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9. Trade receivables (Details Narrative) - BRL (R$) R$ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Trade Receivables Details Narrative Abstract |  |
Revenue/(revenue reduction) with wholesale services | R$ 529,125 | R$ (203,496)

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- References No definition available. + Details
Name: | SBS_TradeReceivablesDetailsNarrativeAbstract
Namespace Prefix: | SBS_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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Name: | SBS_TradeReceivablesWholesaleLosses
Namespace Prefix: | SBS_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant