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Changes in Accounting Policies - Summary of Impact on Financial Statements Due to Application of IFRS 15 at the Date of Initial Application (Detail) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Jan. 01, 2018
Jan. 01, 2017
Jan. 01, 2016
Dec. 31, 2015
Disclosure of expected impact of initial application of new standards or interpretations [line items]              
Current assets ₩ 12,157,814 ₩ 9,828,525   ₩ 11,117,433 ₩ 9,866,302    
Trade and other receivables 5,680,349 5,964,565   5,969,040 5,477,634    
Inventories 1,074,634 642,027   642,027 454,588    
Other current assets 1,687,548 304,860   1,589,293 311,135    
Others 3,715,283     2,917,073      
Non-current assets 20,316,306 20,067,196   20,135,256 20,948,278    
Trade and other receivables 842,995 828,832   826,547 709,011    
Deferred income tax assets 465,369 712,222   359,949 701,409    
Other non-current assets 545,895 107,165   529,783 106,099    
Others 18,462,047     18,418,977      
Total assets 32,474,120 29,895,721   31,252,689 30,814,580    
Current liabilities 9,394,123 9,474,162   9,744,055 9,539,195    
Trade and other payables 7,007,515 7,426,088   7,426,385 7,141,725    
Deferred revenue 52,878 17,906   51,561 35,617    
Provisions 117,881 78,172   78,349 96,485    
Other current liabilities 596,589 258,314   494,079 342,291    
Others 8,626,775     1,693,681      
Non-current liabilities 8,421,507 7,238,205   7,318,441 8,358,443    
Deferred revenue 110,702 91,698   115,529 85,372    
Deferred income tax liabilities 204,785 128,462   135,367 137,680    
Other non-current liabilities 423,626 237,284   286,783 58,761    
Others 7,682,394     6,780,762      
Total liabilities 17,815,630 16,712,367   17,062,496 17,897,638    
Equity attribute to owners of the Controlling Company 13,129,901 11,791,590 ₩ 11,564,098 12,721,456 11,564,098 ₩ 10,933,231  
Non-controllinginterest 1,528,589 1,391,764   1,468,737 1,352,844    
Total equity 14,658,490 13,183,354 12,916,942 14,190,193 12,916,942   ₩ 12,253,627
Operating revenue 23,436,050 23,546,929 23,164,202        
Operating expenses 22,335,190 22,477,837 21,781,098        
Operating profit 1,100,860 1,069,092 1,383,104        
Financial income 374,243 406,328 296,139        
Financial costs 435,659 644,531 515,087        
Share of net losses of associates and joint venture (5,467) (13,892) 2,599        
Profit before income tax 1,033,977 816,997 1,166,755        
Income tax expense 314,565 270,656 334,910        
Profit for the year 719,412 546,341 831,845        
As previously reported [member]              
Disclosure of expected impact of initial application of new standards or interpretations [line items]              
Current assets 10,822,686 9,678,243   9,828,525 9,716,020    
Trade and other receivables 5,687,490 5,814,283   5,964,565 5,327,352    
Inventories 1,127,669     642,027      
Other current assets 292,244     304,860      
Others 3,715,283     2,917,073      
Non-current assets 20,228,874     20,067,196      
Trade and other receivables 847,612     828,832      
Deferred income tax assets 822,297     712,222      
Other non-current assets 96,918     107,165      
Others 18,462,047     18,418,977      
Total assets 31,051,560 29,745,439   29,895,721 30,664,298    
Current liabilities 9,075,863 9,458,104   9,474,162 9,523,137    
Trade and other payables   7,424,134   7,426,088 7,139,771    
Deferred revenue 14,821     17,906      
Provisions 117,316     78,172      
Other current liabilities 316,951     258,315      
Others 8,626,775     1,693,681      
Non-current liabilities 8,366,999     7,238,205      
Deferred revenue 83,469     91,698      
Deferred income tax liabilities 183,766     128,462      
Other non-current liabilities 417,370     237,283      
Others 7,682,394     6,780,762      
Total liabilities 17,442,862 16,696,309   16,712,367 17,881,580    
Equity attribute to owners of the Controlling Company 12,159,471 11,657,366 11,429,874 11,791,590 11,429,874 ₩ 10,835,735  
Non-controllinginterest 1,449,227     1,391,764      
Total equity 13,608,698 13,049,130   13,183,354 ₩ 12,782,718   12,156,131
Operating revenue 23,704,320   23,120,878        
Operating expenses 22,651,685            
Operating profit 1,052,635   1,339,780        
Financial income 370,381            
Financial costs 452,519            
Share of net losses of associates and joint venture (5,467)            
Profit before income tax 965,030   1,123,431        
Income tax expense 296,621   328,314        
Profit for the year 668,409   ₩ 795,117        
Increase (decrease) due to application of IFRS 15 [member]              
Disclosure of expected impact of initial application of new standards or interpretations [line items]              
Current assets (1,335,128)     1,288,908      
Trade and other receivables 7,141     4,475      
Inventories 53,035            
Other current assets (1,395,304)     1,284,433      
Non-current assets (87,432)     68,060      
Trade and other receivables 4,617     (2,285)      
Deferred income tax assets 356,928     (352,273)      
Other non-current assets (448,977)     422,618      
Total assets (1,422,560)     1,356,968      
Current liabilities (318,260)     269,893      
Trade and other payables       297      
Deferred revenue (38,057)     33,655      
Provisions (565)     177      
Other current liabilities (279,638)     235,764      
Non-current liabilities (54,508)     80,236      
Deferred revenue (27,233)     23,831      
Deferred income tax liabilities (21,019)     6,905      
Other non-current liabilities (6,256)     49,500      
Total liabilities (372,768)     350,129      
Equity attribute to owners of the Controlling Company (970,430)     929,866      
Non-controllinginterest (79,362)     76,973      
Total equity (1,049,792)     ₩ 1,006,839      
Operating revenue 268,270            
Operating expenses 316,495            
Operating profit (48,225)            
Financial income (3,862)            
Financial costs 16,860            
Profit before income tax (68,947)            
Income tax expense (17,944)            
Profit for the year (51,003)            
Adjusted [member]              
Disclosure of expected impact of initial application of new standards or interpretations [line items]              
Total equity   ₩ 14,232,276         ₩ 97,496
Operating revenue 23,436,050            
Operating expenses 22,335,190            
Operating profit 1,100,860            
Financial income 374,243            
Financial costs 435,659            
Share of net losses of associates and joint venture (5,467)            
Profit before income tax 1,033,977            
Income tax expense 314,565            
Profit for the year ₩ 719,412