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Risk Management (Details) - Schedule of security interests, collateral, or credit improvements - Credit risk [member] - CLP ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Non-impaired financial assets: |  |
Total | $ 30,612,061 | $ 29,344,459
Properties/mortgages [Member] | Non-impaired financial assets [Member] |  |
Non-impaired financial assets: |  |
Total | 27,013,636 | 25,424,161
Properties/mortgages [Member] | Impaired financial assets [Member] |  |
Non-impaired financial assets: |  |
Total | 1,715,628 | 1,548,568
Investments and others [Member] | Non-impaired financial assets [Member] |  |
Non-impaired financial assets: |  |
Total | 1,813,714 | 2,306,062
Investments and others [Member] | Impaired financial assets [Member] |  |
Non-impaired financial assets: |  |
Total | $ 69,083 | $ 65,668

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- Definition The amount of collateral held as security and other credit enhancements, and their financial effect (for example, a quantification of the extent to which collateral and other credit enhancements mitigate credit risk) in respect of the amount that best represents the maximum exposure to credit risk. + References No definition available. + Details
Name: | bsac_CollateralHeldAsSecurityAndOtherCreditEnhancements
Namespace Prefix: | bsac_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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- Details
Name: | ifrs-full_TypesOfRisksAxis=ifrs-full_CreditRiskMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_ClassesOfFinancialAssetsAxis=bsac_PropertiesAndMortgagesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_CreditImpairmentOfFinancialInstrumentsAxis=ifrs-full_FinancialInstrumentsNotCreditimpairedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_CreditImpairmentOfFinancialInstrumentsAxis=ifrs-full_FinancialInstrumentsCreditimpairedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_ClassesOfFinancialAssetsAxis=bsac_InvestmentsAndOthersMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |