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Deferred Income Tax and Income Tax Expense - Summary of expected period of expiry for unused tax losses not recognized in deferred tax assets (Detail) - KRW (₩)
₩ in Millions
Dec. 31, 2022
Dec. 31, 2021
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax losses for which no deferred tax asset recognised ₩ 103,326 ₩ 106,853
2022    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax losses for which no deferred tax asset recognised   4,249
2023    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax losses for which no deferred tax asset recognised 72,512 76,133
2024    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax losses for which no deferred tax asset recognised 5,011 4,484
2025    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax losses for which no deferred tax asset recognised 3,701 2,836
2026    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax losses for which no deferred tax asset recognised 2,112 2,390
2027    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax losses for which no deferred tax asset recognised 2,534 3,419
2028    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax losses for which no deferred tax asset recognised 396 2,091
2029    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax losses for which no deferred tax asset recognised 617 2,579
2030    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax losses for which no deferred tax asset recognised 2,198 3,111
2031    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax losses for which no deferred tax asset recognised 1,360 1,841
After 2032    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax losses for which no deferred tax asset recognised ₩ 12,885 ₩ 3,720