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EQUITY (Details 1) - shares
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of transactions between related parties [line items]        
Shares 161,960,126,723 157,207,260,723 153,645,193,123  
American Depository Receipts (ADR) [1] 26,486,000,071 31,238,866,071 34,800,933,671  
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] 26,486,000,071 31,238,866,071 34,800,933,671  
Total 26,486,000,071 31,238,866,071 34,800,933,671  
Percentage of equity holding 14.05% 16.58% 18.47%  
Banks On Behalf Of Third Parties [Member]        
Disclosure of transactions between related parties [line items]        
Shares 15,451,106,985 13,892,691,988 12,257,100,312  
American Depository Receipts (ADR) [1]  
Total 15,451,106,985 13,892,691,988 12,257,100,312  
Percentage of equity holding 8.20% 7.37% 6.50%  
Pension Funds (AFP) On Behalf Of Third Parties [Member]        
Disclosure of transactions between related parties [line items]        
Shares 9,033,172,896 6,896,552,755 6,990,857,997  
American Depository Receipts (ADR) [1]  
Total 9,033,172,896 6,896,552,755 6,990,857,997  
Percentage of equity holding 4.79% 3.66% 3.71%  
Stock Brokers On Behalf Of Third Parties [Member]        
Disclosure of transactions between related parties [line items]        
Shares 4,773,558,507 3,762,310,365 3,071,882,351  
American Depository Receipts (ADR) [1]  
Total 4,773,558,507 3,762,310,365 3,071,882,351  
Percentage of equity holding 2.53% 2.00% 1.63%  
Other Minority Holders [Member]        
Disclosure of transactions between related parties [line items]        
Shares 6,109,287,067 6,062,704,347 4,732,351,195  
American Depository Receipts (ADR) [1]  
Total 6,109,287,067 6,062,704,347 4,732,351,195  
Percentage of equity holding 3.25% 3.21% 2.51%  
[1] American Depository Receipts (ADR) are certificates issued by a U.S. commercial bank to be traded on the U.S. securities markets.