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Available-for-sale Financial Assets (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Available-for-sale financial assets [Line Items]      
Acquisition cost ₩ 888,673 ₩ 1,406,326  
Book value 699,833 1,014,732 ₩ 584,479
Fair value 661,907 974,647  
Listed equity securities [Member]      
Available-for-sale financial assets [Line Items]      
Acquisition cost 365,891 365,773  
Book value 274,453 268,171  
Fair value ₩ 274,453 ₩ 268,171  
Korea District Heating Corp. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 2,264,068 2,264,068  
Ownership 19.55% 19.55%  
Acquisition cost ₩ 173,201 ₩ 173,201  
Book value 165,277 154,183  
Fair value ₩ 165,277 ₩ 154,183  
Ssangyong Motor Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 38,568 38,568  
Ownership 0.03% 0.03%  
Acquisition cost ₩ 428 ₩ 428  
Book value 197 304  
Fair value ₩ 197 ₩ 304  
Sungjee Construction. Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 10,530 10,530  
Ownership 0.01% 0.01%  
Acquisition cost ₩ 49 ₩ 49  
Book value 8 21  
Fair value ₩ 8 ₩ 21  
Korea Line Corp. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 18 18  
Ownership 0.00% 0.00%  
Acquisition cost ₩ 1 ₩ 1  
Namkwang Engineering & Construction Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 46 46  
Ownership 0.00% 0.00%  
Acquisition cost ₩ 15 ₩ 15  
Pumyang Construction Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 35 [1] 7  
Ownership 0.00% [1] 0.00%  
Acquisition cost ₩ 2 [1] ₩ 2  
ELCOMTEC Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 32,875 32,875  
Ownership 0.04% 0.04%  
Acquisition cost ₩ 217 ₩ 217  
Book value 72 74  
Fair value ₩ 72 ₩ 74  
PAN ocean Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 1,492 1,492  
Ownership 0.00% 0.00%  
Acquisition cost ₩ 14 ₩ 14  
Book value 8 7  
Fair value ₩ 8 ₩ 7  
Borneo International Furniture Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares   64,037  
Ownership   0.28%  
Acquisition cost   ₩ 97  
Book value   103  
Fair value   ₩ 103  
Dongbu Corporation [Member]      
Available-for-sale financial assets [Line Items]      
Shares 955 [2] 1,229  
Ownership 0.02% [2] 0.02%  
Acquisition cost ₩ 12 [2] ₩ 12  
Book value 10 [2] 12  
Fair value ₩ 10 [2] ₩ 12  
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. [Member]      
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 [Member]      
Available-for-sale financial assets [Line Items]      
Shares 480,000,000 480,000,000  
Ownership 1.50% 1.50%  
Acquisition cost ₩ 71,554 ₩ 71,554  
Book value 70,531 73,061  
Fair value ₩ 70,531 ₩ 73,061  
Energy Fuels Inc. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 1,711,814 1,711,814  
Ownership 2.38% 2.59%  
Acquisition cost ₩ 16,819 ₩ 16,819  
Book value 3,300 3,385  
Fair value ₩ 3,300 ₩ 3,385  
Baralaba Coal Company Limited [Member]      
Available-for-sale financial assets [Line Items]      
Shares 99,763 99,763 [3]  
Ownership 0.07% 0.07% [3]  
Acquisition cost ₩ 18,445 ₩ 18,445 [3]  
Book value 22 42 [3]  
Fair value ₩ 22 ₩ 42 [3]  
Denison Mines Corp. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 58,284,000 58,284,000  
Ownership 10.42% 10.93%  
Acquisition cost ₩ 84,134 ₩ 84,134  
Book value 34,292 36,504  
Fair value ₩ 34,292 ₩ 36,504  
Fission 3.0 [Member]      
Available-for-sale financial assets [Line Items]      
Shares 300,000 300,000  
Ownership 0.14% 0.17%  
Book value ₩ 15 ₩ 16  
Fair value ₩ 15 ₩ 16  
Fission Uranium Corp. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 800,000 800,000  
Ownership 0.16% 0.17%  
Acquisition cost ₩ 785 ₩ 785  
Book value 532 459  
Fair value 532 459  
Unlisted equity securities [Member]      
Available-for-sale financial assets [Line Items]      
Acquisition cost [4] 522,782 1,040,553  
Book value [4] 425,380 746,561  
Fair value [4] ₩ 387,454 ₩ 706,476  
K&C - Gyeongnam youth job creation Investment Fund [Member]      
Available-for-sale financial assets [Line Items]      
Shares   24  
Ownership   10.00%  
Acquisition cost   ₩ 1,207  
Book value   ₩ 1,207  
Korea investment – Korea EXIM Bank CERs Private Special Assets Investment Trust I [Member]      
Available-for-sale financial assets [Line Items]      
Shares 1,758,731,002 1,758,731,002  
Ownership 14.18% 14.18%  
Acquisition cost ₩ 1,752 ₩ 1,752  
Book value ₩ 571 ₩ 571  
