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Available-for-sale Financial Assets (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2017
Dec. 31, 2016
Available-for-sale financial assets [Line Items]    
Acquisition cost ₩ 888,673  
Book value 699,833 ₩ 1,014,732
Fair value 661,907  
Listed equity securities    
Available-for-sale financial assets [Line Items]    
Acquisition cost 365,891  
Book value 274,453 268,171
Fair value ₩ 274,453  
Korea District Heating Corp.    
Available-for-sale financial assets [Line Items]    
Shares 2,264,068  
Ownership 19.55%  
Acquisition cost ₩ 173,201  
Book value 165,277  
Fair value ₩ 165,277  
Ssangyong Motor Co., Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 38,568  
Ownership 0.03%  
Acquisition cost ₩ 428  
Book value 197  
Fair value ₩ 197  
Sungjee Construction. Co., Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 10,530  
Ownership 0.01%  
Acquisition cost ₩ 49  
Book value 8  
Fair value ₩ 8  
Korea Line Corp.    
Available-for-sale financial assets [Line Items]    
Shares 18  
Ownership 0.00%  
Acquisition cost ₩ 1  
Namkwang Engineering & Construction Co., Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 46  
Ownership 0.00%  
Acquisition cost ₩ 15  
Bumyang Construction Co., Ltd.    
Available-for-sale financial assets [Line Items]    
Shares [1] 35  
Ownership [1] 0.00%  
Acquisition cost [1] ₩ 2  
ELCOMTEC Co., Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 32,875  
Ownership 0.04%  
Acquisition cost ₩ 217  
Book value 72  
Fair value ₩ 72  
PAN ocean Co., Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 1,492  
Ownership 0.00%  
Acquisition cost ₩ 14  
Book value 8  
Fair value ₩ 8  
Dongbu Corporation    
Available-for-sale financial assets [Line Items]    
Shares [2] 955  
Ownership [2] 0.02%  
Acquisition cost [2] ₩ 12  
Book value [2] 10  
Fair value [2] ₩ 10  
KSP Co., Ltd. [Member]    
Available-for-sale financial assets [Line Items]    
Shares 6,324  
Ownership 0.08%  
Acquisition cost ₩ 24  
Book value 24  
Fair value ₩ 24  
STX Heavy Industries Co., Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 35,749  
Ownership 0.14%  
Acquisition cost ₩ 191  
Book value 165  
Fair value ₩ 165  
PT Adaro Energy Tbk    
Available-for-sale financial assets [Line Items]    
Shares 480,000,000  
Ownership 1.50%  
Acquisition cost ₩ 71,554  
Book value 70,531  
Fair value ₩ 70,531  
Energy Fuels Inc.    
Available-for-sale financial assets [Line Items]    
Shares 1,711,814  
Ownership 2.38%  
Acquisition cost ₩ 16,819  
Book value 3,300  
Fair value ₩ 3,300  
Baralaba Coal Company Limited    
Available-for-sale financial assets [Line Items]    
Shares 99,763  
Ownership 0.07%  
Acquisition cost ₩ 18,445  
Book value 22  
Fair value ₩ 22  
Denison Mines Corp.    
Available-for-sale financial assets [Line Items]    
Shares 58,284,000  
Ownership 10.42%  
Acquisition cost ₩ 84,134  
Book value 34,292  
Fair value ₩ 34,292  
Fission 3.0 [Member]    
Available-for-sale financial assets [Line Items]    
Shares 300,000  
Ownership 0.14%  
Book value ₩ 15  
Fair value ₩ 15  
Fission Uranium Corp.    
Available-for-sale financial assets [Line Items]    
Shares 800,000  
Ownership 0.16%  
Acquisition cost ₩ 785  
Book value 532  
Fair value 532  
Unlisted equity securities    
Available-for-sale financial assets [Line Items]    
Acquisition cost [3] 522,782  
Book value 425,380 [3] ₩ 746,561
Fair value [3] ₩ 387,454  
Korea investment - Korea EXIM Bank CERs Private Special Assets Investment Trust I    
Available-for-sale financial assets [Line Items]    
Shares 1,758,731,002  
Ownership 14.18%  
Acquisition cost ₩ 1,752  
Book value ₩ 571  
Troika Overseas Resource Development Private Equity Firm    
Available-for-sale financial assets [Line Items]    
Shares 13,340,012,100  
Ownership 3.66%  
Acquisition cost ₩ 13,340  
Book value ₩ 1,553  
IBK-AUCTUS Green Growth Private Equity firm    
Available-for-sale financial assets [Line Items]    
Shares 152  
Ownership 6.29%  
Acquisition cost ₩ 41  
Book value ₩ 41  
Global Dynasty Overseas Resource Development Private Equity Firm    
Available-for-sale financial assets [Line Items]    
Shares 2,242,437,289  
Ownership 7.46%  
Acquisition cost ₩ 2,242  
Book value ₩ 2,242  
Intellectual Discovery, Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 1,000,000  
Ownership 8.81%  
Acquisition cost ₩ 5,000  
Book value ₩ 954  
Hanwha-KOSEP New Renewable Energy Private Special Assets Investment Trust 1    
Available-for-sale financial assets [Line Items]    
Shares 4,176,751,013  
Ownership 5.00%  
Acquisition cost ₩ 4,328  
Book value ₩ 4,328  
Construction Guarantee    
Available-for-sale financial assets [Line Items]    
Shares [4] 571  
Ownership [4] 0.02%  
Acquisition cost [4] ₩ 601  
Book value [4] 833  
Fair value [4] ₩ 833  
Plant & Mechanical Contractors Financial Cooperative of Korea    
Available-for-sale financial assets [Line Items]    
Shares 144  
Ownership 0.03%  
Acquisition cost ₩ 126  
Book value ₩ 126  
Fire Guarantee    
Available-for-sale financial assets [Line Items]    
Shares 40  
Ownership 0.01%  
Acquisition cost ₩ 20  
Book value ₩ 20  
Korea Software Financial Cooperative    
Available-for-sale financial assets [Line Items]    
Shares 5,186  
Ownership 1.09%  
Acquisition cost ₩ 3,301  
Book value ₩ 3,301  
Engineering Financial Cooperative    
Available-for-sale financial assets [Line Items]    
Shares 486  
Ownership 0.05%  
Acquisition cost ₩ 60  
Book value ₩ 60  
Electric Contractors Financial Cooperative    
Available-for-sale financial assets [Line Items]    
Shares 1,000  
Ownership 0.04%  
Acquisition cost ₩ 216  
Book value ₩ 216  
Korea Specialty Contractor Financial Cooperative    
Available-for-sale financial assets [Line Items]    
Shares 476  
Ownership 0.01%  
Acquisition cost ₩ 417  
Book value ₩ 417  
Information & Communication Financial Cooperative    
Available-for-sale financial assets [Line Items]    
Shares 121  
Ownership 0.02%  
Acquisition cost ₩ 26  
Book value ₩ 26  
Korea Electric Engineers Association    
Available-for-sale financial assets [Line Items]    
Shares 400  
Ownership 0.24%  
Acquisition cost ₩ 40  
Book value 40  
Samsung investment - Investment Pool for Public funds 1    
Available-for-sale financial assets [Line Items]    
Acquisition cost [5] 53,220  
Book value [5] 53,739  
Fair value [5] 53,739  
Korea investment - Hanwha KT Master Lease Private Special Investment Trust    
Available-for-sale financial assets [Line Items]    
Acquisition cost [5] 26,586  
Book value [5] 26,591  
Fair value [5] 26,591  
Kyobo Royal-Class Repo Plus Fixed Income 1Y 2nd    
Available-for-sale financial assets [Line Items]    
Acquisition cost [5] 33,000  
Book value [5] 33,008  
Fair value [5] 33,008  
Kyobo Royal-Class Repo Plus Fixed Income 2Y 1st    
Available-for-sale financial assets [Line Items]    
Acquisition cost [5] 50,000  
Book value [5] 50,399  
Fair value [5] 50,399  
Kyobo Royal-Class Repo Plus A1 ABCP 1Y    
Available-for-sale financial assets [Line Items]    
Acquisition cost [5] 50,000  
Book value [5] 50,419  
Fair value [5] ₩ 50,419  
Hwan Young Steel Co., Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 10,916  
Ownership 0.14%  
Acquisition cost ₩ 1,092  
Book value ₩ 97  
SAMBO AUTO. Co., Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 15,066  
Ownership 0.02%  
Acquisition cost ₩ 38  
Book value ₩ 38  
Mobo Co., Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 504  
Ownership 0.00%  
Acquisition cost ₩ 14  
Book value ₩ 14  
Dae Kwang Semiconductor Co., Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 589  
Ownership 0.07%  
Acquisition cost ₩ 6  
Book value ₩ 6  
Sanbon Department Store    
Available-for-sale financial assets [Line Items]    
Shares 828  
Ownership 0.01%  
Acquisition cost ₩ 124  
Book value ₩ 3  
Miju Steel Mfg. Co., Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 99,804  
Ownership 0.23%  
Acquisition cost ₩ 50  
Book value ₩ 50  
Sungwon Co., Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 589  
Ownership 0.07%  
Acquisition cost ₩ 15  
Book value ₩ 15  
Hana Civil Engineering Co., Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 23  
Ownership 0.00%  
Acquisition cost ₩ 1  
Book value ₩ 1  
KC Development Co., Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 839  
Ownership 0.02%  
Acquisition cost ₩ 6  
Book value ₩ 6  
IMHWA Corp.    
