Financial Liabilities at Amortised Cost (Details) - Schedule of Time Deposits and Other Time Liabilities - CLP ($) $ in Millions	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022
Deposits and other demand liabilities
Deposits and other demand liabilities	$ 13,537,826	$ 14,086,226
Time deposits and other time liabilities
Time deposits and other time liabilities	16,137,942	12,978,790
Obligations under repurchase agreements
Obligations under repurchase agreements	282,584	315,355
Interbank borrowings
Interbank borrowings	10,366,499	8,864,765
Issue debt instruments
Issue debt instruments	8,001,045	7,165,893
Other financial liabilities
Other financial liabilities	296,273	292,995
Total	48,622,169	43,704,024
Checking accounts [Member]
Deposits and other demand liabilities
Deposits and other demand liabilities	11,014,748	11,711,969
Demand accounts [Member]
Deposits and other demand liabilities
Deposits and other demand liabilities	500,723	630,807
Other demand deposits [Member]
Deposits and other demand liabilities
Deposits and other demand liabilities	352,865	379,331
Obligation related to payments cards provision [Member]
Deposits and other demand liabilities
Deposits and other demand liabilities	1,007	6,758
Other demand liabilities [Member]
Deposits and other demand liabilities
Deposits and other demand liabilities	1,668,483	1,357,361
Time deposits [Member]
Time deposits and other time liabilities
Time deposits and other time liabilities	15,939,325	12,779,206
Time savings account [Member]
Time deposits and other time liabilities
Time deposits and other time liabilities	189,757	191,257
Other time liabilities [Member][
Time deposits and other time liabilities
Time deposits and other time liabilities	8,860	8,327
Operation with foreign banks [Member]
Obligations under repurchase agreements
Obligations under repurchase agreements		103,425
Operation with other Chilean entities [Member]
Obligations under repurchase agreements
Obligations under repurchase agreements	282,584	211,930
Loans from chilean financial institutions [Member]
Interbank borrowings
Interbank borrowings	46,218	41,317
Loans from foreign financial institutions [Member]
Interbank borrowings
Interbank borrowings	4,271,414	3,239,358
Loans from Chilean Central Bank [Member]
Interbank borrowings
Interbank borrowings	6,048,867	5,584,090
Mortgage Finance Bonds [Member]
Issue debt instruments
Issue debt instruments	1,229	3,798
Senior Bonds [Member]
Issue debt instruments
Issue debt instruments	7,925,385	7,080,472
Mortgage Bonds [Member]
Issue debt instruments
Issue debt instruments	74,431	81,623
Other Domestic Obligations [Member]
Other financial liabilities
Other financial liabilities	$ 296,273	292,417
Foreign Obligations [Member]
Other financial liabilities
Other financial liabilities		$ 578

No definition available.

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

- References

No definition available.

+ Details

Name:	bsac_InterbankBorrowingsAbstract1
Namespace Prefix:	bsac_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- References

No definition available.

+ Details

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

- Definition

Obligations under repurchase agreements.

+ References

No definition available.

+ Details

Name:	bsac_ObligationsUnderRepurchaseAgreements
Namespace Prefix:	bsac_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- References

No definition available.

+ Details

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

- References

No definition available.

+ Details

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

- Definition

Represent information about time deposits and other time liabilities.

+ References

No definition available.

+ Details

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

- References

No definition available.

+ Details

Name:	bsac_TimeDepositsAndOtherTimeLiabilitiesAbstract2
Namespace Prefix:	bsac_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Total of time deposits and other time liabilities.

+ References

No definition available.

+ Details

Name:	bsac_TotalTimeDepositsAndOtherTimeLiabilities
Namespace Prefix:	bsac_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- 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 2023-01-01
-Paragraph 112
-Subparagraph c
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_112_c&doctype=Standard
-URIDate 2023-03-23

+ Details

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

- Definition

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

+ References

+ Details

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

- Definition

The amount of debt instruments held by the entity that it does not separately disclose in the same statement or note. [Refer: Debt instruments held]

+ References

+ Details

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

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2023-01-01
-Paragraph 54
-Subparagraph m
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_54_m&doctype=Standard
-URIDate 2023-03-23

+ Details

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

- Details

Name:	ifrs-full_TypesOfFinancialLiabilitiesAxis=bsac_CheckingAccountsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_TypesOfFinancialLiabilitiesAxis=bsac_DemandAccountsAccountsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_TypesOfFinancialLiabilitiesAxis=bsac_OtherDemandDepositsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_TypesOfFinancialLiabilitiesAxis=bsac_ObligationRelatedToPaymentsCardsProvisionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_TypesOfFinancialLiabilitiesAxis=bsac_OtherDemandLiabilitiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_TypesOfFinancialLiabilitiesAxis=bsac_TimeDepositsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_TypesOfFinancialLiabilitiesAxis=bsac_TimeSavingsAccountMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_TypesOfFinancialLiabilitiesAxis=bsac_OtherTimeLiabilitiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_TypesOfFinancialLiabilitiesAxis=bsac_OperationWithForeignBanksMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_TypesOfFinancialLiabilitiesAxis=bsac_OperationWithOtherChileanEntitiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_TypesOfFinancialLiabilitiesAxis=bsac_chileanFinancialInstitutionsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_TypesOfFinancialLiabilitiesAxis=bsac_ForeignFinancialInstitutionsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_TypesOfFinancialLiabilitiesAxis=bsac_ChileanCentralBankMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_TypesOfFinancialLiabilitiesAxis=bsac_MortgageFinanceBondsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_TypesOfFinancialLiabilitiesAxis=bsac_SeniorBondsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_TypesOfFinancialLiabilitiesAxis=bsac_MortgageBondsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_TypesOfFinancialLiabilitiesAxis=bsac_OtherDomesticObligationsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_TypesOfFinancialLiabilitiesAxis=bsac_ForeignObligationsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: