v3.26.1
Pension plan and other post-employment benefits (Details 5) - Expenditure Planned For 2022 [Member]
R$ in Thousands
 12 Months Ended
Dec. 31, 2025
BRL (R$)
P B S 1 [Member]  
IfrsStatementLineItems [Line Items]  
Current service cost (with interest)
Interest on actuarial obligations 3,206
Expected return on assets (5,127)
Interest on the effect of the (asset)/liability limit 1,291
Total unrecognized net expense (revenue) (630)
P B S Assisted 1 [Member]  
IfrsStatementLineItems [Line Items]  
Current service cost (with interest)
Interest on actuarial obligations 882
Expected return on assets (1,670)
Interest on the effect of the (asset)/liability limit 557
Total unrecognized net expense (revenue) (231)
Administration Agreement 1 [Member]  
IfrsStatementLineItems [Line Items]  
Current service cost (with interest)
Interest on actuarial obligations 7
Expected return on assets (28)
Interest on the effect of the (asset)/liability limit 3
Total unrecognized net expense (revenue) (18)
P A M E C Asset Policy 1 [Member]  
IfrsStatementLineItems [Line Items]  
Current service cost (with interest)
Interest on actuarial obligations 117
Expected return on assets
Interest on the effect of the (asset)/liability limit
Total unrecognized net expense (revenue) 117
A E S Telecom 1 [Member]  
IfrsStatementLineItems [Line Items]  
Current service cost (with interest)
Interest on actuarial obligations 999
Expected return on assets (1,176)
Interest on the effect of the (asset)/liability limit 177
Total unrecognized net expense (revenue)
Medical Plans [Member]  
IfrsStatementLineItems [Line Items]  
Current service cost (with interest) 101
Interest on actuarial obligations 364
Expected return on assets
Interest on the effect of the (asset)/liability limit
Total unrecognized net expense (revenue) R$ 465