Accumulated Other Comprehensive Income (Details) - CAD ($) $ in Millions |
Dec. 31, 2025 |
Dec. 31, 2024 |
|---|---|---|
| Analysis Of Other Comprehensive Income By Item [Abstract] | ||
| Derivative financial instruments designated as cash flow hedges | $ 66 | $ 70 |
| Foreign currency translation adjustment | 153 | 231 |
| Accumulated other comprehensive income | $ 219 | $ 301 |