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Debt Issued - Short-term Bonds December 31, 2018 (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2018
CLP ($)
Wells Fargo Bank [Member]  
Statement Line Items [Line Items]  
Currency  USD
Amount $ 2,998
Annual issue rate 1.85%
Issue date Feb. 06, 2018
Maturity date May 08, 2018
Wells Fargo Bank [Member]  
Statement Line Items [Line Items]  
Currency  USD
Amount $ 2,998
Annual issue rate 1.93%
Issue date Feb. 06, 2018
Maturity date Jun. 08, 2018
Wells Fargo Bank [Member]  
Statement Line Items [Line Items]  
Currency  USD
Amount $ 2,998
Annual issue rate 1.98%
Issue date Feb. 06, 2018
Maturity date Jul. 09, 2018
Wells Fargo Bank [Member]  
Statement Line Items [Line Items]  
Currency  USD
Amount $ 2,998
Annual issue rate 2.05%
Issue date Feb. 06, 2018
Maturity date Aug. 06, 2018
Wells Fargo Bank [Member]  
Statement Line Items [Line Items]  
Currency  USD
Amount $ 2,998
Annual issue rate 2.05%
Issue date Feb. 06, 2018
Maturity date Aug. 08, 2018
Wells Fargo Bank [Member]  
Statement Line Items [Line Items]  
Currency  USD
Amount $ 29,716
Annual issue rate 2.25%
Issue date Feb. 28, 2018
Maturity date Jun. 28, 2018
Wells Fargo Bank [Member]  
Statement Line Items [Line Items]  
Currency  USD
Amount $ 1,723
Annual issue rate 2.40%
Issue date Feb. 28, 2018
Maturity date Aug. 29, 2018
Citibank N.A. [Member]  
Statement Line Items [Line Items]  
Currency  USD
Amount $ 6,894
Annual issue rate 2.60%
Issue date Feb. 28, 2018
Maturity date Feb. 25, 2019
Wells Fargo Bank [Member]  
Statement Line Items [Line Items]  
Currency  USD
Amount $ 13,780
Annual issue rate 2.30%
Issue date Mar. 02, 2018
Maturity date Jul. 02, 2018
Wells Fargo Bank [Member]  
Statement Line Items [Line Items]  
Currency  USD
Amount $ 4,489
Annual issue rate 2.30%
Issue date Mar. 05, 2018
Maturity date Jul. 06, 2018
Citibank N.A. [Member]  
Statement Line Items [Line Items]  
Currency  USD
Amount $ 18,080
Annual issue rate 2.22%
Issue date Mar. 07, 2018
Maturity date Jun. 05, 2018
Wells Fargo Bank [Member]  
Statement Line Items [Line Items]  
Currency  USD
Amount $ 1,747
Annual issue rate 2.25%
Issue date Mar. 13, 2018
Maturity date Jun. 11, 2018
Wells Fargo Bank [Member]  
Statement Line Items [Line Items]  
Currency  USD
Amount $ 3,006
Annual issue rate 2.45%
Issue date Mar. 14, 2018
Maturity date Sep. 11, 2018
Wells Fargo Bank [Member]  
Statement Line Items [Line Items]  
Currency  USD
Amount $ 606
Annual issue rate 2.60%
Issue date Mar. 15, 2018
Maturity date Dec. 14, 2018
Wells Fargo Bank [Member]  
Statement Line Items [Line Items]  
Currency  USD
Amount $ 605
Annual issue rate 2.60%
Issue date Mar. 29, 2018
Maturity date Sep. 28, 2018
Wells Fargo Bank [Member]  
Statement Line Items [Line Items]  
Currency  USD
Amount $ 60,343
Annual issue rate 2.60%
Issue date Apr. 05, 2018
Maturity date Sep. 04, 2018
Wells Fargo Bank [Member]  
Statement Line Items [Line Items]  
Currency  USD
Amount $ 30,254
Annual issue rate 2.50%
Issue date Apr. 06, 2018
Maturity date Aug. 01, 2018
Wells Fargo Bank [Member]  
Statement Line Items [Line Items]  
Currency  USD
Amount $ 1,743
Annual issue rate 2.40%
Issue date Apr. 10, 2018
Maturity date Aug. 09, 2018
Wells Fargo Bank [Member]  
Statement Line Items [Line Items]  
Currency  USD
Amount $ 8,918
Annual issue rate 2.75%
Issue date Apr. 13, 2018
Maturity date Apr. 12, 2019
Wells Fargo Bank [Member]  
Statement Line Items [Line Items]  
Currency  USD
Amount $ 8,946
Annual issue rate 2.75%
Issue date Apr. 17, 2018
Maturity date Apr. 16, 2019
Citibank N.A. [Member]  
Statement Line Items [Line Items]  
Currency  USD
Amount $ 19,046
Annual issue rate 2.36%
Issue date May 08, 2018
Maturity date Aug. 08, 2018
Citibank N.A. [Member]  
Statement Line Items [Line Items]  
Currency  USD
Amount $ 31,665
Annual issue rate 2.38%
Issue date May 09, 2018
Maturity date Aug. 07, 2018
Citibank N.A. [Member]  
Statement Line Items [Line Items]  
Currency  USD
Amount $ 1,873
Annual issue rate 2.37%
Issue date May 10, 2018
Maturity date Aug. 08, 2018
Citibank N.A. [Member]  
Statement Line Items [Line Items]  
Currency  USD
Amount $ 12,250
Annual issue rate 2.36%
Issue date May 14, 2018
Maturity date Aug. 15, 2018
Wells Fargo Bank [Member]  
Statement Line Items [Line Items]  
Currency  USD
Amount $ 18,968
Annual issue rate 2.70%
Issue date Jun. 11, 2018
Maturity date Apr. 01, 2019
Wells Fargo Bank [Member]  
Statement Line Items [Line Items]  
Currency  USD
Amount $ 28,973
Annual issue rate 2.42%
Issue date Jun. 13, 2018
Maturity date Jul. 24, 2018
Wells Fargo Bank [Member]  
Statement Line Items [Line Items]  
Currency  USD
Amount $ 15,991
Annual issue rate 2.45%
Issue date Jun. 19, 2018
Maturity date Sep. 20, 2018
Citibank N.A. [Member]  
Statement Line Items [Line Items]  
Currency  USD
Amount $ 12,778
Annual issue rate 2.41%
Issue date Jun. 20, 2018
Maturity date Sep. 20, 2018
Citibank N.A. [Member]  
Statement Line Items [Line Items]  
Currency  USD
Amount $ 31,944
Annual issue rate 2.45%
Issue date Jun. 20, 2018
Maturity date Oct. 03, 2018
Wells Fargo Bank [Member]  
Statement Line Items [Line Items]  
Currency  USD
Amount $ 3,194
Annual issue rate 2.65%
Issue date Jun. 20, 2018
Maturity date Feb. 13, 2019
Citibank N.A. [Member]  
Statement Line Items [Line Items]  
Currency  USD
Amount $ 3,885
Annual issue rate 2.50%
Issue date Jun. 22, 2018
Maturity date Nov. 23, 2018
Wells Fargo Bank [Member]  
Statement Line Items [Line Items]  
Currency  USD
Amount $ 19,495
Annual issue rate 2.20%
Issue date Jun. 28, 2018
Maturity date Jul. 27, 2018
Wells Fargo Bank [Member]  
Statement Line Items [Line Items]  
Currency  USD
Amount $ 4,875
Annual issue rate 2.30%
Issue date Jul. 03, 2018
Maturity date Sep. 11, 2018
Wells Fargo Bank [Member]  
Statement Line Items [Line Items]  
Currency  USD
Amount $ 29,556
Annual issue rate 2.30%
Issue date Jul. 06, 2018
Maturity date Sep. 10, 2018
Wells Fargo Bank [Member]  
Statement Line Items [Line Items]  
Currency  USD
Amount $ 62,079
Annual issue rate 2.45%
Issue date Jul. 17, 2018
Maturity date Oct. 17, 2018
Wells Fargo Bank [Member]  
Statement Line Items [Line Items]  
Currency  USD
Amount $ 32,729
Annual issue rate 2.45%
Issue date Jul. 24, 2018
Maturity date Oct. 22, 2018
Wells Fargo Bank [Member]  
Statement Line Items [Line Items]  
Currency  USD
Amount $ 19,283
Annual issue rate 2.45%
Issue date Jul. 27, 2018
Maturity date Oct. 29, 2018
Wells Fargo Bank [Member]  
Statement Line Items [Line Items]  
Currency  USD
Amount $ 31,919
Annual issue rate 2.50%
Issue date Jul. 30, 2018
Maturity date Nov. 29, 2018
Wells Fargo Bank [Member]  
Statement Line Items [Line Items]  
Currency  USD
Amount $ 16,039
Annual issue rate 2.52%
Issue date Aug. 01, 2018
Maturity date Dec. 06, 2018
Citibank N.A. [Member]  
Statement Line Items [Line Items]  
Currency  USD
Amount $ 25,787
Annual issue rate 2.50%
Issue date Aug. 02, 2018
Maturity date Dec. 06, 2018
Wells Fargo Bank [Member]  
Statement Line Items [Line Items]  
Currency  USD
Amount $ 10,859
Annual issue rate 2.47%
Issue date Aug. 07, 2018
Maturity date Dec. 14, 2018
Wells Fargo Bank [Member]  
Statement Line Items [Line Items]  
