Leases - Schedule Of Measurement Of Lease Liabilities and Right Of Use Assets (Detail) - CAD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
|
| Cash paid for amounts included in the measurement of lease liabilities | |||
| Cash flows from operating activities, Operating leases | $ 121 | $ 118 | $ 56 |
| Cash flows from operating activities, Finance leases | 0 | 0 | 0 |
| Cash flows from financing activities, Finance leases | 18 | 22 | 22 |
| Non-cash right of use assets recorded for lease liabilities | |||
| In exchange for lease liabilities during the year, Operating leases | 107 | 152 | 61 |
| In exchange for lease liabilities during the year, Finance leases | $ 17 | $ 0 | $ 0 |