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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, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Beginning ₩ 563,729 ₩ 715,747  
Statement of operations (1,771) (152,102) ₩ (232,134)
Other comprehensive income 21,802 84  
Ending 583,760 563,729 715,747
Deferred tax derivative liabilities [Member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Beginning (49,188) (19,155)  
Statement of operations 49,188 (33,569)  
Other comprehensive income   3,536  
Ending   (49,188) (19,155)
Deferred tax liabilities available for sale financial assets [Member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Beginning (31,702) (29,430)  
Statement of operations (164) (10)  
Other comprehensive income 1,346 (2,262)  
Ending (30,520) (31,702) (29,430)
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 (50,746) (50,235)  
Statement of operations (42,659) (666)  
Other comprehensive income (3,245) 155  
Ending (96,650) (50,746) (50,235)
Deferred tax liabilities depreciation [Member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Beginning (39,498) (53,872)  
Statement of operations 39,498 14,374  
Ending   (39,498) (53,872)
Deferred tax liabilities advanced depreciation provision [Member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Beginning (225,687) (231,692)  
Statement of operations (22,905) 6,005  
Ending (248,592) (225,687) (231,692)
Deferred tax liabilities deposits for severance benefits [Member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Beginning (307,730) (251,924)  
Statement of operations (80,126) (55,806)  
Ending (387,856) (307,730) (251,924)
Deferred tax liabilities accrued income [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Beginning (2,024) (1,808)  
Statement of operations (126) (216)  
Ending (2,150) (2,024) (1,808)
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 (747) (1,216)  
Statement of operations 433 469  
Ending (314) (747) (1,216)
Other deferred tax liabilities [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Beginning (119,366) (135,802)  
Statement of operations 10,617 16,436  
Ending (108,749) (119,366) (135,802)
Deferred tax liabilities [Member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Beginning (826,688) (775,134)  
Statement of operations (46,244) (52,983)  
Other comprehensive income (1,899) 1,429  
Ending (874,831) (826,688) (775,134)
Deferred tax derivative assets [Member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Statement of operations 34,572    
Other comprehensive income (9,848)    
Ending 24,724    
Deferred tax assets provision for impairment on trade receivables [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Beginning 110,276 136,743  
Statement of operations 11,380 (26,467)  
Ending 121,656 110,276 136,743
Deferred tax assets inventory valuation [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Beginning 48 56  
Statement of operations (48) (8)  
Ending   48 56
Deferred tax assets contribution for construction [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Beginning 18,091 19,618  
Statement of operations 180 (1,527)  
Ending 18,271 18,091 19,618
Deferred tax assets accrued expenses [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Beginning 80,356 64,117  
Statement of operations 10,683 16,239  
Ending 91,039 80,356 64,117
Deferred Tax Assets Provisions [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Beginning 20,221 20,353  
Statement of operations 3,858 (132)  
Ending 24,079 20,221 20,353
Deferred tax assets property, plant and equipment [Member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Beginning 232,915 239,791  
Statement of operations (841) (6,876)  
Ending 232,074 232,915 239,791
Deferred tax assets retirement benefit obligations [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Beginning 372,492 331,980  
Statement of operations 67,751 41,857  
Other comprehensive income 26,806 (1,345)  
Ending 467,049 372,492 331,980
Deferred tax assets withholding of facilities expenses [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Beginning 6,910 7,360  
Statement of operations 472 (450)  
Ending 7,382 6,910 7,360
Deferred tax assets accrued payroll expenses [Member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Beginning 25,915 21,634  
Statement of operations (10,786) 4,281  
Ending 15,129 25,915 21,634
Deferred tax assets deduction of installment receivables [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Beginning 13,887 10,513  
Statement of operations (13,887) 3,374  
Ending   13,887 10,513
Deferred Tax assets assets retirement obligation [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Beginning 18,086 16,974  
Statement of operations 2,750 1,112  
Ending 20,836 18,086 16,974
Deferred tax assets gain or loss foreign currency translation [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Beginning 67,701 43,283  
Statement of operations (67,558) 24,418  
Ending 143 67,701 43,283
Deferred tax assets deferred revenue [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Beginning 26,113 43,792  
Statement of operations 221 (17,679)  
Ending 26,334 26,113 43,792
Deferred tax assets real-estate sales [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Beginning 3,851 2,980  
Statement of operations 4,847 871  
Ending 8,698 3,851 2,980
Deferred tax assets tax credit carry forwards [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Beginning 199,599 212,820  
Statement of operations (48,823) (13,221)  
Ending 150,776 199,599 212,820
Deferred tax assets accumulated deficit [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Beginning   107,485  
Statement of operations   (107,485)  
Ending     107,485
Deferred tax assets deficit carried over [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Statement of operations 2,699    
Ending 2,699    
Other deferred tax assets [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Beginning 193,956 211,382  
Statement of operations 47,003 (17,426)  
Other comprehensive income 6,743    
Ending 247,702 193,956 211,382
Deferred tax assets [Member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Beginning 1,390,417 1,490,881  
Statement of operations 44,473 (99,119)  
Other comprehensive income 23,701 (1,345)  
Ending ₩ 1,458,591 ₩ 1,390,417 ₩ 1,490,881