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Consolidated Statements of Cash Flows - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Cash flows from operating activities      
Profit (loss) for the year ₩ (5,229,225) ₩ 2,092,469 ₩ (2,263,535)
Adjustments to reconcile profit (loss) for the year to net cash provided by operating activities:      
Income tax expense (benefit) (1,855,989) 899,064 (1,002,303)
Depreciation 11,772,111 11,377,553 10,971,825
Amortization 166,161 170,466 156,915
Employee benefit expense 511,942 492,288 725,120
Bad debt expense 67,242 50,686 16,629
Interest expense 1,914,457 1,995,425 2,046,811
Loss on disposal of financial assets 1,045 648 2,106
Loss on disposal of property, plant and equipment 92,622 162,725 72,508
Loss on abandonment of property, plant and equipment 207,934 255,346 364,233
Loss on impairment of property, plant and equipment 4,056 80,413 50,034
Loss on impairment of intangible assets 0 3,599 513,609
Loss on disposal of intangible assets 145 392 827
Increase in provisions 2,466,452 1,832,765 2,301,215
Loss (gain) on foreign currency translation, net 997,119 (782,167) 370,309
Gain on valuation of financial assets at fair value through profit or loss (14,338) (12,904) (5,575)
Loss on valuation of financial assets at fair value through profit or loss 5,480 7,396 4,513
Valuation and transaction loss (gain) on derivative instruments, net (907,076) 390,322 (403,765)
Share in profit of associates and joint ventures, net (557,056) (279,124) (166,820)
Gain on disposal of financial assets (7,718) (11,992) (3,866)
Reversal of impairment loss on intangible assets (14) 0 0
Gain on disposal of property, plant and equipment (56,284) (93,195) (43,784)
Gain on disposal of intangible assets (1) (1,556) (206)
Gain on disposal of investments in associates and joint ventures (1,844) (10,165) (70,094)
Loss on disposal of investments in associates and joint ventures 64,119 16 2
Impairment loss on investments in associates and joint ventures 0 1,556 22,517
Loss on disposal of investments in subsidiaries 197 6,610 256
Interest income (221,874) (242,586) (268,118)
Dividend income (10,522) (7,316) (13,838)
Others, net (169,856) 30,411 128,237
Adjustments for Cash flows from operating activities 14,468,510 16,316,676 15,769,297
Changes in working capital:      
Trade receivables (216,734) (107,639) 95,345
Non-trade receivables 869,870 459,524 64,027
Accrued income (17,918) (258,963) 83,589
Other receivables 24,306 (32,536) (116,583)
Other current assets (569,732) (462,125) (271,986)
Inventories (1,738,000) (723,495) (980,216)
Other non-current assets (3,462) (140,017) (611,066)
Trade payables 2,144,561 (262,985) (546,159)
Non-trade payables (571,051) (363,260) 192,506
Accrued expenses (456,992) (222,113) (454,501)
Other current liabilities 379,378 388,163 373,403
Other non-current liabilities 458,007 755,005 650,468
Investments in associates and joint ventures (dividends received) 288,242 237,695 215,612
Provisions (2,426,017) (1,499,436) (1,473,461)
Payments of employee benefit obligations (159,477) (74,848) (65,242)
Plan assets (317,707) (582,275) (348,386)
Changes in working capital (2,312,726) (2,889,305) (3,192,650)
Cash generated from operating activities 6,926,559 15,519,840 10,313,112
Dividends received (financial assets at fair value through other comprehensive income) 10,522 7,316 24,255
Interest paid (1,928,160) (2,081,663) (2,027,850)
Interest received 201,022 215,183 186,122
Income taxes paid (736,757) (452,203) (282,211)
Net cash provided by operating activities 4,473,186 13,208,473 8,213,428
Cash flows from investing activities      
Proceeds from disposals of investments in associates and joint ventures 4,472 5,444 0
Acquisition of investments in associates and joint ventures (673,017) (342,116) (107,821)
Proceeds from disposals of property, plant and equipment 277,998 331,777 522,742
Acquisition of property, plant and equipment (12,668,534) (13,281,294) (14,000,359)
Proceeds from disposals of intangible assets 59 10,871 7,702
Acquisition of intangible assets (113,100) (120,371) (229,426)
Proceeds from disposals of financial assets 7,023,674 8,020,406 2,783,474
Acquisition of financial assets (5,893,404) (9,203,450) (2,165,342)
Increase in loans (223,950) (336,744) (335,773)
Collection of loans 218,704 215,292 292,745
Increase in deposits (222,924) (276,255) (280,637)
Decrease in deposits 166,066 280,941 275,314
Proceeds from disposals of assets held-for-sale 1,148 32,578 30,662
Receipt of government grants 37,920 41,209 21,705
Cash outflow from merger 0 0 (154,311)
Net cash outflow from changes in consolidation scope (63,492) (24,624) (2,917)
Other cash outflow from investing activities, net (225,948) (185,475) (157,116)
Net cash used in investing activities (12,354,328) (14,831,811) (13,499,358)
Cash flows from financing activities      
Proceeds from short-term borrowings, net 1,621,440 345,338 188,957
Proceeds from long-term borrowings and debt securities 17,392,311 10,170,107 13,221,407
Repayment of long-term borrowings and debt securities (9,360,357) (7,976,658) (7,068,290)
Payment of lease liabilities (572,036) (613,977) (573,437)
Settlement of derivative instruments, net 98,068 42,263 102,146
Change in non-controlling interests 90,096 11,554 17,365
Dividends paid (hybrid bond) (13,385) (13,385) (13,385)
Dividends paid (812,159) (81,298) (99,356)
Other cash outflow from financing activities, net (8,901) (3,120) 0
Net cash provided by financing activities 8,435,077 1,880,824 5,775,407
Net increase in cash and cash equivalents before effect of exchange rate fluctuations 553,935 257,486 489,477
Effect of exchange rate fluctuations on cash held 51,719 (38,031) (37,693)
Net increase in cash and cash equivalents 605,654 219,455 451,784
Cash and cash equivalents at January 1 2,029,584 1,810,129 1,358,345
Cash and cash equivalents at December 31 ₩ 2,635,238 ₩ 2,029,584 ₩ 1,810,129