Troika Overseas Resource Development Private Equity Firm [Member]      
Available-for-sale financial assets [Line Items]      
Shares 13,340,012,100 13,340,012,100  
Ownership 3.66% 3.66%  
Acquisition cost ₩ 13,340 ₩ 13,340  
Book value ₩ 1,553 ₩ 1,553  
IBK-AUCTUS Green Growth Private Equity firm [Member]      
Available-for-sale financial assets [Line Items]      
Shares 152 152  
Ownership 6.29% 6.29%  
Acquisition cost ₩ 41 ₩ 41  
Book value ₩ 41 ₩ 41  
Global Dynasty Overseas Resource Development Private Equity Firm [Member]      
Available-for-sale financial assets [Line Items]      
Shares 2,242,437,289 2,233,407,439  
Ownership 7.46% 7.46%  
Acquisition cost ₩ 2,242 ₩ 2,233  
Book value ₩ 2,242 ₩ 2,233  
Intellectual Discovery, Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 1,000,000 1,000,000  
Ownership 8.81% 8.81%  
Acquisition cost ₩ 5,000 ₩ 5,000  
Book value ₩ 954 ₩ 1,375  
Hanwha-KOSEP New Renewable Energy Private Special Assets Investment Trust 1 [Member]      
Available-for-sale financial assets [Line Items]      
Shares 4,176,751,013 4,256,096,329  
Ownership 5.00% 5.00%  
Acquisition cost ₩ 4,328 ₩ 4,389  
Book value ₩ 4,328 ₩ 4,389  
Construction Guarantee [Member]      
Available-for-sale financial assets [Line Items]      
Shares 571 [5] 571 [6]  
Ownership 0.02% [5] 0.02% [6]  
Acquisition cost ₩ 601 [5] ₩ 601 [6]  
Book value 833 [5] 819 [6]  
Fair value ₩ 833 [5] ₩ 819 [6]  
Plant & Mechanical Contractors Financial Cooperative of Korea [Member]      
Available-for-sale financial assets [Line Items]      
Shares 144 50  
Ownership 0.03% 0.01%  
Acquisition cost ₩ 126 ₩ 36  
Book value ₩ 126 ₩ 36  
Fire Guarantee [Member]      
Available-for-sale financial assets [Line Items]      
Shares 40 40  
Ownership 0.01% 0.02%  
Acquisition cost ₩ 20 ₩ 20  
Book value ₩ 20 ₩ 20  
Korea Software Financial Cooperative [Member]      
Available-for-sale financial assets [Line Items]      
Shares 5,186 5,186  
Ownership 1.09% 1.39%  
Acquisition cost ₩ 3,301 ₩ 3,301  
Book value ₩ 3,301 ₩ 3,301  
Engineering Financial Cooperative [Member]      
Available-for-sale financial assets [Line Items]      
Shares 486 486  
Ownership 0.05% 0.05%  
Acquisition cost ₩ 60 ₩ 60  
Book value ₩ 60 ₩ 60  
Electric Contractors Financial Cooperative [Member]      
Available-for-sale financial assets [Line Items]      
Shares 1,000 800  
Ownership 0.04% 0.03%  
Acquisition cost ₩ 216 ₩ 152  
Book value ₩ 216 ₩ 152  
Korea Specialty Contractor Financial Cooperative [Member]      
Available-for-sale financial assets [Line Items]      
Shares 476 476  
Ownership 0.01% 0.01%  
Acquisition cost ₩ 417 ₩ 417  
Book value ₩ 417 ₩ 417  
Information & Communication Financial Cooperative [Member]      
Available-for-sale financial assets [Line Items]      
Shares 121 70  
Ownership 0.02% 0.01%  
Acquisition cost ₩ 26 ₩ 10  
Book value ₩ 26 ₩ 10  
Korea Electric Engineers Association [Member]      
Available-for-sale financial assets [Line Items]      
Shares 400 400  
Ownership 0.24% 0.24%  
Acquisition cost ₩ 40 ₩ 40  
Book value ₩ 40 ₩ 40  
Korea investment – Investment Pool for Public funds 10 [Member]      
Available-for-sale financial assets [Line Items]      
Ownership [7]   0.00%  
Acquisition cost [7]   ₩ 142,470  
Book value [7]   141,315  
Fair value [7]   ₩ 141,315  
Samsung investment – Investment Pool for Public funds 2 [Member]      
Available-for-sale financial assets [Line Items]      
Ownership [7]   0.00%  
Acquisition cost [7]   ₩ 213,710  
Book value [7]   211,920  
Fair value [7]   ₩ 211,920  
Samsung investment – Investment Pool for Public funds 1 [Member]      
Available-for-sale financial assets [Line Items]      
Ownership 0.00% [8] 0.00% [7]  
Acquisition cost ₩ 53,220 [8] ₩ 53,220 [7]  
Book value 53,739 [8] 53,212 [7]  
Fair value ₩ 53,739 [8] ₩ 53,212 [7]  
Korea investment – Hanwha KT Master Lease Private Special Investment Trust [Member]      
Available-for-sale financial assets [Line Items]      
Ownership 0.00% [8] 0.00% [7]  
Acquisition cost ₩ 26,586 [8] ₩ 30,560 [7]  
Book value 26,591 [8] 30,568 [7]  
Fair value ₩ 26,591 [8] ₩ 30,568 [7]  
Kyobo Royal-Class Repo Plus Fixed Income 1Y 2nd [Member]      
Available-for-sale financial assets [Line Items]      
Ownership [8] 0.00%    
Acquisition cost [8] ₩ 33,000    
Book value [8] 33,008    
Fair value [8] ₩ 33,008    
Kyobo Royal-Class Repo Plus Fixed Income 2Y 1st [Member]      
