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

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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