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Financial Instruments - Impairment Losses on Financial Assets (Detail) - KRW (₩)
₩ in Millions
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Disclosure of financial assets [line items]    
Beginning ₩ 1,114,370 ₩ 952,719
Others 51,618 47,873
Ending 1,365,104 1,114,370
Bad debt expenses [member]    
Disclosure of financial assets [line items]    
Impairment loss on financial assets 168,960 134,230
Others [member]    
Disclosure of financial assets [line items]    
Impairment loss on financial assets [1] 53,355 68,979
Less: Recovery of allowance for other bad debt accounts (18,513) (18,080)
Others [2] ₩ 46,932 ₩ (23,478)
[1] Other bad debt expenses are mainly related to loans and other accounts receivable.
[2] Others for the years ended December 31, 2024 and 2025, include write-off amounting to ₩75,349 million and ₩33,648 million, respectively.