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Insurance (Details)
R$ in Thousands
Dec. 31, 2022
BRL (R$)
IfrsStatementLineItems [Line Items]  
Coverage R$ 5,354,985
Specified Risk [Member]  
IfrsStatementLineItems [Line Items]  
Coverage 2,185,827
Engineering Risk [Member]  
IfrsStatementLineItems [Line Items]  
Coverage 2,275,490
Guarantee Insurance Escrow Deposit [Member]  
IfrsStatementLineItems [Line Items]  
Coverage 600,000 [1]
Civil Liability Directors And Officers [Member]  
IfrsStatementLineItems [Line Items]  
Coverage 100,000
Civil Liability Work [Member]  
IfrsStatementLineItems [Line Items]  
Coverage 149,630
Civil Liabilitys Operations [Member]  
IfrsStatementLineItems [Line Items]  
Coverage 15,000
Other Insurance Coverages [Member]  
IfrsStatementLineItems [Line Items]  
Coverage R$ 29,038
[1] SABESP has an agreement that allows issuing policies that total such insured amount. Of the total, R$ 167.8 thousand in policies with guarantee insurance were issued.