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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Beginning ₩ 260,584 ₩ 583,760  
Changes in accounting policy   (374,307)  
Statement of operations (199,527) 15,016 ₩ (1,771)
Other comprehensive income (61,669) 36,115  
Ending (612) 260,584 583,760
Deferred tax liabilities derivative assets [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Statement of operations (10,250)    
Other comprehensive income (648)    
Ending (10,898)    
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)  
Changes in accounting policy   30,520  
Ending     (30,520)
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 (93,604) (96,650)  
Statement of operations (14,622) 2,867  
Other comprehensive income 35 179  
Ending (108,191) (93,604) (96,650)
Deferred tax liabilities depreciation [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Beginning (424)    
Statement of operations (11,182) (424)  
Ending (11,606) (424)  
Deferred tax liabilities advanced depreciation provision [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Beginning (313,184) (248,592)  
Statement of operations 63 (64,592)  
Ending (313,121) (313,184) (248,592)
Deferred tax liabilities deposits for severance benefits [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Beginning (398,982) (387,856)  
Statement of operations (99,126) (11,126)  
Other comprehensive income 1,255    
Ending (496,853) (398,982) (387,856)
Deferred tax liabilities accrued income [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Beginning (1,558) (2,150)  
Statement of operations 17 592  
Ending (1,541) (1,558) (2,150)
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 (204) (314)  
Statement of operations   110  
Ending (204) (204) (314)
Other deferred tax liabilities [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Beginning (284,255) (108,749)  
Statement of operations (238,725) (175,506)  
Other comprehensive income (170)    
Ending (523,150) (284,255) (108,749)
Deferred tax liabilities prepaid expenses [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Beginning (369,916)    
Changes in accounting policy   (352,139)  
Statement of operations (40,947) (17,777)  
Ending (410,863) (369,916)  
Deferred tax derivative assets [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Beginning 8,341 24,724  
Statement of operations (850) (26,128)  
Other comprehensive income (7,491) 9,745  
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 99,887 121,656  
Changes in accounting policy   (9,096)  
Statement of operations (15,816) (12,673)  
Ending 84,071 99,887 121,656
Deferred tax assets inventory valuation [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Beginning 121    
Statement of operations (98) 121  
Ending 23 121  
Deferred tax assets contribution for construction [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Beginning 16,800 18,271  
Statement of operations (646) (1,471)  
Ending 16,154 16,800 18,271
Deferred tax assets accrued expenses [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Beginning 127,897 106,168  
Statement of operations   21,729  
Ending   127,897 106,168
Deferred Tax Assets Provisions [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Beginning 36,178 24,079  
Statement of operations (3,354) 12,099  
Ending 32,824 36,178 24,079
Deferred tax assets property, plant and equipment [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Beginning 230,278 232,074  
Statement of operations (1,623) (1,796)  
Ending 228,655 230,278 232,074
Deferred Tax assets assets retirement obligation [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Beginning 24,532 20,836  
Statement of operations 4,484 3,696  
Ending 29,016 24,532 20,836
Deferred tax assets withholding of facilities expenses [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Beginning 6,609 7,382  
Statement of operations (426) (773)  
Ending 6,183 6,609 7,382
Deferred tax assets deduction of installment receivables [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Beginning 42    
Statement of operations 6 42  
Ending 48 42  
Deferred tax assets gain or loss foreign currency translation [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Beginning 10,672 143  
Statement of operations 10,005 10,529  
Ending 20,677 10,672 143
Deferred tax assets deferred revenue [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Beginning 39,641 26,334  
Changes in accounting policy   15,809  
Statement of operations (3,841) (2,502)  
Ending 35,800 39,641 26,334
Deferred tax assets real-estate sales [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Beginning 21,728 8,698  
Changes in accounting policy   661  
Statement of operations (8,043) 12,369  
Ending 13,685 21,728 8,698
Deferred tax assets tax loss carryforward [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Beginning 4,063 2,699  
Statement of operations   1,364  
Ending   4,063 2,699
Other deferred tax assets [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Beginning 531,549 247,702  
Changes in accounting policy   154  
Statement of operations 174,177 284,742  
Other comprehensive income (2,949) (1,049)  
Ending 708,437 531,549 247,702
Deferred tax assets [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Beginning 1,673,777 1,307,815  
Changes in accounting policy   10,418  
Statement of operations 235,361 304,035  
Other comprehensive income (3,658) 51,509  
Ending 1,905,480 1,673,777 1,307,815
Deferred tax assets defined benefit liabilities [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Beginning 513,842 467,049  
Statement of operations 48,847 3,980  
Other comprehensive income 6,782 42,813  
Ending 569,471 513,842 467,049
Deferred tax assets tax credit carry forwards [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Beginning 102,898 150,776  
Statement of operations 25,347 (47,878)  
Ending 128,245 102,898 150,776
Deferred tax liabilities contract assets [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Beginning (11,505)    
Changes in accounting policy   (23,663)  
Statement of operations (42,245) 12,158  
Ending (53,750) (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]      
Beginning (661)    
Changes in accounting policy   (30,856)  
Statement of operations 338 30,195  
Ending (323) (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]      
Beginning (41,798)    
Changes in accounting policy   (8,587)  
Statement of operations (3,556) (17,638)  
Other comprehensive income (58,483) (15,573)  
Ending (103,837) (41,798)  
Deferred tax assets unsettled expenses [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Beginning 127,897    
Statement of operations 32,539    
Ending 160,436 127,897  
Deferred tax assets trade receivables [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Beginning 1,597    
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 157,686 432,984  
Changes in accounting policy   (374,307)  
Statement of operations (224,874) 62,894  
Other comprehensive income (61,669) 36,115  
Ending (128,857) 157,686 432,984
Deferred tax liabilities [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Beginning (1,516,091) (874,831)  
Changes in accounting policy   (384,725)  
Statement of operations (460,235) (241,141)  
Other comprehensive income (58,011) (15,394)  
Ending ₩ (2,034,337) ₩ (1,516,091) ₩ (874,831)