Available-for-sale financial assets [Line Items]      
Ownership [8] 0.00%    
Acquisition cost [8] ₩ 50,000    
Book value [8] 50,399    
Fair value [8] ₩ 50,399    
Kyobo Royal-Class Repo Plus A1 ABCP 1Y [Member]      
Available-for-sale financial assets [Line Items]      
Ownership [8] 0.00%    
Acquisition cost [8] ₩ 50,000    
Book value [8] 50,419    
Fair value [8] ₩ 50,419    
Hwan Young Steel Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 10,916 10,916  
Ownership 0.14% 0.14%  
Acquisition cost ₩ 1,092 ₩ 1,092  
Book value ₩ 97 ₩ 97  
SAMBO AUTO. Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 15,066 15,066  
Ownership 0.02% 0.02%  
Acquisition cost ₩ 38 ₩ 38  
Book value ₩ 38 ₩ 38  
Mobo Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 504 504  
Ownership 0.00% 0.00%  
Acquisition cost ₩ 14 ₩ 14  
Book value ₩ 14 ₩ 14  
HANKOOK Silicon Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares   3,005,208  
Ownership   10.44%  
Acquisition cost   ₩ 7,513  
Book value   ₩ 1,495  
Dae Kwang Semiconductor Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 589 589  
Ownership 0.07% 0.07%  
Acquisition cost ₩ 6 ₩ 6  
Book value ₩ 6 ₩ 6  
Sanbon Department Store [Member]      
Available-for-sale financial assets [Line Items]      
Shares 828 828  
Ownership 0.01% 0.01%  
Acquisition cost ₩ 124 ₩ 124  
Book value ₩ 3 ₩ 3  
Miju Steel Mfg. Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 99,804 99,804  
Ownership 0.23% 0.23%  
Acquisition cost ₩ 50 ₩ 51  
Book value ₩ 50 ₩ 51  
BnB Sungwon Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares   589  
Ownership   0.07%  
Acquisition cost   ₩ 15  
Book value   ₩ 15  
Sungwon Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 589    
Ownership 0.07%    
Acquisition cost ₩ 15    
Book value ₩ 15    
Hana Civil Engineering Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 23 23  
Ownership 0.00% 0.00%  
Acquisition cost ₩ 1 ₩ 1  
Book value ₩ 1 ₩ 1  
KC Development Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 839 839  
Ownership 0.02% 0.02%  
Acquisition cost ₩ 6 ₩ 6  
Book value ₩ 6 ₩ 6  
IMHWA Corp. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 329 329  
Ownership 0.11% 0.11%  
Acquisition cost ₩ 5 ₩ 5  
Book value ₩ 5 ₩ 5  
DALIM Special Vehicle Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 58 58  
Ownership 0.08% 0.08%  
Acquisition cost ₩ 10 ₩ 10  
Book value ₩ 10 ₩ 10  
ASA JEONJU Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 34,846 34,846  
Ownership 1.34% 1.34%  
Acquisition cost ₩ 697 ₩ 697  
Book value ₩ 69 ₩ 69  
Moonkyung Silica Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 42 42  
Ownership 0.56% 0.56%  
Sungkwang Timber Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 9 9  
Ownership 0.34% 0.34%  
Acquisition cost ₩ 4 ₩ 4  
Book value ₩ 4 ₩ 4  
Yongbo Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 61 61  
Ownership 0.20% 0.20%  
Acquisition cost ₩ 3 ₩ 3  
Book value ₩ 3 ₩ 3  
HJ Steel Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 218 218  
Ownership 0.07% 0.07%  
Acquisition cost ₩ 2 ₩ 2  
Book value ₩ 2 ₩ 2  
KS Remicon Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 12 12  
Ownership 0.04% 0.04%  
Acquisition cost ₩ 3 ₩ 3  
Book value ₩ 3 ₩ 3  
SIN-E Steel Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares   109  
Ownership   0.08%  
Acquisition cost   ₩ 33  
Book value   ₩ 33  
Joongang Platec Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 3,591 3,591  
Ownership 0.75% 0.75%  
Acquisition cost ₩ 72 ₩ 72  
Book value ₩ 35 ₩ 35  
Pyungsan SI Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 434 434  
Ownership 0.01% 0.01%  
Acquisition cost ₩ 9 ₩ 9  
Book value ₩ 9 ₩ 9  
Samgong Development Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 12 12  
Ownership 0.01% 0.01%  
Acquisition cost ₩ 7 ₩ 7  
Book value ₩ 7 ₩ 7  
Joongang Development Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 540 540  
Ownership 0.12% 0.12%  
Acquisition cost ₩ 8 ₩ 8  
Book value ₩ 8 ₩ 8  
AJS Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 12,906 12,906  
Ownership 0.23% 0.23%  
Acquisition cost ₩ 32 ₩ 32  
Book value ₩ 32 ₩ 32  
SHIN-E B&P Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 119 119  
Ownership 0.13% 0.13%  
Acquisition cost ₩ 10 ₩ 10  
Book value ₩ 10 ₩ 10  
MSE Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 429 429  
