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Cover
 12 Months Ended
Dec. 31, 2024
shares
Document Information [Line Items]  
Document Type 20-F
Document Registration Statement false
Document Annual Report true
Document Period End Date Dec. 31, 2024
Current Fiscal Year End Date --12-31
Document Transition Report false
Document Shell Company Report false
Entity File Number 001-14554
Entity Registrant Name BANCO SANTANDER-CHILE
Entity Incorporation, State or Country Code F3
Entity Address, Address Line One Bandera 140
Entity Address, Address Line Two 20th floor
Entity Address, City or Town Santiago
Entity Address, Country CL
Entity Common Stock, Shares Outstanding 188,446,126,794
Entity Well-known Seasoned Issuer Yes
Entity Voluntary Filers No
Entity Current Reporting Status Yes
Entity Interactive Data Current Yes
Entity Filer Category Large Accelerated Filer
Entity Emerging Growth Company false
ICFR Auditor Attestation Flag true
Document Financial Statement Error Correction [Flag] false
Document Accounting Standard International Financial Reporting Standards
Entity Shell Company false
Entity Central Index Key 0001027552
Document Fiscal Year Focus 2024
Document Fiscal Period Focus FY
Amendment Flag false
Business Contact  
Document Information [Line Items]  
Entity Address, Address Line One Bandera 140
Entity Address, Address Line Two 20th Floor
Entity Address, City or Town Santiago
Entity Address, Country CL
City Area Code 562
Local Phone Number 26483583
Contact Personnel Name Cristian Vicuña
Contact Personnel Email Address cristian.vicuna@santander.cl
American Depositary Shares (“ADS”), each representing the right to receive 400 Shares of Common Stock without par value  
Document Information [Line Items]  
Title of 12(b) Security American Depositary Shares (“ADS”), each representing the right to receive 400 Shares of Common Stock without par value
Trading Symbol BSAC
Security Exchange Name NYSE
Shares of Common Stock, without par value  
Document Information [Line Items]  
Title of 12(b) Security Shares of Common Stock, without par value*
Trading Symbol BSAC
Security Exchange Name NYSE