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Consolidated Statements Of Cash Flows - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Cash flows provided by operating activities      
Profit (loss) for the period ₩ 2,092,469 ₩ (2,263,535) ₩ (1,174,498)
Adjustments for:      
Income Tax expense (benefit) 899,064 (1,002,303) (826,321)
Depreciation 11,377,553 10,971,825 9,905,856
Amortization 170,466 156,915 118,938
Employee benefit expense 492,288 725,120 360,575
Bad debt expense 50,686 16,629 57,468
Interest expense 1,995,425 2,046,811 1,868,458
Loss on sale of financial assets 648 2,106 1
Loss on disposals of property, plant and equipment 162,725 72,508 60,704
Loss on abandonment of property, plant, and equipment 255,346 364,233 481,176
Impairment loss on property, plant and equipment 80,413 50,034 710,162
Impairment loss on intangible assets 3,599 513,609 8,112
Loss on disposal of intangible assets 392 827 43
Increase to provisions 1,832,765 2,301,215 1,056,994
Loss (gain) on foreign currency translation, net (782,167) 370,309 243,378
Gain on valuation of financial assets at fair value through profit or loss (12,904) (5,575) (8,495)
Loss on valuation of financial assets at fair value through profit or loss 7,396 4,513 6,616
Valuation and transaction loss (gain) on derivative instruments, net 390,322 (403,765) (300,500)
Share in loss (profit) of associates and joint ventures, net (279,124) (166,820) (363,101)
Gain on disposal of financial assets (11,992) (3,866) (1,838)
Gain on disposal of property plant, and equipment (93,195) (43,784) (98,077)
Gain on disposal of intangible assets (1,556) (206) (12)
Gain on disposal of investments in associates and joint ventures (10,165) (70,094) (5,079)
Loss on disposal of investments in associates and joint ventures 16 2 2,183
Impairment loss on investments in associates and joint ventures 1,556 22,517 7,907
Gain on disposal of investments in subsidiaries 0 0 (72)
Loss on disposal of investments in subsidiaries 6,610 256 0
Interest income (242,586) (268,118) (223,767)
Dividend income (7,316) (13,838) (12,777)
Other inflows (outflows) of cash 30,411 128,237 81,317
Adjustments for Cash flows from operating activities 16,316,676 15,769,297 13,129,849
Changes in:      
Trade receivables (107,639) 95,345 246,755
Non-trade receivables 459,524 64,027 154,580
Accrued income (258,963) 83,589 (484,718)
Other receivables (32,536) (116,583) (61,961)
Other current assets (462,125) (271,986) (148,509)
Inventories (723,495) (980,216) (1,771,550)
Other non-current assets (140,017) (611,066) (54,148)
Trade payables (262,985) (546,159) 478,744
Non-trade payables (363,260) 192,506 (292,912)
Accrued expenses (222,113) (454,501) (361,204)
Other current liabilities 388,163 373,403 250,112
Other non-current liabilities 755,005 650,468 287,488
Investments in associates and joint ventures (dividends received) 237,695 215,612 175,175
Provisions (1,499,436) (1,473,461) (1,132,969)
Payments of employee benefit obligations (74,848) (65,242) (89,253)
Plan assets (582,275) (348,386) (330,064)
Changes in assets and liabilities Cash flows from operating activities (2,889,305) (3,192,650) (3,134,434)
Cash generated from operating activities 15,519,840 10,313,112 8,820,917
Dividends received (financial assets at fair value through other comprehensive income) 7,316 24,255 11,182
Interest paid (2,081,663) (2,027,850) (1,895,898)
Interest received 215,183 186,122 194,221
Income taxes paid (452,203) (282,211) (450,290)
Net cash flows from operating activities 13,208,473 8,213,428 6,680,132
Cash flows provided by investing activities      
Proceeds from disposals of investments in associates and joint ventures 5,444 0 1,617
Acquisition of investments in associates and joint ventures (342,116) (107,821) (319,425)
Proceeds from sales of property, plant and equipment 331,777 522,742 234,138
Acquisition of property, plant and equipment (13,281,294) (14,000,359) (12,266,870)
Proceeds from sales of intangible assets 10,871 7,702 13
Acquisition of intangible assets (120,371) (229,426) (110,587)
Proceeds from disposals of financial assets 8,020,406 2,783,474 2,419,259
Acquisition of financial assets (9,203,450) (2,165,342) (2,841,651)
Increase in loans (336,744) (335,773) (188,675)
Collection of loans 215,292 292,745 100,010
Increase in deposits (276,255) (280,637) (299,564)
Decrease in deposits 280,941 275,314 259,930
Proceeds from disposals of assets held-for-sale 32,578 30,662 18,716
Receipt of government grants 41,209 21,705 30,416
Cash outflow from merger 0 (154,311) 0
Net cash inflow (outflow) from changes in consolidation scope (24,624) (2,917) 2,141
Other cash inflow (outflow) from investing activities, net (185,475) (157,116) (53,769)
Net cash flows used in investing activities (14,831,811) (13,499,358) (13,014,301)
Cash flows provided by financing activities      
Proceeds from (Repayment of) short-term borrowings, Net 345,338 188,957 (183,660)
Proceeds from long-term borrowings and debt securities 10,170,107 13,221,407 14,251,586
Repayment of long-term borrowings and debt securities (7,976,658) (7,068,290) (8,095,590)
Payment of lease liabilities (613,977) (573,437) (134,454)
Settlement of derivative instruments, net 42,263 102,146 60,907
Change in non-controlling interests 11,554 17,365 20,113
Dividends paid (hybrid bond) (13,385) (13,385) (17,658)
Dividends paid (81,298) (99,356) (599,391)
Other cash outflow from financing activities, net (3,120) 0 (175)
Net cash from financing activities 1,880,824 5,775,407 5,301,678
Net increase (decrease) in cash and cash equivalents before effect of exchange rate fluctuations 257,486 489,477 (1,032,491)
Effect of exchange rate fluctuations on cash held (38,031) (37,693) 21,097
Net increase (decrease) in cash and cash equivalents 219,455 451,784 (1,011,394)
Cash and cash equivalents at January 1 1,810,129 1,358,345 2,369,739
Cash and cash equivalents at December 31 ₩ 2,029,584 ₩ 1,810,129 ₩ 1,358,345