Ownership 0.13% 0.13%  
Acquisition cost ₩ 9 ₩ 9  
Book value ₩ 9 ₩ 9  
Ilrim Nano Tec Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 1,520 1,520  
Ownership 0.07% 0.07%  
Acquisition cost ₩ 15 ₩ 15  
Book value ₩ 15 ₩ 15  
Youngjin Hi-Tech Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 2,512 2,512  
Ownership 0.25% 0.25%  
Acquisition cost ₩ 126 ₩ 126  
Book value ₩ 21 ₩ 21  
Dong Woo International Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares   90  
Ownership   0.37%  
Acquisition cost   ₩ 18  
Book value   ₩ 18  
Buyoung Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 270 270  
Ownership 0.00% 0.00%  
Acquisition cost ₩ 3 ₩ 3  
Book value ₩ 3 ₩ 3  
Ilsuk Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 152 152  
Ownership 0.17% 0.17%  
Acquisition cost ₩ 10 ₩ 10  
Book value ₩ 10 ₩ 10  
Dongyang Telecom Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 1,760 1,760  
Ownership 0.01% 0.01%  
Acquisition cost ₩ 11 ₩ 11  
Book value ₩ 11 ₩ 11  
Han Young Construction Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares   35  
Ownership   0.03%  
Acquisition cost   ₩ 3  
Book value   ₩ 3  
Jongwon Remicon Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 31 31  
Ownership 0.18% 0.18%  
Acquisition cost ₩ 13 ₩ 13  
Book value ₩ 13 ₩ 13  
Ace Heat Treating Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 477 477  
Ownership 1.43% 1.43%  
Acquisition cost ₩ 72 ₩ 72  
Book value ₩ 72 ₩ 72  
Zyle Daewoo Motor Sales Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 22 22  
Ownership 0.00% 0.00%  
Daewoo Development Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 8 8  
Ownership 0.00% 0.00%  
Seyang Inc. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 537 537  
Ownership 0.05% 0.05%  
Acquisition cost ₩ 27 ₩ 27  
Book value ₩ 27 ₩ 27  
Seungri Enterprise Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 93 93  
Ownership 0.05% 0.05%  
Acquisition cost ₩ 3 ₩ 3  
Book value ₩ 3 ₩ 3  
Onggane Food Co., Ltd [Member]      
Available-for-sale financial assets [Line Items]      
Shares 5 5  
Ownership 0.07% 0.07%  
Acquisition cost ₩ 1 ₩ 1  
Book value ₩ 1 ₩ 1  
Shin-E P&C Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 12 12  
Ownership 0.00% 0.00%  
Acquisition cost ₩ 1 ₩ 1  
Book value ₩ 1 ₩ 1  
Ejung Ad Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 132 132  
Ownership 0.09% 0.09%  
Acquisition cost ₩ 3 ₩ 3  
Book value ₩ 3 ₩ 3  
Solvus Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 1,056 1,056  
Ownership 0.04% 0.04%  
Acquisition cost ₩ 3 ₩ 3  
Book value ₩ 3 ₩ 3  
Myung Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 89 89  
Ownership 0.05% 0.05%  
Acquisition cost ₩ 2 ₩ 2  
Book value ₩ 2 ₩ 2  
Emotion Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares   167  
Ownership   0.61%  
Acquisition cost   ₩ 8  
Book value   ₩ 8  
Youngdong Concrete Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares   32  
Ownership   0.32%  
Acquisition cost   ₩ 7  
Book value   ₩ 7  
Shinil Engineering Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 887 887  
Ownership 0.06% 0.06%  
Acquisition cost ₩ 3 ₩ 3  
Book value ₩ 3 ₩ 3  
Biwang Industry Co., Ltd [Member]      
Available-for-sale financial assets [Line Items]      
Shares 406 406  
Ownership 0.04% 0.04%  
Acquisition cost ₩ 2 ₩ 2  
Book value ₩ 2 ₩ 2  
Huimun Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 263 263  
Ownership 0.26% 0.26%  
Acquisition cost ₩ 4 ₩ 4  
Book value ₩ 4 ₩ 4  
Young Sung Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 89 89  
Ownership 0.40% 0.40%  
Acquisition cost ₩ 26 ₩ 27  
Book value ₩ 26 ₩ 27  
Yuil Industrial Electronics Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 804 804  
Ownership 0.32% 0.32%  
Acquisition cost ₩ 15 ₩ 16  
Book value ₩ 15 ₩ 16  
DN TEK Inc. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 12,401 12,401  
Ownership 0.29% 0.29%  
Acquisition cost ₩ 61 ₩ 62  
Book value ₩ 5 ₩ 6  
Daeyang F.M.S Corporation [Member]      
Available-for-sale financial assets [Line Items]      
Shares   593  
Ownership   0.40%  
Acquisition cost   ₩ 23  
Book value   ₩ 23  
Kwang Jin Structure Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 3,072 3,072  
Ownership 0.60% 0.60%  
Acquisition cost ₩ 31 ₩ 31  
Book value ₩ 31 ₩ 31  
Woojin Industry Corporation [Member]      
Available-for-sale financial assets [Line Items]      
Shares 3 3  
Ownership 0.00% 0.00%  
Acquisition cost ₩ 16 ₩ 16  
Book value ₩ 16 ₩ 16  
Kwang Sung Industry Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 325 325  
Ownership 0.35% 0.35%  
Acquisition cost ₩ 7 ₩ 7  
Book value ₩ 7 ₩ 7  
Futech Mold Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 274 274  
Ownership 0.27% 0.27%  
Acquisition cost ₩ 14 ₩ 14  
Book value ₩ 14 ₩ 14  
Samcheonri Industrial Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares   533  
Ownership   0.98%  
Acquisition cost   ₩ 13  
Book value   ₩ 13  
Woojoo Environment Ind. Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 101 101  
Ownership 0.11% 0.11%  
Acquisition cost ₩ 13 ₩ 13  
Book value ₩ 13 ₩ 13  
Cheongatti Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 57 57  
Ownership 0.10% 0.10%  
Acquisition cost ₩ 4 ₩ 4  
Book value ₩ 4 ₩ 4  
Hyungji Esquire Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 55 55  
Ownership 0.02% 0.02%  
Acquisition cost ₩ 22 ₩ 22  
Book value ₩ 22 ₩ 22  
Kolmar Pharma Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 1,426 1,426  
Ownership 0.01% 0.01%  
Acquisition cost ₩ 52 ₩ 52  
Book value ₩ 3 ₩ 3  
Morado Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 209 209  
Ownership 0.04% 0.04%  
Acquisition cost ₩ 2 ₩ 2  
Book value ₩ 2 ₩ 2  
Myung Sung Tex Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 20 20  
Ownership 0.00% 0.00%  
Acquisition cost ₩ 2 ₩ 2  
Book value ₩ 2 ₩ 2  
Kwang Sung Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 610 610  
Ownership 0.53% 0.53%  
Acquisition cost ₩ 31 ₩ 31  
Book value ₩ 31 ₩ 31  
EverTechno. Co.,Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 29,424 29,424  
Ownership 0.73% 0.73%  
Acquisition cost ₩ 148 ₩ 147  
Book value ₩ 7 ₩ 7  
Autowel Co.,Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 260 260  
Ownership 0.38% 0.38%  
Acquisition cost ₩ 14 ₩ 13  
Book value ₩ 14 ₩ 13  
Woobang Construction Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 8 8  
Ownership 0.00% 0.00%  
Acquisition cost ₩ 8 ₩ 8  
Book value ₩ 8 ₩ 8  
Shin Pyung Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 6 6  
Ownership 0.03% 0.03%  
Acquisition cost ₩ 3 ₩ 3  
Book value ₩ 3 ₩ 3  
JMC Heavy Industries Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 2,724 2,724  
Ownership 0.10% 0.10%  
Acquisition cost ₩ 27 ₩ 27  
Book value ₩ 27 ₩ 27  
Najin Steel Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 37 37  
Ownership 0.06% 0.06%  
Acquisition cost ₩ 5 ₩ 5  
Book value ₩ 5 ₩ 5  
Sinkwang Industry Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 1,091 1,091  
Ownership 1.68% 1.68%  
Acquisition cost ₩ 5 ₩ 5  
Book value ₩ 5 ₩ 5  
Join Land Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares   33  
Ownership   0.00%  
Acquisition cost   ₩ 1  
Book value   ₩ 1  
Crystal Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 22 22  
Ownership 0.07% 0.07%  
Acquisition cost ₩ 2 ₩ 2  
Book value ₩ 2 ₩ 2  
Elephant & Friends Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 563 563  
Ownership 0.61% 0.61%  
Acquisition cost ₩ 3 ₩ 3  
Book value ₩ 3 ₩ 3  
Mireco Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 109 109  
Ownership 0.25% 0.25%  
Acquisition cost ₩ 11 ₩ 11  
Book value ₩ 11 ₩ 11  
L&K Industry Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 1,615 1,615  
Ownership 0.60% 0.60%  
Acquisition cost ₩ 24 ₩ 24  
Book value ₩ 24 ₩ 24  
JO Tech Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 1,263 1,263  
Ownership 0.62% 0.62%  
Acquisition cost ₩ 25 ₩ 25  
Book value ₩ 25 ₩ 25  
Kendae Printing Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 422 422  
Ownership 0.60% 0.60%  
Acquisition cost ₩ 21 ₩ 21  
Book value ₩ 21 ₩ 21  
Dauning Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 231 231  
Ownership 0.41% 0.41%  
Acquisition cost ₩ 6 ₩ 6  
Book value ₩ 6 ₩ 6  
Korea Trecision Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 22 22  
Ownership 0.45% 0.45%  
Acquisition cost ₩ 5 ₩ 5  
Book value ₩ 5 ₩ 5  
Ace Track Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 3,130 3,130  
Ownership 1.08% 1.08%  
Acquisition cost ₩ 219 ₩ 219  
Book value ₩ 59 ₩ 59  
Taebok Machinery Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 109 109  
Ownership 1.08% 1.08%  
Acquisition cost ₩ 11 ₩ 11  
Book value ₩ 11 ₩ 11  
