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Trade and Other Receivables - Trade and other receivables (Details) - KRW (₩) ₩ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Trade and other current receivables [Abstract] |  |
Trade receivables | ₩ 7,087,290 | ₩ 7,325,702
Other receivables | 706,302 | 603,270
Non-trade receivables | 278,647 | 305,057
Accrued income | 102,023 | 54,002
Deposits | 226,439 | 226,574
Finance lease receivables | 84,397 | 13,067
Others | 14,796 | 4,570
Subtotal of current tade and other receivables | 7,793,592 | 7,928,972
Trade and other non-current receivables [Abstract] |  |
Trade receivables | 414,777 | 448,777
Other non-current receivables | 1,405,068 | 1,306,020
Non-trade receivables | 58,957 | 53,866
Accrued income |  | 182
Deposits | 369,310 | 324,917
Finance lease receivables | 897,816 | 849,554
Others | 78,985 | 77,501
Subtotal of non-current tade and other receivables | 1,819,845 | 1,754,797
Other receivables | 2,111,370 | 1,909,290
Gross amount |  |
Trade and other current receivables [Abstract] |  |
Trade receivables | 7,303,065 | 7,499,285
Other receivables | 728,560 | 614,212
Non-trade receivables | 298,587 | 314,256
Accrued income | 102,023 | 54,002
Deposits | 228,466 | 228,317
Finance lease receivables | 84,688 | 13,067
Others | 14,796 | 4,570
Subtotal of current tade and other receivables | 8,031,625 | 8,113,497
Trade and other non-current receivables [Abstract] |  |
Trade receivables | 415,318 | 449,191
Other non-current receivables | 1,496,464 | 1,380,983
Non-trade receivables | 136,432 | 112,983
Accrued income |  | 182
Deposits | 376,211 | 331,071
Finance lease receivables | 898,658 | 849,554
Others | 85,163 | 87,193
Subtotal of non-current tade and other receivables | 1,911,782 | 1,830,174
Other receivables | 2,225,024 | 1,995,195
Allowance for doubtful accounts |  |
Trade and other current receivables [Abstract] |  |
Trade receivables | (215,775) | (173,583)
Other receivables | (20,231) | (9,199)
Non-trade receivables | (19,940) | (9,199)
Accrued income | 0 | 0
Deposits | 0 | 0
Finance lease receivables | (291) | 0
Others | 0 | 0
Subtotal of current tade and other receivables | (236,006) | (182,782)
Trade and other non-current receivables [Abstract] |  |
Trade receivables | (93) | 0
Other non-current receivables | (84,495) | (68,809)
Non-trade receivables | (77,475) | (59,117)
Accrued income |  | 0
Deposits | 0 | 0
Finance lease receivables | (842) | 0
Others | (6,178) | (9,692)
Subtotal of non-current tade and other receivables | (84,588) | (68,809)
Other receivables | (104,726) | (78,008)
Present value discount |  |
Trade and other current receivables [Abstract] |  |
Trade receivables | 0 | 0
Other receivables | (2,027) | (1,743)
Non-trade receivables | 0 | 0
Accrued income | 0 | 0
Deposits | (2,027) | (1,743)
Finance lease receivables | 0 | 0
Others | 0 | 0
Subtotal of current tade and other receivables | (2,027) | (1,743)
Trade and other non-current receivables [Abstract] |  |
Trade receivables | (448) | (414)
Other non-current receivables | (6,901) | (6,154)
Non-trade receivables | 0 | 0
Accrued income |  | 0
Deposits | (6,901) | (6,154)
Finance lease receivables | 0 | 0
Others | 0 | 0
Subtotal of non-current tade and other receivables | (7,349) | (6,568)
Other receivables | ₩ (8,928) | ₩ (7,897)

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- Definition The amount of non-current trade receivables. [Refer: Trade receivables] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 78 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_78_b&doctype=Standard -URIDate 2018-03-16 + Details
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