Transactions With Related Parties (Details) - Schedule of Assets and Liabilities With Related Parties - CLP ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Assets
Cash and deposits in banks	$ 1,227,700	$ 1,198,568
Financial assets at FVTPL
Financial derivative contracts	12,309,770	10,119,486
Other assets	2,535,775	3,046,607
Financial liabilities at FVTPL
Financial derivative contracts	12,155,024	9,521,575
Financial liabilities at amortised cost
Deposits and other demand liabilities	14,260,609	13,537,826
Obligations under repurchase agreements	276,588	282,584
Issued debt instruments	8,133,275	8,001,045
Other financial liabilities	59,757,340	64,385,273
Group entities
Assets
Cash and deposits in banks	162,452	666,062	$ 280,364
Financial assets at FVTPL
Financial derivative contracts	1,120,543	967,020	1,190,683
Other assets	885,307	686,950	676,850
Financial liabilities at FVTPL
Financial derivative contracts	1,757,184	1,255,740	1,695,284
Financial liabilities at amortised cost
Deposits and other demand liabilities	28,446	54,033	73,193
Time deposits and other time liabilities	140,475	145,649	10,376
Obligations under repurchase agreements	265,474	129,321	64,547
Interbank borrowing	85,325	33,693	224,798
Issued debt instruments	941,320	1,081,123	1,001,310
Other financial liabilities	236,998	257,915	267,130
Associates entities
Assets
Cash and deposits in banks	0	0	0
Financial assets at FVTPL
Financial derivative contracts	11,134	267,679	386,494
Other assets	686,884	550,400	287,053
Financial liabilities at FVTPL
Financial derivative contracts	13,143	370,314	326,149
Financial liabilities at amortised cost
Deposits and other demand liabilities	1,007	1,272	0
Time deposits and other time liabilities	0	0	0
Obligations under repurchase agreements	0	0	0
Interbank borrowing	0	0	0
Issued debt instruments	0	0	0
Other financial liabilities	664,461	435,093	325,070
Key personnel
Assets
Cash and deposits in banks	0	0	0
Financial assets at FVTPL
Financial derivative contracts	0	0	0
Other assets	0	0	0
Financial liabilities at FVTPL
Financial derivative contracts	0	0	0
Financial liabilities at amortised cost
Deposits and other demand liabilities	3,260	3,833	4,398
Time deposits and other time liabilities	4,996	9,894	9,442
Obligations under repurchase agreements	0	0	0
Interbank borrowing	0	0	0
Issued debt instruments	0	0	0
Other financial liabilities	0	0	0
Other
Assets
Cash and deposits in banks	0	0	0
Financial assets at FVTPL
Financial derivative contracts	0	0	0
Other assets	0	0	0
Financial liabilities at FVTPL
Financial derivative contracts	0	0	0
Financial liabilities at amortised cost
Deposits and other demand liabilities	407	502	833
Time deposits and other time liabilities	69	1,589	1,102
Obligations under repurchase agreements	0	0	18,135
Interbank borrowing	0	0	0
Issued debt instruments	0	0	0
Other financial liabilities	$ 0	$ 0	$ 0

Assets Abstract0

No definition available.

Name:	bsac_AssetsAbstract0
Namespace Prefix:	bsac_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Financial Assets At Fvtpl Abstract

+ References

No definition available.

+ Details

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

- Definition

Financial Liabilities At Amortised Cost Abstract3

+ References

No definition available.

+ Details

Name:	bsac_FinancialLiabilitiesAtAmortisedCostAbstract3
Namespace Prefix:	bsac_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Financial Liabilities At Fvtpl Abstract

+ References

No definition available.

+ Details

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

- Definition

Interbank Borrowing

+ References

No definition available.

+ Details

Name:	bsac_InterbankBorrowing
Namespace Prefix:	bsac_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The amount of balances in customers' demand deposits held by the entity.

+ 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

+ Details

Name:	ifrs-full_BalancesOnDemandDepositsFromCustomers
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The amount of balances in customers' term deposits held by the entity.

+ References

+ Details

Name:	ifrs-full_BalancesOnTermDepositsFromCustomers
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The amount of cash on hand and demand deposits. [Refer: Cash on hand]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 7
-IssueDate 2024-01-01
-Paragraph 45
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2024-en-r&anchor=para_45&doctype=Standard
-URIDate 2024-03-27

+ Details

Name:	ifrs-full_Cash
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The amount of instruments issued by the entity that represent indebtedness.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-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

Name:	ifrs-full_DebtSecurities
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The amount of financial assets classified as derivative instruments. [Refer: Financial assets; Derivatives [member]]

+ References

+ Details

Name:	ifrs-full_DerivativeFinancialAssets
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The amount of financial liabilities classified as derivative instruments. [Refer: Financial assets; Derivatives [member]]

+ References

+ Details

Name:	ifrs-full_DerivativeFinancialLiabilities
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The amount of liabilities that are: (a) a contractual obligation: (i) to deliver cash or another financial asset to another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially unfavourable to the entity; or (b) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to deliver a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose, rights, options or warrants to acquire a fixed number of the entity’s own equity instruments for a fixed amount of any currency are equity instruments if the entity offers the rights, options or warrants pro rata to all of its existing owners of the same class of its own non-derivative equity instruments. Also, for those purposes the entity’s own equity instruments do not include puttable financial instruments that are classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. As an exception, an instrument that meets the definition of a financial liability is classified as an equity instrument if it has all the features and meets the conditions in paragraphs 16A-16B or paragraphs 16C-16D of IAS 32. [Refer: Classes of financial instruments [domain]; Financial assets; Derivatives [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2024-01-01
-Paragraph 25
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_25&doctype=Standard
-URIDate 2024-03-27

+ Details

Name:	ifrs-full_FinancialLiabilities
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The amount of financial assets that the entity does not separately disclose in the same statement or note. [Refer: Financial assets]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2024-01-01
-Paragraph 54
-Subparagraph d
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_54_d&doctype=Standard
-URIDate 2024-03-27

+ Details

Name:	ifrs-full_OtherFinancialAssets
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The amount of instruments sold with the intent to reacquire in repurchase agreements and cash collateral on securities lent.

+ References

+ Details

Name:	ifrs-full_RepurchaseAgreementsAndCashCollateralOnSecuritiesLent
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	ifrs-full_CategoriesOfRelatedPartiesAxis=bsac_CompaniesOfTheGroupMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_CategoriesOfRelatedPartiesAxis=ifrs-full_AssociatesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_CategoriesOfRelatedPartiesAxis=ifrs-full_KeyManagementPersonnelOfEntityOrParentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_CategoriesOfRelatedPartiesAxis=ifrs-full_OtherRelatedPartiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: