XML 240 R228.htm IDEA: XBRL DOCUMENT v3.21.1
Changes in Accounting Policies - Determination of Lease Term Considering Economic Penalty - Summary of Impact on Consolidated Financial Statements Due to Application of accounting policy (Detail) - KRW (₩)
₩ / shares in Units, ₩ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Current assets        
Prepaid expenses ₩ 66,578 ₩ 84,768    
Non-current assets        
Right-of-use assets 1,217,179 1,268,329    
Current liabilities        
Lease liabilities   392,433    
Non-current liabilities        
Lease liabilities   818,919    
Total liabilities 18,111,112 19,491,530    
Retained earnings 12,155,420 11,590,916    
Total equity 15,551,433 15,140,684 ₩ 14,658,490 ₩ 13,183,354
Operating revenue 24,440,647 24,899,189 23,436,050  
Operating expenses 23,418,314 23,872,219 22,335,190  
Finance income 498,614 424,395 374,243  
Financial costs 507,383 432,133 435,659  
Income tax expense 285,349 320,060 314,565  
Profit for the year ₩ 746,256 ₩ 695,868 ₩ 719,412  
Basic earnings per share ₩ 2,858 ₩ 2,634 ₩ 2,634  
Diluted earnings per share ₩ 2,858 ₩ 2,632 ₩ 2,634  
Adjustment on Accounting policy        
Current assets        
Prepaid expenses ₩ (2,119) ₩ (1,026)    
Non-current assets        
Right-of-use assets 632,145 479,832    
Current liabilities        
Lease liabilities 63,263 36,600    
Non-current liabilities        
Lease liabilities 566,532 445,612    
Total liabilities 629,795 482,212    
Retained earnings 232 (3,406)    
Total equity 232 (3,406)    
Operating revenue 5,796      
Operating expenses (7,063) (6,796)    
Financial costs 9,222 10,202    
Profit for the year ₩ 3,637 ₩ (3,406)    
Basic earnings per share ₩ 15 ₩ (14)    
Diluted earnings per share ₩ 18 ₩ (14)    
Previously stated [member]        
Current assets        
Prepaid expenses ₩ 61,930 ₩ 76,036    
Non-current assets        
Right-of-use assets 585,034 788,497    
Current liabilities        
Lease liabilities 281,961 355,833    
Non-current liabilities        
Lease liabilities 798,416 373,307    
Total liabilities 513,845 729,140    
Retained earnings 12,155,188 11,594,322    
Total equity 12,155,188 11,594,322    
Operating revenue 24,434,851 24,899,189    
Operating expenses 23,425,377 23,879,015    
Finance income 498,614 424,395    
Financial costs 498,161 421,931    
Income tax expense 285,349 320,060    
Profit for the year ₩ 742,619 ₩ 699,274    
Basic earnings per share ₩ 2,843 ₩ 2,648    
Diluted earnings per share ₩ 2,840 ₩ 2,646    
Adjustment on Accounting policy        
Current assets        
Prepaid expenses ₩ 59,811 ₩ 75,010    
Non-current assets        
Right-of-use assets 1,217,179 1,268,329    
Current liabilities        
Lease liabilities 345,224 392,433    
Non-current liabilities        
Lease liabilities 798,416 818,919    
Total liabilities 1,143,640 1,211,352    
Retained earnings 12,155,420 11,590,916    
Total equity 12,155,420 11,590,916    
Operating revenue 24,440,647 24,899,189    
Operating expenses 23,418,314 23,872,219    
Finance income 498,614 424,395    
Financial costs 507,383 432,133    
Income tax expense 285,349 320,060    
Profit for the year ₩ 746,256 ₩ 695,868    
Basic earnings per share ₩ 2,858 ₩ 2,634    
Diluted earnings per share ₩ 2,858 ₩ 2,632