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Transactions With Related Parties (Details) - Schedule of payments to Board members and key management personnel - CLP ($) $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Schedule Of Payments To Board Members And Key Management Personnel Abstract |  |  |  |
Personnel compensation |  | $ 20,280 | $ 16,067 | $ 16,220
Board members’ salaries and expenses |  | 1,692 | 1,539 | 1,452
Bonuses or gratifications |  | 17,794 | 18,458 | 12,583
Stock-based benefits | [1] | (1,169) | (315) | (1,589)
Seniority compensation |  | 6 | 512 | 1,079
Pension plans |  | 849 | (873) | 1,026
Training expenses |  | 50 | 113 | 87
Health funds |  | 357 | 271 | 276
Other personnel expenses |  | 791 | 807 | 827
Total |  | $ 40,650 | $ 36,579 | $ 31,961
[1] | Some of the executives that qualified for this benefit left the Group for different reasons, without complying with the requirements to receive the benefit, therefore the obligation amount decreased, which generated the reversal of provisions.

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- Definition The amount of compensation to key management personnel. [Refer: Key management personnel of entity or parent [member]] + References No definition available. + Details
Name: | bsac_KeyManagementPersonnelCompensation1
Namespace Prefix: | bsac_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount of professional compensation paid to key management. + References No definition available. + Details
Name: | bsac_KeyManagementPersonnelCompensationBoardMembersSalariesAndExpenses
Namespace Prefix: | bsac_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Represent information about key management personnel compensation bonuses or gratifications. + References No definition available. + Details
Name: | bsac_KeyManagementPersonnelCompensationBonusesOrGratifications
Namespace Prefix: | bsac_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Represent information about key management personnel compensation health funds. + References No definition available. + Details
Name: | bsac_KeyManagementPersonnelCompensationHealthFunds
Namespace Prefix: | bsac_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The amount of compensation to key management personnel in the form of other long-term employee benefits. [Refer: Other long-term employee benefits; Key management personnel of entity or parent [member]] + References No definition available. + Details
Name: | bsac_KeyManagementPersonnelCompensationOtherLongtermBenefits1
Namespace Prefix: | bsac_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Represent information about key management personnel compensation personnel compensation. + References No definition available. + Details
Name: | bsac_KeyManagementPersonnelCompensationPersonnelCompensation
Namespace Prefix: | bsac_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Represent information about key management personnel compensation seniority compensation. + References No definition available. + Details
Name: | bsac_KeyManagementPersonnelCompensationSeniorityCompensation
Namespace Prefix: | bsac_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The amount of compensation to key management personnel in the form of share-based benefits. + References No definition available. + Details
Name: | bsac_KeyManagementPersonnelCompensationStockbasedBenefits
Namespace Prefix: | bsac_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Represent information about key management personnel compensation training expenses. + References No definition available. + Details
Name: | bsac_KeyManagementPersonnelCompensationTrainingExpenses
Namespace Prefix: | bsac_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The amount of key management pension plans. + References No definition available. + Details
Name: | bsac_PensionPlans
Namespace Prefix: | bsac_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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