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Post-retirement benefits - Summary of geographical distribution of defined benefit obligations (Detail) | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disclosure of defined benefit plans [Line Items] |  |  |
Defined benefit obligation | 100.00% | 100.00% | 100.00%
Canada |  |  |
Disclosure of defined benefit plans [Line Items] |  |  |
Defined benefit obligation | 58.00% | 57.00% | 58.00%
UK |  |  |
Disclosure of defined benefit plans [Line Items] |  |  |
Defined benefit obligation | 24.00% | 25.00% | 24.00%
US |  |  |
Disclosure of defined benefit plans [Line Items] |  |  |
Defined benefit obligation | 10.00% | 10.00% | 10.00%
Switzerland |  |  |
Disclosure of defined benefit plans [Line Items] |  |  |
Defined benefit obligation | 6.00% | 6.00% | 6.00%
Other countries |  |  |
Disclosure of defined benefit plans [Line Items] |  |  |
Defined benefit obligation | 2.00% | 2.00% | 2.00%
Pension benefits |  |  |
Disclosure of defined benefit plans [Line Items] |  |  |
Defined benefit obligation | 100.00% |  |
Pension benefits | Canada |  |  |
Disclosure of defined benefit plans [Line Items] |  |  |
Defined benefit obligation | 58.00% |  |
Pension benefits | UK |  |  |
Disclosure of defined benefit plans [Line Items] |  |  |
Defined benefit obligation | 26.00% |  |
Pension benefits | US |  |  |
Disclosure of defined benefit plans [Line Items] |  |  |
Defined benefit obligation | 8.00% |  |
Pension benefits | Switzerland |  |  |
Disclosure of defined benefit plans [Line Items] |  |  |
Defined benefit obligation | 6.00% |  |
Pension benefits | Other countries |  |  |
Disclosure of defined benefit plans [Line Items] |  |  |
Defined benefit obligation | 2.00% |  |
Other benefits |  |  |
Disclosure of defined benefit plans [Line Items] |  |  |
Defined benefit obligation | 100.00% |  |
Other benefits | Canada |  |  |
Disclosure of defined benefit plans [Line Items] |  |  |
Defined benefit obligation | 50.00% |  |
Other benefits | UK |  |  |
Disclosure of defined benefit plans [Line Items] |  |  |
Defined benefit obligation | 2.00% |  |
Other benefits | US |  |  |
Disclosure of defined benefit plans [Line Items] |  |  |
Defined benefit obligation | 45.00% |  |
Other benefits | Switzerland |  |  |
Disclosure of defined benefit plans [Line Items] |  |  |
Defined benefit obligation | 0.00% |  |
Other benefits | Other countries |  |  |
Disclosure of defined benefit plans [Line Items] |  |  |
Defined benefit obligation | 3.00% |  |

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table. + References No definition available. + Details
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- Definition Defined benefit obligation maturity percentage. + References No definition available. + Details
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- Details
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- Details
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- Details
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- Details
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- Details
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- Details
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- Details
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