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Consolidated Statements of Cash Flows - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Cash flows from operating activities      
Profit(loss) for the year ₩ 3,621,968 ₩ (4,716,144) ₩ (24,429,108)
Adjustments to reconcile profit (loss) for the year to net cash provided by (used in) operating activities:      
Income tax expense (benefit) 1,634,561 (2,837,833) (9,414,511)
Depreciation 13,833,788 12,869,089 12,305,252
Amortization 163,567 163,174 156,160
Employee benefit expense 427,980 358,730 485,700
Bad debt expense 60,309 101,550 29,997
Interest expense 4,665,095 4,451,659 2,818,546
Loss on disposal of financial assets 434 1 1,841
Loss on disposal of property, plant and equipment 112,018 98,120 100,066
Loss on abandonment of property, plant and equipment 195,697 196,697 160,909
Loss (gain) on impairment of property, plant and equipment 11,240 17,031 (97,425)
Loss on impairment of intangible assets 902 2,865 164
Loss on disposal of intangible assets 111 71 116
Increase in provisions 1,762,526 1,611,082 2,146,979
Loss on foreign currency translation, net 2,366,830 363,659 523,285
Gain on valuation of financial assets at fair value through profit or loss (83,408) (152,322) (7,099)
Loss on valuation of financial assets at fair value through profit or loss 14,247 24,015 44,329
Valuation and transaction gain on derivative instruments, net (2,406,368) (323,858) (448,903)
Gain on valuation of investments in associates and joint ventures, net (755,452) (595,056) (1,338,293)
Gain on disposal of financial assets (45,493) (13,162) (11,199)
Gain on disposal of property, plant and equipment (85,990) (32,196) (148,667)
Gain on disposal of intangible assets (41) (136) (41)
Gain on disposal of investments in associates and joint ventures (186,066) (18,204) (11,091)
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
Reversal of impairment loss on investments in associates and joint ventures (10,527) (347) 0
Gain on disposal of subsidiaries (98) (2) 0
Loss on disposal of investments in subsidiaries 0 564 32,144
Interest income (467,525) (429,620) (340,753)
Dividend income (70,601) (25,941) (28,875)
Others, net (76,125) 6,910 215,943
Adjustments to reconcile profit (loss) for the year to net cash provided by operating activities 21,131,434 15,836,559 7,181,423
Changes in working capital:      
Trade receivables 2,702 (1,484,134) (1,909,649)
Non-trade receivables (191,526) 625,993 80,444
Accrued income (189,995) (258,993) (34,706)
Other receivables 101,042 56,460 80,236
Other current assets (656,588) 251,842 (651,926)
Inventories (1,412,713) 147,798 (3,000,669)
Other non-current assets 108,625 (101,576) 58,790
Trade payables 109,214 (3,154,822) 2,782,474
Non-trade payables (97,540) (960,450) 61,737
Accrued expenses (508,199) (228,464) (191,681)
Other current liabilities (2,261,294) 901,692 446,064
Other non-current liabilities 2,892,947 437,809 422,916
Investments in associates and joint ventures (dividends received) 364,287 592,812 473,700
Provisions (1,588,396) (1,497,699) (1,564,243)
Payments of employee benefit obligations (208,248) (281,383) (218,319)
Plan assets (254,763) (188,566) (347,778)
Changes in working capital (3,790,445) (5,141,681) (3,512,610)
Cash generated from operating activities 20,962,957 5,978,734 (20,760,295)
Dividends received (financial assets at fair value through other comprehensive income) 12,243 25,941 28,875
Interest paid (4,697,442) (4,245,838) (2,517,694)
Interest received 390,671 329,740 220,471
Income taxes paid (792,313) (566,415) (448,857)
Net cash provided by (used in) operating activities 15,876,116 1,522,162 (23,477,500)
Cash flows from investing activities      
Proceeds from disposals of investments in associates and joint ventures 236,624 5,806 56,171
Acquisition of investments in associates and joint ventures (451,813) (497,634) (360,962)
Proceeds from disposals of property, plant and equipment 402,603 309,627 629,924
Acquisition of property, plant and equipment (14,216,037) (13,908,373) (12,346,878)
Proceeds from disposals of intangible assets 428 153 279
Acquisition of intangible assets (91,851) (74,832) (80,508)
Proceeds from disposals of investment properties 0 0 515
Proceeds from disposals of financial assets 2,615,341 4,389,228 14,182,348
Acquisition of financial assets (2,536,994) (3,141,906) (16,496,258)
Increase in loans (172,849) (212,994) (401,377)
Collection of loans 226,935 124,386 102,061
Increase in deposits (154,503) (138,205) (237,266)
Decrease in deposits 152,803 130,221 141,000
Proceeds from disposals of assets held-for-sale 28,727 28,727 24,205
Receipt of government grants 59,503 57,207 50,755
Net cash outflow from changes in consolidation scope (2,740) (25,849) (31,350)
Other cash outflow from investing activities, net (189,284) (119,319) (186,412)
Net cash used in investing activities (14,093,107) (13,073,757) (14,953,753)
Cash flows from financing activities      
Proceeds from (Repayment of) short-term borrowings, net (1,536,401) 1,842,517 5,852,426
Proceeds from long-term borrowings 2,795,823 3,434,452 6,856,321
Proceeds from debt securities 20,476,245 18,402,589 36,737,757
Repayment of long-term borrowings (654,581) (870,586) (812,428)
Repayment of debt securities (24,687,409) (10,116,048) (9,440,260)
Payment of lease liabilities (612,828) (574,239) (562,646)
Settlement of derivative instruments, net 545,483 332,263 407,627
Change in non-controlling interests (35,986) 218,766 175,645
Repayment of hybrid bond 0 0 (169,537)
Dividends paid (hybrid bond) (10,316) (10,212) (13,461)
Dividends paid (126,903) (45,323) (42,348)
Other cash inflow (outflow) from financing activities, net (2,428) 47,703 8,803
Net cash provided by (used in) financing activities (3,849,301) 12,661,882 38,997,899
Net increase (decrease) in cash and cash equivalents before effect of exchange rate fluctuations (2,066,292) 1,110,287 566,646
Effect of exchange rate fluctuations on cash held 106,384 (2,180) 32,896
Net increase (decrease) in cash and cash equivalents (1,959,908) 1,108,107 599,542
Cash and cash equivalents at January 1 4,342,887 3,234,780 2,635,238
Cash and cash equivalents at December 31 ₩ 2,382,979 ₩ 4,342,887 ₩ 3,234,780