Employee retirement benefits - Assumptions (Detail) |
Dec. 31, 2025 |
Dec. 31, 2024 |
|---|---|---|
| Pension benefits | ||
| Defined Benefit Plan Disclosure [Line Items] | ||
| Discount rate | 4.90% | 4.70% |
| Long-term rate of compensation increase | 4.00% | 4.00% |
| Other postretirement benefits | ||
| Defined Benefit Plan Disclosure [Line Items] | ||
| Discount rate | 4.90% | 4.70% |
| Long-term rate of compensation increase | 4.00% | 4.00% |
| X | ||||||||||
- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition Weighted average rate increase of compensation, used to determine benefit obligation of defined benefit plan. Plan includes, but is not limited to, pay-related defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|