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Other operating income (expense) (Tables)
12 Months Ended
Dec. 31, 2022
Other Operating Income  
Schedule of other operating income expense
                    
   Note   12.31.22   12.31.21   12.31.20 
Other operating income                
Income from customer surcharges        3,031    3,771    4,556 
Commissions on municipal taxes collection        673    700    658 
Fines to suppliers        118    229       
Services provided to third parties        616    482    707 
Related parties   30.a                127 
Recovery of provision for contingences                    610 
Income from non-reimbursable customer
contributions
        62    91    78 
Expense recovery        50    61    208 
Construction plan Framework agreement   2.d    3,013    4,012       
Recovery of allowance for the impairment of trade receivables - Agreement on the Regularization of Obligations   2.c    2,650             
Other        195    85    137 
Total other operating income        10,408    9,431    7,081 
                     
Other operating expense                    
Gratifications for services        (227)   (1,682)   (150)
Cost for services provided to third parties        (546)   (218)   (282)
Severance paid        (102)   (71)   (72)
Debit and Credit Tax        (1,947)   (2,081)   (2,406)
Provision for contingencies   34    (4,405)   (4,580)   (2,616)
Disposals of property, plant and equipment        (348)   (485)   (442)
Refund of fines to suppliers                    (380)
Other        (45)   (402)   (273)
Total other operating expense        (7,620)   (9,519)   (6,621)