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Finance Income and Costs - Details of Finance Income and Costs (Detail) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Finance income      
Interest income ₩ 533,307 ₩ 576,782 ₩ 502,147
Dividend income 38,056 76,947 50,146
Gain on foreign currency transactions 1,339,770 1,419,887 1,660,713
Gain on foreign currency translations 722,904 1,187,507 292,581
Gain on derivatives transactions 298,505 437,999 333,197
Gain on valuations of derivatives 149,211 898,586 201,133
Gain on disposals of financial assets at fair value through profit of loss 58,487 164,556 203,795
Gain on valuations of financial assets at fair value through profit or loss 74,295 201,059 572,154
Gain on valuations of financial liabilities at fair value through profit or loss 0 239,120 0
Others 7,602 9,152 14,880
Finance income 3,222,137 5,211,595 3,830,746
Finance costs      
Interest expenses (1,091,462) (1,051,511) (1,001,290)
Loss on foreign currency transactions (1,354,094) (1,448,214) (1,595,430)
Loss on foreign currency translations (707,838) (1,900,405) (705,866)
Loss on derivatives transactions (435,463) (317,913) (320,374)
Loss on valuations of derivatives (69,366) (108,625) (77,459)
Loss on disposals of trade accounts and notes receivable (73,431) (82,615) (84,649)
Loss on disposals of financial assets at fair value through profit or loss (7,134) (27,857) (13,264)
Loss on valuations of financial assets at fair value through profit or loss (131,502) (80,515) (51,270)
Loss on valuations of financial liabilities at fair value through profit or loss (1,310) 0 (305,562)
Others (38,682) (63,080) (47,832)
Finance costs ₩ (3,910,282) ₩ (5,080,735) ₩ (4,202,996)