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Transactions With Related Parties (Details) - CLP ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure of related party [text block] [Abstract] |  |  |
Loan with non-controlled companies | $ 1,174 | $ 2,286 | $ 2,059

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- Definition Companies Related party loan amount. + References No definition available. + Details
Name: | bsac_CompaniesRelatedPartyLoanAmount
Namespace Prefix: | bsac_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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