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Loans and Accounts Receivable at Amortised Cost (Details 3) - CLP ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Statement Line Items [Line Items]    
Gross carrying amount, Beginning balance $ 30,213,414  
Transfers    
Gross carrying amount, Ending balance 32,671,515 $ 30,213,414
Expected credit losses allowances, Beginning balance 882,414  
Transfers    
Expected credit losses allowances, Ending balance 896,095 882,414
Consumer Loans [Member]    
Statement Line Items [Line Items]    
Gross carrying amount, Beginning balance 4,876,289 4,557,692
Transfers    
Transfers to stage 2
Transfers to stage 3
Transfers to stage 3
Transfers to stage 1
Transfers to stage 2
Transfers to stage 1
Net changes on financial assets 382,079 843,530
Writte-off (223,919) (115,933)
Foreign exchange adjustments and others 65,246 (409,000)
Gross carrying amount, Ending balance 5,546,195 4,876,289
Expected credit losses allowances, Beginning balance 301,014 [1] 297,359
Transfers    
Transfers to stage 2 81,199 12,538
Transfers to stage 3 10,066 14,880
Transfers to stage 3 32,425 6,808
Transfers to stage 1 (24,565) (3,570)
Transfers to stage 2 (14,912) (6,164)
Transfers to stage 1 (186) (12)
Net changes of the exposure and modifications in the credit risk 125,227 37,404
Writte-off (223,919) (64,506)
Foreign exchange adjustments and others 2,118 (10,395)
Expected credit losses allowances, Ending balance 288,467 301,014 [1]
Stage 1 [Member]    
Statement Line Items [Line Items]    
Gross carrying amount, Beginning balance 26,913,508  
Transfers    
Gross carrying amount, Ending balance 29,041,636 26,913,508
Expected credit losses allowances, Beginning balance 153,640  
Transfers    
Expected credit losses allowances, Ending balance 133,269 153,640
Stage 1 [Member] | Consumer Loans [Member]    
Statement Line Items [Line Items]    
Gross carrying amount, Beginning balance 4,341,740  
Transfers    
Gross carrying amount, Ending balance 4,963,047 4,341,740
Expected credit losses allowances, Beginning balance 70,904  
Transfers    
Expected credit losses allowances, Ending balance 67,396 70,904
Stage 1 [Member] | Collective [Member] | Consumer Loans [Member]    
Statement Line Items [Line Items]    
Gross carrying amount, Beginning balance 4,727,464 3,978,393
Transfers    
Transfers to stage 2 (358,403) (46,936)
Transfers to stage 3 (25,210) (33,161)
Transfers to stage 3
Transfers to stage 1 130,611 29,777
Transfers to stage 2
Transfers to stage 1 514 37
Net changes on financial assets 430,777 766,069
Writte-off
Foreign exchange adjustments and others 57,294 (352,439)
Gross carrying amount, Ending balance 4,963,047 4,727,464
Expected credit losses allowances, Beginning balance 75,495 [1] 72,712
Transfers    
Transfers to stage 2 (28,717) (2,117)
Transfers to stage 3 (1,633) (1,431)
Transfers to stage 3
Transfers to stage 1 7,941 1,320
Transfers to stage 2
Transfers to stage 1 47 6
Net changes of the exposure and modifications in the credit risk 15,641 3,782
Writte-off
Foreign exchange adjustments and others (1,378) (3,368)
Expected credit losses allowances, Ending balance 67,396 75,495 [1]
Stage 2 [Member]    
Statement Line Items [Line Items]    
Gross carrying amount, Beginning balance 1,796,790  
Transfers    
Gross carrying amount, Ending balance 1,995,733 1,796,790
Expected credit losses allowances, Beginning balance 125,114  
Transfers    
Expected credit losses allowances, Ending balance 121,261 125,114
Stage 2 [Member] | Consumer Loans [Member]    
Statement Line Items [Line Items]    
Gross carrying amount, Beginning balance 249,039  
Transfers    
Gross carrying amount, Ending balance 292,718 249,039
Expected credit losses allowances, Beginning balance 54,372  
Transfers    
Expected credit losses allowances, Ending balance 50,808 54,372
Stage 2 [Member] | Collective [Member] | Consumer Loans [Member]    
Statement Line Items [Line Items]    
Gross carrying amount, Beginning balance 295,132 257,580
Transfers    
Transfers to stage 2 358,403 46,936
Transfers to stage 3  
Transfers to stage 3 (248,494) (19,327)
Transfers to stage 1 (130,611) (29,777)
Transfers to stage 2 56,489 17,988
Transfers to stage 1
Net changes on financial assets (45,093) 1,063
Writte-off
Foreign exchange adjustments and others 6,892 (25,424)
Gross carrying amount, Ending balance 292,718 295,132
Expected credit losses allowances, Beginning balance 60,467 [1] 54,557
Transfers    
Transfers to stage 2 109,916 14,655
Transfers to stage 3
Transfers to stage 3 (78,909) (3,913)
Transfers to stage 1 (32,506) (4,890)
Transfers to stage 2 17,002 2,943
Transfers to stage 1
Net changes of the exposure and modifications in the credit risk (25,712) (8,572)
Writte-off
Foreign exchange adjustments and others 550 (408)
Expected credit losses allowances, Ending balance 50,808 60,467 [1]
Stage 3 [Member]    
Statement Line Items [Line Items]    
Gross carrying amount, Beginning balance 1,503,116  
Transfers    
Gross carrying amount, Ending balance 1,634,146 1,503,116
Expected credit losses allowances, Beginning balance 603,660  
Transfers    
Expected credit losses allowances, Ending balance 641,565 603,660
Stage 3 [Member] | Consumer Loans [Member]    
Statement Line Items [Line Items]    
Gross carrying amount, Beginning balance 285,510  
Transfers    
Gross carrying amount, Ending balance 290,430 285,510
Expected credit losses allowances, Beginning balance 159,066  
Transfers    
Expected credit losses allowances, Ending balance 170,263 159,066
Stage 3 [Member] | Collective [Member] | Consumer Loans [Member]    
Statement Line Items [Line Items]    
Gross carrying amount, Beginning balance 300,193 321,719
Transfers    
Transfers to stage 2  
Transfers to stage 3 25,210 33,161
Transfers to stage 3 248,494 19,327
Transfers to stage 1
Transfers to stage 2 (56,489) (17,988)
Transfers to stage 1 (514) (37)
Net changes on financial assets (3,605) 76,398
Writte-off (223,919) (115,933)
Foreign exchange adjustments and others 1,060 (31,137)
Gross carrying amount, Ending balance 290,430 300,193
Expected credit losses allowances, Beginning balance 165,052 [1] 170,090
Transfers    
Transfers to stage 2
Transfers to stage 3 11,699 16,311
Transfers to stage 3 111,334 10,721
Transfers to stage 1
Transfers to stage 2 (31,914) (9,107)
Transfers to stage 1 (233) (18)
Net changes of the exposure and modifications in the credit risk 135,298 42,194
Writte-off (223,919) (64,506)
Foreign exchange adjustments and others 2,946 (6,619)
Expected credit losses allowances, Ending balance $ 170,263 $ 165,052 [1]
[1] Include loans and ECL balances of the acquired Santander Consumer Chile S.A.