financial instruments - Credit risk (Details) - CAD ($) $ in Millions |
Jun. 30, 2026 |
Dec. 31, 2025 |
|---|---|---|
| Credit risk | ||
| Maximum exposure (excluding income tax effects) to credit risk | $ 6,383 | $ 7,783 |
| Cash and temporary investments, net | ||
| Credit risk | ||
| Maximum exposure (excluding income tax effects) to credit risk | 1,387 | 2,621 |
| Accounts receivable | ||
| Credit risk | ||
| Maximum exposure (excluding income tax effects) to credit risk | 4,071 | 4,383 |
| Contract assets | ||
| Credit risk | ||
| Maximum exposure (excluding income tax effects) to credit risk | 696 | 731 |
| Derivative assets | ||
| Credit risk | ||
| Maximum exposure (excluding income tax effects) to credit risk | $ 229 | $ 48 |