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Trade and Other Receivables - Trade and other receivables (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2020
Dec. 31, 2019
Trade and Other Receivables [Line Items]    
Gross amount ₩ 10,126,268 ₩ 10,038,021
Allowance for doubtful accounts (341,369) (326,914)
Present value discount (4,860) (7,358)
Trade and other receivables 9,780,039 9,703,749
Current assets    
Trade and Other Receivables [Line Items]    
Gross amount 8,170,521 7,939,830
Allowance for doubtful accounts (250,516) (236,084)
Present value discount (1,535) (2,294)
Trade and other receivables 7,918,470 7,701,452
Current assets | Trade receivables    
Trade and Other Receivables [Line Items]    
Gross amount 7,370,923 7,147,683
Allowance for doubtful accounts (208,184) (208,505)
Present value discount 0 0
Trade and other receivables 7,162,739 6,939,178
Current assets | Other receivables    
Trade and Other Receivables [Line Items]    
Gross amount 799,598 792,147
Allowance for doubtful accounts (42,332) (27,579)
Present value discount (1,535) (2,294)
Trade and other receivables 755,731 762,274
Current assets | Non-trade receivables    
Trade and Other Receivables [Line Items]    
Gross amount 441,031 376,438
Allowance for doubtful accounts (37,062) (27,201)
Present value discount 0 0
Trade and other receivables 403,969 349,237
Current assets | Accrued income    
Trade and Other Receivables [Line Items]    
Gross amount 38,956 68,921
Allowance for doubtful accounts 0 0
Present value discount 0 0
Trade and other receivables 38,956 68,921
Current assets | Deposits    
Trade and Other Receivables [Line Items]    
Gross amount 239,011 273,887
Allowance for doubtful accounts 0 0
Present value discount (1,535) (2,294)
Trade and other receivables 237,476 271,593
Current assets | Finance lease receivables    
Trade and Other Receivables [Line Items]    
Gross amount 57,084 [1] 60,304 [2]
Allowance for doubtful accounts (365) (378)
Present value discount 0 0
Trade and other receivables 56,719 59,926
Current assets | Others    
Trade and Other Receivables [Line Items]    
Gross amount 23,516 12,597
Allowance for doubtful accounts (4,905) 0
Present value discount 0 0
Trade and other receivables 18,611 12,597
Non-current assets    
Trade and Other Receivables [Line Items]    
Gross amount 1,955,747 2,098,191
Allowance for doubtful accounts (90,853) (90,830)
Present value discount (3,325) (5,064)
Trade and other receivables 1,861,569 2,002,297
Non-current assets | Trade receivables    
Trade and Other Receivables [Line Items]    
Gross amount 227,261 338,261
Allowance for doubtful accounts (806) (4,254)
Present value discount 0 (382)
Trade and other receivables 226,455 333,625
Non-current assets | Other receivables    
Trade and Other Receivables [Line Items]    
Gross amount 1,728,486 1,759,930
Allowance for doubtful accounts (90,047) (86,576)
Present value discount (3,325) (4,682)
Trade and other receivables 1,635,114 1,668,672
Non-current assets | Non-trade receivables    
Trade and Other Receivables [Line Items]    
Gross amount 215,136 196,821
Allowance for doubtful accounts (80,451) (78,654)
Present value discount 0 0
Trade and other receivables 134,685 118,167
Non-current assets | Accrued income    
Trade and Other Receivables [Line Items]    
Gross amount 834 2,222
Allowance for doubtful accounts 0 0
Present value discount 0 0
Trade and other receivables 834 2,222
Non-current assets | Deposits    
Trade and Other Receivables [Line Items]    
Gross amount 364,855 338,989
Allowance for doubtful accounts 0 0
Present value discount (3,325) (4,682)
Trade and other receivables 361,530 334,307
Non-current assets | Finance lease receivables    
Trade and Other Receivables [Line Items]    
Gross amount 1,065,982 [3] 1,118,537 [4]
Allowance for doubtful accounts (625) (484)
Present value discount 0 0
Trade and other receivables 1,065,357 1,118,053
Non-current assets | Others    
Trade and Other Receivables [Line Items]    
Gross amount 81,679 103,361
Allowance for doubtful accounts (8,971) (7,438)
Present value discount 0 0
Trade and other receivables ₩ 72,708 ₩ 95,923
[1] Gross amount of finance lease receivables is the net lease investment by deducting unearned finance income of KRW 105,127 million.
[2] Gross amount of finance lease receivables is the net lease investment by deducting unearned finance income of KRW 112,789 million.
[3] Gross amount of finance lease receivables is the net lease investment by deducting unearned finance income of KRW 1,087,559 million.
[4] Gross amount of finance lease receivables is the net lease investment by deducting unearned finance income of KRW 1,218,934 million.