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financial instruments - Contract assets (Details) - CAD ($) $ in Millions | Jun. 30, 2026 | Mar. 31, 2026 | Dec. 31, 2025 | Jun. 30, 2025 | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | --- | --- | --- | --- | ---
Credit risk |  |  |  |  |  |
Contract assets | $ 817 | $ 849 | $ 864 | $ 862 | $ 913 | $ 939
Cost/Gross amount |  |  |  |  |  |
Credit risk |  |  |  |  |  |
Contract assets | 850 |  | 896 |  |  |
Allowance for doubtful accounts |  |  |  |  |  |
Credit risk |  |  |  |  |  |
Contract assets | (33) |  | (32) |  |  |
The 12-month period ending one year hence |  |  |  |  |  |
Credit risk |  |  |  |  |  |
Contract assets | 554 |  | 590 |  |  |
The 12-month period ending one year hence | Cost/Gross amount |  |  |  |  |  |
Credit risk |  |  |  |  |  |
Contract assets | 576 |  | 612 |  |  |
The 12-month period ending one year hence | Allowance for doubtful accounts |  |  |  |  |  |
Credit risk |  |  |  |  |  |
Contract assets | (22) |  | (22) |  |  |
The 12-month period ending two years hence |  |  |  |  |  |
Credit risk |  |  |  |  |  |
Contract assets | 222 |  | 231 |  |  |
The 12-month period ending two years hence | Cost/Gross amount |  |  |  |  |  |
Credit risk |  |  |  |  |  |
Contract assets | 231 |  | 240 |  |  |
The 12-month period ending two years hence | Allowance for doubtful accounts |  |  |  |  |  |
Credit risk |  |  |  |  |  |
Contract assets | (9) |  | (9) |  |  |
Thereafter |  |  |  |  |  |
Credit risk |  |  |  |  |  |
Contract assets | 41 |  | 43 |  |  |
Thereafter | Cost/Gross amount |  |  |  |  |  |
Credit risk |  |  |  |  |  |
Contract assets | 43 |  | 44 |  |  |
Thereafter | Allowance for doubtful accounts |  |  |  |  |  |
Credit risk |  |  |  |  |  |
Contract assets | $ (2) |  | $ (1) |  |  |

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