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Fair Value of Financial Assets and Liabilities-Offsetting of financial assets and liabilities (Details) - Derivatives - CLP ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Effect of offsetting on assets balance sheet    
Gross amount $ 1,247,941 $ 939,649
Net amounts reported on the balance sheet 1,247,941 939,649
Related amount not offset    
Financial Instruments (600,439) (588,360)
Financial Collateral (34,212) (54,336)
Net amount 613,290 296,953
Effect of offsetting on liabilities balance sheet    
Gross amount 1,392,995 966,509
Net amounts reported on the balance sheet 1,392,995 966,509
Related amount not offset    
Financial Instruments (600,439) (588,360)
Financial Collateral (83,523) (164,889)
Net amount $ 709,033 $ 213,260