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27. Insurance (Details) R$ in Thousands | Dec. 31, 2018 BRL (R$)
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SummaryOfInsuranceLineItems [Line Items] |
Coverage | R$ 3,708,099
Specified risks - fire |
SummaryOfInsuranceLineItems [Line Items] |
Coverage | 2,007,219
Engineering risk |
SummaryOfInsuranceLineItems [Line Items] |
Coverage | 911,961
Guarantee insurance for escrow deposit |
SummaryOfInsuranceLineItems [Line Items] |
Coverage | 500,000
Traditional guarantee insurance |
SummaryOfInsuranceLineItems [Line Items] |
Coverage | 100,000
Civil liability- DO (Directors and Officers) |
SummaryOfInsuranceLineItems [Line Items] |
Coverage | 100,000
Civil liability- works |
SummaryOfInsuranceLineItems [Line Items] |
Coverage | 72,435
Domestic and international transportation |
SummaryOfInsuranceLineItems [Line Items] |
Coverage | 11,470
Civil liability - operations |
SummaryOfInsuranceLineItems [Line Items] |
Coverage | 5,000
Other |
SummaryOfInsuranceLineItems [Line Items] |
Coverage | R$ 14

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

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Namespace Prefix: | SBS_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | ifrs-full_TypesOfInsuranceContractsAxis=SBS_SpecifiedRiskMember
Namespace Prefix: |
Data Type: | na
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Name: | ifrs-full_TypesOfInsuranceContractsAxis=SBS_EngineeringRiskMember
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Data Type: | na
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Name: | ifrs-full_TypesOfInsuranceContractsAxis=SBS_GuaranteeInsuranceEscrowDepositMember
Namespace Prefix: |
Data Type: | na
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Name: | ifrs-full_TypesOfInsuranceContractsAxis=SBS_TraditionalGuaranteeInsuranceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
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Name: | ifrs-full_TypesOfInsuranceContractsAxis=SBS_CivilLiabilityDirectorsAndOfficersMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
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Name: | ifrs-full_TypesOfInsuranceContractsAxis=SBS_CivilLiabilityWorksMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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Name: | ifrs-full_TypesOfInsuranceContractsAxis=SBS_DomesticAndInternationalTransportationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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Name: | ifrs-full_TypesOfInsuranceContractsAxis=SBS_CivilLiabilityOperationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_TypesOfInsuranceContractsAxis=SBS_OtherInsuranceCoverageMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |