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Consolidated Statements Of Cash Flows - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Cash flows provided by operating activities      
Profit (loss) for the period ₩ (2,263,535) ₩ (1,174,498) ₩ 1,441,394
Adjustments for:      
Income Tax expense (benefit) (1,002,303) (826,321) 2,172,824
Depreciation 10,971,825 9,905,856 9,660,039
Amortization 156,915 118,938 113,672
Employee benefit expense 725,120 360,575 391,360
Bad debt expense 16,629 57,468 126,326
Interest expense 2,046,811 1,868,458 1,789,552
Loss on sale of financial assets 2,106 1 2,343
Loss on disposals of property, plant and equipment 72,508 60,704 70,514
Loss on abandonment of property, plant, and equipment 364,233 481,176 424,091
Impairment loss on property, plant and equipment 50,034 710,162 51,067
Impairment loss on intangible assets 513,609 8,112 20
Loss on disposal of intangible assets 827 43 183
Increase to provisions 2,301,215 1,056,994 1,690,120
Loss (gain) on foreign currency translation, net 370,309 243,378 (902,878)
Gain on valuation of financial assets at fair value through profit or loss (5,575) (8,495) 0
Loss on valuation of financial assets at fair value through profit or loss 4,513 6,616 0
Valuation and transaction loss (gain) on derivative instruments, net (403,765) (300,500) 1,043,628
Share in loss (profit) of associates and joint ventures, net (166,820) (363,101) 81,688
Gain on disposal of financial assets (3,866) (1,838) (1,130)
Gain on disposal of property plant, and equipment (43,784) (98,077) (48,316)
Gain on disposal of intangible assets (206) (12) (564)
Gain on disposal of investments in associates and joint ventures (70,094) (5,079) (609)
Loss on disposal of investments in associates and joint ventures 2 2,183 0
Impairment loss on investments in associates and joint ventures 22,517 7,907 27,238
Gain on disposal of investments in subsidiaries 0 (72) 0
Loss on disposal of investments in subsidiaries 256 0 0
Interest income (268,118) (223,767) (206,143)
Dividend income (13,838) (12,777) (11,477)
Impairment loss on available-for-sale financial assets 0 0 2,713
Other inflows (outflows) of cash 128,237 81,317 16,679
Adjustments for Cash flows from operating activities 15,769,297 13,129,849 16,492,940
Changes in:      
Trade receivables 95,345 246,755 (218,328)
Non-trade receivables 64,027 154,580 (31,807)
Accrued income 83,589 (484,718) 577,838
Other receivables (116,583) (61,961) (1,271)
Other current assets (271,986) (148,509) 37,576
Inventories (980,216) (1,771,550) (1,373,438)
Other non-current assets (611,066) (54,148) (46,079)
Trade payables (546,159) 478,744 342,126
Non-trade payables 192,506 (292,912) (214,704)
Accrued expenses (454,501) (361,204) (715,305)
Other payables 0 0 292
Other current liabilities 373,403 250,112 (126,323)
Other non-current liabilities 650,468 287,488 763,958
Investments in associates and joint ventures (dividends received) 215,612 175,175 106,983
Provisions (1,473,461) (1,132,969) (1,390,606)
Payments of employee benefit obligations (65,242) (89,253) (69,489)
Plan assets (348,386) (330,064) (325,080)
Changes in assets and liabilities Cash flows from operating activities (3,192,650) (3,134,434) (2,683,657)
Cash generated from operating activities 10,313,112 8,820,917 15,250,677
Dividends received (available-for-sale financial assets) 24,255 11,182 10,590
Interest paid (2,027,850) (1,895,898) (1,886,303)
Interest received 186,122 194,221 173,226
Income taxes paid (282,211) (450,290) (2,298,296)
Net cash flows from operating activities 8,213,428 6,680,132 11,249,894
Cash flows provided by investing activities      
Proceeds from disposals of investments in associates and joint ventures 0 1,617 10,542
Acquisition of investments in associates and joint ventures (107,821) (319,425) (206,753)
Proceeds from sales of property, plant and equipment 522,742 234,138 85,801
Acquisition of property, plant and equipment (14,000,359) (12,266,870) (12,535,958)
Proceeds from sales of intangible assets 7,702 13 1,072
Acquisition of intangible assets (229,426) (110,587) (143,887)
Proceeds from disposals of financial assets 2,783,474 2,419,259 5,296,680
Acquisition of financial assets (2,165,342) (2,841,651) (4,786,717)
Increase in loans (335,773) (188,675) (218,698)
Collection of loans 292,745 100,010 120,967
Increase in deposits (280,637) (299,564) (397,078)
Decrease in deposits 275,314 259,930 110,383
Proceeds from disposals of assets held-for-sale 30,662 18,716 0
Receipt of government grants 21,705 30,416 55,533
Cash outflow from merger (154,311) 0 0
Net cash inflow (outflow) from changes in consolidation scope (2,917) 2,141 0
Other cash inflow (outflow) from investing activities, net (157,116) (53,769) 1,414
Net cash flows used in investing activities (13,499,358) (13,014,301) (12,606,699)
Cash flows provided by financing activities      
Proceeds from (Repayment of) short-term borrowings, Net 188,957 (183,660) 370,328
Proceeds from long-term borrowings and debt securities 13,221,407 14,251,586 10,098,067
Repayment of long-term borrowings and debt securities (7,068,290) (8,095,590) (8,198,882)
Payment of lease liabilities (573,437) (134,454) (122,919)
Settlement of derivative instruments, net 102,146 60,907 33,434
Change in non-controlling interests 17,365 20,113 23,582
Repayment of hybrid bond 0 0 (99,750)
Dividends paid (hybrid bond) (13,385) (17,658) (15,856)
Dividends paid (99,356) (599,391) (1,340,387)
Other cash outflow from financing activities, net 0 (175) (2,023)
Net cash from financing activities 5,775,407 5,301,678 745,594
Net increase (decrease) in cash and cash equivalents before effect of exchange rate fluctuations 489,477 (1,032,491) (611,211)
Effect of exchange rate fluctuations on cash held (37,693) 21,097 (70,403)
Net increase (decrease) in cash and cash equivalents 451,784 (1,011,394) (681,614)
Cash and cash equivalents at January 1 1,358,345 2,369,739 3,051,353
Cash and cash equivalents at December 31 ₩ 1,810,129 ₩ 1,358,345 ₩ 2,369,739