Name:	bsac_MinimumDividendProvisionOfAccumulatedEarningsPercentage
Namespace Prefix:	bsac_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

PDEqual Percentage

+ References

No definition available.

+ Details

Name:	bsac_PDEqualPercentage
Namespace Prefix:	bsac_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of combined assets of all the operating segments.

+ References

No definition available.

+ Details

Name:	bsac_PercentageOfCombinedAssetsOfOperatingSegments
Namespace Prefix:	bsac_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The percentage of the entity's revenue. [Refer: Revenue]

+ References

No definition available.

+ Details

Name:	bsac_PercentageOfEntityRevenue
Namespace Prefix:	bsac_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of inflation.

+ References

No definition available.

+ Details

Name:	bsac_PercentageOfInflation
Namespace Prefix:	bsac_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Summary of Significant Accounting Policies [Line Items]

+ References

No definition available.

+ Details

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

- Definition

Terms of employee benefits.

+ References

No definition available.

+ Details

Name:	bsac_TermsOfEmployeeBenefits
Namespace Prefix:	bsac_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

The spot exchange rate at the end of the reporting period. Exchange rate is the ratio of exchange for two currencies. Spot exchange rate is the exchange rate for immediate delivery.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2024-01-01
-Paragraph 112
-Subparagraph c
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_112_c&doctype=Standard
-URIDate 2024-03-27

+ Details

Name:	ifrs-full_ClosingForeignExchangeRate
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

- Definition

The effective interest rate for financial assets reclassified out of fair value through profit or loss category into amortised cost or fair value through other comprehensive income category as of the date of reclassification. [Refer: Financial assets]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2024-01-01
-Paragraph 12C
-Subparagraph a
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_12C_a&doctype=Standard
-URIDate 2024-03-27

+ Details

Name:	ifrs-full_DescriptionOfEffectiveInterestRateDeterminedOnDateOfReclassification
Namespace Prefix:	ifrs-full_
Data Type:	dtr-2022:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The amount of tangible assets that: (a) are held for use in the production or supply of goods or services, for rental to others, or for administrative purposes; and (b) are expected to be used during more than one period. Note that right-of-use assets are not included. [Contrast: Property, plant and equipment including right-of-use assets]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 16
-IssueDate 2024-01-01
-Paragraph 73
-Subparagraph e
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=16&code=ifrs-tx-2024-en-r&anchor=para_73_e&doctype=Standard
-URIDate 2024-03-27

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2024-01-01
-Paragraph 54
-Subparagraph a
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_54_a&doctype=Standard
-URIDate 2024-03-27

+ Details

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

- Definition

The proportion of ownership interest in a subsidiary attributable to the entity. [Refer: Total for all subsidiaries [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 27
-IssueDate 2024-01-01
-Paragraph 17
-Subparagraph b
-Clause iii
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=27&code=ifrs-tx-2024-en-r&anchor=para_17_b_iii&doctype=Standard
-URIDate 2024-03-27

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 27
-IssueDate 2024-01-01
-Paragraph 16
-Subparagraph b
-Clause iii
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=27&code=ifrs-tx-2024-en-r&anchor=para_16_b_iii&doctype=Standard
-URIDate 2024-03-27

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 12
-IssueDate 2024-01-01
-Paragraph 19B
-Subparagraph c
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2024-en-r&anchor=para_19B_c&doctype=Standard
-URIDate 2024-03-27

+ Details

Name:	ifrs-full_ProportionOfOwnershipInterestInSubsidiary
Namespace Prefix:	ifrs-full_
Data Type:	dtr-2022:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The useful life, measured as period of time, used for intangible assets other than goodwill. [Refer: Intangible assets other than goodwill]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 38
-IssueDate 2024-01-01
-Paragraph 118
-Subparagraph a
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=38&code=ifrs-tx-2024-en-r&anchor=para_118_a&doctype=Standard
-URIDate 2024-03-27

+ Details

Name:	ifrs-full_UsefulLifeMeasuredAsPeriodOfTimeIntangibleAssetsOtherThanGoodwill
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	ifrs-full_AssetsAndLiabilitiesClassifiedAsHeldForSaleAxis=ifrs-full_NoncurrentAssetsHeldForSaleMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_TypeOfMeasurementOfExpectedCreditLossesAxis=ifrs-full_LifetimeExpectedCreditLossesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	bsac_TypesOfCurrencyAxis=bsac_CLFMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_CategoriesOfRelatedPartiesAxis=bsac_BancoSantanderSpainMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=bsac_BancoSantanderChileMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=bsac_TeatinosSigloXXiInversionesLtdaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=bsac_SantanderChileBankMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Summary of Significant Accounting Policies (Details) - Narrative	1 Months Ended		12 Months Ended
	Sep. 30, 2024	May 31, 2024	Dec. 31, 2025 CLP ($)	Dec. 31, 2024 CLP ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 CLP ($)
Summary of Significant Accounting Policies [Line Items]
Percentage of inflation			4.40%	4.80%	4.80%
Revenue of operating segments, percentage			10.00%
Profit or loss, percentage			10.00%			10.00%
Percentage of combined assets operating segments			10.00%
Foreign exchange rate			$ 900.69	$ 994.10	$ 1
Average incremental interest rate			1.70%
Useful life measured as period of time, intangible assets other than goodwill			36 months
PD equal percentage			100.00%
Property, plant, and equipment			$ 242,522,000,000	$ 251,846,000,000				$ 251,823,000,000
Average cost to sale, percentage			7.15%	5.67%	5.67%
Minimum dividend provision of accumulated earnings	70.00%	60.00%	60.00%
Terms of employee benefits			60 years
Non-current assets held for sale
Summary of Significant Accounting Policies [Line Items]
Property, plant, and equipment						$ 29,003,000,000	$ 0
Expected Credit Losses
Summary of Significant Accounting Policies [Line Items]
PD equal percentage			100.00%
CLF
Summary of Significant Accounting Policies [Line Items]
Foreign exchange rate			39,727.96	38,416.69		39,727.96	38,416.69
Banco Santander Spain \| Banco Santander-Chile
Summary of Significant Accounting Policies [Line Items]
Proportion of ownership interest in subsidiary			99.80%
Banco Santander Spain \| Teatinos Siglo XXi inversiones Ltda
Summary of Significant Accounting Policies [Line Items]
Proportion of ownership interest in subsidiary			100.00%
Banco Santander Spain \| Santander-Chile Bank
Summary of Significant Accounting Policies [Line Items]
Proportion of ownership interest in subsidiary			67.18%