Yooah Industry Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares   130  
Ownership   0.02%  
Acquisition cost   ₩ 13  
Book value   ₩ 13  
Yoo-A Construction Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 105 105  
Ownership 0.20% 0.20%  
Acquisition cost ₩ 11 ₩ 11  
Book value ₩ 11 ₩ 11  
Dung Hwan Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 531 531  
Ownership 0.02% 0.02%  
Acquisition cost ₩ 5 ₩ 5  
Book value ₩ 5 ₩ 5  
Hurim Biocell Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 113 113  
Ownership 0.00% 0.00%  
Acquisition cost ₩ 5 ₩ 5  
Book value ₩ 5 ₩ 5  
P. J, Trading Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares   12  
Ownership   0.04%  
Sunjin Power Tech Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 4,941 4,941  
Ownership 0.92% 0.92%  
Acquisition cost ₩ 247 ₩ 247  
Book value ₩ 32 ₩ 90  
Smart Power Co.,Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 133,333 133,333  
Ownership 4.83% 5.55%  
Acquisition cost ₩ 200 ₩ 200  
Book value ₩ 200 ₩ 200  
Haseung Industries Co.,Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 55 55  
Ownership 0.62% 0.62%  
Acquisition cost ₩ 28 ₩ 28  
Book value ₩ 28 ₩ 28  
Beer Yeast Korea Inc. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 1,388 1,388  
Ownership 0.43% 0.43%  
Acquisition cost ₩ 7 ₩ 7  
Book value ₩ 7 ₩ 7  
Daeryung Corporation [Member]      
Available-for-sale financial assets [Line Items]      
Shares 207 207  
Ownership 0.19% 0.19%  
Acquisition cost ₩ 10 ₩ 10  
Book value ₩ 10 ₩ 10  
Korea Bio Red Ginseng Co.,Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 194 194  
Ownership 0.09% 0.09%  
Acquisition cost ₩ 10 ₩ 10  
Book value ₩ 10 ₩ 10  
ENH Co.,Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 1,086 1,086  
Ownership 0.19% 0.19%  
Acquisition cost ₩ 54 ₩ 54  
Book value ₩ 54 ₩ 54  
OCO Co.,Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares   123  
Ownership   0.37%  
Acquisition cost   ₩ 11  
Book value   ₩ 11  
B CON Co.,Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 96 96  
Ownership 1.16% 1.16%  
Acquisition cost ₩ 6 ₩ 6  
Book value ₩ 6 ₩ 6  
Chunil Metal Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 11 11  
Ownership 0.15% 0.15%  
Acquisition cost ₩ 4 ₩ 4  
Book value ₩ 4 ₩ 4  
Teakwang Tech Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares   2,460  
Ownership   0.11%  
Acquisition cost   ₩ 12  
Book value   ₩ 12  
SsangMa Machine Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 4 4  
Ownership 0.05% 0.05%  
Acquisition cost ₩ 1 ₩ 1  
Book value ₩ 1 ₩ 1  
SinJin Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 233 233  
Ownership 0.30% 0.30%  
Acquisition cost ₩ 9 ₩ 9  
Book value ₩ 9 ₩ 9  
Ace Integration Co., Ltd [Member]      
Available-for-sale financial assets [Line Items]      
Shares 105 93  
Ownership 0.09% 0.09%  
Acquisition cost ₩ 24 ₩ 21  
Book value ₩ 24 ₩ 21  
AceInti Agricultural Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 16 3  
Ownership 0.02% 0.00%  
Acquisition cost ₩ 5 ₩ 1  
Book value ₩ 5 ₩ 1  
KyungDong Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 130 130  
Ownership 0.01% 0.01%  
Acquisition cost ₩ 1 ₩ 1  
Book value ₩ 1 ₩ 1  
ChunWon Development Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 193 193  
Ownership 0.19% 0.19%  
Acquisition cost ₩ 39 ₩ 39  
Book value ₩ 39 ₩ 39  
WonIl Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 999 999  
Ownership 0.15% 0.15%  
Acquisition cost ₩ 50 ₩ 50  
Book value ₩ 50 ₩ 50  
SungLim Industrial Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 29 29  
Ownership 0.03% 0.03%  
Acquisition cost ₩ 1 ₩ 1  
Book value ₩ 1 ₩ 1  
DaeHa Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares   141  
Ownership   0.54%  
Acquisition cost   ₩ 11  
Book value   ₩ 11  
Korea Minerals Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 191 191  
Ownership 0.05% 0.05%  
Acquisition cost ₩ 134 ₩ 135  
Book value ₩ 1 ₩ 135  
HyoDong Development Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 119 119  
Ownership 0.15% 0.15%  
Acquisition cost ₩ 24 ₩ 24  
Book value ₩ 24 ₩ 24  
Haspe Tech Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 652 652  
Ownership 0.55% 0.55%  
Acquisition cost ₩ 20 ₩ 20  
Book value ₩ 20 ₩ 20  
JoHyun Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 350 350  
Ownership 1.56% 1.56%  
Acquisition cost ₩ 18 ₩ 18  
Book value ₩ 18 ₩ 18  
