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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)

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