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Classification of Financial Instruments - Classification of financial assets (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of Classification by categories of financial assets [Line Items]        
Cash and cash equivalents ₩ 1,358,345 ₩ 2,369,739 ₩ 3,051,353 ₩ 3,783,065
Categories of current financial assets        
Held-to-maturity investments   5    
Current financial assets at fair value through profit or loss [1] 313,893      
Current financial assets at amortised cost 11,956      
Current Derivative assets 42,107 12,935 193,283  
Other financial assets 1,991,939 1,945,417    
Trade and other receivables 7,793,592 7,928,972    
Total current financial assets And Cash and cash equivalents 11,511,832 12,257,068    
Non-Financial Assets        
Available-for-sale financial assets   699,833    
Held-to-maturity investments   3,139    
Non-current financial assets at fair value through profit or loss [1] 607,042      
Non-current financial assets at fair value through other comprehensive income 399,495      
Non-current financial assets at amortised cost 2,086      
Non-current Derivative assets 60,228 19,691 ₩ 588,091  
Other financial assets 1,044,762 1,316,250    
Trade and other receivables 1,819,845 1,754,797    
Total non-current financial assets 3,933,458 3,793,710    
Total financial assets 15,445,290 16,050,778    
Financial assets at fair value through profit or loss        
Disclosure of Classification by categories of financial assets [Line Items]        
Cash and cash equivalents 0 0    
Categories of current financial assets        
Held-to-maturity investments   0    
Current financial assets at fair value through profit or loss 313,893      
Current financial assets at amortised cost 0      
Current Derivative assets 13,936 12,923    
Other financial assets [2] 0 0    
Trade and other receivables 0 0    
Total current financial assets And Cash and cash equivalents 327,829 12,923    
Non-Financial Assets        
Available-for-sale financial assets   0    
Held-to-maturity investments   0    
Non-current financial assets at fair value through profit or loss 607,042      
Non-current financial assets at fair value through other comprehensive income 0      
Non-current financial assets at amortised cost 0      
Non-current Derivative assets 23,695 9,097    
Other financial assets [2] 0 111,512    
Trade and other receivables 0 0    
Total non-current financial assets 630,737 120,609    
Total financial assets 958,566 133,532    
Financial assets at fair value through other comprehensive income        
Disclosure of Classification by categories of financial assets [Line Items]        
Cash and cash equivalents 0      
Categories of current financial assets        
Current financial assets at fair value through profit or loss 0      
Current financial assets at amortised cost 0      
Current Derivative assets 0      
Other financial assets 0      
Trade and other receivables 0      
Total current financial assets And Cash and cash equivalents 0      
Non-Financial Assets        
Non-current financial assets at fair value through profit or loss 0      
Non-current financial assets at fair value through other comprehensive income 399,495      
Non-current financial assets at amortised cost 0      
Non-current Derivative assets 0      
Other financial assets 0      
Trade and other receivables 0      
Total non-current financial assets 399,495      
Total financial assets 399,495      
Financial assets at amortized cost        
Disclosure of Classification by categories of financial assets [Line Items]        
Cash and cash equivalents 1,358,345      
Categories of current financial assets        
Current financial assets at amortised cost 11,956      
Current Derivative assets 0      
Other financial assets 1,991,939      
Trade and other receivables 7,793,592      
Total current financial assets And Cash and cash equivalents 11,155,832      
Non-Financial Assets        
Non-current financial assets at fair value through profit or loss 0      
Non-current financial assets at fair value through other comprehensive income 0      
Non-current financial assets at amortised cost 2,086      
Non-current Derivative assets 0      
Other financial assets 1,044,762      
Trade and other receivables 1,819,845      
Total non-current financial assets 2,866,693      
Total financial assets 14,022,525      
Loans and receivables        
Disclosure of Classification by categories of financial assets [Line Items]        
Cash and cash equivalents   2,369,739    
Categories of current financial assets        
Held-to-maturity investments   0    
Current Derivative assets   0    
Other financial assets   1,945,417    
Trade and other receivables   7,928,972    
Total current financial assets And Cash and cash equivalents   12,244,128    
Non-Financial Assets        
Available-for-sale financial assets   0    
Held-to-maturity investments   0    
Non-current Derivative assets   0    
Other financial assets   1,204,738    
Trade and other receivables   1,754,797    
Total non-current financial assets   2,959,535    
Total financial assets   15,203,663    
Financial assets available-for-sale        
Disclosure of Classification by categories of financial assets [Line Items]        
Cash and cash equivalents   0    
Categories of current financial assets        
Held-to-maturity investments   0    
Current Derivative assets   0    
Other financial assets   0    
Trade and other receivables   0    
Total current financial assets And Cash and cash equivalents   0    
Non-Financial Assets        
Available-for-sale financial assets   699,833    
Held-to-maturity investments   0    
Non-current Derivative assets   0    
Other financial assets   0    
Trade and other receivables   0    
Total non-current financial assets   699,833    
Total financial assets   699,833    
Held-to-maturity investments        
Disclosure of Classification by categories of financial assets [Line Items]        
Cash and cash equivalents   0    
Categories of current financial assets        
Held-to-maturity investments   5    
Current Derivative assets   0    
Other financial assets   0    
Trade and other receivables   0    
Total current financial assets And Cash and cash equivalents   5    
Non-Financial Assets        
Available-for-sale financial assets   0    
Held-to-maturity investments   3,139    
Non-current Derivative assets   0    
Other financial assets   0    
Trade and other receivables   0    
Total non-current financial assets   3,139    
Total financial assets   3,144    
Derivative assets (applying hedge accounting)        
Disclosure of Classification by categories of financial assets [Line Items]        
Cash and cash equivalents 0 0    
Categories of current financial assets        
Held-to-maturity investments   0    
Current financial assets at fair value through profit or loss 0      
Current financial assets at amortised cost 0      
Current Derivative assets 28,171 12    
Other financial assets 0 0    
Trade and other receivables 0 0    
Total current financial assets And Cash and cash equivalents 28,171 12    
Non-Financial Assets        
Available-for-sale financial assets   0    
Held-to-maturity investments   0    
Non-current financial assets at fair value through profit or loss 0      
Non-current financial assets at fair value through other comprehensive income 0      
Non-current financial assets at amortised cost 0      
Non-current Derivative assets 36,533 10,594    
Other financial assets 0 0    
Trade and other receivables 0 0    
Total non-current financial assets 36,533 10,594    
Total financial assets ₩ 64,704 ₩ 10,606    
[1] As of December 31, 2018, the Company invested KRW528,006 million exclusively for payment of decommissioning costs of nuclear power plants.
[2] Certain financial assets at fair value previously recognized as other financial assets is reclassified to financial assets at fair value through profit or loss upon the adoption of IFRS 9 'Financial Instruments'.