KC Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 5,107 5,107  
Ownership 0.17% 0.17%  
Acquisition cost ₩ 3 ₩ 3  
Book value ₩ 3 ₩ 3  
SeongJi Industrial Co.,Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 41 41  
Ownership 0.05% 0.05%  
Acquisition cost ₩ 1 ₩ 1  
Book value ₩ 1 ₩ 1  
Areva nc Expansion [Member]      
Available-for-sale financial assets [Line Items]      
Shares   1,077,124  
Ownership   13.49%  
Acquisition cost   ₩ 288,443  
Book value   98,472  
Fair value   ₩ 98,472  
Navanakorn Electric Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 4,442,800 [9] 8,885,600 [10]  
Ownership 26.93% [9] 26.93% [10]  
Acquisition cost ₩ 17,216 [9] ₩ 17,216 [10]  
Book value ₩ 16,410 [9] ₩ 18,509 [10]  
PT. Kedap Saayq [Member]      
Available-for-sale financial assets [Line Items]      
Shares 671 671  
Ownership 10.00% 10.00%  
Acquisition cost ₩ 18,540 ₩ 18,540  
Set Holding [Member]      
Available-for-sale financial assets [Line Items]      
Shares 1,100,220 [11] 1,100,220 [12]  
Ownership 2.50% [11] 2.50% [12]  
Acquisition cost ₩ 229,255 [11] ₩ 229,255 [12]  
Book value 170,242 [11] 170,170 [12]  
Fair value ₩ 170,242 [11] ₩ 170,170 [12]  
PT. Cirebon Energi Prasarana [Member]      
Available-for-sale financial assets [Line Items]      
Shares 22,420 22,420  
Ownership 10.00% 10.00%  
Acquisition cost ₩ 2,612 ₩ 2,612  
Book value ₩ 2,401 ₩ 2,709  
DongKwang SD, Inc. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 524    
Ownership 0.23%    
Acquisition cost ₩ 13    
Book value ₩ 13    
Dong Yang Metal Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 2,951    
Ownership 1.97%    
Acquisition cost ₩ 15    
Book value ₩ 15    
Seyang Precision Ind.Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 829    
Ownership 0.23%    
Acquisition cost ₩ 41    
Book value ₩ 41    
Dooriwon Food System Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 13    
Ownership 0.27%    
Acquisition cost ₩ 1    
Book value ₩ 1    
ShinShin Co., Ltd [Member]      
Available-for-sale financial assets [Line Items]      
Shares 339    
Ownership 1.12%    
Acquisition cost ₩ 17    
Book value ₩ 17    
Kitorang Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 165    
Ownership 0.24%    
Acquisition cost ₩ 49    
Book value ₩ 49    
Sung Kwang Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 23    
Ownership 0.37%    
Acquisition cost ₩ 6    
Book value ₩ 6    
Hyundai Metal Co., Ltd. [Member]      
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. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 699    
Ownership 0.14%    
Acquisition cost ₩ 7    
Book value ₩ 7    
Force TEC Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 3,501    
Ownership 0.02%    
Acquisition cost ₩ 18    
Book value ₩ 18    
Haisung Industrial Systems Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 10,751    
Ownership 0.24%    
Acquisition cost ₩ 54    
Book value ₩ 54    
Samsung Tech Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 486    
Ownership 1.28%    
Acquisition cost ₩ 97    
Book value ₩ 97    
Tae Hyung Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 28    
Ownership 0.43%    
Acquisition cost ₩ 20    
Book value ₩ 20    
Samyangplant Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 323    
Ownership 0.60%    
Acquisition cost ₩ 16    
Book value ₩ 16    
Younil Metal Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 41    
Ownership 0.21%    
Acquisition cost ₩ 21    
Book value ₩ 21    
Myungjin Tech Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 20    
Ownership 0.54%    
Acquisition cost ₩ 4    
Book value ₩ 4    
Hankook Machine Tools Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 719    
Ownership 0.14%    
Acquisition cost ₩ 72    
Book value ₩ 72    
Hankook Precision Ind Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 110    
Ownership 0.06%    
Acquisition cost ₩ 11    
Book value ₩ 11    
Borneo International Furniture Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 64,037    
Ownership 0.28%    
Acquisition cost ₩ 97    
Book value ₩ 14    
CJ Paradise Co.,Ltd [Member]      
Available-for-sale financial assets [Line Items]      
Shares 24    
Ownership 0.02%    
Acquisition cost ₩ 12    
Book value ₩ 12    
Han Young Technology Company Co.,Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 35    
Ownership 0.00%    
