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Employee benefits plans - Economic actuarial assumptions and biometric data (Details) - Pension defined benefit plans [member]
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure of defined benefit plans [line items]    
Retirement Age 65 years 65 years
Family Composition 4 4
Percentage of Plan Participants, Men Married At Least Four Years And Over Sixty-Five Years Of Age 90.00% 90.00%
Percentage of Permanency in the Plan 100.00% 100.00%
Actuarial assumption of discount rates [member]    
Disclosure of defined benefit plans [line items]    
Nominal discount rate – medical assistance and life insurance 11.16% 9.14%
Actuarial assumption of medical cost trend rates [member]    
Disclosure of defined benefit plans [line items]    
Medical cost growth rate 6.86% 6.86%
Actuarial assumption of expected rates of inflation [member]    
Disclosure of defined benefit plans [line items]    
Nominal inflation 3.50% 3.50%
Actuarial Assumption, Aging Factor, Ages: 0 to 24 years    
Disclosure of defined benefit plans [line items]    
Percentage of Aging Factor 1.50% 1.50%
Actuarial Assumption, Aging Factor, Ages: 25 to 54 years    
Disclosure of defined benefit plans [line items]    
Percentage of Aging Factor 2.50% 2.50%
Actuarial Assumption, Aging Factor, Ages: 55 to 79 years    
Disclosure of defined benefit plans [line items]    
Percentage of Aging Factor 4.50% 4.50%
Actuarial Assumption, Aging Factor, Ages: Above 80 years    
Disclosure of defined benefit plans [line items]    
Percentage of Aging Factor 2.50% 2.50%
Actuarial assumption of mortality rates [member]    
Disclosure of defined benefit plans [line items]    
Description Of Biometric Table Of General Mortality AT-2000 AT-2000
Description Of Biometric Table Of General Mortality For Disabled Persons IAPB 57 IAPB 57
Percentage of Turnover 1.00% 1.00%