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Cash Generated from Operations (Tables) | 12 Months Ended
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Dec. 31, 2017
Text block1 [abstract] |
Summary of Cash Flows from Operating Activities | Cash flows from operating activities for the years ended December 31, 2015, 2016 and 2017, are as follows:
(In millions of Korean won) |  | 2015 |  |  | 2016 |  |  | 2017 |
1. Profit for the year |  | ￦ | 624,685 |  |  | ￦ | 795,117 |  |  | ￦ | 546,341 |
2. Adjustments to reconcile net income |  |  |  |  |  |  |  |  |  |  |  |
Income tax expense |  |  | 346,146 |  |  |  | 328,314 |  |  |  | 270,656 |
Interest income |  |  | (161,123 | ) |  |  | (130,066 | ) |  |  | (108,639 | )
Interest expense |  |  | 445,814 |  |  |  | 337,219 |  |  |  | 302,464 |
Dividends income |  |  | (11,371 | ) |  |  | (3,926 | ) |  |  | (4,785 | )
Depreciation |  |  | 3,030,821 |  |  |  | 2,821,779 |  |  |  | 2,802,531 |
Amortization of intangible assets |  |  | 609,185 |  |  |  | 599,721 |  |  |  | 635,150 |
Provision for severance benefits |  |  | 217,787 |  |  |  | 217,255 |  |  |  | 218,966 |
Impairment losses on trade receivables |  |  | 161,448 |  |  |  | 92,711 |  |  |  | 45,704 |
Share of net profit or loss of associates and joint ventures |  |  | (5,562 | ) |  |  | (2,547 | ) |  |  | 15,480 |
Loss(gain) on disposal of associates and joint ventures |  |  | (4,848 | ) |  |  | (1,450 | ) |  |  | 979 |
Impairment loss of associates and joint ventures |  |  | — |  |  |  | 17,128 |  |  |  | 3,662 |
Gain on disposal of subsidiaries |  |  | (256,230 | ) |  |  | — |  |  |  | — |
Loss on disposal of property, plant and equipment and investment in properties |  |  | 129,466 |  |  |  | 74,913 |  |  |  | 150,293 |
Loss on disposal of intangible assets |  |  | 33,978 |  |  |  | 7,703 |  |  |  | 4,271 |
Loss on impairment of intangible assets |  |  | 292,345 |  |  |  | 135,264 |  |  |  | 116,095 |
Loss on foreign currency translation |  |  | 164,374 |  |  |  | 109,784 |  |  |  | (213,341 | )
Loss(gain) on valuation of derivatives |  |  | (306,538 | ) |  |  | (117,181 | ) |  |  | 268,094 |
Impairment losses on available-for-sale financial assets |  |  | 1,805 |  |  |  | 966 |  |  |  | 9 |
Gain on disposal of available-for-sale financial assets |  |  | (131,041 | ) |  |  | (22,695 | ) |  |  | (89,598 | )
Others |  |  | 24,140 |  |  |  | 64,863 |  |  |  | (251,193 | )
3. Changes in operating assets and liabilities |  |  |  |  |  |  |  |  |  |  |  |
Decrease(increase) in trade receivables |  |  | 112,674 |  |  |  | 252,196 |  |  |  | (303,340 | )
Increase in other receivables |  |  | (21,749 | ) |  |  | (770,893 | ) |  |  | (346,013 | )
Decrease(increase) in other current assets |  |  | (19,701 | ) |  |  | 48,549 |  |  |  | 11,792 |
Increase in other non-current assets |  |  | (137,532 | ) |  |  | (51,765 | ) |  |  | (43,790 | )
Decrease(increase) in inventories |  |  | (270,343 | ) |  |  | 167,873 |  |  |  | (205,403 | )
Increase(decrease) in trade payables |  |  | 81,295 |  |  |  | (114,838 | ) |  |  | 162,110 |
Increase(decrease) in other payables |  |  | (48,680 | ) |  |  | 705,807 |  |  |  | 214,689 |
Increase(decrease) in other current liabilities |  |  | (9,452 | ) |  |  | 37,798 |  |  |  | 288,553 |
Increase in other non-current liabilities |  |  | 119,836 |  |  |  | 30,762 |  |  |  | 174,618 |
Decrease in provisions |  |  | (8,902 | ) |  |  | (12,583 | ) |  |  | (12,574 | )
Decrease in deferred revenue |  |  | (82,582 | ) |  |  | (69,179 | ) |  |  | (13,086 | )
Increase in plan assets |  |  | (223,194 | ) |  |  | (224,244 | ) |  |  | (203,420 | )
Payment of severance benefits |  |  | (117,691 | ) |  |  | (121,835 | ) |  |  | (118,391 | )
4. Cash generated from operations (1+2+3) |  | ￦ | 4,579,260 |  |  | ￦ | 5,202,520 |  |  |  | 4,318,884 |
Summary of Significant Transactions not Affecting Cash Flows | Significant transactions not affecting cash flows for the years ended December 31, 2015, 2016 and 2017, are as follows:
(In millions of Korean won) |  | 2015 |  |  | 2016 |  |  | 2017 |
Reclassification of the current portion of debentures |  | ￦ | 1,551,300 |  |  | ￦ | 1,617,175 |  |  | ￦ | 1,416,066 |
Reclassification of construction-in-progress to property, plant and equipment |  |  | 2,373,023 |  |  |  | 2,212,324 |  |  |  | 2,686,591 |
Reclassification of accounts payable from property, plant and equipment |  |  | 78,663 |  |  |  | 91,407 |  |  |  | 225,601 |
Reclassification of accounts payable from intangible assets |  |  | (170,870 | ) |  |  | 668,564 |  |  |  | (227,108 | )
Reclassification of payable from defined benefit liability |  |  | 1,675 |  |  |  | 5,746 |  |  |  | 36,209 |
Reclassification of payable from plan assets |  |  | 13,717 |  |  |  | (9,731 | ) |  |  | 43,035 |

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