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Contingencies and Commitments - Financial Guarantees (Details) - CLP ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Contingencies and Commitments    
Performance bonds $ 2,220,828 $ 2,150,307
Foreign office guarantees and standby letters of credit 285,035 279,362
Total 31,004,741 25,911,544
Financial guarantees    
Contingencies and Commitments    
Performance bonds 2,220,828 2,150,307
Foreign office guarantees and standby letters of credit 285,035 279,362
Total 2,505,863 2,429,669
Due within 1 year | Financial guarantees    
Contingencies and Commitments    
Performance bonds 1,608,314 1,583,497
Foreign office guarantees and standby letters of credit 218,532 239,823
Total 1,826,846 1,823,320
Due after 1 years but within 3 years | Financial guarantees    
Contingencies and Commitments    
Performance bonds 523,597 429,353
Foreign office guarantees and standby letters of credit 66,006 24,387
Total 589,603 453,740
Due after 3 years but within 5 years | Financial guarantees    
Contingencies and Commitments    
Performance bonds 80,623 108,315
Foreign office guarantees and standby letters of credit 280  
Total 80,903 108,315
Due after 5 years | Financial guarantees    
Contingencies and Commitments    
Performance bonds 8,294 29,142
Foreign office guarantees and standby letters of credit 217 15,152
Total $ 8,511 $ 44,294