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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
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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