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Reserves - Details of Reserves, Net of Taxes (Detail) - KRW (₩)
₩ in Millions
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of reserves within equity [abstract]      
Valuation gain on FVOCI ₩ 173,281 ₩ 633,240  
Other comprehensive gain (loss) of investments in associates and joint ventures 173,477 53,770  
Valuation gain on derivatives 14,463 33,918  
Foreign currency translation differences for foreign operations 30,012 14,310  
Total reserves, net of taxes ₩ 391,233 ₩ 735,238 ₩ 40,139