Leases - Schedule Of Lease Cost (Detail) - CAD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
|
| Leases [Abstract] | |||
| Operating lease cost | $ 105 | $ 111 | $ 114 |
| Short-term and other (net of sublease rental income) | 108 | 50 | 30 |
| Amortization of right of use assets | 16 | 16 | 19 |
| Interest on lease liabilities | 27 | 28 | 29 |
| Total operating lease cost | 213 | 161 | 144 |
| Total finance lease cost | $ 43 | $ 44 | $ 48 |
| X | ||||||||||
- Definition Finance Lease Cost No definition available.
|
| X | ||||||||||
- Definition Operating Lease And Short-Term Lease, Cost No definition available.
|
| X | ||||||||||
- Definition Amount of interest expense on finance lease liability. Reference 1: http://www.xbrl.org/2003/role/exampleRef
|
| X | ||||||||||
- Definition Amount of amortization expense attributable to right-of-use asset from finance lease. Reference 1: http://www.xbrl.org/2003/role/exampleRef
|
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Definition Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability. Reference 1: http://www.xbrl.org/2003/role/exampleRef
|
| X | ||||||||||
- Definition Amount of short-term lease cost, excluding expense for lease with term of one month or less. Reference 1: http://www.xbrl.org/2003/role/exampleRef
|