Transactions With Related Parties (Details) - Schedule of Loans and Accounts Receivable as Well as Contingent Loans that Correspond to Related Entities - CLP ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Group entities
Loans and accounts receivable
Commercial loans	$ 954,031	$ 922,232
Mortgage loans	0	0
Consumer loans	0	0
Loans and accounts receivable	954,031	922,232
Allowance for loan losses	(917)	(809)
Net loans	953,114	921,423
Guarantees	0	1,031
Contingent loans
Personal guarantees	0	0
Letters of credit	0	9,787
Guarantees	30,295	20,313
Contingent loans	30,295	30,100
Allowance for contingent loans	(25)	(21)
Net contingent loans	30,270	30,079
Associates entities
Loans and accounts receivable
Commercial loans	7	23,570
Mortgage loans	0	0
Consumer loans	0	0
Loans and accounts receivable	7	23,570
Allowance for loan losses	0	(28)
Net loans	7	23,542
Guarantees	0	0
Contingent loans
Personal guarantees	0	0
Letters of credit	0	0
Guarantees	0	0
Contingent loans	0	0
Allowance for contingent loans	0	0
Net contingent loans	0	0
Key personnel
Loans and accounts receivable
Commercial loans	2,360	2,557
Mortgage loans	31,860	33,179
Consumer loans	3,471	3,729
Loans and accounts receivable	37,691	39,465
Allowance for loan losses	(361)	(498)
Net loans	37,330	38,967
Guarantees	0	31,489
Contingent loans
Personal guarantees	0	0
Letters of credit	0	0
Guarantees	0	0
Contingent loans	0	0
Allowance for contingent loans	0	0
Net contingent loans	0	0
Other
Loans and accounts receivable
Commercial loans	752,827	875
Mortgage loans	0	0
Consumer loans	0	0
Loans and accounts receivable	752,827	875
Allowance for loan losses	(1,539)	0
Net loans	751,288	875
Guarantees	0	110
Contingent loans
Personal guarantees	0	0
Letters of credit	0	0
Guarantees	973	394
Contingent loans	973	394
Allowance for contingent loans	(25)	(8)
Net contingent loans	$ 948	$ 386

Represent information about allowance for contingent loans.

No definition available.

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Balance Type:	credit
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- Definition

Commercial loans.

+ References

No definition available.

+ Details

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Namespace Prefix:	bsac_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Consumer Loans Account Receivable

+ References

No definition available.

+ Details

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Namespace Prefix:	bsac_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Contingent Loans Abstract

+ References

No definition available.

+ Details

Name:	bsac_ContingentLoansAbstract
Namespace Prefix:	bsac_
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Balance Type:	na
Period Type:	duration

- Definition

Amount refers to gross allowance account for credit losses of financial asset.

+ References

No definition available.

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Represent information about gross loan and receivables.

+ References

No definition available.

+ Details

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Namespace Prefix:	bsac_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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- Definition

Guarantees

+ References

No definition available.

+ Details

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Namespace Prefix:	bsac_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Letters Of Credit

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Loans And Accounts Receivable Abstract

+ References

No definition available.

+ Details

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Namespace Prefix:	bsac_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The amounts of net loans and receivables resulting from related party transactions.

+ References

No definition available.

+ Details

Name:	bsac_LoansAndReceivablesRelatedPartyTransactionsNet
Namespace Prefix:	bsac_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Personal Guarantees Loan

+ References

No definition available.

+ Details

Name:	bsac_PersonalGuaranteesLoan
Namespace Prefix:	bsac_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The gross amount of recognised financial assets that are subject either to offsetting or to an enforceable master netting arrangement or similar agreement. [Refer: Financial assets]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2024-01-01
-Paragraph 13C
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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The amount that best represents the entity's maximum exposure to loss from its continuing involvement in derecognised financial assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2024-01-01
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-URIDate 2024-03-27

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

- Definition

The amount of mortgage loans made by the entity.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
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-IssueDate 2024-01-01
-Paragraph 55
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_55&doctype=Standard
-URIDate 2024-03-27

+ Details

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Namespace Prefix:	ifrs-full_
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Balance Type:	debit
Period Type:	instant

- Definition

The net amount of financial assets that are subject either to offsetting or to an enforceable master netting arrangement or similar agreement, presented in the statement of financial position. [Refer: Financial assets]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
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-URIDate 2024-03-27

+ Details

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Data Type:	xbrli:monetaryItemType
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- Details

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Namespace Prefix:
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Balance Type:
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- Details

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