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Explanation of initial application of IFRS 16 (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of Explanation of initial application of IFRS 16 [Line Items]        
Current non-financial assets (Note 15) ₩ 1,206,377 ₩ 875,867 ₩ 878,888  
Total current assets 19,483,001 19,742,047 19,745,068  
Non-current trade and other receivables, net (Notes 5,8,20,45,46 and 47) 2,002,297 1,819,835 1,819,845  
Property, plant and equipment, net (Notes 18,24,27 and 49) 164,701,827 157,691,141 152,743,194  
Non-current non-financial assets (Note 15) 166,929 325,820 327,152  
Total non-current assets 178,114,791 170,450,598 165,503,993  
Total Assets (Note 4) 197,597,792 190,192,645 185,249,061 ₩ 181,788,915
Trade and other payables, net (Notes 5,22,24,45 and 47) 6,649,402 6,915,699 6,405,395  
Total current liabilities 24,231,656 22,351,837 21,841,533  
Non-current trade and other payables, net (Notes 5,22,24,45 and 47) 6,965,760 7,374,976 2,941,696  
Total non-current liabilities 104,476,487 96,748,046 92,314,766  
Total liabilities (Note 4) 128,708,143 119,099,883 114,156,299 ₩ 108,824,274
Total liabilities and equity ₩ 197,597,792 190,192,645 ₩ 185,249,061  
Increase (decrease) due to changes in accounting policy required by IFRSs        
Disclosure of Explanation of initial application of IFRS 16 [Line Items]        
Current non-financial assets (Note 15)   (3,021)    
Total current assets   (3,021)    
Non-current trade and other receivables, net (Notes 5,8,20,45,46 and 47)   (10)    
Property, plant and equipment, net (Notes 18,24,27 and 49)   4,947,947    
Non-current non-financial assets (Note 15)   (1,332)    
Total non-current assets   4,946,605    
Total Assets (Note 4)   4,943,584    
Trade and other payables, net (Notes 5,22,24,45 and 47)   510,304    
Total current liabilities   510,304    
Non-current trade and other payables, net (Notes 5,22,24,45 and 47)   4,433,280    
Total non-current liabilities   4,433,280    
Total liabilities (Note 4) [1]   4,943,584    
Total liabilities and equity   ₩ 4,943,584    
[1] The adjustment from the total liabilities amounting to KRW 4,943,584 is a present value of operating lease payment as of December 31, 2018, discounted by the weighted average interest rate of the lessee's incremental borrowing rates as of January 1, 2019, and deducted by the present value of short-term leases and low-value asset leases payments