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Retirement plans liabilities (Details 7)
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%