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Other Operating Income and Expenses (Details) - Schedule of other operating income - CLP ($) | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Schedule of other operating income [Abstract] |  |  |  |
Income from assets received in lieu of payment |  | $ 5,479 | $ 5,934 | $ 5,613
Release of contingencies provisions |  |  | 503 |
Other income |  | 4,912 | 1,769 | 7,388
Income from sale of property, plant and equipment |  | 673 | 865 | 2,456
Pension plan interest |  | 640 |  |
Compensation from insurance companies due to damages | [1] | 45 | 255 | 4,681
Rental income |  | 286 | 253 |
Operational risk expense recovery |  | 2,389 |  |
Tax recovery |  | 214 | 250 |
Income from business alliance |  | 440 | 72 |
Other |  | 225 | 74 | 251
Total |  | $ 10,391 | $ 8,206 | $ 13,001
[1] | Mainly related to recoveries from fraud claims.

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- Definition Amount of compensation from insurance companies due to damages. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Amount of income from assets received in lieu of payment. + References No definition available. + Details
Name: | bsac_IncomeFromAssetsReceivedInLieuOfPayment
Namespace Prefix: | bsac_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Income from business alliance. + References No definition available. + Details
Name: | bsac_IncomeFromBusinessAlliance
Namespace Prefix: | bsac_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of income from sale of property, plant and equipment. + References No definition available. + Details
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Namespace Prefix: | bsac_
Data Type: | xbrli:monetaryItemType
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Period Type: | duration

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- Definition Operational risk expense recovery. + References No definition available. + Details
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Namespace Prefix: | bsac_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of gross other operating income. + References No definition available. + Details
Name: | bsac_OtherOperatingIncomeGross
Namespace Prefix: | bsac_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Pension plan interest. + References No definition available. + Details
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Namespace Prefix: | bsac_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of released of contingencies provisions. + References No definition available. + Details
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Namespace Prefix: | bsac_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

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- References No definition available. + Details
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Namespace Prefix: | bsac_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount of miscellaneous other operating income. [Refer: Other operating income (expense)] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_112_c&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The amount of income recognised from rental activities. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_112_c&doctype=Standard -URIDate 2021-03-24 + Details
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