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Trade and Other Receivables - Trade and Other Receivables (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2021
Dec. 31, 2020
Trade and Other Receivables [Line Items]    
Gross amount ₩ 10,324,255 ₩ 10,126,268
Allowance for doubtful accounts (288,049) (341,369)
Present value discount (6,930) (4,860)
Trade and other receivables 10,029,276 9,780,039
Other receivables    
Trade and Other Receivables [Line Items]    
Gross amount 2,395,008 2,528,084
Allowance for doubtful accounts (82,710) (132,379)
Present value discount (6,930) (4,860)
Trade and other receivables 2,305,368 2,390,845
Current assets    
Trade and Other Receivables [Line Items]    
Gross amount 8,345,848 8,170,521
Allowance for doubtful accounts (222,393) (250,516)
Present value discount (1,040) (1,535)
Trade and other receivables 8,122,415 7,918,470
Current assets | Trade receivables    
Trade and Other Receivables [Line Items]    
Gross amount 7,743,735 7,370,923
Allowance for doubtful accounts (203,838) (208,184)
Present value discount 0 0
Trade and other receivables 7,539,897 7,162,739
Current assets | Other receivables    
Trade and Other Receivables [Line Items]    
Gross amount 602,113 799,598
Allowance for doubtful accounts (18,555) (42,332)
Present value discount (1,040) (1,535)
Trade and other receivables 582,518 755,731
Current assets | Non-trade receivables    
Trade and Other Receivables [Line Items]    
Gross amount 232,172 441,031
Allowance for doubtful accounts (17,084) (37,062)
Present value discount (9) 0
Trade and other receivables 215,079 403,969
Current assets | Accrued income    
Trade and Other Receivables [Line Items]    
Gross amount 57,300 38,956
Allowance for doubtful accounts 0 0
Present value discount 0 0
Trade and other receivables 57,300 38,956
Current assets | Deposits    
Trade and Other Receivables [Line Items]    
Gross amount 212,666 239,011
Allowance for doubtful accounts 0 0
Present value discount (1,031) (1,535)
Trade and other receivables 211,635 237,476
Current assets | Finance lease receivables    
Trade and Other Receivables [Line Items]    
Gross amount 60,613 [1] 57,084 [2]
Allowance for doubtful accounts (178) [1] (365) [2]
Present value discount 0 [1] 0 [2]
Trade and other receivables 60,435 [1] 56,719 [2]
Current assets | Others    
Trade and Other Receivables [Line Items]    
Gross amount 39,362 23,516
Allowance for doubtful accounts (1,293) (4,905)
Present value discount 0 0
Trade and other receivables 38,069 18,611
Non-current assets    
Trade and Other Receivables [Line Items]    
Gross amount 1,978,407 1,955,747
Allowance for doubtful accounts (65,656) (90,853)
Present value discount (5,890) (3,325)
Trade and other receivables 1,906,861 1,861,569
Non-current assets | Trade receivables    
Trade and Other Receivables [Line Items]    
Gross amount 185,512 227,261
Allowance for doubtful accounts (1,501) (806)
Present value discount 0 0
Trade and other receivables 184,011 226,455
Non-current assets | Other receivables    
Trade and Other Receivables [Line Items]    
Gross amount 1,792,895 1,728,486
Allowance for doubtful accounts (64,155) (90,047)
Present value discount (5,890) (3,325)
Trade and other receivables 1,722,850 1,635,114
Non-current assets | Non-trade receivables    
Trade and Other Receivables [Line Items]    
Gross amount 123,537 215,136
Allowance for doubtful accounts (56,407) (80,451)
Present value discount (281) 0
Trade and other receivables 66,849 134,685
Non-current assets | Accrued income    
Trade and Other Receivables [Line Items]    
Gross amount 1,828 834
Allowance for doubtful accounts 0 0
Present value discount 0 0
Trade and other receivables 1,828 834
Non-current assets | Deposits    
Trade and Other Receivables [Line Items]    
Gross amount 441,393 364,855
Allowance for doubtful accounts 0 0
Present value discount (5,609) (3,325)
Trade and other receivables 435,784 361,530
Non-current assets | Finance lease receivables    
Trade and Other Receivables [Line Items]    
Gross amount 1,140,080 [3] 1,065,982 [2],[4]
Allowance for doubtful accounts (590) [3] (625) [2],[4]
Present value discount 0 [3] 0 [2],[4]
Trade and other receivables 1,139,490 [3] 1,065,357 [2],[4]
Non-current assets | Others    
Trade and Other Receivables [Line Items]    
Gross amount 86,057 81,679
Allowance for doubtful accounts (7,158) (8,971)
Present value discount 0 0
Trade and other receivables ₩ 78,899 ₩ 72,708
[1] Gross amount of finance lease receivables is the net lease investment by deducting unearned finance income of ￦111,915 million.
[2]  Gross amount of finance lease receivables is the net lease investment by deducting unearned finance income of ￦105,127 million.
[3] Gross amount of finance lease receivables is the net lease investment by deducting unearned finance income of ￦1,082,712 million.
[4]  Gross amount of finance lease receivables is the net lease investment by deducting unearned finance income of ￦1,087,559 million.