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Debt Issued - Current Bonds Long-Term December 31, 2018 (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2018
CLP ($)
BCHIEA0617 [Member]  
Statement Line Items [Line Items]  
Currency UF
Amount $ 106,001
Terms Years 6 years
Annual issue rate 1.60%
Issue date Jan. 03, 2024
Maturity date Jan. 03, 2024
BCHIBN1015 [Member]  
Statement Line Items [Line Items]  
Currency UF
Amount $ 114,212
Terms Years 12 years
Annual issue rate 2.90%
Issue date Jan. 24, 2018
Maturity date Jan. 24, 2030
BCHIEF1117 [Member]  
Statement Line Items [Line Items]  
Currency UF
Amount $ 79,612
Terms Years 8 years
Annual issue rate 1.80%
Issue date Feb. 09, 2026
Maturity date Feb. 09, 2026
BCHIEP0717 [Member]  
Statement Line Items [Line Items]  
Currency UF
Amount $ 104,550
Terms Years 11 years
Annual issue rate 2.00%
Issue date Feb. 13, 2018
Maturity date Feb. 13, 2029
BCHIBT1215 [Member]  
Statement Line Items [Line Items]  
Currency UF
Amount $ 57,936
Terms Years 14 years
Annual issue rate 3.00%
Issue date Mar. 13, 2018
Maturity date Mar. 13, 2032
BCHIBW1215 [Member]  
Statement Line Items [Line Items]  
Currency UF
Amount $ 59,081
Terms Years 14 years
Annual issue rate 2.20%
Issue date Aug. 14, 2018
Maturity date Aug. 14, 2032
BCHIDY0917 [Member]  
Statement Line Items [Line Items]  
Currency UF
Amount $ 55,619
Terms Years 5 years
Annual issue rate 1.24%
Issue date Aug. 16, 2018
Maturity date Aug. 16, 2023
BCHIEN1117 [Member]  
Statement Line Items [Line Items]  
Currency UF
Amount $ 109,543
Terms Years 10 years
Annual issue rate 2.08%
Issue date Sep. 25, 2018
Maturity date Sep. 25, 2028
BCHIDX0817 [Member]  
Statement Line Items [Line Items]  
Currency UF
Amount $ 109,311
Terms Years 5 years
Annual issue rate 1.70%
Issue date Oct. 22, 2018
Maturity date Oct. 22, 2023
BCHIDY0917 [Member]  
Statement Line Items [Line Items]  
Currency UF
Amount $ 12,025
Terms Years 5 years
Annual issue rate 1.74%
Issue date Oct. 22, 2018
Maturity date Oct. 22, 2023
BCHIDY0917 [Member]  
Statement Line Items [Line Items]  
Currency UF
Amount $ 15,299
Terms Years 5 years
Annual issue rate 1.75%
Issue date Oct. 22, 2018
Maturity date Oct. 22, 2023
BCHIBY1215 [Member]  
Statement Line Items [Line Items]  
Currency UF
Amount $ 59,374
Terms Years 15 years
Annual issue rate 2.29%
Issue date Oct. 24, 2018
Maturity date Oct. 24, 2033
BCHIBX0815 [Member]  
Statement Line Items [Line Items]  
Currency UF
Amount $ 58,998
Terms Years 15 years
Annual issue rate 2.29%
Issue date Oct. 24, 2018
Maturity date Oct. 24, 2033
BCHIBZ0815 [Member]  
Statement Line Items [Line Items]  
Currency UF
Amount $ 59,987
Terms Years 15 years
Annual issue rate 2.23%
Issue date Jul. 12, 2018
Maturity date Dec. 07, 2033
BCHIEJ0717 [Member]  
Statement Line Items [Line Items]  
Currency UF
Amount $ 82,878
Terms Years 9 years
Annual issue rate 1.99%
Issue date Dec. 12, 2018
Maturity date Dec. 12, 2027
Subtotal UF [Member]  
Statement Line Items [Line Items]  
Amount $ 1,084,426
BCHIDH0916 [Member]  
Statement Line Items [Line Items]  
Amount $ 20,370
Terms Years 4 years
Annual issue rate 3.80%
Issue date Nov. 06, 2018
Maturity date Jun. 11, 2022
BONO USD [Member]  
Statement Line Items [Line Items]  
Amount $ 32,842
Terms Years 10 years
Annual issue rate 4.26%
Issue date Sep. 28, 2018
Maturity date Sep. 28, 2028
BONO CHF [Member]  
Statement Line Items [Line Items]  
Amount $ 79,229
Terms Years 5 years
Annual issue rate 0.57%
Issue date Oct. 26, 2018
Maturity date Oct. 26, 2023
Subtotal other currencies [Member]  
Statement Line Items [Line Items]  
Amount $ 132,441
Total Currency [Member]  
Statement Line Items [Line Items]  
Amount $ 1,216,867