Related party transactions - Compensation of Key Management Personnel (Details) - CAD ($) $ in Millions |
12 Months Ended | |
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Dec. 31, 2025 |
Dec. 31, 2024 |
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| Related Party [Abstract] | ||
| Wages, salaries, fees and related taxes and benefits | $ (18) | $ (19) |
| Post-employment benefit plans and OPEBs cost | (3) | (3) |
| Share-based compensation | (32) | (26) |
| Key management personnel compensation expense | $ (53) | $ (48) |
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- Definition Related Party [Abstract] No definition available.
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- References Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- References Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- References Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- References Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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