Available-for-sale financial assets [Line Items]    
Shares 329  
Ownership 0.11%  
Acquisition cost ₩ 5  
Book value ₩ 5  
DALIM Special Vehicle Co., Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 58  
Ownership 0.08%  
Acquisition cost ₩ 10  
Book value ₩ 10  
ASA JEONJU Co., Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 34,846  
Ownership 1.34%  
Acquisition cost ₩ 697  
Book value ₩ 69  
Moonkyung Silica Co., Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 42  
Ownership 0.56%  
Sungkwang Timber Co., Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 9  
Ownership 0.34%  
Acquisition cost ₩ 4  
Book value ₩ 4  
Yongbo Co., Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 61  
Ownership 0.20%  
Acquisition cost ₩ 3  
Book value ₩ 3  
HJ Steel Co., Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 218  
Ownership 0.07%  
Acquisition cost ₩ 2  
Book value ₩ 2  
KS Remicon Co., Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 12  
Ownership 0.04%  
Acquisition cost ₩ 3  
Book value ₩ 3  
Joongang Platec Co., Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 3,591  
Ownership 0.75%  
Acquisition cost ₩ 72  
Book value ₩ 35  
Pyungsan SI Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 434  
Ownership 0.01%  
Acquisition cost ₩ 9  
Book value ₩ 9  
Samgong Development Co., Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 12  
Ownership 0.01%  
Acquisition cost ₩ 7  
Book value ₩ 7  
Joongang Development Co., Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 540  
Ownership 0.12%  
Acquisition cost ₩ 8  
Book value ₩ 8  
AJS Co., Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 12,906  
Ownership 0.23%  
Acquisition cost ₩ 32  
Book value ₩ 32  
SHIN-E B&P Co., Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 119  
Ownership 0.13%  
Acquisition cost ₩ 10  
Book value ₩ 10  
MSE Co., Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 429  
Ownership 0.13%  
Acquisition cost ₩ 9  
Book value ₩ 9  
Ilrim Nano Tec Co., Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 1,520  
Ownership 0.07%  
Acquisition cost ₩ 15  
Book value ₩ 15  
Youngjin Hi-Tech Co., Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 2,512  
Ownership 0.25%  
Acquisition cost ₩ 126  
Book value ₩ 21  
Buyoung Co., Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 270  
Ownership 0.00%  
Acquisition cost ₩ 3  
Book value ₩ 3  
Ilsuk Co., Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 152  
Ownership 0.17%  
Acquisition cost ₩ 10  
Book value ₩ 10  
Dongyang Telecom Co., Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 1,760  
Ownership 0.01%  
Acquisition cost ₩ 11  
Book value ₩ 11  
Jongwon Remicon Co., Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 31  
Ownership 0.18%  
Acquisition cost ₩ 13  
Book value ₩ 13  
Ace Heat Treating Co., Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 477  
Ownership 1.43%  
Acquisition cost ₩ 72  
Book value ₩ 72  
Zyle Daewoo Motor Sales Co., Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 22  
Ownership 0.00%  
Daewoo Development Co., Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 8  
Ownership 0.00%  
Seyang Inc.    
Available-for-sale financial assets [Line Items]    
Shares 537  
Ownership 0.05%  
Acquisition cost ₩ 27  
Book value ₩ 27  
Seungri Enterprise Co., Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 93  
Ownership 0.05%  
Acquisition cost ₩ 3  
Book value ₩ 3  
Onggane Food Co., Ltd    
Available-for-sale financial assets [Line Items]    
Shares 5  
Ownership 0.07%  
Acquisition cost ₩ 1  
Book value ₩ 1  
Shin-E P&C Co., Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 12  
Ownership 0.00%  
Acquisition cost ₩ 1  
Book value ₩ 1  
Ejung Ad Co., Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 132  
Ownership 0.09%  
Acquisition cost ₩ 3  
Book value ₩ 3  
Solvus Co., Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 1,056  
Ownership 0.04%  
Acquisition cost ₩ 3  
Book value ₩ 3  
Myung Co., Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 89  
Ownership 0.05%  
Acquisition cost ₩ 2  
Book value ₩ 2  
Shinil Engineering Co., Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 887  
Ownership 0.06%  
Acquisition cost ₩ 3  
Book value ₩ 3  
Biwang Industry Co., Ltd    
Available-for-sale financial assets [Line Items]    
Shares 406  
Ownership 0.04%  
Acquisition cost ₩ 2  
Book value ₩ 2  
Huimun Co., Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 263  
Ownership 0.26%  
Acquisition cost ₩ 4  
Book value ₩ 4  
Young Sung Co., Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 89  
Ownership 0.40%  
Acquisition cost ₩ 26  
Book value ₩ 26  
Yuil Industrial Electronics Co., Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 804  
Ownership 0.32%  
Acquisition cost ₩ 15  
Book value ₩ 15  
DN TEK Inc.    
Available-for-sale financial assets [Line Items]    
Shares 12,401  
Ownership 0.29%  
Acquisition cost ₩ 61  
Book value ₩ 5  
Kwang Jin Structure Co., Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 3,072  
Ownership 0.60%  
Acquisition cost ₩ 31  
Book value ₩ 31  
Woojin Industry Corporation    
Available-for-sale financial assets [Line Items]    
Shares 3  
Ownership 0.00%  
Acquisition cost ₩ 16  
Book value ₩ 16  
Kwang Sung Industry Co., Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 325  
Ownership 0.35%  
Acquisition cost ₩ 7  
Book value ₩ 7  
Futech Mold Co., Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 274  
Ownership 0.27%  
Acquisition cost ₩ 14  
Book value ₩ 14  
Woojoo Environment Ind. Co., Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 101  
Ownership 0.11%  
Acquisition cost ₩ 13  
Book value ₩ 13  
Cheongatti Co., Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 57  
Ownership 0.10%  
Acquisition cost ₩ 4  
Book value ₩ 4  
Hyungji Esquire Co., Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 55  
Ownership 0.02%  
Acquisition cost ₩ 22  
Book value ₩ 22  
Kolmar Pharma Co., Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 1,426  
Ownership 0.01%  
Acquisition cost ₩ 52  
Book value ₩ 3  
Morado Co., Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 209  
Ownership 0.04%  
Acquisition cost ₩ 2  
Book value ₩ 2  
Myung Sung Tex Co., Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 20  
Ownership 0.00%  
Acquisition cost ₩ 2  
Book value ₩ 2  
Kwang Sung Co., Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 610  
Ownership 0.53%  
Acquisition cost ₩ 31  
Book value ₩ 31  
EverTechno. Co.,Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 29,424  
Ownership 0.73%  
Acquisition cost ₩ 148  
Book value ₩ 7  
Autowel Co.,Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 260  
Ownership 0.38%  
Acquisition cost ₩ 14  
Book value ₩ 14  
Woobang Construction Co., Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 8  
Ownership 0.00%  
Acquisition cost ₩ 8  
Book value ₩ 8  
Shin Pyung Co., Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 6  
Ownership 0.03%  
Acquisition cost ₩ 3  
Book value ₩ 3  
JMC Heavy Industries Co., Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 2,724  
Ownership 0.10%  
Acquisition cost ₩ 27  
Book value ₩ 27  
Najin Steel Co., Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 37  
Ownership 0.06%  
Acquisition cost ₩ 5  
Book value ₩ 5  
Sinkwang Industry Co., Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 1,091  
Ownership 1.68%  
Acquisition cost ₩ 5  
Book value ₩ 5  
Crystal Co., Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 22  
Ownership 0.07%  
Acquisition cost ₩ 2  
Book value ₩ 2  
Elephant & Friends Co., Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 563  
Ownership 0.61%  
Acquisition cost ₩ 3  
Book value ₩ 3  
Mireco Co., Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 109  
Ownership 0.25%  
Acquisition cost ₩ 11  
Book value ₩ 11  
L&K Industry Co., Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 1,615  
Ownership 0.60%  
Acquisition cost ₩ 24  
Book value ₩ 24  
JO Tech Co., Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 1,263  
Ownership 0.62%  
Acquisition cost ₩ 25  
Book value ₩ 25  
Kendae Printing Co., Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 422  
Ownership 0.60%  
Acquisition cost ₩ 21  
Book value ₩ 21  
Dauning Co., Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 231  
Ownership 0.41%  
Acquisition cost ₩ 6  
Book value ₩ 6  
Korea Trecision Co., Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 22  
Ownership 0.45%  
Acquisition cost ₩ 5  
Book value ₩ 5  
Ace Track Co., Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 3,130  
Ownership 1.08%  
Acquisition cost ₩ 219  
Book value ₩ 59  
Taebok Machinery Co., Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 109  
Ownership 1.08%  
Acquisition cost ₩ 11  
Book value ₩ 11  
Yoo-A Construction Co., Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 105  
Ownership 0.20%  
Acquisition cost ₩ 11  
Book value ₩ 11  
Dung Hwan Co., Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 531  
Ownership 0.02%  
Acquisition cost ₩ 5  
Book value ₩ 5  
Hurim Biocell Co., Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 113  
Ownership 0.00%  
Acquisition cost ₩ 5  
Book value ₩ 5  
Sunjin Power Tech Co., Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 4,941  
Ownership 0.92%  
Acquisition cost ₩ 247  
Book value ₩ 32  
Smart Power Co.,Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 133,333  
Ownership 4.83%  
Acquisition cost ₩ 200  
Book value ₩ 200  
Haseung Industries Co.,Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 55  
Ownership 0.62%  
Acquisition cost ₩ 28  
Book value ₩ 28  
Beer Yeast Korea Inc.    
Available-for-sale financial assets [Line Items]    
Shares 1,388  
Ownership 0.43%  
Acquisition cost ₩ 7  
Book value ₩ 7  
Daeryung Corporation    
Available-for-sale financial assets [Line Items]    
Shares 207  
Ownership 0.19%  
Acquisition cost ₩ 10  
Book value ₩ 10  
Korea Bio Red Ginseng Co.,Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 194  
Ownership 0.09%  
Acquisition cost ₩ 10  
Book value ₩ 10  
ENH Co.,Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 1,086  
Ownership 0.19%  
Acquisition cost ₩ 54  
Book value ₩ 54  
B CON Co.,Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 96  
Ownership 1.16%  
Acquisition cost ₩ 6  
Book value ₩ 6  
Chunil Metal Co., Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 11  
Ownership 0.15%  
Acquisition cost ₩ 4  
Book value ₩ 4  
SsangMa Machine Co., Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 4  
Ownership 0.05%  
Acquisition cost ₩ 1  
Book value ₩ 1  
SinJin Co., Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 233  
Ownership 0.30%  
Acquisition cost ₩ 9  
Book value ₩ 9  
Ace Integration Co., Ltd    
Available-for-sale financial assets [Line Items]    
Shares 105  
Ownership 0.09%  
Acquisition cost ₩ 24  
Book value ₩ 24  
AceInti Agricultural Co., Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 16  
Ownership 0.02%  
Acquisition cost ₩ 5  
Book value ₩ 5  
KyungDong Co., Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 130  
Ownership 0.01%  
Acquisition cost ₩ 1  
Book value ₩ 1  
ChunWon Development Co., Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 193  
Ownership 0.19%  
Acquisition cost ₩ 39  
Book value ₩ 39  
WonIl Co., Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 999  
Ownership 0.15%  
Acquisition cost ₩ 50  
Book value ₩ 50  
SungLim Industrial Co., Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 29  
Ownership 0.03%  
Acquisition cost ₩ 1  
Book value ₩ 1  
Korea Minerals Co., Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 191  
Ownership 0.05%  
Acquisition cost ₩ 134  
Book value ₩ 1  
HyoDong Development Co., Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 119  
Ownership 0.15%  
Acquisition cost ₩ 24  
Book value ₩ 24  
Haspe Tech Co., Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 652  
Ownership 0.55%  
Acquisition cost ₩ 20  
Book value ₩ 20  
JoHyun Co., Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 350  
Ownership 1.56%  
Acquisition cost ₩ 18  
Book value ₩ 18  
KC Co., Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 5,107  
Ownership 0.17%  
Acquisition cost ₩ 3  
Book value ₩ 3  
SeongJi Industrial Co.,Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 41  
Ownership 0.05%  
Acquisition cost ₩ 1  
Book value ₩ 1  
Navanakorn Electric Co., Ltd.    
Available-for-sale financial assets [Line Items]    
Shares [6] 4,442,800  
Ownership [6] 26.93%  
Acquisition cost [6] ₩ 17,216  
Book value [6] ₩ 16,410  
PT. Kedap Saayq    
Available-for-sale financial assets [Line Items]    
Shares 671  
Ownership 10.00%  
Acquisition cost ₩ 18,540  
Set Holding    
Available-for-sale financial assets [Line Items]    
Shares [7] 1,100,220  
Ownership [7] 2.50%  
Acquisition cost [7] ₩ 229,255  
Book value [7] 171,242  
Fair value [7] ₩ 171,242  
PT. Cirebon Energi Prasarana    
Available-for-sale financial assets [Line Items]    
Shares 22,420  
Ownership 10.00%  
Acquisition cost ₩ 2,612  
Book value ₩ 2,401  
DongKwang SD, Inc.    
Available-for-sale financial assets [Line Items]    
Shares 524  
Ownership 0.23%  
Acquisition cost ₩ 13  
Book value ₩ 13  
Dong Yang Metal Co., Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 2,951  
Ownership 1.97%  
Acquisition cost ₩ 15  
Book value ₩ 15  
Seyang Precision Ind.Co., Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 829  
Ownership 0.23%  
Acquisition cost ₩ 41  
Book value ₩ 41  
Dooriwon Food System Co., Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 13  
Ownership 0.27%  
Acquisition cost ₩ 1  
Book value ₩ 1  
ShinShin Co., Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 339  
Ownership 1.12%  
Acquisition cost ₩ 17  
Book value ₩ 17  
Kitorang Co., Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 165  
Ownership 0.24%  
Acquisition cost ₩ 49  
Book value ₩ 49  
Sung Kwang Co., Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 23  
Ownership 0.37%  
Acquisition cost ₩ 6  
Book value ₩ 6  
Hyundai Metal Co., Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 3,757  
Ownership 5.60%  
Acquisition cost ₩ 1,416  
Book value ₩ 1,416  
Shinheung petrol. Co. Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 699  
Ownership 0.14%  
Acquisition cost ₩ 7  
Book value ₩ 7  
Force TEC Co., Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 3,501  
Ownership 0.02%  
Acquisition cost ₩ 18  
Book value ₩ 18  
Haisung Industrial Systems Co., Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 10,751  
Ownership 0.24%  
Acquisition cost ₩ 54  
Book value ₩ 54  
Samsung Tech Co., Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 486  
Ownership 1.28%  
Acquisition cost ₩ 97  
Book value ₩ 97  
Tae Hyung Co., Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 28  
Ownership 0.43%  
Acquisition cost ₩ 20  
Book value ₩ 20  
Samyangplant Co., Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 323  
Ownership 0.60%  
Acquisition cost ₩ 16  
Book value ₩ 16  
Younil Metal Co., Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 41  
Ownership 0.21%  
Acquisition cost ₩ 21  
Book value ₩ 21  
Myungjin Tech Co., Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 20  
Ownership 0.54%  
Acquisition cost ₩ 4  
Book value ₩ 4  
Hankook Machine Tools Co., Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 719  
Ownership 0.14%  
Acquisition cost ₩ 72  
Book value ₩ 72  
Hankook Precision Ind Co., Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 110  
Ownership 0.06%  
Acquisition cost ₩ 11  
Book value ₩ 11  
Borneo International Furniture Co., Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 64,037  
Ownership 0.28%  
Acquisition cost ₩ 97  
Book value ₩ 14  
CJ Paradise Co.,Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 24  
Ownership 0.02%  
Acquisition cost ₩ 12  
Book value ₩ 12  
Han Young Technology Company Co.,Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 35  
Ownership 0.00%  
Jungdo Aluminium Co.,Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 8,527  
Ownership 0.35%  
Acquisition cost ₩ 128  
Book value ₩ 128  
Ilheung Metal Co, Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 280  
Ownership 0.83%  
Acquisition cost ₩ 28  
Book value ₩ 28  
STX Offshore & Shipbuilding Co., Ltd    
Available-for-sale financial assets [Line Items]    
Shares 8,622  
Ownership 0.25%  
Acquisition cost ₩ 1,078  
Book value ₩ 1,078  
Ptotronics Co., Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 151  
Ownership 0.07%  
Acquisition cost ₩ 2  
Book value ₩ 2  
NFT Co., Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 136  
Ownership 0.40%  
Acquisition cost ₩ 8  
Book value ₩ 8  
Echoroba Co.,Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 157  
Ownership 0.02%  
Acquisition cost ₩ 3  
Book value ₩ 3  
Hyundaitech Co.,Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 1,363  
Ownership 0.87%  
Acquisition cost ₩ 27  
Book value ₩ 27  
Eco Alux Co.,Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 239  
Ownership 0.22%  
Acquisition cost ₩ 48  
Book value ₩ 48  
Daekyung Industry Co.,Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 9,112  
Ownership 0.94%  
Acquisition cost ₩ 13  
Book value ₩ 13  
Dasan Material Co.Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 29  
Ownership 0.04%  
Fish World Co.,Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 47  
Ownership 0.21%  
Acquisition cost ₩ 2  
Book value ₩ 2  
SG Shinsung Engineering and Construction Co., Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 10  
Ownership 0.00%  
Acquisition cost ₩ 6  
Book value ₩ 6  
Samdo Industry Electric Co.,Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 48  
Ownership 0.02%  
Acquisition cost ₩ 1  
Book value ₩ 1  
Taejung Industries Co.,Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 9,268  
Ownership 0.30%  
Acquisition cost ₩ 5  
Book value ₩ 5  
Shinsei Trading Co., Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 64  
Ownership 0.72%  
Acquisition cost ₩ 1  
Book value ₩ 1  
Dynamic Co., Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 111  
Ownership 0.19%  
Acquisition cost ₩ 3  
Book value ₩ 3  
Green Alchemy Co.,Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 38,202  
Ownership 1.48%  
Acquisition cost ₩ 191  
Book value ₩ 191  
IQ Power Asia Inc.    
Available-for-sale financial assets [Line Items]    
Shares 16,179  
Ownership 0.31%  
Acquisition cost ₩ 81  
Book value ₩ 81  
Youone TBM Engineering & Construction Co., Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 227,854  
Ownership 0.27%  
Acquisition cost ₩ 31  
Book value ₩ 31  
KM Leatech    
Available-for-sale financial assets [Line Items]    
Shares 1,648  
Ownership 0.98%  
Acquisition cost ₩ 8  
Book value ₩ 8  
Wonil T&I Co., Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 229  
Ownership 0.17%  
Acquisition cost ₩ 23  
Book value ₩ 23  
Semist Co.,Ltd.    
Available-for-sale financial assets [Line Items]    
Shares 555  
Ownership 0.80%  
Acquisition cost ₩ 3  
Book value ₩ 3  
DS POWER Co., Ltd.    
Available-for-sale financial assets [Line Items]    
Shares [8] 580,000  
Ownership [8] 2.34%  
Acquisition cost [8] ₩ 2,900  
Book value [8] 1,223  
Fair value [8] ₩ 1,223  
[1] The number of shares increased due to the stock split (5:1).
[2] The number of shares owned has changed due to the stock merge (9:7) during the year ended December 31, 2017.
[3] Investments in unlisted equity securities held by the Company for which a quoted market price does not exist in an active market and fair value cannot be measured reliably were measured at cost less impairment, if any.
[4] The Company has estimated the fair value of the investment in Construction Guarantee based upon the price which would be applied when the investment is returned. The Company has recognized the difference between its fair value and book value as a gain or loss on valuation of available-for-sale financial assets in other comprehensive income or loss during the year ended December 31, 2017.
[5] As of December 31, 2017, the Company invested in KRW214,156 million as beneficiary securities exclusively for payment of decommissioning cost of nuclear power plants. The Company has measured the fair value of the beneficiary securities based on its net asset value.
[6] Although the Company holds more than 20% of the equity shares of these investments, the Company cannot exercise significant influence.
[7] The Company has estimated the fair value of Set Holding by using the discounted cash flow method and has recognized the difference between its fair value and book value as gain or loss on valuation of available-for-sale financial assets in other comprehensive income or loss during the year ended December 31, 2017.
[8] As described in note 20, this is reclassified to available-for-sale financial assets due to loss of significant influence of the Company.