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Maturity of Financial Assets and Liabilities (Details) - CLP ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
Maturity of Financial Assets and Liabilities [Abstract] |  |
Debt financial instruments | $ 1,729 | $ 894
Interbank loans | 2 | 1
Loans and account receivable | 1,149,989 | 1,153,266
Subordinated bond | $ 1,813,938 | $ 1,733,869

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- Definition The interbank lending market is a market in which banks lend funds to one another for a specified term. + References No definition available. + Details
Name: | bsac_InterbankLoans
Namespace Prefix: | bsac_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Amount of loans and account receivable from customer. + References No definition available. + Details
Name: | bsac_LoansAndAccountReceivableFromCustomer
Namespace Prefix: | bsac_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The amount of liabilities that are subordinate to other liabilities with respect to claims. + References No definition available. + Details
Name: | bsac_SubordinatedBond
Namespace Prefix: | bsac_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The amount of an allowance account used to record impairments to financial assets due to credit losses. [Refer: Financial assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expired 2023-01-01 -Name IFRS -Number 7 -IssueDate 2023-01-01 -Paragraph 16 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_16&doctype=Standard&book=b -URIDate 2023-03-23 + Details
Name: | ifrs-full_AllowanceAccountForCreditLossesOfFinancialAssets
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | ifrs-full_DisclosureOfMaturityAnalysisForDerivativeFinancialLiabilitiesAbstract
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration