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Equity (Details 1) - shares
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of transactions between related parties [line items]        
Shares 163,624,085,523 161,960,126,723 157,207,260,723  
American Depository Receipts (ADR) [1] 24,822,041,271 26,486,000,071 31,238,866,071  
Total 188,446,126,794 188,446,126,794 188,446,126,794 188,446,126,794
Percentage of equity holding 100.00% 100.00% 100.00%  
Santander Chile Holding S.A. [Member]        
Disclosure of transactions between related parties [line items]        
Shares 66,822,519,695 66,822,519,695 66,822,519,695  
American Depository Receipts (ADR) [1]  
Total 66,822,519,695 66,822,519,695 66,822,519,695  
Percentage of equity holding 35.46% 35.46% 35.46%  
Teatinos Siglo XXI Inversiones Limitada [Member]        
Disclosure of transactions between related parties [line items]        
Shares 59,770,481,573 59,770,481,573 59,770,481,573  
American Depository Receipts (ADR) [1]  
Total 59,770,481,573 59,770,481,573 59,770,481,573  
Percentage of equity holding 31.72% 31.72% 31.72%  
The Bank New York Mellon [Member]        
Disclosure of transactions between related parties [line items]        
Shares  
American Depository Receipts (ADR) [1] 24,822,041,271 26,486,000,071 31,238,866,071  
Total 24,822,041,271 26,486,000,071 31,238,866,071  
Percentage of equity holding 13.17% 14.05% 16.58%  
Banks On Behalf Of Third Parties [Member]        
Disclosure of transactions between related parties [line items]        
Shares 15,957,137,883 15,451,106,985 13,892,691,988  
American Depository Receipts (ADR) [1]  
Total 15,957,137,883 15,451,106,985 13,892,691,988  
Percentage of equity holding 8.47% 8.20% 7.37%  
Pension Funds (AFP) On Behalf Of Third Parties [Member]        
Disclosure of transactions between related parties [line items]        
Shares 9,995,705,956 9,033,172,896 6,896,552,755  
American Depository Receipts (ADR) [1]  
Total 9,995,705,956 9,033,172,896 6,896,552,755  
Percentage of equity holding 5.30% 4.79% 3.66%  
Stock Brokers On Behalf Of Third Parties [Member]        
Disclosure of transactions between related parties [line items]        
Shares 5,551,024,270 4,773,558,507 3,762,310,365  
American Depository Receipts (ADR) [1]  
Total 5,551,024,270 4,773,558,507 3,762,310,365  
Percentage of equity holding 2.95% 2.53% 2.00%  
Other Minority Holders [Member]        
Disclosure of transactions between related parties [line items]        
Shares 5,527,216,146 6,109,287,067 6,062,704,347  
American Depository Receipts (ADR) [1]  
Total 5,527,216,146 6,109,287,067 6,062,704,347  
Percentage of equity holding 2.93% 3.25% 3.21%  
[1] American Depository Receipts (ADR) are certificates issued by a U.S. commercial bank to be traded on the U.S. securities markets.