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Deferred Income Tax and Income Tax Expense - Summary of Analysis of Deferred Tax Assets and Deferred Tax Liabilities (Detail) - KRW (₩)
₩ in Millions
Dec. 31, 2023
Dec. 31, 2022
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]    
Deferred income tax assets ₩ 614,500 ₩ 579,090
Deferred income tax liabilities (994,330) (967,650)
Gross carrying amount [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]    
Deferred income tax assets 2,228,333 2,306,400
Deferred income tax liabilities (2,608,163) (2,694,960)
Gross carrying amount [member] | Less than 1 year [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]    
Deferred income tax assets 404,234 398,710
Deferred income tax liabilities (491,817) (586,522)
Gross carrying amount [member] | Over 12 months [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]    
Deferred income tax assets 1,824,099 1,907,690
Deferred income tax liabilities ₩ (2,116,346) ₩ (2,108,438)