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Common Shareholders' Equity (Details) - Equity Holders [Member] - CLP ($) $ / shares in Units, shares in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Statement [Line Items] |  |  |
Equity holders of the controlling company | $ 96,152,272 | $ 130,141,692 | $ 306,890,792
Weighted average number of shares | 369,502,872 | 369,502,872 | 369,502,872
Basic income per share | $ 260.22 | $ 352.21 | $ 830.55
Diluted income per share | $ 260.22 | $ 352.21 | $ 830.55

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