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Summary of Significant Accounting Policies (Details Textual)
$ in Millions
 12 Months Ended
Dec. 31, 2019
CLP ($)
Segements
Dec. 31, 2018
Segements
Summary of Significant Accounting Policies (Textual)    
Foreign exchange rate 697.76 697.76
Average cost to sale of assets 3.12% 2.20%
Percentage of net income 0.30 0.30
Right-of-use assets | $ $ 46,423  
Financial market commisssion , description On November 15, 2019, Commission for the Financial Market (FMC) authorized Banco Santander to acquire the 51% of the Santander Consumer Chile S.A. capital share from SK Berge (49%) and Banco Santander S.A. (2%). The sale was performed on November 27, 2019.  
Incremental interest rate 1.70%  
Transbank S.A. [Member]    
Summary of Significant Accounting Policies (Textual)    
Proportion of ownership interest in subsidiary 85.00%  
CLF [Member]    
Summary of Significant Accounting Policies (Textual)    
Foreign exchange rate 28,309.94 27,565.79
Percenatge of inflation 2.70% 2.90%
USD [Member]    
Summary of Significant Accounting Policies (Textual)    
Foreign exchange rate | Segements 1 1
Banco Santander Spain [Member] | Santander-Chile Bank [Member]    
Summary of Significant Accounting Policies (Textual)    
Proportion of ownership interest in subsidiary 67.18%  
Banco Santander Spain [Member] | Teatinos Siglo XXi inversiones Ltda [Member]    
Summary of Significant Accounting Policies (Textual)    
Proportion of ownership interest in subsidiary 100.00%  
Banco Santander Spain [Member] | Banco Santander-Chile [Member]    
Summary of Significant Accounting Policies (Textual)    
Proportion of ownership interest in subsidiary 99.50%