XML 114 R100.htm IDEA: XBRL DOCUMENT
v3.21.1

12 Investments (Details) - BRL (R$) R$ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Summary of investments [Line Items] |  |  |  |  |
Equity |  | R$ 22,793,704 | R$ 21,635,783 | R$ 19,551,688 | R$ 17,513,009
Dividends distributed |  | 231,611 | 800,352 |  |
Other comprehensive income |  | 511,169 | (363,076) | (10,994) |
Profit for the year |  | 973,318 | 3,367,517 | 2,835,068 |
Investments |  | 63,417 | 53,187 |  |
Other comprehensive income |  | 17 | (17) | 0 |
Other investments [member] |  |  |  |  |
Summary of investments [Line Items] |  |  |  |  |
Investments |  | 6,099 | 365 |  |
Overall total |  | 63,417 | 53,187 |  |
Saneaqua mairinque [member] |  |  |  |  |
Summary of investments [Line Items] |  |  |  |  |
Equity | [1] | 4,013 | 4,783 | 5,720 |
Dividends distributed |  | 0 |  |  |
Other comprehensive income |  | 17 |  |  |
Profit for the year | [1] | (770) | (871) | (790) |
Profit for the year - change in the equity | [2] | 0 |  |  |
Investments |  | 0 | 1,434 |  |
Dividends distributed - change in the equity |  | 0 |  |  |
Reclassification | [3] | (1,203) |  |  |
Equity in the earnings of subsidiaries |  | (248) | R$ (262) | R$ (237) |
Equity in the earnings of subsidiaries - change in the equity | [2] | R$ 0 |  |  |
Interest percentage |  | 4.60% | 30.00% | 30.00% |
Aguas de castilho [member] |  |  |  |  |
Summary of investments [Line Items] |  |  |  |  |
Equity |  | R$ 8,533 | R$ 7,242 | R$ 6,084 |
Dividends distributed |  | (322) |  |  |
Profit for the year |  | 1,600 | 1,767 | 1,001 |
Profit for the year - change in the equity |  | 13 |  |  |
Investments |  | 2,560 | 2,172 |  |
Dividends distributed - change in the equity |  |  | (97) |  |
Other comprehensive income |  | 0 |  |  |
Reclassification |  | 0 |  |  |
Equity in the earnings of subsidiaries |  | R$ 481 | 529 | R$ 300 |
Equity in the earnings of subsidiaries - change in the equity | [2] |  | R$ 4 |  |
Interest percentage |  | 30.00% | 30.00% | 30.00% |
Sesamm [member] |  |  |  |  |
Summary of investments [Line Items] |  |  |  |  |
Equity |  | R$ 51,514 | R$ 45,923 | R$ 43,547 |
Dividends distributed |  | (1,741) |  |  |
Profit for the year |  | 7,332 | 4,418 | 5,621 |
Profit for the year - change in the equity | [2] | 0 |  |  |
Investments |  | 18,546 | 16,533 |  |
Dividends distributed - change in the equity |  | (627) |  |  |
Other comprehensive income |  | 0 |  |  |
Reclassification |  | 0 |  |  |
Equity in the earnings of subsidiaries |  | 2,640 | R$ 1,591 | R$ 2,023 |
Equity in the earnings of subsidiaries - change in the equity | [2] | R$ 0 |  |  |
Interest percentage |  | 36.00% | 36.00% | 36.00% |
Aguas de andradina [member] |  |  |  |  |
Summary of investments [Line Items] |  |  |  |  |
Equity |  | R$ 29,576 | R$ 30,065 | R$ 24,832 |
Dividends distributed |  | (1,267) |  |  |
Other comprehensive income |  | 0 |  |  |
Profit for the year |  | 3,403 | 7,271 | 2,407 |
Profit for the year - change in the equity | [2] | (2,625) |  |  |
Investments |  | 8,873 | 9,020 |  |
Dividends distributed - change in the equity |  | (380) |  |  |
Reclassification |  |  |  | 0 |
Equity in the earnings of subsidiaries |  | 1,020 | R$ 2,181 | R$ 722 |
Equity in the earnings of subsidiaries - change in the equity | [2] | R$ (787) |  |  |
Interest percentage |  | 30.00% | 30.00% | 30.00% |
