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Trade and Other Receivables - Trade and other receivables (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2017
Dec. 31, 2016
Trade and other current receivables [Abstract]    
Trade receivables ₩ 7,325,702 ₩ 7,188,242
Other receivables 603,270 600,634
Non-trade receivables 305,057 309,950
Accrued income 54,002 62,063
Deposits 226,574 191,643
Finance lease receivables 13,067 12,225
Others 4,570 24,753
Subtotal of current tade and other receivables 7,928,972 7,788,876
Trade and other non-current receivables [Abstract]    
Trade receivables 448,777 491,509
Other non-current receivables 1,306,020 1,412,006
Non-trade receivables 53,866 53,451
Accrued income 182 174
Deposits 324,917 314,671
Finance lease receivables 849,554 960,649
Others 77,501 83,061
Subtotal of non-current tade and other receivables 1,754,797 1,903,515
Total trade and other receivables 9,683,769 9,692,391
Gross amount [Member]    
Trade and other current receivables [Abstract]    
Trade receivables 7,499,285 7,260,227
Other receivables 614,212 652,782
Non-trade receivables 314,256 360,021
Accrued income 54,002 62,063
Deposits 228,317 193,720
Finance lease receivables 13,067 12,225
Others 4,570 24,753
Subtotal of current tade and other receivables 8,113,497 7,913,009
Trade and other non-current receivables [Abstract]    
Trade receivables 449,191 491,509
Other non-current receivables 1,380,983 1,455,860
Non-trade receivables 112,983 80,393
Accrued income 182 174
Deposits 331,071 320,935
Finance lease receivables 849,554 960,649
Others 87,193 93,709
Subtotal of non-current tade and other receivables 1,830,174 1,947,369
Total trade and other receivables 9,943,671 9,860,378
Allowance for Doubtful Accounts [Member]    
Trade and other current receivables [Abstract]    
Trade receivables (173,583) (71,985)
Other receivables (9,199) (50,071)
Non-trade receivables (9,199) (50,071)
Accrued income 0 0
Deposits 0 0
Finance lease receivables 0 0
Others 0 0
Subtotal of current tade and other receivables (182,782) (122,056)
Trade and other non-current receivables [Abstract]    
Trade receivables 0 0
Other non-current receivables (68,809) (37,590)
Non-trade receivables (59,117) (26,942)
Accrued income 0 0
Deposits 0 0
Finance lease receivables 0 0
Others (9,692) (10,648)
Subtotal of non-current tade and other receivables (68,809) (37,590)
Total trade and other receivables (251,591) (159,646)
Present value discount [Member]    
Trade and other current receivables [Abstract]    
Trade receivables 0 0
Other receivables (1,743) (2,077)
Non-trade receivables 0 0
Accrued income 0 0
Deposits (1,743) (2,077)
Finance lease receivables 0 0
Others 0 0
Subtotal of current tade and other receivables (1,743) (2,077)
Trade and other non-current receivables [Abstract]    
Trade receivables (414) 0
Other non-current receivables (6,154) (6,264)
Non-trade receivables 0 0
Accrued income 0 0
Deposits (6,154) (6,264)
Finance lease receivables 0 0
Others 0 0
Subtotal of non-current tade and other receivables (6,568) (6,264)
Total trade and other receivables ₩ (8,311) ₩ (8,341)