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10 Trade receivables (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Summary of trade receivables [Line Items]        
Subtotal R$ 3,608,605 R$ 3,395,042    
Allowance for doubtful accounts (1,157,619) (1,042,015) R$ (1,099,442) R$ (1,067,973)
Total trade receivables 2,450,986 2,353,027    
Current 2,204,029 2,137,752    
Noncurrent 246,957 215,275    
Total 2,450,986 2,353,027    
Unbilled supply [member]        
Summary of trade receivables [Line Items]        
Subtotal 713,310 745,884    
Wholesale customers - Municipal governments [member]        
Summary of trade receivables [Line Items]        
Subtotal [1] 22,390 13,149    
Wholesale customers - Municipal governments [member] | Mogi das Cruzes [member]        
Summary of trade receivables [Line Items]        
Subtotal [1] 3,582 3,278    
Wholesale customers - Municipal governments [member] | Sao Caetano do Sul [member]        
Summary of trade receivables [Line Items]        
Subtotal [1] 18,808 9,871    
Private sector [member]        
Summary of trade receivables [Line Items]        
Subtotal 2,062,105 1,883,491    
Private sector [member] | General and special customers [member]        
Summary of trade receivables [Line Items]        
Subtotal [2],[3] 1,663,738 1,505,150    
Private sector [member] | Agreements [member]        
Summary of trade receivables [Line Items]        
Subtotal [4] 398,367 378,341    
Government entities [member]        
Summary of trade receivables [Line Items]        
Subtotal 810,800 752,518    
Government entities [member] | Agreements [member]        
Summary of trade receivables [Line Items]        
Subtotal [4] 333,740 277,047    
Government entities [member] | Municipal [member]        
Summary of trade receivables [Line Items]        
Subtotal 473,201 472,666    
Government entities [member] | Federal [member]        
Summary of trade receivables [Line Items]        
Subtotal R$ 3,859 R$ 2,805    
[1] Wholesale basis customers - municipal governments - This balance refers to invoices issued as a result of services provided to municipalities, which are responsible for distributing to, billing and charging final customers.
[2] General customers - residential and small and mid-sized companies
[3] Special customers - large consumers, commercial, industries, condominiums and special billing consumers (fixed demand agreements, industrial waste, wells, etc.).
[4] Agreements - installment payments of past-due receivables, plus monetary adjustment and interest, according to the agreements.