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Post-retirement benefits - Summary of main assumptions rate for valuations of plans (Detail)
Dec. 31, 2024
Dec. 31, 2023
Disclosure of defined benefit plans [Line Items]    
Assumption for the consumer price index 2.70% 2.50%
Canada    
Disclosure of defined benefit plans [Line Items]    
Discount rate 4.60% 4.60%
Long-term inflation 2.00% 1.90%
Rate of increase in pensions 0.20% 0.20%
UK    
Disclosure of defined benefit plans [Line Items]    
Discount rate 5.40% 4.50%
Long-term inflation 3.10% 3.10%
Rate of increase in pensions 2.70% 2.60%
US    
Disclosure of defined benefit plans [Line Items]    
Discount rate 5.50% 4.80%
Long-term inflation 2.30% 2.20%
Rate of increase in pensions 0.00% 0.00%
Switzerland    
Disclosure of defined benefit plans [Line Items]    
Discount rate 0.90% 1.50%
Long-term inflation 1.00% 1.20%
Rate of increase in pensions 2.20% 2.30%