Attend ambiental [member] |  |  |  |  |
Summary of investments [Line Items] |  |  |  |  |
Equity |  | R$ 11,409 | R$ 7,486 | R$ 1,426 |
Dividends distributed |  | 0 |  |  |
Profit for the year |  | 3,958 | (18,217) | (3,743) |
Profit for the year - change in the equity |  | (35) |  |  |
Investments |  | 5,134 | 3,369 |  |
Dividends distributed - change in the equity |  | 0 |  |  |
Reclassification |  | 0 |  |  |
Equity in the earnings of subsidiaries |  | 1,781 | R$ (8,198) | R$ (1,684) |
Equity in the earnings of subsidiaries - change in the equity | [2] | R$ (16) |  |  |
Interest percentage |  | 45.00% | 45.00% | 45.00% |
Aquapolo ambiental [member] |  |  |  |  |
Summary of investments [Line Items] |  |  |  |  |
Equity |  | R$ 41,903 | R$ 37,772 | R$ 30,170 |
Dividends distributed |  | (15,000) |  |  |
Other comprehensive income |  | 0 |  |  |
Profit for the year |  | 19,131 | 16,283 | 11,413 |
Profit for the year - change in the equity | [2] | 0 |  |  |
Investments |  | 20,532 | 18,508 |  |
Dividends distributed - change in the equity |  | (7,350) |  |  |
Reclassification |  | 0 |  |  |
Equity in the earnings of subsidiaries |  | R$ 9,374 | R$ 7,979 | R$ 5,592 |
Interest percentage |  | 49.00% | 49.00% | 49.00% |
Paulista geradora de energia [member] |  |  |  |  |
Summary of investments [Line Items] |  |  |  |  |
Equity |  | R$ 6,692 | R$ 7,144 | R$ 7,625 |
Dividends distributed |  | 0 |  |  |
Profit for the year |  | (452) | (481) | (822) |
Profit for the year - change in the equity | [2] | 0 |  |  |
Investments |  | 1,673 | 1,786 |  |
Reclassification |  | 0 |  |  |
Equity in the earnings of subsidiaries |  | R$ (113) | R$ (119) | R$ (206) |
Interest percentage |  | 25.00% | 25.00% | 25.00% |
Paulista geradora de energia [member] |  |  |  |  |
Summary of investments [Line Items] |  |  |  |  |
Interest percentage |  | 25.00% | 25.00% | 25.00% |
Total |  |  |  |  |
Summary of investments [Line Items] |  |  |  |  |
Other comprehensive income |  | R$ 17 |  |  |
Investments |  | 57,318 | R$ 52,822 |  |
Dividends distributed - change in the equity |  | (8,454) |  |  |
Reclassification |  | (1,203) |  |  |
Equity in the earnings of subsidiaries |  | 14,935 | R$ 3,701 | R$ 6,510 |
Equity in the earnings of subsidiaries - change in the equity | [2] | R$ (799) |  |  |
[1] | The amounts presented for 2020 refer to July 31, 2020.
[2] | Refer to changes in the equity of investees, as their financial statements for the year ended December 31, 2019 were issued, including some adjustments, after the Companys financial statements.
[3] | On August 20, 2020, the investee Saneaqua Mairinque held an Extraordinary Shareholders' Meeting that approved a capital increase in the amount of R$ 21,944, through the issue of 17,178,988 shares. SABESP waived its preemptive right in the participation of such capital increase, and the shares then issued because of the capital increase were entirely subscribed by the shareholder BRK Ambiental, resulting in the dilution of SABESP's interest in the investee. Accordingly, SABESP discontinued the equity accounting method and recorded this financial asset under the fair value on the transaction date, in the amount of R$ 5,734 recorded as "Other investments". The amounts corresponding to the equity result were recorded until July 2020.

X
- Definition The amount of dividends that the company has declared but not yet paid. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_55&doctype=Standard -URIDate 2020-01-01 + Details
Name: | ifrs-full_DividendPayables
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount of residual interest in the assets of the entity after deducting all its liabilities. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 1 -IssueDate 2020-01-01 -Paragraph 24 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=1&code=ifrs-tx-2020-en-r&anchor=para_24_a&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 1 -IssueDate 2020-01-01 -Paragraph 32 -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=1&code=ifrs-tx-2020-en-r&anchor=para_32_a_i&doctype=Standard -URIDate 2020-01-01 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2020-01-01 -Paragraph 93 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2020-en-r&anchor=para_93_a&doctype=Standard -URIDate 2020-01-01 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2020-01-01 -Paragraph 93 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2020-en-r&anchor=para_93_b&doctype=Standard -URIDate 2020-01-01 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2020-01-01 -Paragraph 93 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2020-en-r&anchor=para_93_e&doctype=Standard -URIDate 2020-01-01 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_55&doctype=Standard -URIDate 2020-01-01 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 78 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_78_e&doctype=Standard -URIDate 2020-01-01 + Details
Name: | ifrs-full_Equity
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount of investments accounted for using the equity method. The equity method is a method of accounting whereby the investment is initially recognised at cost and adjusted thereafter for the post-acquisition change in the investor's share of net assets of the investee. The investor's profit or loss includes its share of the profit or loss of the investee. The investor's other comprehensive income includes its share of the other comprehensive income of the investee. [Refer: At cost [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2020-01-01 -Paragraph 24 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2020-en-r&anchor=para_24_a&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2020-01-01 -Paragraph B16 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2020-en-r&anchor=para_B16&doctype=Appendix&subtype=B -URIDate 2020-01-01 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 54 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_54_e&doctype=Standard -URIDate 2020-01-01 + Details
Name: | ifrs-full_InvestmentAccountedForUsingEquityMethod
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of income and expense (including reclassification adjustments) that is not recognised in profit or loss as required or permitted by IFRSs. [Refer: IFRSs [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 106 -Subparagraph d -Clause ii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_106_d_ii&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2020-01-01 -Paragraph B12 -Subparagraph b -Clause viii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2020-en-r&anchor=para_B12_b_viii&doctype=Appendix&subtype=B -URIDate 2020-01-01 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 81A -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_81A_b&doctype=Standard -URIDate 2020-01-01 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 91 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_91_a&doctype=Standard -URIDate 2020-01-01 + Details
Name: | ifrs-full_OtherComprehensiveIncome
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The total of income less expenses from continuing and discontinued operations, excluding the components of other comprehensive income. [Refer: Other comprehensive income] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2020-01-01 -Paragraph 18 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2020-en-r&anchor=para_18_b&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 1 -IssueDate 2020-01-01 -Paragraph 24 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=1&code=ifrs-tx-2020-en-r&anchor=para_24_b&doctype=Standard -URIDate 2020-01-01 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 1 -IssueDate 2020-01-01 -Paragraph 32 -Subparagraph a -Clause ii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=1&code=ifrs-tx-2020-en-r&anchor=para_32_a_ii&doctype=Standard -URIDate 2020-01-01 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2020-01-01 -Paragraph 28 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2020-en-r&anchor=para_28_b&doctype=Standard -URIDate 2020-01-01 Reference 5: http://www.xbrl.org/2003/role/exampleRef -Note Effective on first application of IFRS 9 -Name IFRS -Number 4 -IssueDate 2020-01-01 -Paragraph 39L -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=4&code=ifrs-tx-2020-en-b&anchor=para_39L_e&doctype=Standard -URIDate 2020-01-01 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2020-01-01 -Paragraph 23 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2020-en-r&anchor=para_23&doctype=Standard -URIDate 2020-01-01 Reference 7: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 12 -IssueDate 2020-01-01 -Paragraph B10 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2020-en-r&anchor=para_B10_b&doctype=Appendix&subtype=B -URIDate 2020-01-01 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 106 -Subparagraph d -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_106_d_i&doctype=Standard -URIDate 2020-01-01 Reference 9: http://www.xbrl.org/2003/role/exampleRef -Note Effective 2021-01-01 -Name IFRS -Number 17 -IssueDate 2020-01-01 -Paragraph 113 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=17&code=ifrs-tx-2020-en-r&anchor=para_113_b&doctype=Standard -URIDate 2020-01-01 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 81A -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_81A_a&doctype=Standard -URIDate 2020-01-01 + Details
Name: | ifrs-full_ProfitLoss
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The proportion of ownership interest in a joint venture attributable to the entity. [Refer: Joint ventures [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 27 -IssueDate 2020-01-01 -Paragraph 17 -Subparagraph b -Clause iii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=27&code=ifrs-tx-2020-en-r&anchor=para_17_b_iii&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 27 -IssueDate 2020-01-01 -Paragraph 16 -Subparagraph b -Clause iii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=27&code=ifrs-tx-2020-en-r&anchor=para_16_b_iii&doctype=Standard -URIDate 2020-01-01 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2020-01-01 -Paragraph 21 -Subparagraph a -Clause iv -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2020-en-r&anchor=para_21_a_iv&doctype=Standard -URIDate 2020-01-01 + Details
Name: | ifrs-full_ProportionOfOwnershipInterestInJointVenture
Namespace Prefix: | ifrs-full_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of financial assets reclassified into the held-to-maturity investments category. [Refer: Held-to-maturity investments; Financial assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2021-01-01 -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph 12 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_12&doctype=Standard&book=b -URIDate 2020-01-01 + Details
Name: | ifrs-full_ReclassificationIntoHeldtomaturityInvestments
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount represents information related to dividends distributed change in equity + References No definition available. + Details
Name: | sbs_DividendsDistributedChangeInEquity
Namespace Prefix: | sbs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount represents information related to equity in earnings of subsidiaries change in equity. + References No definition available. + Details
Name: | sbs_EquityInEarningsOfSubsidiariesChangeInEquity
Namespace Prefix: | sbs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The increase (decrease) in the entity's equity resulting from the change in the equity of subsidiaries. + References No definition available. + Details
Name: | sbs_EquityInResultsOfInvestmentsInAffiliates
Namespace Prefix: | sbs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount represents information related to other comprehensive income that will not be reclassified to profit or loss other net of tax. + References No definition available. + Details
Name: | sbs_OtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossOtherNetOfTax
Namespace Prefix: | sbs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Overall total. + References No definition available. + Details
Name: | sbs_OverallTotal
Namespace Prefix: | sbs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount represents information related to profit for year change in equity. + References No definition available. + Details
Name: | sbs_ProfitForYearChangeInEquity
Namespace Prefix: | sbs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Its represents information related to summary of investments. + References No definition available. + Details
Name: | sbs_SummaryOfInvestmentsLineItems
Namespace Prefix: | sbs_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | sbs_TypesOfInvestmentAxis=sbs_OtherInvesteeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | sbs_TypesOfInvestmentAxis=sbs_SaneaquaMairinqueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | sbs_TypesOfInvestmentAxis=sbs_AguasDeCastilhoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | sbs_TypesOfInvestmentAxis=sbs_SeasammMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | sbs_TypesOfInvestmentAxis=sbs_AguasDeAndradinasMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | sbs_TypesOfInvestmentAxis=sbs_AttendAmbientalMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | sbs_TypesOfInvestmentAxis=sbs_AquapoloAmbientalMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | sbs_TypesOfInvestmentAxis=sbs_PaulistaGeradoraDeEnergiasMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | sbs_TypesOfInvestmentAxis=sbs_PaulistaGeradoraDeEnergiaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | sbs_TypesOfInvestmentAxis=sbs_InvesteeTotalMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |