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Other Operating Income and Expenses - Details of Other Operating Income and Expenses (Detail) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Other operating income      
Recovery of allowance for other bad debt expenses ₩ 18,513 ₩ 18,080 ₩ 7,641
Gain on disposals of assets held for sale 53,692 4,801 1,312
Gain on disposals of investments in subsidiaries, associates and joint ventures 47,374 14,235 197,088
Gain on disposals of property, plant and equipment 15,792 26,533 9,387
Gain on valuation of firm commitment 42,010 46,918 11,499
Reversal of other provisions 8,132 15,834 8,578
Gain on insurance claim 19,596 157,552 13,117
Gain on bargain purchase 0 0 41,072
Gain on disposals of emission rights 8 2 25,998
Miscellaneous income 94,231 90,485 77,946
Others 6,243 12,665 8,348
Other operating income 305,591 387,105 401,986
Other operating expenses      
Other bad debt expenses (53,355) (68,979) (291,340)
Loss on disposals of assets held for sale (13,104) (33,943) (103,366)
Loss on disposals of investments in subsidiaries, associates and joint ventures (12,819) (73,428) (18,843)
Loss on disposals of property, plant and equipment (89,883) (85,149) (125,823)
Impairment loss on property, plant and equipment (135,653) (608,122) (275,846)
Impairment loss on intangible assets (51,640) (47,993) (129,907)
Loss on valuation of firm commitment (28,072) (40,383) (47,448)
Idle tangible asset expenses (5,517) (3,047) (3,703)
Increase to provisions (55,637) (84,689) (38,395)
Donations (90,443) (75,261) (67,393)
Miscellaneous expenses (81,560) (46,233) (92,870)
Others (8,891) (16,649) (749)
Other operating expenses ₩ (626,574) ₩ (1,183,876) ₩ (1,195,683)