SIGNIFICANT EVENTS (Details) € in Millions, ¥ in Millions, SFr in Millions, $ in Millions, $ in Millions, $ in Millions	12 Months Ended
Dec. 31, 2018 CLP ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2018 EUR (€)	Dec. 31, 2018 JPY (¥)	Dec. 31, 2018 CHF (SFr)	Dec. 31, 2018 AUD ($)	Dec. 31, 2017 CLP ($)
Disclosure of financial liabilities [line items]
Notional amount	$ 241,467,084						$ 177,224,139
Bonds [Member] \| AUD
Disclosure of financial liabilities [line items]
Notional amount						$ 20,000,000
Bonds [Member] \| AUD \| AUD [Member]
Disclosure of financial liabilities [line items]
Currency	AUD	AUD	AUD	AUD	AUD	AUD
Notional amount						$ 20,000,000
Term (annual)	P5Y	P5Y	P5Y	P5Y	P5Y	P5Y
Issuance rate (annual)	3.56%	3.56%	3.56%	3.56%	3.56%	3.56%
Issue date	Nov. 05, 2018	Nov. 05, 2018	Nov. 05, 2018	Nov. 05, 2018	Nov. 05, 2018	Nov. 05, 2018
Maturity date	Nov. 13, 2023	Nov. 13, 2023	Nov. 13, 2023	Nov. 13, 2023	Nov. 13, 2023	Nov. 13, 2023
Bonds [Member] \| CHF
Disclosure of financial liabilities [line items]
Notional amount \| SFr					SFr 115,000,000
Bonds [Member] \| CHF \| CHF [Member]
Disclosure of financial liabilities [line items]
Currency	CHF	CHF	CHF	CHF	CHF	CHF
Notional amount \| SFr					SFr 115,000,000
Term (annual)	P5Y	P5Y	P5Y	P5Y	P5Y	P5Y
Issuance rate (annual)	0.44%	0.44%	0.44%	0.44%	0.44%	0.44%
Issue date	Sep. 04, 2018	Sep. 04, 2018	Sep. 04, 2018	Sep. 04, 2018	Sep. 04, 2018	Sep. 04, 2018
Maturity date	Dec. 21, 2023	Dec. 21, 2023	Dec. 21, 2023	Dec. 21, 2023	Dec. 21, 2023	Dec. 21, 2023
Bonds [Member] \| EUR
Disclosure of financial liabilities [line items]
Notional amount \| €			€ 66,000,000
Bonds [Member] \| EUR \| EUR [Member]
Disclosure of financial liabilities [line items]
Currency	EUR	EUR	EUR	EUR	EUR	EUR
Notional amount \| €			€ 26,000,000
Term (annual)	P7Y	P7Y	P7Y	P7Y	P7Y	P7Y
Issuance rate (annual)	1.00%	1.00%	1.00%	1.00%	1.00%	1.00%
Issue date	May 04, 2018	May 04, 2018	May 04, 2018	May 04, 2018	May 04, 2018	May 04, 2018
Maturity date	May 28, 2025	May 28, 2025	May 28, 2025	May 28, 2025	May 28, 2025	May 28, 2025
Bonds [Member] \| EUR \| EUR 1 [Member]
Disclosure of financial liabilities [line items]
Currency	EUR	EUR	EUR	EUR	EUR	EUR
Notional amount \| €			€ 40,000,000
Term (annual)	P12Y	P12Y	P12Y	P12Y	P12Y	P12Y
Issuance rate (annual)	1.78%	1.78%	1.78%	1.78%	1.78%	1.78%
Issue date	Jun. 08, 2018	Jun. 08, 2018	Jun. 08, 2018	Jun. 08, 2018	Jun. 08, 2018	Jun. 08, 2018
Maturity date	Jun. 15, 2030	Jun. 15, 2030	Jun. 15, 2030	Jun. 15, 2030	Jun. 15, 2030	Jun. 15, 2030
Bonds [Member] \| JPY [Member]
Disclosure of financial liabilities [line items]
Notional amount \| ¥				¥ 7,000,000,000
Bonds [Member] \| JPY [Member] \| JPY [Member]
Disclosure of financial liabilities [line items]
Currency	JPY	JPY	JPY	JPY	JPY	JPY
Notional amount \| ¥				¥ 4,000,000,000
Term (annual)	P10Y6M	P10Y6M	P10Y6M	P10Y6M	P10Y6M	P10Y6M
Issuance rate (annual)	0.65%	0.65%	0.65%	0.65%	0.65%	0.65%
Issue date	Jul. 05, 2018	Jul. 05, 2018	Jul. 05, 2018	Jul. 05, 2018	Jul. 05, 2018	Jul. 05, 2018
Maturity date	Jan. 13, 2029	Jan. 13, 2029	Jan. 13, 2029	Jan. 13, 2029	Jan. 13, 2029	Jan. 13, 2029
Bonds [Member] \| JPY [Member] \| JPY 1 [Member]
Disclosure of financial liabilities [line items]
Currency	JPY	JPY	JPY	JPY	JPY	JPY
Notional amount \| ¥				¥ 3,000,000,000
Term (annual)	P5Y	P5Y	P5Y	P5Y	P5Y	P5Y
Issuance rate (annual)	0.56%	0.56%	0.56%	0.56%	0.56%	0.56%
Issue date	Oct. 23, 2018	Oct. 23, 2018	Oct. 23, 2018	Oct. 23, 2018	Oct. 23, 2018	Oct. 23, 2018
Maturity date	Oct. 23, 2023	Oct. 23, 2023	Oct. 23, 2023	Oct. 23, 2023	Oct. 23, 2023	Oct. 23, 2023
Bonds [Member] \| USD [Member]
Disclosure of financial liabilities [line items]
Notional amount		$ 70,000,000
Bonds [Member] \| USD [Member] \| USD [Member]
Disclosure of financial liabilities [line items]
Currency	USD	USD	USD	USD	USD	USD
Notional amount		$ 50,000,000
Term (annual)	P10Y	P10Y	P10Y	P10Y	P10Y	P10Y
Issuance rate (annual)	3.69%	3.69%	3.69%	3.69%	3.69%	3.69%
Issue date	Oct. 02, 2018	Oct. 02, 2018	Oct. 02, 2018	Oct. 02, 2018	Oct. 02, 2018	Oct. 02, 2018
Maturity date	Oct. 10, 2028	Oct. 10, 2028	Oct. 10, 2028	Oct. 10, 2028	Oct. 10, 2028	Oct. 10, 2028
Bonds [Member] \| USD [Member] \| USD 1 [Member]
Disclosure of financial liabilities [line items]
Currency	USD	USD	USD	USD	USD	USD
Notional amount		$ 20,000,000
Term (annual)	P2Y	P2Y	P2Y	P2Y	P2Y	P2Y
Issuance rate (annual)	4.17%	4.17%	4.17%	4.17%	4.17%	4.17%
Issue date	Nov. 05, 2018	Nov. 05, 2018	Nov. 05, 2018	Nov. 05, 2018	Nov. 05, 2018	Nov. 05, 2018
Maturity date	Nov. 16, 2020	Nov. 16, 2020	Nov. 16, 2020	Nov. 16, 2020	Nov. 16, 2020	Nov. 16, 2020

