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Trade and Other Receivables - Trade and Other Receivables (Details) - KRW (₩) ₩ in Millions | Dec. 31, 2021 | Dec. 31, 2020
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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.

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