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Expected Credit Losses Allowance (Details) - CLP ($) $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2020
Expected Credit Losses Allowance [Abstract] |  |
Expected credit loss related to macroeconomically scenarios | $ 91,351 | $ 59,000

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

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- Definition Amount of expected credit loss allowances related to macroeconomy. + References No definition available. + Details
Name: | bsac_ExpectedCreditLossAllowancesRelatedToMacroeconomy
Namespace Prefix: | bsac_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration