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22. Services payable (Details Narrative) - BRL (R$) R$ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Services Payable Details Narrative Abstract |  |
Services payable | R$ 454,022 | R$ 408,275

X
- 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