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Consolidated Statements of Comprehensive Income or Loss - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Statement of comprehensive income [abstract]      
Total revenue from external customers (Notes 4, 35, 45, 47) ₩ 92,578,265 ₩ 87,476,410 ₩ 70,546,024
Sales of goods (Note 2) 91,018,712 85,940,137 69,184,469
Sales of construction services (Note 20) 849,108 785,395 646,953
Sales of services 710,445 750,878 714,602
Cost of sales (Notes 2,14,25,43 and 47) (81,964,160) (89,699,527) (100,903,594)
Cost of sales of goods (80,221,013) (88,066,120) (99,441,768)
Cost of sales of construction services (1,185,886) (1,003,601) (941,254)
Cost of sales of services (557,261) (629,806) (520,572)
Gross profit (loss) 10,614,105 (2,223,117) (30,357,570)
Selling and administrative expenses (Notes 25,36,43 and 47) (3,070,026) (3,061,582) (3,009,422)
Other income (Note 28 and 37) 1,297,985 1,275,902 1,095,489
Other expenses (Note 37) (465,688) (258,905) (212,150)
Other gains, net (Note 38) 84,884 22,686 243,122
Operating profit (loss) (Note 4) 8,461,260 (4,245,016) (32,240,531)
Finance income (Notes 5,12 and 39) 3,448,177 1,425,031 1,833,312
Finance expenses (Notes 5,12 and 40) (7,535,228) (5,347,018) (4,746,791)
Gain on valuation of investments in associates and joint ventures 937,959 804,141 1,393,486
Gain on disposal of investments in associates and joint ventures 186,066 18,204 11,091
Reversal of impairment loss on investments in associates and joint ventures 10,527 347 0
Gain on disposal of investments in subsidiaries 98 2 0
Loss on valuation of investments in associates and joint ventures (182,507) (209,085) (55,193)
Loss on disposal of investments in associates and joint ventures (650) 0 (1,675)
Loss on impairment of investments in associates and joint ventures (69,173) (19) (5,174)
Loss on disposal of investments in subsidiaries 0 (564) (32,144)
Profit (loss) related to associates, joint ventures and subsidiaries (Notes 4,16 and 17) 882,320 613,026 1,310,391
Profit(loss) before income tax 5,256,529 (7,553,977) (33,843,619)
Income tax benefit (expense) (Note 41) (1,634,561) 2,837,833 9,414,511
Profit (loss) for the year 3,621,968 (4,716,144) (24,429,108)
Other comprehensive income (loss), net of tax (Notes 5,12,25,31 and 34) 629,001 (228,672) 1,246,869
Items that will not be reclassified subsequently to profit or loss:      
Remeasurements of defined benefit liability (Notes 25 and 31) (296,135) (271,724) 663,095
Share of other comprehensive income (loss) of associates and joint ventures (Note 31) (6,346) (27,349) 12,305
Net change in fair value of financial assets at fair value through other comprehensive income (loss) (Note 34) 100,759 (31,665) 58,010
Items that may be reclassified subsequently to profit or loss:      
Net change in the unrealized fair value of derivatives using cash flow hedge accounting (Notes 5, 12 and 34) 11,870 (3,654) (24,415)
Foreign currency translation of foreign operations (Note 34) 164,628 (17,274) 28,387
Share of other comprehensive income of associates and joint ventures (Note 34) 654,225 122,994 509,487
Total comprehensive income (loss) for the year 4,250,969 (4,944,816) (23,182,239)
Profit (loss) attributable to:      
Owners of the controlling company (Note 44) 3,491,698 (4,822,549) (24,466,853)
Non-controlling interests 130,270 106,405 37,745
Profit (loss) for the year 3,621,968 (4,716,144) (24,429,108)
Total comprehensive income (loss) attributable to:      
Owners of the controlling company 4,070,175 (5,032,584) (23,273,171)
Non-controlling interests 180,794 87,768 90,932
Total comprehensive income (loss) for the year ₩ 4,250,969 ₩ (4,944,816) ₩ (23,182,239)
Earnings (loss) per share (in won) (Note 44)      
Basic earnings (loss) per share ₩ 5,439 ₩ (7,512) ₩ (38,112)
Diluted earnings (loss) per share ₩ 5,439 ₩ (7,512) ₩ (38,112)