The amount of assets derecognised or matured excluding write offs.

No definition available.

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

- Definition

The amount of changes due to modifications not derecognised.

+ References

No definition available.

+ Details

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

- Definition

Amount of transfers of financial instruments classified in stages 1.

+ References

No definition available.

+ Details

Name:	bsac_DebtStage1TransfersAmount
Namespace Prefix:	bsac_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of transfers of financial instruments classified in stages 2.

+ References

No definition available.

+ Details

Name:	bsac_DebtStage2TransfersAmount
Namespace Prefix:	bsac_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of transfers of financial instruments classified in stages 3.

+ References

No definition available.

+ Details

Name:	bsac_DebtStage3TransfersAmount
Namespace Prefix:	bsac_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The amount of debt writte off.

+ References

No definition available.

+ Details

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

- Definition

The amount of foreign exchange adjustments.

+ References

No definition available.

+ Details

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

- Definition

The amount of new assets purchased.

+ References

No definition available.

+ Details

Name:	bsac_NewAssetsPurchased
Namespace Prefix:	bsac_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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_DisclosureOfFinancialAssetsLineItems
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The amount of non-derivative financial assets that are designated as available for sale or are not classified as (a) loans and receivables; (b) held-to-maturity investments; or (c) financial assets at fair value through profit or loss. [Refer: Derivative financial assets; Financial assets at fair value through profit or loss; Held-to-maturity investments]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Expiry date 2021-01-01
-Name IFRS
-Number 7
-IssueDate 2019-01-01
-Paragraph 8
-Subparagraph d
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_8_d&doctype=Standard&book=b
-URIDate 2019-03-27

+ Details

Name:	ifrs-full_FinancialAssetsAvailableforsale
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The amount of financial assets that are measured at fair value through other comprehensive income. A financial asset shall be measured at fair value through other comprehensive income if both of the following conditions are met: (a) the financial asset is held within a business model whose objective is achieved by both collecting contractual cash flows and selling financial assets and (b) the contractual terms of the financial asset give rise on specified dates to cash flows that are solely payments of principal and interest on the principal amount outstanding. [Refer: At fair value [member]; Financial assets]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2019-01-01
-Paragraph 8
-Subparagraph h
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_8_h&doctype=Standard
-URIDate 2019-03-27

+ Details

Name:	ifrs-full_FinancialAssetsMeasuredAtFairValueThroughOtherComprehensiveIncome
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	bsac_ExpectedCreditLossesAxis=bsac_ExpectedCreditLossesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	bsac_ExpectedCreditLossesStagesAxis=bsac_ExpectedCreditLossesStage1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	bsac_ExpectedCreditLossesStagesAxis=bsac_ExpectedCreditLossesStage2Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	bsac_ExpectedCreditLossesStagesAxis=bsac_ExpectedCreditLossesStage3Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Debt Instruments at Fair Value Through Other Comprehensive Income (Details 1) - CLP ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Disclosure of financial assets [line items]
Beginning balance	$ 2,394,323	$ 2,574,546
New assets purchased	7,573,665	5,037,857
Transfers to stage 1
Transfers to stage 2
Transfers to stage 3
Assets derecognised or matured (excluding write offs)	(5,694,456)	(5,604,114)
Changes due to modifications not derecognised	394,648
Write-off
Foreign Exchange adjustments and others	(657,908)	386,034
Ending balance	4,010,272	2,394,323
ECL [Member]
Disclosure of financial assets [line items]
Beginning balance	258	324
New assets purchased	816	634
Transfers to stage 1
Transfers to stage 2
Transfers to stage 3
Assets derecognised or matured (excluding write offs)	(614)	(705)
Changes due to modifications not derecognised	67
Write-off
Foreign Exchange adjustments and others	(71)	5
Ending balance	456	258
Expected Credit Losses Stage1 [Member]
Disclosure of financial assets [line items]
Beginning balance	2,394,323	2,574,546
New assets purchased	7,573,665	5,037,857
Transfers to stage 1
Transfers to stage 2
Transfers to stage 3
Assets derecognised or matured (excluding write offs)	(5,694,456)	(5,604,114)
Changes due to modifications not derecognised	394,648
Write-off
Foreign Exchange adjustments and others	(657,908)	386,034
Ending balance	4,010,272	2,394,323
Expected Credit Losses Stage1 [Member] \| ECL [Member]
Disclosure of financial assets [line items]
Beginning balance	258	324
New assets purchased	816	634
Transfers to stage 1
Transfers to stage 2
Transfers to stage 3
Assets derecognised or matured (excluding write offs)	(614)	(705)
Changes due to modifications not derecognised	67
Write-off
Foreign Exchange adjustments and others	(71)	5
Ending balance	456	258
Expected Credit Losses Stage2 [Member]
Disclosure of financial assets [line items]
Beginning balance
New assets purchased
Transfers to stage 1
Transfers to stage 2
Transfers to stage 3
Assets derecognised or matured (excluding write offs)
Changes due to modifications not derecognised
Write-off
Foreign Exchange adjustments and others
Ending balance
Expected Credit Losses Stage2 [Member] \| ECL [Member]
Disclosure of financial assets [line items]
Beginning balance
New assets purchased
Transfers to stage 1
Transfers to stage 2
Transfers to stage 3
Assets derecognised or matured (excluding write offs)
Changes due to modifications not derecognised
Write-off
Foreign Exchange adjustments and others
Ending balance
Expected Credit Losses Stage3 [Member]
Disclosure of financial assets [line items]
Beginning balance
New assets purchased
Transfers to stage 1
Transfers to stage 2
Transfers to stage 3
Assets derecognised or matured (excluding write offs)
Changes due to modifications not derecognised
Write-off
Foreign Exchange adjustments and others
Ending balance
Expected Credit Losses Stage3 [Member] \| ECL [Member]
Disclosure of financial assets [line items]
Beginning balance
New assets purchased
Transfers to stage 1
Transfers to stage 2
Transfers to stage 3
Assets derecognised or matured (excluding write offs)
Changes due to modifications not derecognised
Write-off
Foreign Exchange adjustments and others
Ending balance