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Trade and Other Receivables - Trade and other receivables (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2018
Dec. 31, 2017
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)