Jungdo Aluminium Co.,Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 8,527    
Ownership 0.35%    
Acquisition cost ₩ 128    
Book value ₩ 128    
Ilheung Metal Co, Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 280    
Ownership 0.83%    
Acquisition cost ₩ 28    
Book value ₩ 28    
STX Offshore & Shipbuilding Co., Ltd [Member]      
Available-for-sale financial assets [Line Items]      
Shares 8,622    
Ownership 0.25%    
Acquisition cost ₩ 1,078    
Book value ₩ 1,078    
Ptotronics Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 151    
Ownership 0.07%    
Acquisition cost ₩ 2    
Book value ₩ 2    
NFT Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 136    
Ownership 0.40%    
Acquisition cost ₩ 8    
Book value ₩ 8    
Echoroba Co.,Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 157    
Ownership 0.02%    
Acquisition cost ₩ 3    
Book value ₩ 3    
Hyundaitech Co.,Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 1,363    
Ownership 0.87%    
Acquisition cost ₩ 27    
Book value ₩ 27    
Eco Alux Co.,Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 239    
Ownership 0.22%    
Acquisition cost ₩ 48    
Book value ₩ 48    
Daekyung Industry Co.,Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 9,112    
Ownership 0.94%    
Acquisition cost ₩ 13    
Book value ₩ 13    
Dasan Material Co.Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 29    
Ownership 0.04%    
Fish World Co.,Ltd. [Member]      
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. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 10    
Ownership 0.00%    
Acquisition cost ₩ 6    
Book value ₩ 6    
Samdo Industry Electric Co.,Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 48    
Ownership 0.02%    
Acquisition cost ₩ 1    
Book value ₩ 1    
Taejung Industries Co.,Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 9,268    
Ownership 0.30%    
Acquisition cost ₩ 5    
Book value ₩ 5    
Shinsei Trading Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 64    
Ownership 0.72%    
Acquisition cost ₩ 1    
Book value ₩ 1    
Dynamic Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 111    
Ownership 0.19%    
Acquisition cost ₩ 3    
Book value ₩ 3    
Green Alchemy Co.,Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 38,202    
Ownership 1.48%    
Acquisition cost ₩ 191    
Book value ₩ 191    
IQ Power Asia Inc. [Member]      
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. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 227,854    
Ownership 0.27%    
Acquisition cost ₩ 31    
Book value ₩ 31    
KM Leatech [Member]      
Available-for-sale financial assets [Line Items]      
Shares 1,648    
Ownership 0.98%    
Acquisition cost ₩ 8    
Book value ₩ 8    
Wonil T&I Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 229    
Ownership 0.17%    
Acquisition cost ₩ 23    
Book value ₩ 23    
Semist Co.,Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares 555    
Ownership 0.80%    
Acquisition cost ₩ 3    
Book value ₩ 3    
DS POWER Co., Ltd. [Member]      
Available-for-sale financial assets [Line Items]      
Shares [13] 580,000    
Ownership [13] 2.34%    
Acquisition cost [13] ₩ 2,900    
Book value [13] 1,223    
Fair value [13] ₩ 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] The number of shares owned has changed due to the stock merge (500:1) during the year ended December 31, 2016
[4] 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.
[5] 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.
[6] 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, 2016.
[7] As of December 31, 2016, the Company invested in ￦437,015 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.
[8] As of December 31, 2017, the Company invested in ￦285,769 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.
[9] Although the Company holds more than 20% of the equity shares of these investments, the Company cannot exercise significant influence.
[10] Although the Company holds more than 20% of the equity shares of these investments, the Company cannot exercise significant influence.
[11] 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.
[12] 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, 2016.
[13] As described in note 17, this is reclassified to available-for-sale financial assets due to loss of significant influence of the Company.