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Retirement plans liabilities (Details 13)
 12 Months Ended
Dec. 31, 2025
Rate
Dec. 31, 2024
Rate
Benefits plans 01 [Member]    
Disclosure of defined benefit plans [line items]    
Discount rates used for cash flows from retirement plan contracts 13.76% 15.37%
Benefits plans 03 [Member]    
Disclosure of defined benefit plans [line items]    
Discount rates used for cash flows from retirement plan contracts 13.30% 15.94%
Benefits plans 05 [Member]    
Disclosure of defined benefit plans [line items]    
Discount rates used for cash flows from retirement plan contracts 13.69% 15.56%
Benefits plans 10 [Member]    
Disclosure of defined benefit plans [line items]    
Discount rates used for cash flows from retirement plan contracts 13.69% 14.84%
Benefits plans 20 [Member]    
Disclosure of defined benefit plans [line items]    
Discount rates used for cash flows from retirement plan contracts 12.16% 13.93%
Insurance liabilities [Member] | Benefits plans 01 [Member]    
Disclosure of defined benefit plans [line items]    
Discount rates used for cash flows from retirement plan contracts 10.06% 8.53%
Insurance liabilities [Member] | Benefits plans 03 [Member]    
Disclosure of defined benefit plans [line items]    
Discount rates used for cash flows from retirement plan contracts 8.85% 9.69%
Insurance liabilities [Member] | Benefits plans 05 [Member]    
Disclosure of defined benefit plans [line items]    
Discount rates used for cash flows from retirement plan contracts 8.64% 9.59%
Insurance liabilities [Member] | Benefits plans 10 [Member]    
Disclosure of defined benefit plans [line items]    
Discount rates used for cash flows from retirement plan contracts 8.20% 9.37%
Insurance liabilities [Member] | Benefits plans 20 [Member]    
Disclosure of defined benefit plans [line items]    
Discount rates used for cash flows from retirement plan contracts 7.89% 9.27%