Refers to borrowing issuance date, in YYYY_MM_DD format.

No definition available.

Name:	bsac_BorrowingsIssueDate
Namespace Prefix:	bsac_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Refers to borrowing maturity date, in YYYY_MM_DD format.

+ References

No definition available.

+ Details

Name:	bsac_BorrowingsMaturityDate
Namespace Prefix:	bsac_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

The interest rate on borrowings. [Refer: Borrowings]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IFRS
-Number 7
-IssueDate 2018-01-01
-Paragraph 7
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_7&doctype=Standard
-URIDate 2018-03-16

+ Details

Name:	ifrs-full_BorrowingsInterestRate
Namespace Prefix:	ifrs-full_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The maturity of borrowings. [Refer: Borrowings]

+ References

+ Details

Name:	ifrs-full_BorrowingsMaturity
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The currency in which the borrowings are denominated. [Refer: Borrowings]

+ References

+ Details

Name:	ifrs-full_BorrowingsOriginalCurrency
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- 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

Name:	ifrs-full_DisclosureOfFinancialLiabilitiesLineItems
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The nominal or face amount of a financial instrument, used to calculate payments made on that instrument.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2018-01-01
-Paragraph 112
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_112_c&doctype=Standard
-URIDate 2018-03-16

+ Details

Name:	ifrs-full_NotionalAmount
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	ifrs-full_ClassesOfFinancialLiabilitiesAxis=bsac_Bonds1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_CurrencyAxis=currency_AUD
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_BorrowingsByNameAxis=bsac_AUD1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_CurrencyAxis=currency_CHF
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_BorrowingsByNameAxis=bsac_CHFMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_CurrencyAxis=currency_EUR
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_BorrowingsByNameAxis=bsac_EURMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_BorrowingsByNameAxis=bsac_EUR1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_CurrencyAxis=currency_JPY
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_BorrowingsByNameAxis=bsac_JPYMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_BorrowingsByNameAxis=bsac_JPY1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_CurrencyAxis=currency_USD
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_BorrowingsByNameAxis=bsac_USDMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_BorrowingsByNameAxis=bsac_USD1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: