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Provisions - Analysis of changes in exposures - Undrawn credit lines (Details) - Undrawn credit lines
$ in Millions
 12 Months Ended
Dec. 31, 2018
CLP ($)
Contingencies and Commitments  
Exposure as at beginning of period $ 7,240,406
Total 7,769,325
12-month expected credit losses | Financial instruments not credit-impaired | Individual  
Contingencies and Commitments  
Total 1,279,611
12-month expected credit losses | Financial instruments not credit-impaired | Group  
Contingencies and Commitments  
Total 5,512,504
Lifetime expected credit losses | Financial instruments not credit-impaired | Individual  
Contingencies and Commitments  
Total 178,586
Lifetime expected credit losses | Financial instruments not credit-impaired | Group  
Contingencies and Commitments  
Total 786,663
Lifetime expected credit losses | Financial instruments credit-impaired | Individual  
Contingencies and Commitments  
Total 328
Lifetime expected credit losses | Financial instruments credit-impaired | Group  
Contingencies and Commitments  
Total 11,633
Gross Balance  
Contingencies and Commitments  
Exposure as at beginning of period 7,240,406
Net change on exposures 601,223
Foreign exchange adjustments (72,304)
Total 7,769,325
Gross Balance | 12-month expected credit losses | Financial instruments not credit-impaired | Individual  
Contingencies and Commitments  
Exposure as at beginning of period 1,199,593
Net change on exposures 111,426
Transfer to Stage 1 130,936
Transfer to Stage 2 (166,795)
Transfer to Stage 3 (120)
Foreign exchange adjustments 4,571
Total 1,279,611
Gross Balance | 12-month expected credit losses | Financial instruments not credit-impaired | Group  
Contingencies and Commitments  
Exposure as at beginning of period 5,086,210
Net change on exposures 621,021
Transfer to Stage 1 491,857
Transfer to Stage 2 (561,588)
Transfer to Stage 3 (1,928)
Foreign exchange adjustments (123,068)
Total 5,512,504
Gross Balance | Lifetime expected credit losses | Financial instruments not credit-impaired | Individual  
Contingencies and Commitments  
Exposure as at beginning of period 147,053
Net change on exposures (5,449)
Transfer to Stage 1 (130,926)
Transfer to Stage 2 166,892
Transfer to Stage 3 (217)
Foreign exchange adjustments 1,233
Total 178,586
Gross Balance | Lifetime expected credit losses | Financial instruments not credit-impaired | Group  
Contingencies and Commitments  
Exposure as at beginning of period 794,449
Net change on exposures (114,834)
Transfer to Stage 1 (488,237)
Transfer to Stage 2 563,941
Transfer to Stage 3 (13,476)
Foreign exchange adjustments 44,820
Total 786,663
Gross Balance | Lifetime expected credit losses | Financial instruments credit-impaired | Individual  
Contingencies and Commitments  
Exposure as at beginning of period 411
Net change on exposures (326)
Transfer to Stage 1 (11)
Transfer to Stage 2 (97)
Transfer to Stage 3 337
Foreign exchange adjustments 14
Total 328
Gross Balance | Lifetime expected credit losses | Financial instruments credit-impaired | Group  
Contingencies and Commitments  
Exposure as at beginning of period 12,690
Net change on exposures (10,615)
Transfer to Stage 1 (3,619)
Transfer to Stage 2 (2,353)
Transfer to Stage 3 15,404
Foreign exchange adjustments 126
Total 11,633
Accumulated Amortization  
Contingencies and Commitments  
Exposure as at beginning of period 18,971
Net change on exposures (577)
Impact on year end ECL of exposures transferred between stages during the year 1,554
Foreign exchange adjustments 438
Total 20,386
Accumulated Amortization | Financial instruments not credit-impaired | Individual  
Contingencies and Commitments  
Exposure as at beginning of period 937
Net change on exposures 684
Transfer to Stage 1 99
Transfer to Stage 2 (87)
Impact on year end ECL of exposures transferred between stages during the year (3)
Foreign exchange adjustments 4
Total 1,634
Accumulated Amortization | 12-month expected credit losses | Financial instruments not credit-impaired | Group  
Contingencies and Commitments  
Exposure as at beginning of period 8,071
Net change on exposures 2,796
Transfer to Stage 1 1,463
Transfer to Stage 2 (3,246)
Transfer to Stage 3 (92)
Impact on year end ECL of exposures transferred between stages during the year 31
Foreign exchange adjustments 100
Total 9,123
Accumulated Amortization | Lifetime expected credit losses | Financial instruments not credit-impaired | Individual  
Contingencies and Commitments  
Exposure as at beginning of period 147
Net change on exposures 21
Transfer to Stage 1 (96)
Transfer to Stage 2 124
Transfer to Stage 3 (5)
Impact on year end ECL of exposures transferred between stages during the year (56)
Foreign exchange adjustments 2
Total 137
Accumulated Amortization | Lifetime expected credit losses | Financial instruments not credit-impaired | Group  
Contingencies and Commitments  
Exposure as at beginning of period 4,747
Net change on exposures (2,669)
Transfer to Stage 1 (817)
Transfer to Stage 2 3,898
Transfer to Stage 3 (818)
Impact on year end ECL of exposures transferred between stages during the year (441)
Foreign exchange adjustments 294
Total 4,194
Accumulated Amortization | Lifetime expected credit losses | Financial instruments credit-impaired | Individual  
Contingencies and Commitments  
Net change on exposures 41
Transfer to Stage 1 (4)
Transfer to Stage 2 (37)
Transfer to Stage 3 5
Impact on year end ECL of exposures transferred between stages during the year (5)
Accumulated Amortization | Lifetime expected credit losses | Financial instruments credit-impaired | Group  
Contingencies and Commitments  
Exposure as at beginning of period 5,069
Net change on exposures (1,450)
Transfer to Stage 1 (645)
Transfer to Stage 2 (652)
Transfer to Stage 3 910
Impact on year end ECL of exposures transferred between stages during the year 2,028
Foreign exchange adjustments 38
Total $ 5,298