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Fee and commission expenses (Details) - BRL (R$) R$ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Fee And Commission Expenses
Commissions assigned to third parties (1)	R$ 5,055,514	R$ 4,541,274	R$ 4,147,976
Other fees and commissions	2,970,877	1,918,504	2,666,837
Total	R$ 8,026,391	R$ 6,459,778	R$ 6,814,813

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- References

No definition available.

+ Details

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- References

No definition available.

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Name:	bsbr_FeeAndCommissionExpenses
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- Definition

The amount of expense recognised for brokerage fees charged to the entity.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2024-01-01
-Paragraph 112
-Subparagraph c
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-URIDate 2024-03-27

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- Definition

The amount of fee and commission expense that the entity does not separately disclose in the same statement or note. [Refer: Fee and commission expense]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2024-01-01
-Paragraph 112
-Subparagraph c
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_112_c&doctype=Standard
-URIDate 2024-03-27

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