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Risk Management (Details) - Schedule of financial assets and associated collateral - Credit risk [member] - CLP ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
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Risk Management (Details) - Schedule of financial assets and associated collateral [Line Items] |  |
Maximum exposure to credit risk | $ 36,599,747 | $ 34,410,578
Collateral | 24,122,733 | 22,471,455
Net exposure | 12,477,014 | 11,939,123
Associated ECL | 1,050,080 | 1,038,147
Commercial loans [Member] |  |
Risk Management (Details) - Schedule of financial assets and associated collateral [Line Items] |  |
Maximum exposure to credit risk | 17,724,326 | 17,057,874
Collateral | 10,171,168 | 9,887,154
Net exposure | 7,553,158 | 7,170,720
Associated ECL | 602,011 | 646,426
Mortgage Loans [Member] |  |
Risk Management (Details) - Schedule of financial assets and associated collateral [Line Items] |  |
Maximum exposure to credit risk | 13,876,174 | 12,411,825
Collateral | 13,331,941 | 11,931,235
Net exposure | 544,233 | 480,590
Associated ECL | 143,658 | 112,522
Consumer Loans [Member] |  |
Risk Management (Details) - Schedule of financial assets and associated collateral [Line Items] |  |
Maximum exposure to credit risk | 4,999,247 | 4,940,879
Collateral | 619,624 | 653,066
Net exposure | 4,379,623 | 4,287,813
Associated ECL | $ 304,411 | $ 279,199

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- Definition Amount refers to expected credit loss allowance collateral. + References No definition available. + Details
Name: | bsac_ExpectedCreditLossAllowanceCollateral
Namespace Prefix: | bsac_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Amount refers to expected credit loss allowance net exposure. + References No definition available. + Details
Name: | bsac_ExpectedCreditLossAllowanceNetExposure
Namespace Prefix: | bsac_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Amount refers to gross allowance account for credit losses of financial asset. + References No definition available. + Details
Name: | bsac_GrossAllowanceAccountForCreditLossesOfFinancialAssets
Namespace Prefix: | bsac_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | bsac_RiskManagementDetailsScheduleoffinancialassetsandassociatedcollateralLineItems
Namespace Prefix: | bsac_
Data Type: | xbrli:stringItemType
Balance Type: | na
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 Expiry date 2023-01-01 -Name IFRS -Number 7 -IssueDate 2021-01-01 -Paragraph 16 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_16&doctype=Standard&book=b -URIDate 2021-03-24 + Details
Name: | ifrs-full_AllowanceAccountForCreditLossesOfFinancialAssets
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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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_CommercialLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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