Currency  USD
Amount $ 3,238
Annual issue rate 2.46%
Issue date Aug. 09, 2018
Maturity date Dec. 14, 2018
Wells Fargo Bank [Member]  
Statement Line Items [Line Items]  
Currency  USD
Amount $ 17,070
Annual issue rate 2.53%
Issue date Aug. 31, 2018
Maturity date Dec. 28, 2018
Wells Fargo Bank [Member]  
Statement Line Items [Line Items]  
Currency  USD
Amount $ 6,929
Annual issue rate 2.58%
Issue date Sep. 04, 2018
Maturity date Feb. 06, 2019
Citibank N.A. [Member]  
Statement Line Items [Line Items]  
Currency  USD
Amount $ 34,646
Annual issue rate 2.57%
Issue date Apr. 09, 2018
Maturity date Apr. 01, 2019
Citibank N.A. [Member]  
Statement Line Items [Line Items]  
Currency  USD
Amount $ 4,902
Annual issue rate 2.24%
Issue date Sep. 07, 2018
Maturity date Oct. 09, 2018
Citibank N.A. [Member]  
Statement Line Items [Line Items]  
Currency  USD
Amount $ 34,525
Annual issue rate 2.25%
Issue date Sep. 07, 2018
Maturity date Oct. 09, 2018
Citibank N.A. [Member]  
Statement Line Items [Line Items]  
Currency  USD
Amount $ 1,742
Annual issue rate 2.23%
Issue date Sep. 10, 2018
Maturity date Oct. 09, 2018
Wells Fargo Bank [Member]  
Statement Line Items [Line Items]  
Currency  USD
Amount $ 3,484
Annual issue rate 2.65%
Issue date Sep. 10, 2018
Maturity date Mar. 11, 2019
Wells Fargo Bank [Member]  
Statement Line Items [Line Items]  
Currency  USD
Amount $ 6,026
Annual issue rate 2.45%
Issue date Sep. 11, 2018
Maturity date Dec. 06, 2018
Bofa Merrill Lynch [Member]  
Statement Line Items [Line Items]  
Currency  USD
Amount $ 18,421
Annual issue rate 2.62%
Issue date Sep. 14, 2018
Maturity date Mar. 01, 2019
Wells Fargo Bank [Member]  
Statement Line Items [Line Items]  
Currency  USD
Amount $ 33,464
Annual issue rate 2.48%
Issue date Sep. 20, 2018
Maturity date Dec. 20, 2018
Wells Fargo Bank [Member]  
Statement Line Items [Line Items]  
Currency  USD
Amount $ 1,322
Annual issue rate 2.70%
Issue date Oct. 03, 2018
Maturity date Apr. 05, 2019
Wells Fargo Bank [Member]  
Statement Line Items [Line Items]  
Currency  USD
Amount $ 13,591
Annual issue rate 2.78%
Issue date Oct. 12, 2018
Maturity date Apr. 25, 2019
Wells Fargo Bank [Member]  
Statement Line Items [Line Items]  
Currency  USD
Amount $ 6,694
Annual issue rate 2.55%
Issue date Oct. 16, 2018
Maturity date Jan. 16, 2019
Citibank N.A. [Member]  
Statement Line Items [Line Items]  
Currency  USD
Amount $ 6,713
Annual issue rate 2.50%
Issue date Oct. 17, 2018
Maturity date Jan. 04, 2019
Citibank N.A. [Member]  
Statement Line Items [Line Items]  
Currency  USD
Amount $ 34,208
Annual issue rate 2.65%
Issue date Oct. 23, 2018
Maturity date Jan. 22, 2019
Citibank N.A. [Member]  
Statement Line Items [Line Items]  
Currency  USD
Amount $ 20,483
Annual issue rate 2.84%
Issue date Dec. 11, 2018
Maturity date Mar. 11, 2019
Wells Fargo Bank [Member]  
Statement Line Items [Line Items]  
Currency  USD
Amount $ 2,236
Annual issue rate 2.90%
Issue date Dec. 12, 2018
Maturity date Apr. 12, 2019
Wells Fargo Bank [Member]  
Statement Line Items [Line Items]  
Currency  USD
Amount $ 34,555
Annual issue rate 2.67%
Issue date Dec. 20, 2018
Maturity date Feb. 19, 2019
Wells Fargo Bank [Member]  
Statement Line Items [Line Items]  
Currency  USD
Amount $ 10,466
Annual issue rate 2.97%
Issue date Dec. 27, 2018
Maturity date May 02, 2019
Wells Fargo Bank [Member]  
Statement Line Items [Line Items]  
Currency  USD
Amount $ 6,977
Annual issue rate 2.97%
Issue date Dec. 27, 2018
Maturity date Apr. 29, 2019
Short-term Bonds [Member]  
Statement Line Items [Line Items]  
Amount $ 940,720