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Deferred Income Tax and Income Tax Expense - Summary of Movement in Deferred Income Tax Assets and Liabilities (Detail) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Beginning ₩ 583,760 ₩ 563,729  
Changes in accounting policy (374,307)    
Statement of operations 15,016 (1,771) ₩ (152,102)
Other comprehensive income 36,115 21,802  
Ending 260,584 583,760 563,729
Deferred tax derivative liabilities [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Beginning (30,520) (49,188)  
Changes in accounting policy 30,520    
Statement of operations   49,188  
Ending   (30,520) (49,188)
Deferred tax liabilities available for sale financial assets [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Beginning (30,520) (31,702)  
Statement of operations   (164)  
Other comprehensive income   1,346  
Ending   (30,520) (31,702)
Deferred tax liabilities investment in subsidiaries associates and joint ventures [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Beginning (96,650) (50,746)  
Statement of operations 2,867 (42,659)  
Other comprehensive income 179 (3,245)  
Ending (93,604) (96,650) (50,746)
Deferred tax liabilities depreciation [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Beginning   (39,498)  
Statement of operations (424) 39,498  
Ending (424)   (39,498)
Deferred tax liabilities advanced depreciation provision [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Beginning (248,592) (225,687)  
Statement of operations (64,592) (22,905)  
Ending (313,184) (248,592) (225,687)
Deferred tax liabilities deposits for severance benefits [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Beginning (387,856) (307,730)  
Statement of operations (11,126) (80,126)  
Ending (398,982) (387,856) (307,730)
Deferred tax liabilities accrued income [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Beginning (2,150) (2,024)  
Statement of operations 592 (126)  
Ending (1,558) (2,150) (2,024)
Deferred tax liabilities reserve for technology and human resource development [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Beginning (314) (747)  
Statement of operations 110 433  
Ending (204) (314) (747)
Other deferred tax liabilities [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Beginning (108,749) (119,366)  
Statement of operations (175,506) 10,617  
Ending (284,255) (108,749) (119,366)
Deferred tax liabilities prepaid expenses [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Changes in accounting policy (352,139)    
Statement of operations (17,777)    
Ending (369,916)    
Deferred tax derivative assets [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Beginning 24,724    
Statement of operations (26,128) 34,572  
Other comprehensive income 9,745 (9,848)  
Ending 8,341 24,724  
Deferred tax assets provision for impairment or trade receivables [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Beginning 121,656 110,276  
Changes in accounting policy (9,096)    
Statement of operations (12,673) 11,380  
Ending 99,887 121,656 110,276
Deferred tax assets inventory valuation [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Beginning   48  
Statement of operations 121 (48)  
Ending 121   48
Deferred tax assets contribution for construction [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Beginning 18,271 18,091  
Statement of operations (1,471) 180  
Ending 16,800 18,271 18,091
Deferred tax assets accrued expenses [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Beginning 91,039 80,356  
Statement of operations   10,683  
Ending   91,039 80,356
Deferred Tax Assets Provisions [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Beginning 24,079 20,221  
Statement of operations 12,099 3,858  
Ending 36,178 24,079 20,221
Deferred tax assets property, plant and equipment [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Beginning 232,074    
Statement of operations (1,796)    
Ending 230,278 232,074  
Deferred Tax assets assets retirement obligation [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Beginning 20,836 18,086  
Statement of operations 3,696 2,750  
Ending 24,532 20,836 18,086
Deferred tax assets withholding of facilities expenses [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Beginning 7,382 6,910  
Statement of operations (773) 472  
Ending 6,609 7,382 6,910
Deferred tax assets accrued payroll expenses [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Beginning 15,129 25,915  
Statement of operations   (10,786)  
Ending   15,129 25,915
Deferred tax assets deduction of installment receivables [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Beginning   13,887  
Statement of operations 42 (13,887)  
Ending 42   13,887
Deferred tax assets property and equipment [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Beginning 232,074 232,915  
Statement of operations   (841)  
Ending   232,074 232,915
Deferred tax assets gain or loss foreign currency translation [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Beginning 143 67,701  
Statement of operations 10,529 (67,558)  
Ending 10,672 143 67,701
Deferred tax assets deferred revenue [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Beginning 26,334 26,113  
Changes in accounting policy 15,809    
Statement of operations (2,502) 221  
Ending 39,641 26,334 26,113
Deferred tax assets real-estate sales [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Beginning 8,698 3,851  
Changes in accounting policy 661    
Statement of operations 12,369 4,847  
Ending 21,728 8,698 3,851
Deferred tax assets tax loss carryforward [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Beginning 2,699    
Statement of operations 1,364 2,699  
Ending 4,063 2,699  
Other deferred tax assets [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Beginning 247,702 193,956  
Changes in accounting policy 154    
Statement of operations 284,742 47,003  
Other comprehensive income (1,049) 6,743  
Ending 531,549 247,702 193,956
Deferred tax assets [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Beginning 1,458,591 1,390,417  
Changes in accounting policy 10,418    
Statement of operations 304,035 44,473  
Other comprehensive income 51,509 23,701  
Ending 1,673,777 1,458,591 1,390,417
Deferred tax assets defined benefit liabilities [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Beginning 467,049 372,492  
Statement of operations 3,980 67,751  
Other comprehensive income 42,813 26,806  
Ending 513,842 467,049 372,492
Deferred tax assets tax credit carry forwards [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Beginning 150,776 199,599  
Statement of operations (47,878) (48,823)  
Ending 102,898 150,776 199,599
Deferred tax liabilities contract assets [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Changes in accounting policy (23,663)    
Statement of operations 12,158    
Ending (11,505)    
Deferred tax liabilities financial assets at fair value through profit or loss [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Changes in accounting policy (30,856)    
Statement of operations 30,195    
Ending (661)    
Deferred tax liabilities Financial assets at fair value through other comprehensive income [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Changes in accounting policy (8,587)    
Statement of operations (17,638)    
Other comprehensive income (15,573)    
Ending (41,798)    
Deferred tax assets unsettled expenses [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Beginning 106,168    
Statement of operations 21,729    
Ending 127,897 106,168  
Deferred tax assets trade receivables [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Changes in accounting policy 2,890    
Statement of operations (1,293)    
Ending 1,597    
Temporary differences [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Beginning 432,984    
Changes in accounting policy (374,307)    
Statement of operations 62,894    
Other comprehensive income 36,115    
Ending 157,686 432,984  
Deferred tax liabilities [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Beginning (874,831) (826,688)  
Changes in accounting policy (384,725)    
Statement of operations (241,141) (46,244)  
Other comprehensive income (15,394) (1,899)  
Ending ₩ (1,516,091) ₩ (874,831) ₩ (826,688)