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Appendix 2 Additional Information No. 715 of February 3, 2012 - Summary of Aging of Trade and Other Receivables (Detail) - CLP ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Trade And Other Receivables [Line Items]        
Trade receivables, gross   $ 481,442,020 $ 456,552,682  
Leasing Accounts Receivables, Non-current   62,602,528 117,873,340  
Impairment losses of other assets $ (378,993) 0 0 $ 0
Other receivables, Current   69,371,881 43,780,770  
Trade and other receivables, Current   554,886,639 511,455,330  
Trade receivables, Non-current   377,047,284 191,966,929  
Trade accounts receivable and other accounts receivable   5,366,754 3,734,116  
Gross Carrying Amount [Member]        
Trade And Other Receivables [Line Items]        
Trade receivables, gross   531,179,316 500,040,783  
Leasing Accounts Receivables, Non-current   62,602,528 117,873,340  
Other receivables, Current   79,890,848 53,720,399  
Trade and other receivables, Current   619,626,310 566,919,977  
Trade receivables, Non-current   377,160,616 191,966,929  
Trade accounts receivable and other accounts receivable   5,366,754 3,734,116  
Oficio Circular Official Bulletin No715 | Trade Receivables [Member]        
Trade And Other Receivables [Line Items]        
Impairment losses of other assets   (49,737,296) (43,488,101)  
Trade receivables, Non-current   (113,332)    
Oficio Circular Official Bulletin No715 | Other Receivables [Member]        
Trade And Other Receivables [Line Items]        
Impairment losses of other assets   (10,518,967) (9,939,628)  
Oficio Circular Official Bulletin No715 | Gross Carrying Amount [Member]        
Trade And Other Receivables [Line Items]        
Accounts receivable for leasing, gross   8,556,146 13,158,795  
Leasing Accounts Receivables, Non-current   62,602,528 117,873,340  
Impairment losses of other assets   (4,483,408) (2,036,917)  
Trade and other receivables, Current   554,886,639 511,455,331  
Trade receivables, Non-current   445,016,566 313,574,385  
Oficio Circular Official Bulletin No715 | Gross Carrying Amount [Member] | Trade Receivables [Member]        
Trade And Other Receivables [Line Items]        
Trade receivables, gross   531,179,316 500,040,783  
Trade receivables, Non-current   377,160,616 191,966,929  
Oficio Circular Official Bulletin No715 | Gross Carrying Amount [Member] | Other Receivables [Member]        
Trade And Other Receivables [Line Items]        
Other receivables, Current     53,720,399  
Trade and other receivables, Current   79,890,848    
Trade accounts receivable and other accounts receivable   5,366,754 3,734,116  
Oficio Circular Official Bulletin No715 | Current Portfolio [Member] | Trade Receivables [Member]        
Trade And Other Receivables [Line Items]        
Impairment losses of other assets   (5,564,122) (3,148,393)  
Oficio Circular Official Bulletin No715 | Current Portfolio [Member] | Other Receivables [Member]        
Trade And Other Receivables [Line Items]        
Impairment losses of other assets     (55,690)  
Oficio Circular Official Bulletin No715 | Current Portfolio [Member] | Gross Carrying Amount [Member]        
Trade And Other Receivables [Line Items]        
Accounts receivable for leasing, gross   8,556,146 13,158,795  
Impairment losses of other assets   (4,483,408) (2,036,917)  
Trade and other receivables, Current   445,627,153 445,500,893  
Oficio Circular Official Bulletin No715 | Current Portfolio [Member] | Gross Carrying Amount [Member] | Trade Receivables [Member]        
Trade And Other Receivables [Line Items]        
Trade receivables, gross   377,746,656 393,746,637  
Oficio Circular Official Bulletin No715 | Current Portfolio [Member] | Gross Carrying Amount [Member] | Other Receivables [Member]        
Trade And Other Receivables [Line Items]        
Other receivables, Current   69,371,881 43,836,461  
Oficio Circular Official Bulletin No715 | 1-30 days [Member] | Trade Receivables [Member]        
Trade And Other Receivables [Line Items]        
Impairment losses of other assets   (291,820) (357,214)  
Oficio Circular Official Bulletin No715 | 1-30 days [Member] | Gross Carrying Amount [Member]        
Trade And Other Receivables [Line Items]        
Trade and other receivables, Current   36,093,197 32,102,797  
Oficio Circular Official Bulletin No715 | 1-30 days [Member] | Gross Carrying Amount [Member] | Trade Receivables [Member]        
Trade And Other Receivables [Line Items]        
Trade receivables, gross   36,385,017 32,460,011  
Oficio Circular Official Bulletin No715 | 31-60 days [Member] | Trade Receivables [Member]        
Trade And Other Receivables [Line Items]        
Impairment losses of other assets   (999,683) (484,022)  
Oficio Circular Official Bulletin No715 | 31-60 days [Member] | Gross Carrying Amount [Member]        
Trade And Other Receivables [Line Items]        
Trade and other receivables, Current   11,407,509 7,445,293  
Oficio Circular Official Bulletin No715 | 31-60 days [Member] | Gross Carrying Amount [Member] | Trade Receivables [Member]        
Trade And Other Receivables [Line Items]        
Trade receivables, gross   12,407,192 7,929,315  
Oficio Circular Official Bulletin No715 | 61 - 90 days [Member] | Trade Receivables [Member]        
Trade And Other Receivables [Line Items]        
Impairment losses of other assets   (1,089,744) (587,103)  
Oficio Circular Official Bulletin No715 | 61 - 90 days [Member] | Gross Carrying Amount [Member]        
Trade And Other Receivables [Line Items]        
Trade and other receivables, Current   5,447,770 4,113,180  
Oficio Circular Official Bulletin No715 | 61 - 90 days [Member] | Gross Carrying Amount [Member] | Trade Receivables [Member]        
Trade And Other Receivables [Line Items]        
Trade receivables, gross   6,537,514 4,700,283  
Oficio Circular Official Bulletin No715 | 91 - 120 days [Member] | Trade Receivables [Member]        
Trade And Other Receivables [Line Items]        
Impairment losses of other assets   (2,061,977) (677,088)  
Oficio Circular Official Bulletin No715 | 91 - 120 days [Member] | Gross Carrying Amount [Member]        
Trade And Other Receivables [Line Items]        
Trade and other receivables, Current   4,838,764 2,320,709  
Oficio Circular Official Bulletin No715 | 91 - 120 days [Member] | Gross Carrying Amount [Member] | Trade Receivables [Member]        
Trade And Other Receivables [Line Items]        
Trade receivables, gross   6,900,741 2,997,797  
Oficio Circular Official Bulletin No715 | 121-150 days [Member] | Trade Receivables [Member]        
Trade And Other Receivables [Line Items]        
Impairment losses of other assets   (2,685,492) (845,948)  
Oficio Circular Official Bulletin No715 | 121-150 days [Member] | Gross Carrying Amount [Member]        
Trade And Other Receivables [Line Items]        
Trade and other receivables, Current   4,861,478 1,908,418  
Oficio Circular Official Bulletin No715 | 121-150 days [Member] | Gross Carrying Amount [Member] | Trade Receivables [Member]        
Trade And Other Receivables [Line Items]        
Trade receivables, gross   7,546,970 2,754,366  
Oficio Circular Official Bulletin No715 | 151-180 days [Member] | Trade Receivables [Member]        
Trade And Other Receivables [Line Items]        
Impairment losses of other assets   (3,242,896) (804,567)  
Oficio Circular Official Bulletin No715 | 151-180 days [Member] | Gross Carrying Amount [Member]        
Trade And Other Receivables [Line Items]        
Trade and other receivables, Current   3,813,146 2,233,138  
Oficio Circular Official Bulletin No715 | 151-180 days [Member] | Gross Carrying Amount [Member] | Trade Receivables [Member]        
Trade And Other Receivables [Line Items]        
Trade receivables, gross   7,056,042 3,037,705  
Oficio Circular Official Bulletin No715 | 181-210 days [Member] | Trade Receivables [Member]        
Trade And Other Receivables [Line Items]        
Impairment losses of other assets   (2,392,141) (1,413,915)  
Oficio Circular Official Bulletin No715 | 181-210 days [Member] | Gross Carrying Amount [Member]        
Trade And Other Receivables [Line Items]        
Trade and other receivables, Current   1,477,091 1,253,184  
Oficio Circular Official Bulletin No715 | 181-210 days [Member] | Gross Carrying Amount [Member] | Trade Receivables [Member]        
Trade And Other Receivables [Line Items]        
Trade receivables, gross   3,869,232 2,667,099  
Oficio Circular Official Bulletin No715 | 211-250 days [Member] | Trade Receivables [Member]        
Trade And Other Receivables [Line Items]        
Impairment losses of other assets   (2,225,233) (1,114,081)  
Oficio Circular Official Bulletin No715 | 211-250 days [Member] | Gross Carrying Amount [Member]        
Trade And Other Receivables [Line Items]        
Trade and other receivables, Current   1,314,469 1,396,602  
Oficio Circular Official Bulletin No715 | 211-250 days [Member] | Gross Carrying Amount [Member] | Trade Receivables [Member]        
Trade And Other Receivables [Line Items]        
Trade receivables, gross   3,539,702 2,510,683  
Oficio Circular Official Bulletin No715 | More than 251 days [Member] | Trade Receivables [Member]        
Trade And Other Receivables [Line Items]        
Impairment losses of other assets   (29,184,188) (34,055,771)  
Oficio Circular Official Bulletin No715 | More than 251 days [Member] | Other Receivables [Member]        
Trade And Other Receivables [Line Items]        
Impairment losses of other assets   (10,518,967) (9,883,938)  
Oficio Circular Official Bulletin No715 | More than 251 days [Member] | Gross Carrying Amount [Member]        
Trade And Other Receivables [Line Items]        
Trade and other receivables, Current   40,006,062 13,181,116  
Oficio Circular Official Bulletin No715 | More than 251 days [Member] | Gross Carrying Amount [Member] | Trade Receivables [Member]        
Trade And Other Receivables [Line Items]        
Trade receivables, gross   69,190,250 47,236,887  
Oficio Circular Official Bulletin No715 | More than 251 days [Member] | Gross Carrying Amount [Member] | Other Receivables [Member]        
Trade And Other Receivables [Line Items]        
Other receivables, Current   $ 10,518,967 $ 9,883,938