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Deferred Income Tax and Income Tax Expense - Summary of deferred tax assets and liabilities that are not recognized (Detail) - KRW (₩)
₩ in Millions
Dec. 31, 2022
Dec. 31, 2021
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deductible temporary differences for which no deferred tax asset is recognised ₩ 3,876,693 ₩ 2,583,033
Taxable Temporary Differences For Which No Deferred Tax Asset and Liabilities Is Recognised 1,073,736 568,540
Investment in subsidiaries, associates, and joint ventures    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deductible temporary differences for which no deferred tax asset is recognised 3,384,295 2,355,539
Taxable Temporary Differences For Which No Deferred Tax Asset and Liabilities Is Recognised 857,076 568,540
Unused tax loss    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deductible temporary differences for which no deferred tax asset is recognised 103,326 106,853
Unused Tax credit    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deductible temporary differences for which no deferred tax asset is recognised 1,988 1,376
Others    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deductible temporary differences for which no deferred tax asset is recognised 387,084 119,265
Others    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Taxable Temporary Differences For Which No Deferred Tax Asset and Liabilities Is Recognised ₩ 216,660 ₩ 0