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Trade and Other Receivables - Trade and other receivables (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2019
Dec. 31, 2018
Trade and Other Receivables [Line Items]    
Gross amount ₩ 2,552,077 ₩ 2,225,024
Allowance for doubtful accounts (114,155) (104,726)
Present value discount (6,976) (8,928)
Trade and other receivables 2,430,946 2,111,370
Current assets    
Trade and Other Receivables [Line Items]    
Gross amount 7,939,830 8,031,625
Allowance for doubtful accounts (236,084) (236,006)
Present value discount (2,294) (2,027)
Trade and other receivables 7,701,452 7,793,592
Current assets | Trade receivables    
Trade and Other Receivables [Line Items]    
Gross amount 7,147,683 7,303,065
Allowance for doubtful accounts (208,505) (215,775)
Present value discount 0 0
Trade and other receivables 6,939,178 7,087,290
Current assets | Other receivables    
Trade and Other Receivables [Line Items]    
Gross amount 792,147 728,560
Allowance for doubtful accounts (27,579) (20,231)
Present value discount (2,294) (2,027)
Trade and other receivables 762,274 706,302
Current assets | Non-trade receivables    
Trade and Other Receivables [Line Items]    
Gross amount 376,438 298,587
Allowance for doubtful accounts (27,201) (19,940)
Present value discount 0 0
Trade and other receivables 349,237 278,647
Current assets | Accrued income    
Trade and Other Receivables [Line Items]    
Gross amount 68,921 102,023
Allowance for doubtful accounts 0 0
Present value discount 0 0
Trade and other receivables 68,921 102,023
Current assets | Deposits    
Trade and Other Receivables [Line Items]    
Gross amount 273,887 228,466
Allowance for doubtful accounts 0 0
Present value discount (2,294) (2,027)
Trade and other receivables 271,593 226,439
Current assets | Finance lease receivables    
Trade and Other Receivables [Line Items]    
Gross amount 60,304 84,688
Allowance for doubtful accounts (378) (291)
Present value discount 0 0
Trade and other receivables 59,926 84,397
Current assets | Others    
Trade and Other Receivables [Line Items]    
Gross amount 12,597 14,796
Allowance for doubtful accounts 0 0
Present value discount 0 0
Trade and other receivables 12,597 14,796
Non-current assets    
Trade and Other Receivables [Line Items]    
Gross amount 2,098,191 1,911,782
Allowance for doubtful accounts (90,830) (84,588)
Present value discount (5,064) (7,349)
Trade and other receivables 2,002,297 1,819,845
Non-current assets | Trade receivables    
Trade and Other Receivables [Line Items]    
Gross amount 338,261 415,318
Allowance for doubtful accounts (4,254) (93)
Present value discount (382) (448)
Trade and other receivables 333,625 414,777
Non-current assets | Other receivables    
Trade and Other Receivables [Line Items]    
Gross amount 1,759,930 1,496,464
Allowance for doubtful accounts (86,576) (84,495)
Present value discount (4,682) (6,901)
Trade and other receivables 1,668,672 1,405,068
Non-current assets | Non-trade receivables    
Trade and Other Receivables [Line Items]    
Gross amount 196,821 136,432
Allowance for doubtful accounts (78,654) (77,475)
Present value discount 0 0
Trade and other receivables 118,167 58,957
Non-current assets | Accrued income    
Trade and Other Receivables [Line Items]    
Gross amount 2,222 0
Allowance for doubtful accounts 0 0
Present value discount 0 0
Trade and other receivables 2,222 0
Non-current assets | Deposits    
Trade and Other Receivables [Line Items]    
Gross amount 338,989 376,211
Allowance for doubtful accounts 0 0
Present value discount (4,682) (6,901)
Trade and other receivables 334,307 369,310
Non-current assets | Finance lease receivables    
Trade and Other Receivables [Line Items]    
Gross amount 1,118,537 898,658
Allowance for doubtful accounts (484) (842)
Present value discount 0 0
Trade and other receivables 1,118,053 897,816
Non-current assets | Others    
Trade and Other Receivables [Line Items]    
Gross amount 103,361 85,163
Allowance for doubtful accounts (7,438) (6,178)
Present value discount 0 0
Trade and other receivables ₩ 95,923 ₩ 78,985