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Post-retirement benefits - Summary of geographical distribution of defined benefit obligations (Detail)	12 Months Ended
	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.

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No definition available.

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- Definition

Defined benefit obligation maturity percentage.

+ References

No definition available.

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