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Consolidated Statements of Cash Flows - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Cash flows from operating activities      
Profit ₩ 527,023 ₩ 1,005,276 ₩ 1,846,059
Adjustments for:      
Depreciation 3,693,288 3,530,770 3,346,461
Amortization 465,935 453,689 498,193
Finance income (1,645,330) (3,476,227) (1,850,756)
Finance costs 2,098,373 3,202,268 2,179,233
Income tax expense 612,135 320,954 789,367
Gain on disposal of property, plant and equipment (15,792) (26,533) (9,387)
Loss on disposal of property, plant and equipment 89,883 85,149 125,823
Impairment loss on property, plant and equipment 135,653 608,122 275,846
Gain on disposal of intangible assets (2,036) (8,570) (401)
Gain on disposal of investments in subsidiaries, associates and joint ventures (47,374) (14,235) (197,088)
Loss on disposal of investments in subsidiaries, associates and joint ventures 12,819 73,428 18,843
Share of loss (profit) of equity-accounted investees (349,910) 256,458 (269,678)
Expenses related to post-employment benefits 264,232 246,484 206,614
Increase to provisions 410,522 217,174 160,880
Impairment loss on trade and other receivables 203,802 185,129 265,914
Loss on (reversal of) valuation of inventories (25,482) 77,832 309,317
Impairment loss on goodwill and intangible assets 51,640 47,993 129,907
Gain on disposal of assets held for sale (53,692) (4,801) (1,312)
Loss on disposal of assets held for sale 13,104 33,943 103,366
Gain on insurance claim (19,596) (157,552) (7,682)
Others, net (4,216) 11,797 (43,415)
Adjustments to reconcile profit (loss) other than changes in working capital 5,887,958 5,663,272 6,030,045
Changes in operating assets and liabilities (776,207) 261,841 (1,087,529)
Interest received 421,430 570,769 447,621
Interest paid (1,085,791) (1,028,654) (1,038,005)
Dividends received 437,835 744,857 696,941
Income taxes paid (840,338) (553,706) (727,437)
Net cash provided by operating activities 4,571,910 6,663,655 6,167,695
Cash flows from investing activities      
Acquisitions of short-term financial instruments (15,987,580) (15,835,323) (39,830,719)
Proceeds from disposal of short-term financial instruments 16,093,407 19,501,852 40,174,440
Acquisitions of long-term financial instruments (19,921) (3,791) (5,362)
Increase in loans (277,442) (820,248) (1,238,668)
Collection of loans 100,034 784,616 1,369,763
Acquisitions of securities (836,079) (1,144,352) (380,744)
Proceeds from disposal of securities 489,046 1,210,011 142,791
Acquisitions of investments in associates and joint ventures (213,279) (301,816) (417,603)
Proceeds from disposal of investments in associates and joint ventures 39,170 45,185 142,316
Acquisitions of property, plant and equipment (5,665,151) (7,669,700) (6,733,289)
Proceeds from (payment for) disposal of property, plant and equipment 214,126 44,189 (11,895)
Acquisitions of investment property (3,614) (3,883) (56,043)
Proceeds from disposal of investment property 1,403 418 707
Acquisitions of intangible assets (576,029) (492,785) (481,882)
Proceeds from disposal of intangible assets 7,910 11,711 30,328
Proceeds from disposal of assets held for sale 846,102 10,307 4,850
Collection of lease receivables 25,480 31,136 52,657
Cash outflows due to business combinations, net of cash acquired 0 0 (150,201)
Net assets acquired due to changes in the scope of consolidation (807,255) 0 0
Net assets disposed due to changes in the scope of consolidation 71,597 0 0
Cash inflow from insurance claim 19,596 157,278 7,682
Others, net (208,799) (11,588) (7,352)
Net cash used in investing activities (6,687,278) (4,486,783) (7,388,224)
Cash flows from financing activities      
Proceeds from borrowings 5,393,340 5,899,541 7,817,217
Repayment of borrowings (5,158,334) (7,532,911) (4,461,114)
Proceeds from (repayment of) short-term borrowings, net 2,158,541 (217,759) (2,524,077)
Payment of cash dividends (915,216) (844,195) (815,451)
Repayment of hybrid bonds 0 0 (340,000)
Payment of interest of hybrid bonds 0 0 (10,043)
Capital contribution from non-controlling interests and proceeds from disposal of subsidiary while maintaining control 832,430 513,710 299,342
Capital deduction from non-controlling interests and additional acquisition of interests in subsidiaries (4,436) (19,080) (9,721)
Repayment of lease liabilities (143,423) (195,367) (222,829)
Acquisition of treasury shares 0 (92,311) 0
Others, net 239,946 186,639 88,083
Net cash provided by (used in) financing activities 2,402,848 (2,301,733) (178,593)
Effect of exchange rate fluctuation on cash held (5,578) 221,880 16,719
Net increase (decrease) in cash and cash equivalents 281,902 97,019 (1,382,403)
Cash and cash equivalents at beginning of the period 6,767,898 6,670,879 8,053,282
Cash and cash equivalents at end of the period ₩ 7,049,800 ₩ 6,767,898 ₩ 6,670,879