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Deferred Income Tax and Income Tax Expense - Summary of Tax on the Group's Profit Before Tax (Detail) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Deferred tax assets and liabilities [abstract]      
Profit before income tax expense ₩ 1,891,392 ₩ 1,978,411 ₩ 1,031,605
Statutory income tax expense 509,771 533,701 273,329
Tax effect      
Income not taxable for taxation purposes (47,550) (4,307) (24,657)
Non-deductible expenses 53,398 20,570 31,741
Tax credit (54,895) (31,517) (47,056)
Additional payment of income taxes 11,744 (221) 429
Adjustments in deferred tax from changes in tax rate (41,545)    
Tax effect and adjustment on consolidation      
Goodwill impairment 5,809    
Eliminated dividend income form subsidiaries   7,264 20,682
Changes of out-side tax effect 29,922 4,738 38,552
Intangible Asset impairment and amortization 5,276 796 3,790
Reversal expenses of contract cost assets (4,800) (2,932) (6,643)
Change In Scope Of Consolidation   (5,128)  
Others 38,627 (3,948) (4,818)
Income tax expense ₩ 505,757 ₩ 519,016 ₩ 285,349