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Common Shareholders' Equity (Details 3) - CLP ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of Common Shareholders' Equity [Line Items]      
Gains (losses) on cash flow hedges, before tax $ (55,220,514) $ 17,077,670 $ 37,990,079
Other comprehensive income, before tax, gains (losses) on remeasurements of defined benefit plans (1,859,692) (4,127,305) (1,263,781)
Other comprehensive income, before tax (53,011,351) 13,296,351 36,789,306
Income tax relating to cash flow hedges of other comprehensive income 1,098,591 93,416 16,196
Income tax relating to remeasurements of defined benefit plans of other comprehensive income (488,246) (1,107,699) (339,533)
Charge to equity (610,345) 1,014,283 323,337
Gains (losses) on exchange differences on translation, net of tax 4,068,855 345,986 63,008
Other comprehensive income (53,621,696) 14,310,634 37,112,643
Equity Holders [Member]      
Disclosure of Common Shareholders' Equity [Line Items]      
Gains (losses) on cash flow hedges, before tax 4,068,855 345,986 63,008
Gains (losses) on exchange differences on translation, before tax (55,220,514) 17,077,670 37,990,079
Other comprehensive income, before tax, gains (losses) on remeasurements of defined benefit plans (1,859,692) (4,127,305) (1,263,781)
Other comprehensive income, before tax (53,011,351) 13,296,351 36,789,306
Income tax relating to cash flow hedges of other comprehensive income (1,098,591) (93,416) (16,196)
Income tax relating to exchange differences on translation of other comprehensive income 0 0 0
Income tax relating to remeasurements of defined benefit plans of other comprehensive income 488,246 1,107,699 339,533
Charge to equity (610,345) 1,014,283 323,337
Gains (losses) on cash flow hedges, net of tax 2,970,264 252,570 46,812
Gains (losses) on exchange differences on translation, net of tax (55,220,514) 17,077,670 37,990,079
Other comprehensive income, net of tax, gains (losses) on remeasurements of defined benefit plans (1,371,446) (3,019,606) (924,248)
Other comprehensive income $ (53,621,696) $ 14,310,634 $ 37,112,643