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10 Trade receivables (Details Narrative) - BRL (R$) R$ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Trade Receivables |  |
Payment to settle administrative costs and terminate the services provided by SAMA | R$ 2,500 |
Non-recurring fair value for the transaction with Mauá | 280,774 |
Expenses with estimated losses increased | 444,826 | R$ 128,099
Receivables for the provision of water supply | 725,533 |
Compensation of assets due to resumption of water supply | R$ 85,918 |

X
- Definition The amount of compensation of assets due to resumption of water supply. + References No definition available. + Details
Name: | sbs_CompensationOfAssetsDueToResumptionOfWaterSupply
Namespace Prefix: | sbs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of expenses with estimated losses. + References No definition available. + Details
Name: | sbs_ExpensesWithEstimatedLosses
Namespace Prefix: | sbs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount represents information related to nonrecurring fair value for transaction with santo andre. + References No definition available. + Details
Name: | sbs_NonrecurringFairValueForTransactionWithSantoAndre
Namespace Prefix: | sbs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount represents information related to payment to settle administrative costs and terminate services provided by SEMASA. + References No definition available. + Details
Name: | sbs_PaymentToSettleAdministrativeCostsAndTerminateServicesProvidedBySEMASA
Namespace Prefix: | sbs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of receivables for provision of water supply. + References No definition available. + Details
Name: | sbs_ReceivablesForProvisionOfWaterSupply
Namespace Prefix: | sbs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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