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Transactions With Related Parties (Details) - CLP ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disclosure of related party [text block] [Abstract]
Loan with non-controlled companies	$ 1,174	$ 2,286	$ 2,059

X

- Definition

Companies Related party loan amount.

+ References

No definition available.

+ Details

Name:	bsac_CompaniesRelatedPartyLoanAmount
Namespace Prefix:	bsac_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	bsac_DisclosureOfRelatedPartyTextBlockAbstract
Namespace Prefix:	bsac_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration