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Reserves - Changes in Reserves (Detail) - KRW (₩)
₩ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Disclosure of reserves within equity [Line Items]    
Balance as of December 31 ₩ 735,238 ₩ 40,139
Changes, net of taxes (344,005) 695,099
Balance as of December 31 391,233 735,238
Valuation gain (loss) on financial assets at FVOCI [member]    
Disclosure of reserves within equity [Line Items]    
Balance as of December 31 633,240 438,979
Changes, net of taxes (459,959) 194,261
Balance as of December 31 173,281 633,240
Other comprehensive loss of investments in associates [Member]    
Disclosure of reserves within equity [Line Items]    
Balance as of December 31 53,770 (392,333)
Changes, net of taxes 119,707 446,103
Balance as of December 31 173,477 53,770
Valuation gain (loss) on derivatives [Member]    
Disclosure of reserves within equity [Line Items]    
Balance as of December 31 33,918 17,615
Changes, net of taxes (19,455) 16,303
Balance as of December 31 14,463 33,918
Foreign currency translation differences for foreign operations [Member]    
Disclosure of reserves within equity [Line Items]    
Balance as of December 31 14,310 (24,122)
Changes, net of taxes 15,702 38,432
Balance as of December 31 ₩ 30,012 ₩ 14,310