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Intangible Assets (Details 2) - CLP ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Disclosure of detailed information about intangible assets [line items]
Accumulated amortization, beginning balance	$ (151,492)	$ (133,840)
Year's amortization	(26,348)	(24,293)
Other changes	1,227	6,641
Accumulated amortization ,ending balance	(176,613)	(151,492)
Licenses [Member]
Disclosure of detailed information about intangible assets [line items]
Accumulated amortization, beginning balance	(37,142)	(36,918)
Year's amortization	(82)	(224)
Other changes	1,227
Accumulated amortization ,ending balance	(35,997)	(37,142)
Software development [Member]
Disclosure of detailed information about intangible assets [line items]
Accumulated amortization, beginning balance	(114,350)	(96,922)
Year's amortization	(26,266)	(24,069)
Other changes		6,641
Accumulated amortization ,ending balance	$ (140,616)	$ (114,350)

X

- Definition

The amount of intangible assets accumulated amortization gross balance.

+ References

No definition available.

+ Details

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Namespace Prefix:	bsac_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Accumulated amortization ncrease (decrease) through other changes of intangible assets and goodwill.

+ References

No definition available.

+ Details

Name:	bsac_AccumulatedAmortizationOtherChanges
Namespace Prefix:	bsac_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The amount of amortisation of intangible assets other than goodwill. [Refer: Depreciation and amortisation expense; Intangible assets other than goodwill]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 38
-IssueDate 2019-01-01
-Paragraph 118
-Subparagraph e
-Clause vi
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=38&code=ifrs-tx-2019-en-r&anchor=para_118_e_vi&doctype=Standard
-URIDate 2019-03-27

+ Details

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

X

- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
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X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: