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10 Trade receivables (Details 3) - BRL (R$) R$ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Trade Receivables
Write-offs	R$ (329,512)	R$ (179,929)	R$ (184,555)
(Losses)/reversal with state entities - related parties	290	(5,597)	1,294
(Losses) with private sector / government entities	(176,776)	(54,064)	(61,315)
(Losses)/reversal with wholesale customers	0	0	(29,458)
Recoveries	61,172	111,491	107,307
Amount recorded expense	R$ (444,826)	R$ (128,099)	R$ (166,727)

X

- Definition

Adjustments for impairment loss (reversal of impairment loss) recognised in profit or loss to reconcile profit (loss) to net cash flow from (used in) operating activities. [Refer: Impairment loss (reversal of impairment loss) recognised in profit or loss]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 7
-IssueDate 2020-01-01
-Paragraph 20
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2020-en-r&anchor=para_20_b&doctype=Standard
-URIDate 2020-01-01

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Balance Type:	debit
Period Type:	duration

X

- Definition

The amount represents information related to expense recognised during period for bad and doubtful debts for related party transaction state entities related parties.

+ References

No definition available.

+ Details

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Namespace Prefix:	sbs_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The amount represents information related to expense recognised during period for bad and doubtful debts for transaction with private sector.

+ References

No definition available.

+ Details

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Namespace Prefix:	sbs_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The amount represents information related to expense recognised during period for bad and doubtful debts for transaction with wholesale customers.

+ References

No definition available.

+ Details

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Namespace Prefix:	sbs_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The amount represents information related to recoveries recognized in bad debt expense.

+ References

No definition available.

+ Details

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Namespace Prefix:	sbs_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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- References

No definition available.

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Namespace Prefix:	sbs_
Data Type:	xbrli:stringItemType
Balance Type:	na
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X

- Definition

The amount represents information related to writeoffs during period for bad and doubtful debts for third party transaction.

+ References

No definition available.

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Data Type:	xbrli:monetaryItemType
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