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Post-retirement benefits - Summary of main assumptions rate for valuations of plans (Detail)
Dec. 31, 2023
Dec. 31, 2022
Disclosure of defined benefit plans [Line Items]    
Assumption for the consumer price index 2.50% 2.70%
Canada    
Disclosure of defined benefit plans [Line Items]    
Discount rate 4.60% 5.00%
Long-term inflation 1.90% 2.10%
Rate of increase in pensions 0.20% 0.50%
UK    
Disclosure of defined benefit plans [Line Items]    
Discount rate 4.50% 4.90%
Long-term inflation 3.10% 3.30%
Rate of increase in pensions 2.60% 2.80%
US    
Disclosure of defined benefit plans [Line Items]    
Discount rate 4.80% 5.30%
Long-term inflation 2.20% 2.40%
Rate of increase in pensions 0.00% 0.00%
Switzerland    
Disclosure of defined benefit plans [Line Items]    
Discount rate 1.50% 2.30%
Long-term inflation 1.20% 1.20%
Rate of increase in pensions 2.30% 3.40%