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2026 | Jun. 30, 2025 | Jun. 30, 2026 | Jun. 30, 2025
Disclosure of defined benefit plans [line items] |  |  |  |
Total net return on post-employment benefit plans | $ 36 | $ 26 | $ 73 | $ 51
DB pension |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |
Total net return on post-employment benefit plans | 43 | 33 | 88 | 66
OPEBs |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |
Total net return on post-employment benefit plans | $ (7) | $ (7) | $ (15) | $ (15)

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