XML 110 R96.htm IDEA: XBRL DOCUMENT v3.21.1
10 Trade receivables (Details Narrative) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Trade Receivables    
Payment to settle administrative costs and terminate the services provided by SAMA R$ 2,500  
Non-recurring fair value for the transaction with Mauá 280,774  
Expenses with estimated losses increased 444,826 R$ 128,099
Receivables for the provision of water supply 725,533  
Compensation of assets due to resumption of water supply R$ 85,918