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Risk Management (Details) - Schedule of Fair Value of Derivative Instruments - Financial Derivative Contracts [Member]
$ in Millions
 12 Months Ended
Dec. 31, 2023
CLP ($)
Credit risk [member]  
Risk Management (Details) - Schedule of Fair Value of Derivative Instruments [Line Items]  
Derivative Instruments (adjusted to market) $ 3
Deposits 8
Loans 1
Financial investments
Total Exposure $ 12
Hong Kong [Member] | Credit risk [member]  
Risk Management (Details) - Schedule of Fair Value of Derivative Instruments [Line Items]  
Classification 2
Derivative Instruments (adjusted to market)
Deposits 7
Loans
Financial investments
Total Exposure $ 7
Italy [Member] | Credit risk [member]  
Risk Management (Details) - Schedule of Fair Value of Derivative Instruments [Line Items]  
Classification 2
Derivative Instruments (adjusted to market)
Deposits 1
Loans
Financial investments
Total Exposure $ 1
México [Member] | Credit risk [member]  
Risk Management (Details) - Schedule of Fair Value of Derivative Instruments [Line Items]  
Classification 3
Derivative Instruments (adjusted to market) $ 3
Deposits
Loans
Financial investments
Total Exposure $ 3
China [Member] | Credit risk [member]  
Risk Management (Details) - Schedule of Fair Value of Derivative Instruments [Line Items]  
Classification 2
Derivative Instruments (adjusted to market)
Deposits
Loans 1
Financial investments
Total Exposure $ 1
Banco Santander Hong Kong [Member] | Credit risk [member]  
Risk Management (Details) - Schedule of Fair Value of Derivative Instruments [Line Items]  
Classification 2
Derivative Instruments (adjusted to market)
Deposits 7
Financial investments
Total Exposure 7
Banco Santander Hong Kong [Member] | Currency risk [member]  
Risk Management (Details) - Schedule of Fair Value of Derivative Instruments [Line Items]  
Loans
Banco Santander Mexico [Member] | Credit risk [member]  
Risk Management (Details) - Schedule of Fair Value of Derivative Instruments [Line Items]  
Classification 3
Derivative Instruments (adjusted to market) $ 3
Deposits
Financial investments
Total Exposure 3
Banco Santander Mexico [Member] | Currency risk [member]  
Risk Management (Details) - Schedule of Fair Value of Derivative Instruments [Line Items]  
Loans
Banco Santander EEUU [Member] | Credit risk [member]  
Risk Management (Details) - Schedule of Fair Value of Derivative Instruments [Line Items]  
Classification 1 [1]
Derivative Instruments (adjusted to market) $ 41 [1]
Deposits 700 [1]
Financial investments [1]
Total Exposure 741 [1]
Banco Santander EEUU [Member] | Currency risk [member]  
Risk Management (Details) - Schedule of Fair Value of Derivative Instruments [Line Items]  
Loans [1]
Santander UK PLC [Member] | Credit risk [member]  
Risk Management (Details) - Schedule of Fair Value of Derivative Instruments [Line Items]  
Classification 1
Derivative Instruments (adjusted to market)
Deposits 1
Financial investments
Total Exposure 1
Santander UK PLC [Member] | Currency risk [member]  
Risk Management (Details) - Schedule of Fair Value of Derivative Instruments [Line Items]  
Loans
Banco Santander España [Member] | Credit risk [member]  
Risk Management (Details) - Schedule of Fair Value of Derivative Instruments [Line Items]  
Classification 1
Derivative Instruments (adjusted to market) $ 292
Deposits 46
Financial investments
Total Exposure 338
Banco Santander España [Member] | Currency risk [member]  
Risk Management (Details) - Schedule of Fair Value of Derivative Instruments [Line Items]  
Loans
[1] Includes BSCH SA New York and Santander InvestmentSecuries