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Fixed Assets and Right of Use Assets and Lease Liability (Details 8) - CLP ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Fixed Assets And Right Of Use Assets And Lease Liability
Depreciation	$ (26,889)
Interests	(2,965)
Short term lease	(4,177)
Total	$ (34,031)

X

- References

No definition available.

+ Details

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

X

- Definition

Interests of lease liability.

+ References

No definition available.

+ Details

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

X

- Definition

Short term lease.

+ References

No definition available.

+ Details

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

X

- Definition

The amount of depreciation of right-of-use assets. [Refer: Depreciation and amortisation expense; Right-of-use assets]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 16
-IssueDate 2019-01-01
-Paragraph 53
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2019-en-r&anchor=para_53_a&doctype=Standard
-URIDate 2019-03-27

+ Details

Name:	ifrs-full_DepreciationRightofuseAssets
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The amount of income from subleasing right-of-use assets. Sublease is a transaction for which an underlying asset is re-leased by a lessee (‘intermediate lessor’) to a third party, and the lease (‘head lease’) between the head lessor and lessee remains in effect. [Refer: Right-of-use assets]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 16
-IssueDate 2019-01-01
-Paragraph 53
-Subparagraph f
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2019-en-r&anchor=para_53_f&doctype=Standard
-URIDate 2019-03-27

+ Details

Name:	ifrs-full_IncomeFromSubleasingRightofuseAssets
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration