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Contingencies and Commitments (Details) - Schedule of contractual obligations - CLP ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
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Schedule of contractual obligations [Abstract] |  |
Letters of credit issued | $ 323,531 | $ 165,119
Foreign letters of credit confirmed | 53,777 | 82,779
Performance guarantee | 1,390,410 | 1,090,643
Personal guarantees | 579,051 | 441,508
Total contingent liabilities | 2,346,769 | 1,780,049
Available on demand credit lines | 8,986,535 | 8,391,414
Other irrevocable credit commitments | 265,517 | 406,234
Total loan commitment | 9,252,052 | 8,797,648
Total | $ 11,598,821 | $ 10,577,697

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- Definition Represent information about available on demand credit lines. + References No definition available. + Details
Name: | bsac_AvailableOnDemandCreditLines
Namespace Prefix: | bsac_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Amount refers to contingents liabilities regonised loans loss allowance. + References No definition available. + Details
Name: | bsac_ContingentsLiabilitiesRegonisedLoansLossAllowance
Namespace Prefix: | bsac_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Represent information about foreign letters of credit confirmed contractual obligations. + References No definition available. + Details
Name: | bsac_ForeignLettersOfCreditConfirmedContractualObligations
Namespace Prefix: | bsac_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Represent information about gross contractual obligations toissue loans. + References No definition available. + Details
Name: | bsac_GrossContractualObligationsToIssueLoans
Namespace Prefix: | bsac_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Represent information about guarantees contractual obligations. + References No definition available. + Details
Name: | bsac_GuaranteesContractualObligations
Namespace Prefix: | bsac_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represent information about letters of credit issued contractual obligations. + References No definition available. + Details
Name: | bsac_LettersOfCreditIssuedContractualObligations
Namespace Prefix: | bsac_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represent information about other irrevocable credit commitments. + References No definition available. + Details
Name: | bsac_OtherIrrevocableCreditCommitments
Namespace Prefix: | bsac_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represent information about personal guarantees contractual obligations. + References No definition available. + Details
Name: | bsac_PersonalGuaranteesContractualObligations
Namespace Prefix: | bsac_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- References No definition available. + Details
Name: | bsac_ScheduleOfContractualObligationsAbstract
Namespace Prefix: | bsac_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represent information about total contractual obligations to issue loans. + References No definition available. + Details
Name: | bsac_TotalContractualObligationsToIssueLoans
Namespace Prefix: | bsac_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant