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Fixed Assets and Right of Use Assets and Obligation for Lease Contracts (Details) - Schedule of assets for the right of use leased assets and lease liability - CLP ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Schedule of assets for the right of use leased assets and lease liability [Abstract] |  |
Depreciation | $ 28,899 | $ 27,731
Interests | 2,283 | 2,651
Short term lease | 3,844 | 1,625
Total | $ 35,026 | $ 32,007

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- Definition Interests of lease liability. + References No definition available. + Details
Name: | bsac_LeasedAssetsAndLeaseLiabilityInterests
Namespace Prefix: | bsac_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

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- Definition Short term lease. + References No definition available. + Details
Name: | bsac_ShortTermLease
Namespace Prefix: | bsac_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The amount of depreciation of right-of-use assets. [Refer: Depreciation and amortisation expense; Right-of-use assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2021-01-01 -Paragraph 53 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2021-en-r&anchor=para_53_a&doctype=Standard -URIDate 2021-03-24 + Details
Name: | ifrs-full_DepreciationRightofuseAssets
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of income from subleasing right-of-use assets. Sublease is a transaction for which an underlying asset is re-leased by a lessee (‘intermediate lessor’) to a third party, and the lease (‘head lease’) between the head lessor and lessee remains in effect. [Refer: Right-of-use assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2021-01-01 -Paragraph 53 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2021-en-r&anchor=para_53_f&doctype=Standard -URIDate 2021-03-24 + Details
Name: | ifrs-full_IncomeFromSubleasingRightofuseAssets
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration