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21. Services payable (Details Narrative) - BRL (R$) R$ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Services Payable Details Narrative |  |
Services payable | R$ 408,275 | R$ 460,054

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- References No definition available. + Details
Name: | SBS_ServicesPayable
Namespace Prefix: | SBS_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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